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Explore the latest questions and answers in Nanoscience, and find Nanoscience experts.
Questions related to Nanoscience
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Dear ResearchGate community,
I am currently working on the development of plasmonic nanostructures for high-sensibility biosensing. I have a project for fabricating nanostructured plasmonic nanoarrays (using metallic nanodisks or nanowires, Au or Ag) by interference laser lithography that ensures reproducible size and periodicity, but I have not studied the impact of different sizes (thickness and radius of the nanostructures) and periodicity (separation between them) conditions on the enhancement of the optical signal response (intensification of the electric field).
In this context, I think simulations would play a key role in assessing and defining the future optimal fabricating conditions for the mentioned nanoarrays. Thus, I am looking for a collaborator with experience in simulating the optical response of plasmonic nanostructures (in ANSYS or COMSOL). An example of the desired structure is shown in the attached figure. The idea is to collaborate in theoretical/experimental research, where I (main researcher) and other established researchers will carry out the experimental work.
Substantial collaboration will be rewarded with the respective co-authoring in any future paper that implies the direct or indirect use of the simulation results.
If you are interested, do not doubt in contacting me to the following e-mail "sroadaz8@gmail.com" to discuss more details about the systems properties and physical conditions.
Kind regards,
Dr. Simón Roa
Instituto de Nanociencia y Nanotecnología
Centro Atómico Bariloche
Argentina.
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Yes I can utilizes
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I am performing an experiment in which I am taking 35ml 100% ethanol in a small glass tank. I want to reduce this 100% ethanol concentration by a time-dependent chemical reaction. which reaction I can use for this?
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Thanks, @Alan. By 'time' mean I don't want a very fast or quick degradation process. For my experiment I want a slow degradation process of ethanol.
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There is a boatload of articles on Graphene and tube synthesis. However, I don't see a convincing mechanism on why only MWCNT is formed using the arc-plasma technique and not Graphene (single or multi-layer) or SWCNT (when no catalyst is used).
In other words:
Basically, Graphite is evaporated, and then the graphene sheets formed tend to settle in their lowest energy form, so they roll up to form MWCNT. But the explanation of these low energy is also the same for fullerene (or any form of fullerene), isn't it? I recently read an article where researchers used plasma to exfoliate into 1-3 layer graphene. But I was wondering why did this not form MWCNT if MWCNT is more thermodynamically stable?
Your comments, resources and logic are much appreciated!
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In the arc discharge technique you will make all kinds of carbon structures, including amorphous carbon, carbon onions and carbon nanotubes. It is far from only MWCNTs that are being produced. Usually the set-up is tuned in order to favour the formation of MWCNTs, but it is far from the only product that one will find in the collected soot.
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I do not have nanoscience background i read several research paper about biological synthesis of NPs but it was not mention there. Your suggestions will be highly valuable for me.
thanks
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Dear Shalini,
that's a very interesting and important technical question. You can find a large body of relevant literature about the biological ("green") synthesis of a variety of nanoparticles right here on RG. Numerous interesting research papers about this topic have been posted by the authors on RG, many of them even as public full texts. Thus I strongly suggest that you search the "Publications" sections of RG for relevant references. Just search for terms like "green synthesis of nanoparticles" or "annealing of nanoparticles" and the click on "Publications". You will be surprised to see how many helpful papers are directly accessible through RG.
In general, annealing is not a necessary step after nanoparticle synthesis, but it is often employed to achieve well-defined particle size, crystallinity or physical properties.
Good luck with your work and best wishes, Frank Edelmann
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I have read few articles (mostly based on simulations) that show metal nanoparticles bond with graphene or graphene oxide. However, I am thinking about how can metal (i.e. 0 oxidative state which is already in the lowest energy form chemical bonds with graphene (with no functional groups) or graphene oxide (has functional groups). I personally believe that metal nanoparticles are mostly adsorbed (Vanderwall forces) and no chemical bonding can occur. Please let me know your thoughts.
regards
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As XPS/ESCA shows the surface (top 10 - 15 atomic layers) of metals is not in the 0 oxidation state. Oxygen in the atmosphere conspires to have the metal in a higher oxidation state on the surface. In the late 1970’s we showed that even gold on silica matrix was in the +3 oxidation state. Zerovalent elements could only be revealed by Ar ion etching of the top layers. Silver is probably the best example.
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I would like to upload my research paper to the Applied Nanoscience journal. But, I can't find the endnote style for this journal. please any one help me
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Applied Nanoscience
References
Citation
Cite references in the text by name and year in parentheses. Some example: Negotiation research spans many disciplines (Thompson 1990).
Reference list
The list of references should only include works that are cited in the text and that have been published or accepted for publication. Personal communications and unpublished works should only be mentioned in the text.
Reference list entries should be alphabetized by the last names of the first author of each work. Please alphabetize according to the following rules: 1) For one author, by name of author, then chronologically; 2) For two authors, by name of author, then name of coauthor, then chronologically; 3) For more than two authors, by name of first author, then chronologically.
If available, please always include DOIs as full DOI links in your reference list (e.g. “https://doi.org/abc”).
