Questions related to Surface Modification
I am finding polymer like PMMA and PC.
It should meet several conditions,
1. Transparent, high transmittance in visible light.
2. Tg is higher than room temperature.
3. Degree of crystallinity is very law.
I have found several qualified copolymer,
but I want to find a qualified polymer that has more simple structure.
Thank you very much.
Grafting is a common method for modifying the polymeric membrane surface to be more anti-fouling.
But, can we use this method for surface modification in pilot and industrial scales membrane fabrication?
Thank you so much for your time.
As we know oxygen rf plasma is rich in terms of O(-) ion density. I want to understand how / what way these negative ions contribute to surface modification of substrate kept on powered electrode. do these negative ions reach to substrate surface and engage themselves in any phenomena or they remain in bulk plasma only ?
I have an alcoholic solution (ethanol) that contains different functional groups. What is the easiest way to graft these functional groups on the surface of the polyethersulfone membrane?
Is it common for surface modification to increase the standard deviation of electrochemical measurements ? I read several articles but did not investigate this issue. I'd like to know if there are any relevant papers or experience ?
I want to understand a process of interaction between atomic oxygen species (777 nm and 845 nm) from oxygen plasma and polymeric surface. Why atomic oxygen species are considered to be the most responsible species for surface etching phenomena ?
I intend to make the zeta potential of activated carbon positive through chemical treatment. What reagent and method should be used?
I don't have clean room and dust equipment in vacuum environment facility. So after doing precision grinding of my RB-SiC ceramic, it gets exposed to the cold atmospheric plasma process via oxygen (O2) fluid flow on the micro-grinding of RB-SiC ceramic at room temperature.
The hard-brittle layer be formed while and holding it to the substrate holder and fixture. And due to this, surface modification layer again forms which are supported as a effective improve the RB-SiC ceramic removal rate with hardness layer under the surface modification process produce C layer, SiO2 layer or Si-C-O compound through physicochemical reaction via oxygen at room temperature (To my knowledge).
How to further removal efficiency the hard-brittle layer?
Please suggest me something. Thanks.
Thank you for sharing and helping,
Jiabin Xu (Jia-bin Xu)
Harbin Institute of Technology (HIT)
School of Mechatronics Engineering
Timestamp/ Time Line: 2022-04-07, Thursday, Night
I have to take part in the Surface Engineering exam in a few days and I do not have enough time to go deep through the lectures. I would be grateful if anyone could introduce any suitable source for surface engineering with an emphasis on surface characterization and surface modification.
After going through a literature survey and some experimental work, I came to know that stabilizing oil-in-oil Pickering emulsions are more challenging task than stabilizing oil-in-water or water-in-oil emulsions.
There are very few (but important) research papers published by some of the researchers around the world for stabilizing oil-in-oil Pickering emulsions by modifying surface properties of solid particles. Hope much more work may be going on in this field.
If we could develop a simple strategy (without or with surface modifications of solids) for stabilizing oil-in-oil Pickering emulsions, it will be helpful for opening doors of new research in the field of colloidal and interfacial science. This will be helpful in developing a new strategy for novel drug delivery systems for pharmaceuticals, etc.
Q. I want opinions from experts and researchers who are working in the field of colloidal and surface science that why stabilizing oil-in-oil Pickering emulsions is not an easy task and how to design strategies/experiments for stabilizing oil-in-oil Pickering emulsions.
I want to reveal the fundamental issue in the grinding of RB-SiC ceramic, numerical calculation and model analysis were conducted to investigate the effect of the composite process on grinding forces and the mechanism of subsurface material removal in the presence of plasma oxidation.
After searching, I found one method described below:
A novel cold atmospheric plasma (CAP), which is based on the precision grinding process in surface technology to modify at room temperature (RT) for grinding with a combination of plasma oxidation surface modification is proposed.
However, we found some problems from the mechanism research:
1. SiF4, as a gas, evaporates;
2. Some objects will remain on the SiC surface, which is difficult to remove its.
Do you have any experience about these methods. If your answer is yes, can you share your experience with us?
Thank you for sharing and helping,
Harbin Institute of Technology
School of Mechatronics Engineering
Timestamp/ Time Line: 2021-12-15, Wednesday, Night
I am trying to etch surface of glass beads through NaOH for creating hydrophobic surface. Although the material is getting etched, it's not hydrophobic or positively charged. Also, the NaOH based etching method is not much predictable either. Are there any methods for creating hydrophobicity and a positive charge condition on glass beads?
normally surface modification of cellulose leads to the reduction in crystallinity index. but in one modification , i got higher crystallinity index. so i couldn't give an interpretation for this result. can you help me?
