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Nanomaterials - Science topic

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Which Nanomaterials and techniques are best for waste water treatment ?
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I believe, rather than asking about nanomaterials, we should ask about the mechanism of treatment of water and/or wastewater by nanoparticles. I hope that everybody read well about the mechanisms of treatment before unknowingly flattering the nanotechnology. The nanoparticles are just materials, and those materials could be used in coagulation, filtration, or adsorption etc. The treatment of water and wastewater is not like other fields of using nanotechnology such as electronic and other industries.
Important to mention that the existence of nanoparticles in water even in trace amounts could be a problematic in the field of water quality management.
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I am a researcher in Microbiology. I am trying to prepare a nano material from hydroxy appetite. Can anyone give me a brief on how to do that?
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Please refer this paper.
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What are the applications of deep learning, especially deep reinforcement learning, in nanotechnology, especially micro- and nanoelectronics? Please answer the question or recommend some articles.
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Deep learning (DL) has many applications in material discovery and design. For example, paper [1] retrieves subwavelength dimensions from solely far-field measurements + address inverse problem (i.e. obtaining a geometry for a desired electromagnetic response). Meanwhile, Paper [2] uses DL for forward and inverse design of nanoantenna. Besides, deep reinforcement learning (DRL) also has applications on quantum [3] and biochips optimization [4].
References
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Which quantum mechanical model is routinely used to understand the property variation in nanomaterials?Explain using examples?
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Dear Nikhil Verma.
You can't even imagine what are nanoparticles and atomic clusters. To know the composition of small particle of matter, its size or the number of atoms/molecules in it is absolutely not enough to know (calculate) its properties. A different way of preparing (obtaining) the same particles can give them completely different properties. You can see this on the example of silver nanoparticles prepared in different ways - relatively pure and with a large number of defects or impurities:
Critical phenomena in particles of mesoscopic size | Request PDF (researchgate.net)
Or, for example, 8-atom silver clusters:
Stabilization of silver clusters in zeolite matrices | Request PDF (researchgate.net)
I think that none of the quantum models will be able to predict that such clusters are far from metallic. Rather, they are semiconductor, and the three observed absorption peaks around 320 nm are the excitation of excitons in such a cluster, but not of plasmons.
Sincerely, Mikhail Dulin.
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I've doped a nanomaterial with an electron donor, the X-band ESR spectra does indicate that there is a change in the line widths of both the spectra along with a slight change in the g-factor values. Does this indicate a change in the electronic environment of the nanomaterial? For example can it be conclude that a charge transfer is taking place? The spectra is attached. The dark yellow spectra is only of the nanomaterial. The orange spectra is after the addition of the electron donor
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Line width in ESR spectra are important in solid state paramagnetic materials.
Please see e.g. J. Phys. Chem. A 2019, 123, 29, 6350–6355.
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I want to encapsulate of nano materials into the CNTs So i want to draw the nanotube inside the CNTs by using materials studio software.Any one can tell me how is it possible.
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@Kaushik Shandilya Thanks alot for your response I will try.
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How about the International Research Awards on Advanced Nanomaterials and Nanotechnology? How to evaluate the award from the perspective of a researcher in the field of nanotechnology
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The International Research Awards on Advanced Nanomaterials and Nanotechnology is an annual event that recognizes the contributions of researchers in the field of nanotechnology. The awards are given to researchers who have made significant contributions to the field of nanotechnology through their research and development efforts (2020 Awards for Advanced Nano Research..........).
The evaluation committee consists of senior scholars from the Nanomaterials Editorial Board. The applications are assessed by the committee and the winners are provided financial support to attend an international conference in the field of nanomaterials (2021 Nanotechnology Awards......).
I hope this helps. Let me know if you have any other questions.
Source:
(3) 2021 Nanotechnology Awards Ceremony - IEEE Nanotechnology Council. https://ieeenano.org/2021/2021-nanotechnology-awards-ceremony.
(4) 3rd Edition of International Research Awards on Advanced Nanomaterials .... https://www.youtube.com/watch?v=ZuaU2RZVaUc.
(5) Advanced Nanomaterials and Nanotechnology - A section of Materials - MDPI. https://www.mdpi.com/journal/materials/sections/adv_nano.
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Let's say I've a host-guest complex. I've two sets of Uv-Vis data, one where the host concentration is constant and the guest is varied and in the other the guest's concentration is constant and the host's concentration is varied. Is it possible to comment about the interaction between the two species from the perspective of d-d transitions?
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Thank you Jürgen Weippert
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Specifically interested in purine derivative as a cation of ionic liquid.
Any relevant reading suggestions are highly appreciated. Thanks.
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Yes, there are several purine-based ionic liquids that have been described in the scientific literature.
Examples of purine-based ionic liquids include 1-butyl-3-methylimidazolium adenosine monophosphate ([BMIM][AMP]), which was first synthesized and characterized in 2011 (reference: "Synthesis and characterization of a new purine-based ionic liquid: 1-butyl-3-methylimidazolium adenosine monophosphate" by L. Zhao et al., in Tetrahedron Letters, vol. 52, p. 1130-1133, 2011).