Always use the standard abbreviation of a journal’s name according to the ISSN List of Title Word Abbreviations,
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I'm starting to work with DDSCAT (http://www.astro.princeton.edu/~draine/DDSCAT.html). In the examples there structures standards. But still do not understand how I can create new structures and what software to use it. I need to create a cluster of nanoparticles.
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You may also take a look at options available for ADDA (another DDA code) since the shape formats are compatible. See https://github.com/adda-team/adda/wiki/FAQ#how-to-simulate-light-scattering-by-a-particle-which-shape-can-not-be-described-by-any-of-the-adda-predefined-shapes
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Dear Researchers, I would like to open this discussion, I think it could be interesting and we participants can learn much from each other :
Is it well known that the so called reduced-size effects in Material Science can originate different behaviors in different properties of a given material (this is also known as "Nanomaterials", or "Nanostructured Materials")
Hence the question:
All Nanomaterials have higher Electric Conductivity than its bulk-size respective part ? The logic is that the DOS (Density of States) becomes (theoretically) infinite for some values of Energy in the material (the typical graph of E vs. g(E) for 0D Materials, which distributes this Energy discrete values in peaks, speaking of the shape).
So, this makes me think that for all solid materials; sigma increases (for this values of Energies) when the dimensions of the material decrease.
Regards !:)
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Esteban Diaz-Torres Wow , great explanation.
Thank you my friend !, Yo soy de Monterrey,
Saludos !
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Based on "quality of research" and "remuneration" which country should be chosen for postdoc study.
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Prosper Ovuoraye thank you sir. one of my friends recently went there for postdoc. In this critical pandemic situation also helped him to get there. also there research quality is very good and dynamic. So I recommended it.
Regards
Dr. Vinaya Tari
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Does the downsizing affect the pore size or pore number in the nanoMOFs?
I know that the nanoMOFs retain their crystalline structures as their bulk parents, and for example, if we reduce the size of a bulk MOF to smaller than 10 nm, it's surface area will increase, but for meso MOFs with pore size of 2 nm or more (PCN-224, for example), How will be the porosity? Could be possible to produce such nanoscale meso MOFs?
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This question is informative. Is this question similar to whether downsizing affect bond length and bond angle?
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Dear Colleagues, I hope someone can provide some answer :
I recently had notified by Research Gate that ELSEVIER editorial did notified them that they needed to take one Scientific Article I had on my Research Items down, due to violation of ELSEVIER's Copyright.
This article was published on the Journal "Nano Energy", of ELSEVIER's, and I appear as the first autor.
Is there a way to keep one of this articles on your RG Items without infringing the Copyrights of ELSEVIER ?
Can I try to upload it again? This time under the "Private" mode (not open sharing, but via request)
Or it's better to leave the matter alone? Meaning that all ELSEVIER's editorial articles cannot be shared freely on Research Gate ?
Thank You! Best Regards !
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inerestibg situation, very actually in modern time. answers will be useful to many researchers
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Are there research groups in the UK who have current active interest in Nanogenerators and e.g. links to Beijing Institute on Nano Energy and Nanosystems, Georgiatech in USA or SKKU in Korea?
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Thank you so much for your kind information
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Hi,
Our Australian institute in collaboration with international research groups is working on the development of different platforms for SARS-CoV-2 (Covid-19) vaccines. We are looking for experts in the field to join us by providing technical consultation, sharing their expert views and experiences via email & whatsapp at this stage.
Please contact us via below email / whatsapp for details.
Regards
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Prof. M. R. Mozafari,
Australasian Nanoscience and Nanotechnology Initiative  (ANNI),
Monash University LPO, Clayton, Victoria 3168, Australia.
Tel / Whatsapp:    +61 406284553
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First of all you should start its trials extensively at lab scale (Lab made culture), do its toxicity analysis, make a comprehensive study during its action, in-situ and ex-situ analysis, what kind of toxic substance it will produce during its action, kinetic studies etc.
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Hi,
Our Australian institute in collaboration with international research groups is working on the development of different platforms for SARS-CoV-2 (Covid-19) vaccines. We are looking for experts in the field to join us by providing technical consultation, sharing their expert views and experiences via email & whatsapp at this stage.
Please contact us via below email / whatsapp for details.
Regards
---
Prof. M. R. Mozafari,
Australasian Nanoscience and Nanotechnology Initiative  (ANNI),
Monash University LPO, Clayton, Victoria 3168, Australia.
Tel / Whatsapp:    +61 406284553
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Dear professor Mozafari
It is an interesting idea. Alveolar macrophages as the professional APCs (antigen presenting cells) will be an appropriate target. Nevertheless, the choice of vaccine type as well as optimization of excipients for a successful pulmonary delivery will be challenging. In addition, cytokines secretion induced by the inhaled drugs should be meticulously monitored in the preclinical studies.
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1) mono-(6-ethanediamine-6-deoxy)-β-Cyclodextrin
2) 3 4 9.10 perylene tetracarboxylic acid.
I need them ASAP.
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Hi hari,
You may make an inquiry at Alfa Chemistry, they offer kinds of chemicals for research use.
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Hi, I'm trying a procedure to synthesis nano ZIF-90 in water for specific application, but there is some problem. pxrd pattern for as-synthesized MOF is not completely compatible with charactristic XRD pattern of ZIF-90, in terms of tetha. on the other side, as article indicated, i choose 1 to 40 ratio of zinc acetate to 2-imidazole carboxaldehyde to obtain particles with the scale of 100 nm, but led to really low yield, there is not another way to reach nanosize ZIF-90? I appreciate if anyone has the same experience and could help me.
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Naeimeh Hassanzadeh Goji Anytime. I did not also find the hydrate structure. Maybe it hasn't been reported, yet. You can give it a trial. Good Luck!
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We have planned to procure a nano scribe instrument for our lab and I need to know if it can be placed outside cleanroom or it should be within clean room . If clean room what will be the class? . Please help me in this regard. 
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It is not absolutely necessary. But, I would recommend using it in cleanroom as the structures are small and dust affects them. Also it's largely advantageous for machine health.
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I need the names of the companies or industry which are using nanoscience so that I can try for job
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I have worked on cerium oxide NPs which are colliodal but I have suffered from aggregation so I was doing sonication every time
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The International Conference on Functional Nanomaterials and Nanodevices - Nanomat2020- (www.nanomat-conference.com) will be held on 2-4 September 2020 in Bratislava, Slovakia.
The purpose of this meeting is to bring together students, scientists from around the world with interests in nano/materials, energy storage/conversion, biotechnologies and nano/devices to facilitate the exchange of knowledge and ideas. The official language of the conference is English.
It is our pleasure to invite you to submit your abstract to the International Conference on Functional Nanomaterials and Nanodevices (Nanomat2020). The conference is organized by European Nanoscience and Nanotechnology Association.
For more information, please access: www.nanomat-conference.com
Kindly share to everybody interested! Thank you!
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thanks
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While I am looking for academic positions in Canada, they are constantly asking for a research proposal in NSERC format. I never had an experience of making a proposal in that format.
Hence, I am requesting the research community here in to share their proposals. If you want to share with me only, please send it as a message. I will keep it confidential.
Any sample of proposal (awarded/non-awarded) in that format will be great help for me to fasten up and amend my proposal. I am very much grateful if someone can share their sample proposals.
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Thanks for your message Priya Dharshana.
I am looking for a sample not for a template.
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Polydimethylsiloxane (PDMS) stamp is used for the deterministic placement of 2D materials and the fabrication of van der Waals heterostructures.
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Hi,
I agree with Xuhua Wang . If you want to fab completely in-house with least amount of instruments and cost, you can simply use manually made linear cuts on copper clads/OHP transparency using scalpel blade with whatever geometry you desire and go through soft litho using pdms on them. Feel of the pdms film and you will get the required stamp. With this approach i was able to get structures in the range from sub micron to tens of mm. This technique needs a watch maker's hand and lots of tinkering with the available materials!!!
Regards
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Dear all :
I need help with the following question :
It is possible to grow n-type Bi2Te3 thin films, deposited on glass substrates using the e-beam technique ? If so, What would I require ? or What considerations do a have to take ?
I have acces to an e-beam deposition chamber and I have Intermetallic crucibles (BN-TiB2) and Graphite crucibles.
Then, I have a commercial bulk-Bi2Te3 n-type. So, my plan is to cut a piece of the ingot, and then breake pieces into little pellets, to place them directly into the crucible ,
Will this work ?
Thank you for the help ! :)
Regards !
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You can achieve the result if you use ion-plasma sputtering.
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Can anyone please provide me pdf of this paper.
Interparticle Reactions: An Emerging Direction in Nanomaterials Chemistry
K. R. Krishnadas, Ananya Baksi, Atanu Ghosh, Ganapati Natarajan, Anirban Som, and Thalappil Pradeep* 📷Department of Chemistry, DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE) Indian Institute of Technology Madras, Chennai 600 036, India Acc. Chem. Res., 2017, 50 (8), pp 1988–1996
Thank You
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Dear colleagues:
When you have an Aluminum plate, and then, lets say you sand its surface with a sandpaper, you remove its native Al2O3 thin layer previously formed on the surface.
Instantly, after you remove it ,the Al2O3 quickly grow again, due to the exposure to the Oxygen on the room environment.
Does anyone know What is the Growth Rate of this thin film ? and, What is roughly the film's thickness achieved by this process at a regular room atmosphere?
Thanks all !
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The natural Al2O3 grown on Al is irregular and weak. Its thickness is a few microns (not like Al2O3 grown by electro-chemical process which gives a regular width of 3000-5000 angstroms). The layer is time, humidity and temperature dependent. it grows quickly on the surface within few hours.
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I am making preformed lipid vesicles for use in protein reconstitution and after 5-7 x freeze-thaw cycles with N2l to ~ 10-15C, extrusion through a 0.2 um filter x 10, and extrusion through 2 x 80 nm filters, I get quite a number of Poly's by Cryo-EM imaging. Has anyone found a way to reduce the number of Poly's since this is absolutely critical to my experiments?
Buffer is 20 mM HEPES, pH 7.5, 75 mM NaCl
Extrusion temperature is RT
Extruder is a Lipex 10 ml extruder : 10/1.5mL Thermobarrel and Regular Barrel Extruder from Transferra Nanosciences
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You can experiment with an aqueous solution of ethyl alcohol instead of water to obtain vesicles. With an increase in the alcohol content in water to 0.1 mole fraction, the hydrophobic interaction is enhanced. The addition of urea weakens the hydrophobic interaction.