Other examples of purine-based ionic liquids include 1-butyl-3-methylimidazolium guanosine ([BMIM][GMP]) (reference: "Synthesis and characterization of a novel purine-based ionic liquid: 1-butyl-3 -methylimidazolium guanosine" by L. Zhao et al., in Journal of Molecular Liquids, vol. 170, p. 63-66, 2012) and 1-allyl-3-methylimidazolium hypoxanthine ([AMIM][Hpx]) (reference : "Synthesis and Characterization of a New Purine-Based Ionic Liquid: 1-Allyl-3-methylimidazolium Hypoxanthine" by L. Zhao et al., in Chemical Research in Chinese Universities, vol. 32, p. 157-161, 2016) .
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Magnese ferrite nanomaterials tend to agglomerate very fast, when we synthesize by natural extract
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Use capping agents such as Oleic acid or use some surfactants such as CTAB during synthesis.
Or use charged polymers to prevent agglomeration
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Are their any advantages of using mixture of two solvents rather than one solvent for exfoliation of 2D nanomaterials?
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Thankyou for your answer Kaushik Shandilya.
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It is okay to just deposit the material over the thin films and contact the silver paste. Then illuminate with a particular source of light.
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You have questions, but you dont mention the material you are working to suggest a feasible study and an appropriate answer.
When you work with powders, there is no mechanical cohesion between the powder particles (nanomaterials). There have been a few papers (on UV detectors) which show nanoparticles between two electrodes in colorful pictures. These are computer drawn pictures and do not reveal the reality.
I don't know if they just sprinkle the powders, or use the nano particle in ethanol/acetone, and put a droplet, when the solvent dries up, the particles remain. Mechanical cohesion is not guaranteed in such a method for the current to flow. Moreover for practical applications such methods do not stand a chance for establishing a rigid structure.
Definitely the two parallel electrode contacts must be very close to each other (upto 10-20 microns) which is done by photo-lithography.
However if you have sufficient quantity of your material in nanomaterial powder form, you can press a pellet which is dense enough, cut a small rectangular slab out of it, put contacts on either end, and then do your photoconductivity test to detect incoming radiation.
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I am trying to see if my water filtration membrane is leaching during filtration
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Dear all, please have a look at the following free access paper. My Regards
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I intend to perform mechanical tensile test for my polymer nanocomposites. Does there exists any ASTM standard to follow? Can I also know the dimensions of the specimen to be produced? Lastly, I intend to create a mould for the dog-bone shape. Can we get files online to create the dog-bone mould using 3D printer?
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Yes, there are several ASTM standards available for performing mechanical tensile tests on polymer nanocomposites. Some of the commonly used standards are:
  1. ASTM D638 - Standard Test Method for Tensile Properties of Plastics
  2. ASTM D3039 - Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials
  3. ASTM D882 - Standard Test Method for Tensile Properties of Thin Plastic Sheeting
The dimensions of the specimen depend on the specific ASTM standard chosen for the test. For example, ASTM D638 specifies the dimensions for Type I, II and III specimens. Similarly, ASTM D3039 and ASTM D882 specify the dimensions for different types of specimens.
Regarding the creation of a dog-bone mold using a 3D printer, there are several online resources available that provide files for 3D printing dog-bone molds. Some popular online resources include Thingiverse, GrabCAD, and MyMiniFactory. However, it is important to ensure that the dimensions of the mold are as per the ASTM standards to obtain accurate results.
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Range of humidity parameter for ambient nanomaterials' growth by CVD
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Well, any growth that's negatively affected by incorporation of H and O is affected negatively. O is probably worse than H, but in the end getting rid of it is always good.
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Please contact us if interested in publishing in this Special Issue from Processes (MDPI). Original work and reviews will be considered.
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Hi All,
I work with nanomaterials. Especially with Carbon Dots, with fluorescent properties (Max emission at 650 nm and Max excitation at 400 nm, sizes around 2nm). When we use Confocal Microscope for cell internalization, we get no fluorescence. However, it is possible to detect the shift very clearly in Flow Cytometry. Still, I think I have no choice but the Confocal Microscope to track Carbon Dots inside the cell. (It is not easy to show that these materials are inside the cell in TEM as well). What could be the reason for this situation? does anyone have a similar problem? I need your help. Why can not we detect these nanomaterials by Confocal but we can detect them by Flow Cytometer?
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The robot does not tell the consultant your question if you do not click on his name. See below. Try your suggestion or change the excitation frequency in the microscope if possible.
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What are the biggest technological challenges in the production of core-shell nanomaterials?
Can you please tell your experience and/or give comments on morphology control, synthesis precision, stability and durability, economic viability, etc.
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The production of core-shell nanomaterials presents several technological challenges, some of which include:
  1. Controlling the morphology: The morphology of the core-shell nanomaterials can have a significant impact on their properties and performance. Achieving precise control over the size, shape, and composition of the core and shell is therefore critical for producing high-quality core-shell nanomaterials.
  2. Achieving synthesis precision: Core-shell nanomaterials can be synthesized using a variety of methods, including chemical vapor deposition, electrospinning, and sol-gel synthesis. However, achieving high levels of synthesis precision can be challenging, particularly when it comes to controlling the thickness and composition of the shell.
  3. Ensuring stability and durability: Core-shell nanomaterials can be prone to degradation or instability, particularly if the shell is not able to protect the core from environmental factors such as moisture, heat, or pH fluctuations. Ensuring the stability and durability of core-shell nanomaterials is therefore critical for their long-term performance and viability.