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I have put this question for the discussion.
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Dear Ashish C. Gandhi ,
the research areas of IoT and Nanotechnology are becoming ever closer together. This creates a special kind of IoT - the Internet of Nano-Things (IoNT) ([1], …,[4]). The use of AI in the "classic" IoT causes Human Cognition to be modeled in the IoT [5]. The result is Intelligent IoT (IIoT). The use of AI in IoNT leads to the genesis of Intelligent IoNT (IIoNT). Artificial intelligence has great significance for Nanotechnology ([6], …, [8]).
It is only to be hoped that we will not speak in the future:
Intelligent Internet of Nanotechnology Threats (IIoNT)
instead of
Intelligent Internet of Nano-Things (IIoNT).
Best regards
Anatol Badach
[1] Mahdi H. Miraz, Maaruf Ali, Peter S. Excell , Richard Picking: "Internet of Nano-Things, Things and Everything: Future Growth Trends"; Future Internet 2018, 10; DOI:10.3390/fi10080068
[2] Ebtesam Almazrouei, Raed M. Shubair, Fabrice Saffre: "Internet of NanoThings: Concepts and Applications"; arXiv:1809.08914v1, Sep 2018
[3] Falko Dressler, Stefan Fischer: Connecting in-body nano communication with body area networks: Challenges and opportunities of the Internet of Nano Things
[4] Fadi Al-Turjman: "Internet of Nano-Things and Wireless Body Area Networks (WBAN)", 2019
[5] Anatol Badach: IIoT – Intelligent IoT (in german), see the figures 8964 and 8965
[6] Pawan Kalyani: "IoT – Internet of Things, Artificial Intelligence and Nano Technology a Perfect Future Blend", Journal of Management Engineering and Information Technology (JMEIT), Vol. 2, Issue- 2, Apr. 2015
[7] ICAIITN 2019 : International Conference on Artificial Intelligence, Internet of Things and Nanotechnology; See: Selected Conference Papers
[8] The convergence of AI and nanotechnology
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Responsivity is a measure of the electrical output per optical input.
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We need more information for above question
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Many documents have pointed out that phosphoric acid is a hard evaporated acid, but in nanofabrication hot phosphoric acid is always used as an etchant. I want to know at high temperature (80-100 C ), if it is still a hard evaporated acid?
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thanks very much
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Mathematical and computational methods are expected to play a major role in nanoscience and nanoengineering. Mathematics and computation can provide effective theory and simulations for analysis and interpretation of experimental results, model-based prediction of nanoscale phenomena, and design and control of nanoscale systems.
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Reminds me of: 'In theory, theory and practice agree. In practice they do not'
I would always believe one well-conducted experiment over one paper with more Greek letters than an Athens post-office.....
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FTIR Spectrum result wavelength range of ZNO nanoparticles.
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M-O bond in FTIR below 600 cm-1
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Graphene Electronics Vs Silicon Electronics !!
Silicon has a band gap of 1.1 eV but graphene is zero band gap semi metal. Therefore graphene has a very less scope in achieving the goal. Further, Doped graphene layer can have certain band gap which can be used in electronic applications similar enough to those using Silicon.
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No.
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Graphene has even been termed as the “miracle material” and is often said to be the new silicon by many. Do we know where we are now on the Gartner hype curve? How far are we from the technology’s broad production, commercialization, and market applicability?
Thank you very much.
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Being somebody on the sideline, reading every once in a while about graphen research, feel as if I read about a similar history as I have experienced. I am active in conductive polymers since the early days of polyacetylene, and I have successfully developed a conductive polymer and technologies based on it which are successful in the market, and during all this time, I had lots of discussions in this research field, cf
As with graphene, conductive polymers had been declared to be "miracle materials" well before anybody had even scratched the surface of understanding these materials, not to talk about a real deep understanding of their chemistry, physics and technology.
Conductive polymers had been declared to be able to do anything you can name, light-weight batteries for cars, polymer LEDs for flat-screen TVs, actuators for robots, sensors for any task you could imagine ...
What has finally emerged as quite small and not too exciting application are transparent antistatic coating (Bayer's PEDOT based on a license granted by me) and my own technologies
- final finishing of printed circuit boards
(competitor's process not based on the Organic Metal Polyaniline)
- and corrosion protection
none of which had been predicted by anybody (including myself), and if so: it would not have excited anybody because "corrosion protection" or "printed circuit boards" (PCB) are not considered being "high-tech" (in spite of that PCBs are part of the core of any high-tech device).
My feeling is that graphene is also on the downhill part of the "hype curve", and I would not be surprised if such applications would finally arise which nobody has ever predicted.
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Sometimes researchers getting new results out from the similar experiments done by other researchers. But, if they propose some new phenomena against the existing one, the scientific community is not easily accepting. So far I observed, people, trusting, following and try to prove the scientific phenomena (physics) proposed by well-known persons in scientific society. If those results not accepted by any high impact journal community, still, it get accepted by a low impact journal community which infer proposed phenomena were not studied properly.
Would you mind to tell what is real science then? What's exact factor decides the quality of scientific phenomena?