  4. Addressing economic viability: The production of core-shell nanomaterials can be expensive, particularly if large quantities are required. Finding ways to produce core-shell nanomaterials at a reasonable cost is therefore an important challenge for the field.
My experience with core-shell nanomaterials has primarily been in the area of nanocatalysis, where core-shell nanoparticles are used as catalysts in a variety of chemical reactions. In my experience, controlling the size, shape, and composition of the core and shell is critical for achieving high catalytic activity and selectivity. Additionally, ensuring the stability and durability of the nanoparticles is important for maintaining their performance over multiple catalytic cycles.
In terms of economic viability, finding ways to scale up the production of core-shell nanoparticles while maintaining their quality and performance is a major challenge. This often requires the development of new synthesis methods that are cost-effective and scalable, without compromising on the precision and control needed to produce high-quality core-shell nanomaterials.
Overall, the production of core-shell nanomaterials presents several technological challenges, ranging from controlling the morphology and achieving synthesis precision, to ensuring stability and durability and addressing economic viability. Overcoming these challenges will be critical for the widespread adoption and application of core-shell nanomaterials in various fields, including catalysis, energy storage, and biomedicine.
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Question about 2D nanomaterials
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The list of 2D materials is much wider. I would include micas, clay minerals like kaolin, transition metal halides like CrI3. Very high anisotropy is possessed by the so-called. intergrowth materials (otherwise they are also called misfit). Surely this is not a complete list.
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Actually I did not get any sparking during combustion synthesis of nanomaterials.
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Dr. Mandal
I used iron, calcium nitrate salt.
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Please anyone give us what is the significant difference between photocatalysis, electrocatalysis, and photoelectrocatalysis
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What is the catalysis of water? Which reaction?
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I have synthesized a nanocomposite membrane for heavy metals removal like Cr(VI) and Pb(II). I want to perform batch adsorption experiment. Kindly suggest me the appropriate time period for the adsorption of heavy metal using nanocomposite membrane.
Thank you for your time
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You can fix the adsorbent dose and the concentrations of Cr(VI) and Pb(II). You can measure the remaining concentrations of Cr(VI) and Pb(II) after certain time intervals, e.g. 10, 30, 60, 90, 120 min, and so on, until you achieve adsorption equilibrium.
For Cr(VI) you may seek help from the following article.
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Hello, dears,
Do you have any informations about fully funded scientific conferences on the advanced science of Medical Nano-materials?
I have very nice work on the above-mentioned topic, but as per my search on conference links, they ask for payment in order to register. I am a student and I can't able to offer the amount now.
On another side, I don't want to let money limit me from sharing my scientific finding with the entire science world.
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No
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I am looking for a way to draw a daily routine curve (capacity Vs time plot) for a lithium battery test in order to study the effect of the environment on the performance of the battery.
Best regards
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Hi Vadym Chibrikov , thank you for your answer , i will read the paper and try to plot the curve of capacity retention Vs cycle number and see if i can obtain the result i looking for .
and of course i will recommend the paper with pleasure .
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I tried to wrap the material with PEG(Mw=10000) to reduce the nonspecific binding but the effect was not good because of the wrong kind of PEG? So how do I choose?
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To answer this question, let us choose surfactant micelles as a nanomaterial. Surfactant micelles and the cell, together with the cell membrane, are formed by a nonspecific (hydrophobic) interaction. It can be reduced by adding ethyl alcohol or another solvent of dimethylformamide, dimethyl sulfoxide to water. In addition, urea or thiourea can be added.
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Nanomaterials entered the field of research some time ago... and became widespread in the environment in which we live, and entered many industrial fields. Is it safe enough to interfere in the field of health and nutrition?
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Dear Mahmoud A. Mohammad Fakhri, the subject is a matter of continuous debate and contreversies. Similar threads already discussed the subject at RG platform. I have posted many contributions with recent references on the toxicity of nanomaterials. My Regards
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I used particle size analysis for sheet nanomaterials, but which of the size-volume, size-intensity, size-number diagrams is useful? Is it true that in the case of multi-dimensional nanomaterials, if one of the dimensions is nano-sized, that material is considered nano? But particle size analysis only gives one number as average and three graphs reporting size-volume, size-intensity, size-number.
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Zahra Esmaeili Please define what you mean by 'the size of two-dimensional nanomaterials. See attached.
Rémi Rafael Laser diffraction (LD) is a perfectly viable method if used correctly. There are international standards that have long been in existence (e.g. ISO13320). LD is not commonly used in the nano-region where DLS and other techniques are used - in particular, electron microscopy. The paper you refer to is not applicable to the nano region - LD and optical microscopy/image analysis are used. Note that these 2 techniques are not measuring the same thing (ensemble versus single particle, for example) and the data are evaluted in different manners (volume and number, for example).
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Hi everyone
Does anyone have experience in coating nanoparticles on surfaces or read articles on this?
If your answer is positive, I would appreciate it if you could help me.
Indeed, I am looking to coat surfaces using two-dimensional hydrotalcite materials.
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There are many methods which use for coating as above mentioned. It is many depend on Adhesiveness of material. Spine and spray coating are used for viscous material coating.
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I am searching for a conference to submit my paper but many seems fake. kindly suggest me a conference accepting abstracts on nanobased antibacterial materials.
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Following
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I want to deposit a nano-material which starts to degrade at 1000 deg. cel. and completely melts at 1600 deg. cel. I want to use HVOF process for coating, so which torch/gun is suitable ? What should be the process parameters so that particles must not be heated more than 1000 deg. cel. ?
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Hello everyone,
Recently, we received an invitation from the editorial office of "International Journal of nanomaterials, nanotechnology and nanomedicine" as a long-term reviewer and future editorial board.
We want to know the reputation and true level of this magazine, is it a possible rogue magazine?
Thanks for your reply.
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Dear Zhichao Yu ,
The “International Journal of nanomaterials, nanotechnology and nanomedicine” is published by PeerTechZ (https://www.peertechzpublications.com) a publisher mentioned in the Beall’s list of potential predatory publishers (https://beallslist.net ). This is a red flag. But there are more:
-They are not mentioned positive here http://flakyj.blogspot.com/search/label/Peertechz
-There ‘office’ in India is not looking well… like something that corresponds to as they call themselves “one of forerunners in the publishing industry”
-There seems to be a link to OMICS one of the most notorious predatory publishers out there (https://hosting.black/spam-mx-services-peertechz-us-peertechz-omics/ )
So, despite the fact that the website looks misleadingly professional I would say avoid.
Best regards.
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The basic scenario where the graph is exponential and we may extrapolate to obtain the bandgap in eV is suggested in research publications on energy bandgap approximation using Tauc Plot. Which peak, however, should I take into account for extrapolation when there are multiple peaks in a Tauc Plot?
The appropriate figure is included.
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Have a nice time and good day!
Please read these papers, you will find what you want:
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What are the preparation steps for increasing the porosity of nanomaterials
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By mixing with different size materials ( such as in micro)
Sincerely...
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I have done synthesis of a srtio3 by hydrothermal and then calcined the material for crystallization. but after calcination in an alumina crucible the Nano - material has become more harder and is not able to be removed from the crucible. I have done this before also but then I did not face the problem. Now I am unable to remove the material from the crucible as it is harder and stuck in the crucible. Can anyone help me in this regard.
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@Kaushick Parui
Thank you for you your suggestion. But I have tried that too It has become so hard that I couldn't remove it with a spatula too. Is there any other way? As you have asked whether the calcination time and quantity were the same before the time and calcination temperature were the same but the only thing that changed this time was I tried to synthesize double the quantity before.
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Dear all
Hope you are doing well!
What are the best books in Materials Science and Engineering (Basics and Advanced)? Moreover, what are the best skills (or materials topic related) that materials scientists have to develop and to acquire?
Thanks in advance
^_^
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Dear all, following a list of interesting books. My Regards
- Fundamentals of Materials Science and Engineering: An Integrated Approach, William D. Callister, David G. Rethwisch, 5th Edt (2015).
- Materials Science and Engineering: An Introduction, 10e WileyPLUS NextGen Card with Loose-Leaf Print Companion Set, Callister Jr., William D., Rethwisch, David G. 10th Edt (2018).
- The Science and Engineering of Materials, Donald R. Askeland, Wendelin J. Wright. 7th Edt (2014).
- Materials Science and Engineering: A First Course, V. Raghavan, (2004).
- Foundations of Materials Science and Engineering, Willaim Smith, Javed Hashemi, 6th Edt (2019).
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Please tell me advantages of MOFs over other nanomaterials.
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Dear all, it is mainly for the high porosity and ease of preparation and modulation. Please have a look at the following free access document. My Regards
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Dear Researchers
According to the literature, it can be said that PDMS/metal powder composite can demonstrate piezoresistive behavior under the loading condition. PDMS is one of the most expensive polymers in my country. Thus, to find a suitable replacement, silicone resins attracted my attention due to their similar backbone to the PDMS. personally, I couldn't find any related publication regarding silicone resin/metal powder composite. I guess that such behavior has not been studied yet. If you could help me with this, I would appreciate your guidance.
Kind Regards
Milad Razbin
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You're most welcome,
Hope you can get the result you expect.
Bests,
Sara
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Dear Researchers/friends,
I am working on optical properties of nanomaterials and I need to clear my doubts?
Is there anyone who can help?
I shall be thankful enough
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John Bodo A simple Google search on "optical properties of nanomaterials book" will bring up enough reference material to last a lifetime. Hence you need to be much more specific in your needs. Many review articles and papers are also available. Try:
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I have tired sonication and probe sonication in water and EtOH, however I am left with a cloudy suspension with visible grains at the bottom when shaken.
My procedure is measuring 10mg dry nanopowder in 5mL of solvent and sonication of between 30 mins and 1hr.
pipetting the cloudy solution onto a substrate and spincoating shows several grains visible under 50x microscope.
I am unsure if I need a surfactant or stabiliser to proceed or if my nanomaterials may have reaggregated in their container preventing nanodispersion?
Any input or advice is welcome, many thanks.