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The impact factor of a journal is not always related to the quality of the research published on it. IF is just a librarian's number to assess the number of citations of the journal against their number of papers. Good science and papers will always be found, even in low IF journals (probably up to some threshold level). IF is not a measure of the quality of the paper.
"Real science" as you name it, should always be reproducible, and possible to explain through the simplest explanation (Occam's razor).
Scientific community should never be "easily accepting", that is the main idea of peer review, letters and comments on paper. Scientific community should be all the opposite of easily accepting; and good science should pass the test of the peer review of scientific community.
If I submit a paper, I want it tested under the highest degree of scrutiny. If the paper and its explanations are correct, it must pass all the tests from the scientific community.
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UV Spectrum result wave length range of ZNO nano particles.
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From 250 to 350 nm
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we may faced problem in removing plant extract from silver nano particles. If we check pharmacological activity as such we may not able to discuss the exact mechanism by which these particles show the activity.
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Subha Kandiyar we are washing in order to remove the un-reacted moieties and the loosely bound capping agent. So that the surface of our nano are free for activities
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Thanks in advance.
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thank you so much
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Is it possible to create some nanostructure so as to absorb the entire solar spectrum. If not then What are the major challenges in this field...?
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Black colored metal oxides have the capability to absorb the complete visible and near infra-red light that leads to its efficient application in photocatalysis. Frequently used methods to prepare black TiO2 involve oxidation of low valence Ti compounds, low/high pressure reduction of TiO2 and many more. Black colored metal oxide by hydrogenation offers a cost effective method to improve the visible light activity.
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What are the properties and applications of nanofibres?
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Hi everybody
I do not have access to good reading material on nanotechnology. I need information about different nanomaterials that are currently in use in nanomedicin and biotechnology. I would be grateful if somebody could send me a review article or other literature about it.
Thanks a lot
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Hi Saqid,
You can learn more information about nanomaterials here. I hope it can help you.
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Does anyone know the good parameters of sonicator (times, temp, and power) for good dispersion of cellulose nanofibers in water and modification of MWCNT?
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Hi Paula,
It works well with low concentration (0.1 - 0.2wt%), so would be 0.1g of CNF need 100 or 50 ml of water.
For bacterial cellulose, once it is formed a membrance, it is hard to disperse even at low concentration.
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I am going to assemble a FMR system but I'm having problem in detect the signal from sample as these are of very low amplitudes. Can you please suggest some ways to measure these low varying signals from the noisy environment? Can you suggest other ways than looking for amplifiers as these are very costly?
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I have the same problem, and what‘s worse, the voltage signal I want to detect is generated by alternating electromagnetic field. Do you have any idea. Thank you!
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For force spectroscopy experiments with AFM, it is needed to calibrate the deflection sensitivity and spring constant of the cantilever. First I determine the deflection sensitivity very accurately and then I use the thermal tuning method to determine the spring constant, for which I have to mention the deflection sensitivity correction factor, which I don't know how to determine.
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For people who are still interested in this question:
Simply speaking, you can type 1.106 for a rectangular cantilever and 1.144 for a V-shaped cantilever in deflection sensitivity correction although the default value of your Bruker Nanoscope software might be different from these values. For your reference, you can find the answer of Ben Ohler (the author of the application note that Krishnashish mentioned) at the following website:
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I'm interested in biodegradable polymeric nanoparticles in controlled drug delivery (specifically using biomaterial as osteotropic drug nanocarrier)
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Hi,
Very interesting subject. Please have a look at this 2017 publication:
Osteotropic Nanoscale Drug Delivery System via a Single Aspartic ...
by EJ Carbone - ‎2017
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and 2016 patent:
Bone and metal targeted polymeric nanoparticles (US20150125391 ...
Jul 25, 2016
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Does anyone have any information where we can repair our Nanofactory's AFM holder force sensor. The diamond tip, and its mounting block fell out of its housing. What's kind of resin or epoxy can be used? The bottom or the side of the block can use resin (epoxy) for pasting? How to do calibration after pasting it?
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When You will get any informations about working service of that holders please let me know. 
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Which type of gun/air brush required for this?
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Welcome
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I need to dope TiO2 to study the white LED applications..i request you to do the needful..And also what properties of the material should be focused..??
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Hello,
There is an interesting publication about Doped TiO2. Maybe it helps you because it depends on what are you exactly looking for. 
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How can I measure  dislocation density in the crystal?
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Hello,
High Resolution X-Ray Diffraction with triple-axis geometry can be used to determine faults of crystalline materials . In order to determine dislocation density you will need three rocking curves of single reflections, calculated amplitude of Burgers vector, mosaicity (screw) dislocation angle and peak shape parameters (FWHM, Lorentzian and Gaussian contributions). I applied this technique to thin films but I think you would also find it suitable for your samples.
In the following paper calculations for GaN epitaxial thin films have been described
This paper contains all necessary equations with exhaustive comments. I think they will help you to adapt the methodology to your own samples.
Whit Regards,
Aidin
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I tried with Spin coating and dip coating also. But the distribution is random. It is not at all uniform through out the substrate. 
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Ethanol
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hello, Im working on Luminescent concentrator Solar cell (LSC). I read some paper and they consider about geometric gain ( G value) , following the concept I tried to calculate but cound not find the same value which they said. Who one can show me how to calculate G value?
I attached the paper i read which had G=6
Thank you very much!
Wish you suscess!
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thank you veryfor your supporting but in this case it looks different from your side.
Anyway thank you so much and wish you the best!
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In general, what is the Z-average size for the particle can be considered as nano range? For example, the result I obtain for Particle Size is 10nm. Can it be concluded that my sample is in nano range?
Instrument: Zetasizer Nano-ZS
Brand: Malvern
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Yes, if the z-average size is 10nm it can safely be concluded that your sample is in the nano range. There are different ways to analyze dynamic light scattering data, and the z-average is the easiest overall average size.
However please note, that one has to be careful with the reversal of the statement: If the z-average is larger than 100nm that does not mean that there are no nanoparticles present. For example if the z-average was 600nm it could still be 'covering up' a peak at 50nm which may or may not show in the distribution analysis. In addition, the hydrodynamic size falls between the smallest and the largest dimension of a non-spherical object: a rod-like particle with a dimension of 10nm x 10nm x 900nm may show a z-average above 100nm, yet the particles have at least one dimension in the nano range.
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I want to measure the pore size distribution of gas shale rock in terms of nano scale, I found in the papers they all used helium porosimetry, just want to know why they used helium instead of nitrogen and is it possible if I use nitrogen in my situation?
Thanks for help.
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I am assuming that molecular size limits the pore size you can measure. As long as your sample does not react with nitrogen, I don't see another reason to use helium instead of nitrogen, but I am not really an expert of porosimetry.
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i was analysed prepared CdS quantum dot in UV absorbance spectroscopy for my project work.so ,i got different peaks for different preparation methods of quantum dot. so, can anyone describe about the relationship between absorbance peak of UV analysis and size of CdS quantum dot?...thank u
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Different preparation methods would give you quantum dots of different sizes.
As the quantum dot size increases, the energy gap between the levels decreases, leading to bathochromic shift or red shift (quantum confinement).
Greater the size of the quantum dot, greater is the shift of the lambda max towards the red edge.
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same types of nanoparticles but different some parameters
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thank you so much both Neha Desai and Bilal Taher
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Is it possible that cyclic aromatic peptide self-assemble to form nanofiber? Due to pi pi interaction aromatic peptide form nanofiber, nanotube. But in cyclic form there is restriction in conformation. So is there any possibility to form fiber in cyclic form? 
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The simpler part of your question was not in black and white! The pi-pi interaction alone is not sufficient to lead to self fiber formation of the structure!
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Dear all
  • Would anyone give me a brief and useful review on VASP and Quntum esprsso? I need to know about their performance, speed, parallel computing, free license and tools. Which one is more applicable in solid state physics and comutational nanosciences. Please rank them 0-100.
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VASP is a commercial code and Quantum-Espresso (QE) is an open source code.
Both have their own issues:
1. VASP is faster than QE.
2. QE has a very good mailing support.
3. Being free (under GNU license), QE is accessible to everybody.
4. For calculations of vibrational properties, QE contains implementations of DFPT (Density Functional Perturbations Theory), whereas VASP uses another third party software.
5. There are well-tested pseudpotentions (PP) for VASP, whereas you have to choose proper PP for QE as there are many for the same element.
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We have synthesised Silver and gold nanoparticles from diffrent plant extract by using silver Nitrate and  Aucl4. We preserved our sample by Lyophilization. we want to characterise our sample by SEM & TEM analysis. But we are not sure weather any type of coating is required on Sample for TEM & SEM analysis. Secondly, What are the precautions and conditions we need to follow during transportation of sample from our lab to SEM & TEM lab??   
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We don´t use it.
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The correct term for nanofibres (lets consider TOCN) is dispersion or suspension? 
Both of them are used in the literature, but according to Peng, Gardner&Han (2011) "For dispersion forces (Van der Waals) to occur, the distances among nanofibrils need to be closer than the distances for hydrogen bonds. In a stable CNF suspension, the distances among fibrils are not small enough to form molecular contact"
However, sentences such as these still appear regularly:
"NFC is typically processed as an aqueous dispersion because of its affinity for water"
"CNFs are processed as aqueous suspensions because of their hydrophilic nature..."
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Dear Ana,
As you wrote Yucheng Peng et al. in their publication entitled " Drying cellulose nanofibrils: in search of a suitable method" have introduced in the introduction the description of CNFs by others: Gardner et al. (2008) stated that In most cases, CNFs are processed as aqueous suspensions because of their hydrophilic nature and propensity to agglomerate during drying.  Hiemenz and Rajagopalan (1997) and Lindstrom et al. (2005) stated  for dispersion forces (Van der Waals) to occur, the distances among nanofibrils need to be closer than the distances for hydrogen bonds.
To my understanding the correct term should be suspension (coarse dispersion), since upon drying you get a dry suspension which can be by reconstituted to wet suspension upon the addition of water.
For more on these two terms, please see the text below:
A dispersion is a system in which particles are dispersed in a continuous phase of a different composition (or state). See also emulsion. A dispersion is classified in a number of different ways, including how large the particles are in relation to the particles of the continuous phase, whether or not precipitation occurs, and the presence of Brownian motion.