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as pointed out by John Francis Miller you should first define the goal of dispersing the particles. Beside, primary particle size cannot be measured by light scattering or most other sizing techniques because it is impossible to discriminate primary particles and aggregates. Starting from dry powder it is almost impossible to achieve redispersion of aggregates. As mentioned (for dispersing agglomerates) adjustment of pH, addition of surfactants or phosphates may be useful. You may consider removal of larger aggregates/agglomerates by sedimentation, filtration or other means. Size selective flocculation may help in removing an oversized fraction (the smaller the size the larger dosis of flocculant is necessary).
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There are many reports that conclude that choosing the various anionic sources results in the change in morphology of the metal oxide nanomaterials through the hydrothermal reaction. I would like to understand the science behind this. Can anyone make us clear about what exactly could happen in the growth nucleation when we choose the different anionic source materials?
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hello Kumuthini Rajendran
I recommend you the following paper which is attached below to get you some understanding of different anionic sources impact on the morphology of of the nanomaterials during the hydrothermal process.
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Do you think that nanomaterials play an important role in increasing/decreasing the reynolds number? If so, why?
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Dear Sai P Hariharan, flow regime affects conduction and convection of fluids, whether simple or nano fluids. Please have a look at the attached file. My Regards
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I working in hydrothermal method to synthesize nanomaterials. I have gone through many literatures and video but no one explains mechanism for hydrothermal method.
Please help to explain it.
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I think, it will not be appropriate to conclude that, all hydrothermal synthesis act slow in general. Anyway, I can point out a few reasons:
1. Hydrothermal reaction is preferred over wet chemical (one pot or hot injection techniques) or open air solid state synthesis if the temperature requirement is significantly high or open air environment is prohibited. In hydrothermal, due to closed volume, high pressure is built up, so the threshold temperature for the reaction drops significantly. So, in low temperature and high pressure conditions, the reaction take place. Naturally, to reach the threshold pressure, some time is required and only after that nucleation can occur.
2. The reaction kinetics slow down due to smaller temperature than corresponding one pot or hot injection techniques.
3. In most wet chemical synthesis, continuous (magnetic) stirring is maintained, which speeds up the process and conforms homogeneity. This is absent for hydrothermal reactions.
4. Very often, coating agents are used for surface functionalization in solvothermal reactions. This can further decelerate the growth of seed crystals.
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I am going to use healthy liver cell line for the cytotoxicity experiments with nanomaterials. So, I am wondering that are there any differences between THLE-2 and THLE-3 cell line ?
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I'm using XPS these days to analyze a set of nanomaterials that I am synthesizing. I'm getting familiar with the Avantage data processing tool that is installed on the computer attached to the XPS instrument. For learning the processing tool at my pace, I wanted to know if I can install it on my personal computer. Suggestions will be highly appreciated.
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For proper deconvolution of XPS peaks use origin software. It is free for 7 days trial.
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I know that at nanoscale conductance is quantized and is determined by transmission probability and number of transmission channels (G value). I know that using uncertainty principle we can derive how I/V becomes 2e^2/h. However, I am a little confused by the zero bias and finite bias conductance. Does zero bias conductance mean that even if we do not apply any voltage, current would still flow?
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I can help as per my limited knowledge. You can post your question here, or start a new thread.
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Can I use alternative material instead of lithium chip or lithium foil as a working and reference electrode and assemble two-electrode half cells for analyzing electrochemical performance tests by not using a glove box? When ı read articles related to cell montage, generally, it is mentioned using glove boxes. Is there any alternative? while answering Could you share a reference, please?
Thank you
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Thank you for your answer.
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I am looking for potential collaborators who can work with me on rietveld analysis of few structures with X ray diffraction data, we mainly work of nanomaterials , Photovoltaics , thin films etc but this analysis with be additional support for our work , can reach out at
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I am interested, I am learning Rietveld refinement using fullprof@
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In the field of wastewater treament, if we want to achieve simultaneous adsorption and degradation of organic pollutants(achieve adsorbent materials directly reuse without further treatment), can we only use photocatalysis?
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Besides, the intensity of repulsion and attractive forces developed (physisorption, chemisorption) between the adsorbent-adsorbate molecules/interface, they should also determine the extent of simultaneous adsorption and degradation.
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Antioxidant potential
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Dear all, the most widely used method is known as dpph method. Please have a look at the following documents. My Regards
10.1007/978-1-4419-7347-4_18
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I am a beginner in the synthesis and characterization of metal nanomaterials. I am trying to figure out what information of the nanomaterials can be obtained by UV-Vis spectra.
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Prakash Parajuli To know about the size, morphology, concentration, fraction of spherical to nonspherical nanoparticles, and size distribution of NPs from UV-Vis data, the UV-Vis data (especially the surface plasmon resonance) is fitted with Mie model (for spherical NPs) and Mie-Gans model (for nonspherical NPs). The Mie model is based on the Maxwell equations accounting for the discontinuity of the dielectric constant between the metal sphere and the surrounding medium. It has been successfully applied to free and functionalized metal nanoparticles in various solvents or matrices with diameters in the range 4-25 nm. Despite the differences among samples, an accuracy of about 6% on the nanoparticle's average size with respect to sizes measured by transmission electron microscopy (TEM). Moreover, the fitting model provides other information not available from TEM like the fraction of spherical to nonspherical nanoparticles as well as the concentration and size distribution of NPs in the sample, which is particularly useful for measuring aggregation processes.