There are three main types of dispersions:
Coarse dispersion (suspension)
Colloid
Solution
In chemistry, a suspension is a heterogeneous mixture containing solid particles that are sufficiently large for sedimentation. Usually they must be larger than one micrometer. It is when particles are left floating around freely in a solvent. The internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation, with the use of certain excipients or suspending agents. Unlike colloids, suspensions will eventually settle. An example of a suspension would be sand in water. The suspended particles are visible under a microscope and will settle over time if left undisturbed. This distinguishes a suspension from a [colloid] in which the suspended particles are smaller and do not settle.[2] Colloids and suspensions are different from solutions, in which the dissolved substance (solute) does not exist as a solid, and solvent and solute are homogeneously mixed.
A suspension of liquid droplets or fine solid particles in a gas is called an aerosol or particulate. In the atmosphere these consist of fine dust and soot particles, sea salt, biogenicand volcanogenic sulfates, nitrates, and cloud droplets.
Suspensions are classified on the basis of the dispersed phase and the dispersion medium, where the former is essentially solid while the latter may either be a solid, a liquid, or a gas.
References:
Chemistry: Matter and Its Changes, 4th Ed. by Brady, Senese, ISBN 0-471-21517-1
The Columbia Electronic Encyclopedia, 6th ed.
Handbook of Nanostructured Materials and Nanotechnology; Nalwa, H.S., Ed.; Academic Press: New York, NY, USA, 2000; Volume 5, pp. 501-575
Hoping this will be helpful,
Rafik
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Can someone help with the procedure and what column type is needed? Thanks in anticipation. 
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Thanks a lot Tomer. I even found out I could use AAS to measure the free silver in supernatant and i could just subtract from total concentration added initially. I can use your method as a confirmatory method too.
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I am very curious to know the reason of above question. Although it is mentioned in literature that it happens because of 'melting and evaporation' of molten metals and 'action and reaction' of it with dielectric, but still it is not clear to me.
Another point is, if the black deposition on tool and workpiece as well as floating dark colored dielectric near discharge zone is a result of carbon contains in the tool and workpiece materials, then why does it appears in copper and brass even more than it appears in carbon based material such as steel?
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Thank you very much. I am convinced.
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Actually i found that with Zr doping in TiO2, particle size decreases but d spacing increases.
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Dear Inderjeet Singh
Good day
I forgot to tell you that I could overcome a similar situation. I found the (d) values increased but the crystallite size decreased. The attached paper treat this concerning issue. It may help you.
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This question is for get to know contribution of nano science to produce quality composites like modification and treatment techniques.I hope and please do the needful.Thank You.
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To get finer and uniforming distribution of second phase nano particles in the matrix. improvement in properties as well as to attain isotropic condition.
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As the size of the metal nanoparticles (Ag or Au) increases scattering efficiency will increase. When the particle size go beyond a particular value, scattering efficiency star to decrease. In most of the reports, this phenomenon is explained  due to the formation of multipole excitation modes in large size nanoparticles.
[Ref: Ashraf U, Xiaohan Y. Surface Plasmonic Effects on Organic Solar Cells. J. Nanosci. Nanotechnol. 2014, 14: 1099–1119.
Could you please give an explanation for this?
]
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Check this explanations out 
and 
These papers claim it is the nature of the spherical bessel functions and henkel functions in the expression for the scattering cross sections  . Hope this helps.
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Some says direct and indirect transitions from the evident of Tauc's relation. But, it is suitable for thin film or coated a sample on any of the particular substrate analysis. Meanwhile, if some doing UV-DRS or dispersed by solvent how the Tauc's relation supports to find Eg value. Kindly let me know if anybody knows. 
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In principle you can use the Tauc equation in the same way to estimate the onset of the absorption via the Tauc method. The only requirements would be that your solvent is transparent in the wavelength regime of interest. However be very careful how to interpret the Tauc data in thin films, as interference structures will dominate the transparent regime. In this case always perform T and R measurements and use T+R in the Tauc equation. For nanoparticle suspensions you also have to do Transmission measurements with an integrating sphere as otherwise you will interprete scattering as "absorption" which will lead to wrong "band gaps". always keep in mind that the Tauc plot gives you the onset of light loss in a transmission measurement. This is only equivalent to the bandgap in very specific cases (e.g. amorphous material as outlined in the original Tauc paper). The second issue with suspensions is that the dynamic range of the spectrophotometer will determine if you can pick up weak absorptions in small NP concentrations, so one should add concentration dependent studies to determine if the structure you see is that of the fundamental absorption or higher transitions.
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Also tell how much volume of liquid should be used to redisperese them. How much amount of sample should be taken to redispere in liquid.  Kindly give a detailed reply
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You should strictly disperse them under conditions expected for further use, e.g. it does not make sense to disperse them in a special solvent if its application is in water buffered to a fixed pH value and defined electrolyte content.
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i am preparing it since a year but from last week i am facing this problem, is there anyone who can help me in this matter?
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As stated above, the only way to obtain a dry GQDs sample is to freeze dry it. GQDs' high solubility in water makes it difficult to dry normally.
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How to calculate the number of nanosheets in a fixed volume of aqueous colloidal solution with known concentration. Any research paper suggestion?
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1. Use TEM to estimate the NS dimensions
2. Estimate/find the density of the material to give you mass per nanosheet.
3. Provided that the solution is pure (only nanosheets and water), dry a known volume of the dispersion extensively and weight.
4. Divide the total mass by the mass of a single nanosheet.
NB. If there is a organic capping agent, you will need to use TGA to estimate the mass fraction of this component.
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I am interested for M.Sc. Chemical Engineering with Specialization in Nanotechnology from United States of America. Kindly suggest me Research Thesis Topics for M.Sc. Chemical Engineering (Nanotechnology).
Thanks
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As Chemical Engineer try to scale up some simple and not expensive nanoparticles production process, it is very tricky... Like graphene oxide, nano iron oxide, Perovskite nanoparticles.. Nanoparticle production that we conduct in the 0.1 g scale is tricky to be conducted in 1kg scale, and more problems when You go to tons...
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i am preparing nanoparticles, drug is hydrophilic and entrapment efficiency is very low. If i find the drug release by dividing with the total drug taken its giving very low drug release so is it possible to find drug release by dividing with the total drug entrapped? Kindly send if there is any reference for it. 
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Along with all previous answers... consider correction factor every time if your are doing replenishment of your disso medium.
All drug may not be entrapped in carrier system during NP preparation hence its mandatory to find how much drug exactly incorporated in NP against total amount of drug added by you in preparation.
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Nano-electrodes, controlled bio-molecules, programmed reaction metabolism
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Depending on the targets of measurements
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By using biosynthesis how we will get pure CO (cobalt) metals.If anybody is doing this synthesis please give some suggestions. I took cobalt chloride as the source and for (stabilizers), I am using bio extracts.
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Neem Extract, Henna Extract and Guava extract Sir
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PMMA, PBMMA, LSC (luminescent solar concentrator)
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You could apply a thin layer of water soluble film between your PMMA and the substrate. PVOH is a good choice. After dissolving away the PVOH layer, the PMMA above will be self-standing.
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What is the impact of nano Fertilizers on health and environment? 
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Hello, i want to get glass nano beads, can anyone give information from where i can purchase it especially in china?
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If you are just after SiO2 nanobeads ie. less than 500nm in diameter, you can easily make them using the Stober method. After a couple of attempts you should be able to produce decent quantitiy materials equal or greater in quality to those that can be purchased. I have never found purchased nanoparticles to live up to their claimed size and monodispersity, but times may have changed. TEOS, ammonia, alcohol and water is all you need.
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To see the dispersion of the particles deposited on carbon paper/cloth
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I tried to make TEM grids with carbon paper, but it seemed doesn't work, no matter with granted carbon paper dispersed in ethanol or peeled off powder from CP directly.
Now I am thinking  another method, if I succeed you will be informed. I appreciated if you give messages when you manage to do this.
Good luck to me!
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Graph approaches to the diverse and multidisciplinary field of nanoscience. Looking for introductory material. Please share books, articles, theses etc. related to it. I know it can be done but no idea where to start.
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I don't have a complete idea of this field, but I think that a lot of physicals theoreticals studies has been published in nanomaterials like in  Graphene and Quantum dots (CdS, CdSe and PbS). Just take a look in bibliografy.
My best regards
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I would be pleased if anyone help me out introducing a set up in order to observe the nano pores.The attached pictures are shown the surface ( A4 ) and cross section ( C8-3 ). What is the problem? This is my Set up : Sulfuric acid 190 g/lit, Current density  4 A/dm2, Temperature -2 C, Hardness 615 Hv ? Is the issue by my type of study or it itself made this problem?
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Dear Javad,
welcome to the Al anodization world! It is good that you have attached a couple of pictures. This will make everything easier to comment.
I see two different pictures: a top view (top image, right?) and a cross section (bottom image, right?).
Regarding the top-view image, the first thing I would advise is to have a higher magnification. According to the scale bar of the images, you will hardly see any nanopores of sulfuric acid range. Try to go to magnifications of 50-60 kx. As well, you have a very high roughness, polishing the Al prior to anodization would provide a smooth surface where you could see the nanopores more easily.
With regard to the cross section image, I see some shadowy lines across the image that are quite parallel. These may actually be the cross section of your pores. The main problem I see in this latter image is that you have a very blurry image, you should try to correct the agtismatism better next time. As well a higher magnification would make it easier to see the pores, take into account that you try to see nanopores. Nevertheless, from the image scale bar, I would say that your pores are <100 nm, but I wouldn't rely on that unless I had a clear SEM photo.
Finally, I will just comment that the aluminium oxide generated from the anodization is non-conductive, so, if you hadn't, try to deposit 30 nm of Au prior to imaging. This will provide a conductive layer and will make everything much easier to focus.
I hope that this helped you with your research.
Kind regards,
Dr. G. Macias
PD: in order to know more or less the size of your pores write down the developed voltage and multiply it by 2.51 (for mild anodization) or by 2 (for hard anodization). This will provide the average interpore distance and will help you determining if you are looking at the appropriate magnification.
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Thank you.
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No. You will place your nanoparticles in dialysis membrane available