In the following video tutorial, I have used two Mathematica codes based on the above two models to calculate various properties associated with the NPS. The codes and other relevant material are provided in the video description. Thanks
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Unlike graphene, it is usually very difficult to exfoliate few layers (~10 nm thick) of hBN on SiO2 substrate due to lip-lip interaction at the edges. Au substrates have been proven very useful to exfoliate TMDs.
Is there any suggestion what kind of substrates can be used to exfoliate few layers of hBN (except SiO2)?
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Using PDMS as transfer stamp would works well to get very thin hBN.
Best!
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  • Emerging technologies such as nanotechnology aim to improve our quality of life and to contribute to industrial competitiveness. The rapid scientific advance and the wide number of new applications for these technologies result in the commercialization and use of consumer products prior to the establishment of an appropriate regulatory context for the adequate management of the potential risks.
  • Nanomaterials, particles with at least one dimension under 100nm in size, behave differently compared to their macro forms, the laws of magnetism change at those sizes, they can enhance the strength of a material is very low concentrations, etc. Hundreds of products are already in the market, e.g., batteries, paints, coatings, cosmetics, medicines, etc. However, these same novel properties may make their risks unpredictable and unknown.
  • The concern about the potential hazards of these materials has been growing exponentially in the last years all over the world; as a result, regulations are arising to guaranty a safe use of nanotechnology. How can we describe the results from such projects by using the several issues that make the development of an appropriate regulatory context extremely difficult and the most important aspects to consider for this task?
  • Key words: nanotoxicology, nanomaterials, regulatory issues, emerging technologies, nanotechnology
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Applications of nanotechnology in various fields are discussed here: https://youtu.be/r0h8Br9rp3g
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I need answer to this.
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Dear Ashok Kumar, the following is depicted from wikipédia:
Nanorods are produced by direct chemical synthesis. A combination of ligands act as shape control agents and bond to different facets of the nanorod with different strengths. This allows different faces of the nanorod to grow at different rates, producing an elongated object.
Additional information in the following documents. My Regards
DOI: 10.5772/intechopen.84550
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Different geometry of unique nanomaterials
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1. We know that nature of bulk materials and nanoscale materials. Bulk material has been large and smaller crystallite size, but nano materials having unique nature. Although nanomaterials exist 10-100 nm range, that’s why different geometry of same nanomaterials have different photo-absorption and harvesting capacity.
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Hello,
I am doing cyclic stability studies using my electrode material for supercapacitor through GCD analysis. I am using three electrode system in 4M KOH. I am getting initial increase in my discharge time (also specific capacitance) from 1 to 120 cycles and then it is getting nearly constant upto 1000 cycles.
I have seen papers which specific capacitance decreasing initially and getting constant but my case is opposite. I am attaching the discharge times for initial few cycles.
Please share your valuable explanations regarding this observation
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Dear Vishnu,
What is your electrode material and the cycling conditions? Did you start cycling direclty after assembling your electrochemical cell?
Because it is quite usual to observe an increase of capacity during the first cycles with inorganic electrode materials, especially for high mass loading electrodes, it is called the activation process. We also observ that in our work ( ).
In more concret words, your electrolyte takes time to penetrate into your electrode, the more it penetrates, the higher the electrode/electrolyte interface and thus the higher the capacity.
I hope it can help you
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Hello all,
I am trying to add silica to the sides of gold nanobipyramids (AuBP) such that only the tips are exposed. I have been following two papers to perform this reaction scheme - (1) "Selective Pd Deposition on Au Nanobipyramids and Pd Site-Dependent Plasmonic Photocatalytic Activity," by Zhu et al and (2) "Oxidation State of Capping Agent Affects Spatial Reactivity on Gold Nanorods," by Hinman et al.
(1) In this paper the group achieved exactly what I am seeking to accomplish (see attached Figure 1). I tried following their procedure (attached Figure 2), but I only get silica nanoparticles/aggregates. Which leads me to
(2) In this paper, the group explains that the oxidation state of PEG-thiol is crucial to the silica forming on the sides of the AuBP (attached Figure 3). Thus I have been using the PEG-disulfide for the reaction as opposed to the PEG-thiol. However, I have not been successful.
One thing that I have considered as a key factor in the pegylation of the AuBP is concentration of the nanoparticles. In paper (1), they do not report the concentration of the AuBP, as this is a difficult number to determine. In paper (2), the group reports the concentration of gold nanorods. However, the surface area of the ends of the gold nanorods is much larger than the surface area of the tips of the AuBP. I tried to roughly calculate the surface area of the tips of the AuBP that I use and then use a comparative concentration of AuBP as compare to the gold nanorods.
Any advice is appreciated! Thank you for your time!
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The organosilane is require, silica has -OH group while gold has thiol. You need a linkage agent, MPTMS for example.
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can nanomaterials react with NMP and because of that no interactions between polymer and nanomaterial?
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Dear Jayaprakash Deenadayalan, at least you should mention the polymer and the nanomaterials under investigation. For NMP, it is a particular solvent among all solvents, in developping special spacial arrengements that imparts and imposes order of structures. Please have a look at the following document. My Regards
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I have synthesized polymer membrane by phase inversion process by adding nanomaterials to it . the mechanical property (tensile strength) decreases instead of increasing by further additiin of nanomaterials
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Dear Jayaprakash Deenadayalan, this is the normal behavior. Please have a look at the following document. My Regards
Kumar, Sanat K.; Ganesan, Venkat; Riggleman, Robert A. (2017). Perspective: Outstanding theoretical questions in polymer-nanoparticle hybrids. The Journal of Chemical Physics, 147(2), 020901–. doi:10.1063/1.4990501
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I have synthesized polymer membrane by phase inversion by adding nanomaterials to it , but the mechanical properties (tensile strength) decreased by further addition of nanomaterials.
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The addition of nanomaterials to polymer-based structures would result in strengthening if the nanomaterials serves as filler to the voids in the structure, or if they serve as crystallization site templates, promoting higher order.
However, there's only a certain amount of nanomaterial that you can add to strengthen a composite. Usually, if it is already in excess amount, instead of promoting strengthening, the nanomaterials would result in the disruption of crystallinity/order in the polymer, thereby weakening the material.
Likewise, the mixing compatibility of the materials as well as their colloidal stability in the chosen solvent should be also considered. Any slight aggregation in the nanomaterial may also result in drastic decrease in the composite's mechanical property. It is recommended to have the composite mixture homogenized first prior to membrane fabrication via phase inversion. you can homogenize through prolonged mixing, or much better if you can access a shear or conditioning mixer.
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. Depending on the material in nm size , this type of analysis can be quite difficult, as some of the nanomaterials ‘react’ in the electron beam (recrystallise, deform, change crystal structure), leading to vastly different results. To the best of my knowledge, this analysis cannot be done on suspended nano-particles in solution, because the TEM requires high vacuum. A drop of the solution might need to be deposited on a copper grid for analysis in the TEM.
It would be in the best to find a collaborating university with access to a good TEM, preferably with a cold finger (liquid N2 cooled), in case the material is sensitive to the above mentioned changes in the beam. Putting the sample in the high vacuum, or drying it, might also already cause changes. Some samples survive freeze drying.
or I can used TEM with CQD in liqiued form
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Walaa Almasri Yes, high energy electron beams can damage polymers and living material. You can use cryo-EM and there are some low(er) powered electron microscopes.
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How do I find a research collaborator in Analytical Chemistry with bias in starch nanomaterials?
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Join hands with me.
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Dear Experts, In order to apply carbon dots (CDs) for the removal of analytes, why do we need to encapsulate these nanodots with other materials? Is it possible to use CDs as a lone adsorbent? Thanks in advance for your valuable comments.
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Considering the fluorescence origin, CDs were encapsulated in silica matrices by reacting a silane precursor with surface hydroxy groups that do not contribute to the emission process. It enables CDs in the uniform dispersion in silica to preserve their narrow emission in the solid state by avoiding aggregation.
To enhance the optical properties, stability and to preserve emissions
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Suppose I want to study the surface profile of a nano-material. Which would be better technique SEM/TEM for investigating surface profile of that nano-material and why? All valuable answers are appreciable.
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I would argue that for surface and nanotechnology that one technique is essential and that is ESCA/XPS or (at a pinch) Auger. Indeed I wouldn't consider working in this area without access to XPS. Differences between SEM and TEM you can find with a simple Google search. If you need to measure crystal plane spacings I'd be using TEM. Otherwise SEM has been perfectly adequate for all of my nanoparticle work. Remember that with microscopy the sample size is tiny and almost certainly isn't representative of the whole...
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Green method to prepare nanomaterials
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Hi you can see this review describes many micro and nanomaterials
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Dear Md. Mahmud ,
The molecular dyes can be substituted by nanometer MAPbIxBr3−x (MA=methylammonium) perovskites. Please for more information please follow the paper:Nanoscale Perovskite-Sensitized Solar Cell Revisited: Dye-Cell or Perovskite-Cell? in the link:
Best wishesd
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I had used an AAO template for the formation of the organic-semiconductor nano-wires by filling the pores of AAO with the molten state semiconductor material. After the formation of organic-semiconductor nano-wires I need to etch-out AAO template parts.
So please give me the suitable etching solution and steps of etching process.
Can anyone give some papers related to this?
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Hi there,
We provide researchers with low-cost mild- and hard- anodized AAO templates, having different pore lengths and diameters. Contact: amirh.montazer@gmail.com
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In our project (glucose sensing) we have a method for CQDs synthesis
Kppa carrageenan + phenylboronic acid----->180°/8h
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Dear Ali,
Hope you are well,
There are innumerable organic precursors which you can synthesize CQDs with, but the real issue is the quality of the prepared CQDs. In the case of sensing you need to prepare CQDs possessing well-defined crystal structure to endow them with a high sensitivity. What is more important is to distinguish CQDs from GQDs!! And this is due to the fact that both CQDs and GQDs are precursor- and synthesis approach-dependent. For example, some researchers believe that using citric acid results in the formation of GQDs and some other say it creates CQDs!!
Thus, I can say "yes you can use Agarose, but what are the advantages compared to Kappa carrageenan?"
Best Regards.
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Nanozyme, is still hot, one question is related to what it is?
Is it a type of artificial enzyme and inspired by nature or is it a real biocatalyst, just as any protein with the function of catalyst, named as enzyme, and ribozymes with the function of catalyst, named as enzyme! Since many of them are made the sole inorganic materials, it might be better to term them as "inorganic enzyme".
I believe many scientists are confused with the term .-nanozyme
My view is clear, nanozyme, just as any other type enzyme-with the Michaelis-Menten kinetics and play a significant role in life processing, is an enzyme, just as protein and RNA! It is not inspired by nature, the characteristics are from their structure, not artificial! The scientist who found nanomaterials with Michaelis-Menten kinetics, just as the scientist who found protein or RNA with Michaelis-Menten kinetics, never creates their catalysis behavior. Why call them artificial with the nice word "inspired by nature". On the other hand, many nanozyme, especially the inorganic nanomaterials with the function "intrinsic peroxidase" or other-intrinsic enzyme activity, might be good to call them "inorganic enzymes" or "biocatalysis".
Please check my work:
Ø Huang Xiao-Lan and Jia-Zhong Zhang, 2012. Hydrolysis of Glucose-6-phosphate in Aged, Acid- Forced Hydrolysed Nanomolar Inorganic Iron Solution — An Inorganic Biocatalyst? RSC Advance, 2:199-208. doi: 10.1039/c1ra00353d
Ø Huang Xiao-Lan, 2018, Hydrolysis of Phosphate Esters Catalyzed by Inorganic Iron Oxide Nanoparticles Acting as Biocatalysts, Astrobiology, 18(3):294-310, doi: 10.1089/ast.2016.1628
Ø Huang Xiao-Lan: 2019, Iron Oxide Nanoparticles: An Inorganic Phosphatase, In: Nanocatalysts, Indrajit Sinha and Madhulata Shukla, IntechOpen, doi: 10.5772/intechopen.82650.
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Nanozymes are nano-materials with enzyme-like characteristics.An artificial enzyme is a synthetic, organic molecule that perform some function of an enzyme
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i have met with an error in gaussian-16 software named 1801,while doing nano material. how can i solve it?
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Hi.. You might have entered unusual keyword while submitting job
Follow the gaussian manual.
Good luck!
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Hello Experts!
Using QuantumATK, I'm trying to investigate the magnetic properties of low-dimensional materials. I looked through a lot of literature on magnetic characteristics and discovered that several researchers used Density Functional Theory to determine the magnetic moment (μB). How can QuantumATK be used to calculate μB? Can someone describe how to calculate μB using QuantumATK?
Thank you so much in advance.
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@Bibek Chettri, you have to just include Mulliken population...in your calculation.. that will give you Total moment of your system and atomic and orbital resolved moment that you can read the output from text representation
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What is the effect of a molecule that contains H2O in its molecular formula on the reaction when dissolved, compared to a molecule that does not contain a molecule of H2O? Does it have an effect on the properties of the nano-material prepared?
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Dear Husham, thanks for asking this interesting technical question which has already received a few helpful answers by experts in the field. Personally I find it a bit difficult to provide you with a qualified answer because in your question you did not specify what you final goal is. If you are working on nanoparticle syntheses, the water content of the precursors may or may not play a role. In any case you need to calculate the amount of your starting material correctly (with or without water). Many nanoparticle syntheses are carried out in aqueous reaction mixtures. In these cases the water content of a starting material does not have any influence on the outcome of the nanoparticle preparation. Only in cases where you are required to work under anhydrous conditions using dry solvents the water content in one of the starting materials can lead to unwanted hydrolysis.
Good luck with your work and best wishes, Frank Edelmann
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Hello, fellow researchers!
Can you all tell me what is SPSS and how to use it in nanotechnology-related research? particularly in catalysis chemistry and functional nanomaterials.
thanks a lot for your guidance and time!
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Hi,
SPSS is a program for statistics. You can use different statistical methods or tests on your data to get statistical relations (ANOVA, t-test, Tukey's test). You can also make the basis for your experimental part/conditions for your experiment via SPSS by orthogonal system.
This was just a short description, please feel free to check also the book by Andy Field: SPSS.
All the best
Patricia
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One of the effective parameters on the properties of nanomaterials is the methods of synthesis of nanoparticles! but I would like to know the effect of the synthesis technique of precipitation of nanomaterials? I appreciated if you please share with me your knowledge of experience in the same.
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There are many alternate nano-conductive materials that can be used for making conductive nanocomposites. The binder of conductive materials will be used in this study is polymers such as PU or epoxy. Thank you in advance.
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Dear Asep Bustanil Aripin I fully agree with the previous answers in that silver provides the best conductivity. In this context please have a look at the following potentially useful article which month help you in your analysis:
Hybrid transparent electrodes of silver nanowires and carbon nanotubes: a low-temperature solution process
Fortunately the paper has been posted as public full text on RG. Thus you can freely download it as pdf file.
Good luck with your work!
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if yes, what is the nature of the interaction between them?
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Dear Komal Grover, better to use the term 'adsorption' than 'immobilization'. In the following review, the mechanism of interaction is discussed. My Regards
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Hi.
We have some carbon nanoparticles and want to check antibacterial activity against drug-resistant bacteria. Before working on drug-tolerant bacteria, Are there any protocols or parameters for checking nanoparticles whether have the antibacterial capability on drug-resistant bacteria?.
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Follow
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Do all the prepared nanomaterials need a washing process, and when do they not? Is the examination of its properties related to the was