Hello, I am doing a carbon surface modification with Gold nanoparticles.
from the FTIR below, I know the formation bond of NH3 and for COO , but I would like to know what is the range of thiol bond formation, is this FTIR good or not?
note that I know that the difference between the bare SPE and modified SPE is the increase of current which is measured by Potentiostat.
thanks in advance.
We are trying to carry out surface modification (using alkali treatment) on selected natural fibres for use in cement matrix composites. However, some of our team members proposed using demineralized water for the treatment process in place of the commonly used distilled water. Several literatures have reported the use of distilled water in this process but as of today (29th June, 2021) and as much as I know, I have not seen/read any literature suggesting the use of demineralized water for this particular process.
As you may know, the amino acid can be conjugated to the side chain of acrylamide, usually catalysed by TEMED and light (is it?). Is it a radical reaction?
We try to replicate this conjugation in micro gel bead in microfluidics. I did a preliminary experiment in a blank gel block, simply casting acrylamide-amino acid precursor into a well plate, then treating with TEMED and light. The conjugation get verified by further conjugating a GFP to the amino acid using EDC/NHS (not reacts with acrylamide)
However when I shape the precursor using microfluidics then treat with temed and light, the GFP cannot connect to the bead any more. I tryied different pH considering isoelectric point to induce extra affinity for conjugation, yet still not work. I also tried lengthen light treatment or increase TEMED, still not work. What is the problem and how should I fix it?
I am looking for ways to give orientation to micro-scaled silicon chips and I am thinking of using a 'life jacket' strategy to keep one side always floating and facing upwards. Are there any materials or surface modification techniques (like maybe if we make it super hydrophobic) to achieve this goal?
I am trying to modify glass surface with 1% APTES in Isopropylalcohol (IPA) solution. But after 10 min., clean solution of APTES turns into a turbid solution which has white tiny particles. Have you ever encountered such a problem and how can I keep APTES stable in the solution?
I have synthesis iron oxide nanoparticles need surface modification when introduce TEoS I got silane layer but not Oh group .Since this Oh group is necessary for further introduction of double bond .
I'm trying to coat my silica NP with diamine PEG, so i used GOPTS to add epoxy group on the surface of the NP then i'll add the PEG. I can not found protocol for SiNP coating PEG, most of the study used cover slip for silica modification, Did any one had experience with this modification (silica nanoparticle PEGlytion)?
I'm looking for a cheap material to modify Titania nanoparticles in order to use them in polymer and increase its contact angle.
I wish to deposit a perovskite layer over ETL (SnO2) in order to fabricate the n-i-p planar device and could notice the role of UVO treatment prior to deposition. I was wondering if there any alternative to the UVO treatment (our lab doesn't have one) to enhance wettability, reduce oxygen vacancy and remove surface contaminants from the SnO2 ETL?
I want to disperse amphiphilic POSS nanoparticle in poly(vinyl alcohol)l chitosan solution. how can i do it whit out nanoparticle surface modification? I want to use surfactant for this . which surfactant and how many is suitable?
Hi all researchers,
We have lots of methods for UF membrane surface modification. But as you know every one has some disadvantages that we can not use them in pilot scale and actually we can not industrialize these methods. So, what is the suitable method for this work?
I am trying to load hydrophobic chemical (porphyrin IX kinds) to PLGA nanoparticles.
Also, I want to modificate my PLGA particles with targeting peptides which have Cys in both ends(C-KGGRAKD-C).
Our labs doesn't have any expereince dealing with conjugation of peptides to PLGA particles.
I am studying and finding some artilces but I need advise for my Particle Preparation.
I am searching what chemical reaction that i have to use, and guide protocol.
The paper, Surface Modification of Graphene Nanoplatelets by Organic Acids and Ultrasonic Radiation for Enhance Uremic Toxins Adsorption, only stated the ratio of acid but not the amount, how do I determine the amount needed?
I am working on certain nanoparticles where I need to modify their surface with a polymer by Ligand exhcange approach. I came across many papers describing many different methods but I am really confused which one to pick up and which method can assure that the surface modification has done successfully. For eg. some papers are saying to do ligand exchange by sonication at room temperature while some are explaining by using certain temperatures with magnetic stirring.
Kindly help me in finding the most reliable methods among them.
Thank you :)
I have a a question regarding surface modification of SiO2 chip. The presumption is that vapors of trimethylsilanol (CH3)3SiOH bond with the original hydroxyl terminated surface of the chip and cause wettability issues, not unlike the manufacturing process of hydrophobic sand (Magic Sand). Could someone please advise how would we go about removing these methyl terminating groups from surface and restore the original hydrophilic hydroxyl group termination?Oxygen plasma did not seem to have an effect on improved wettability. Surface is Si₃N₄, SiO₂, aluminium pads.
Thank you for ideas.
I'm looking for a method to attach APBA to a SU-8 surface. Until now, I'm not very successful in the process.
The SU-8 is a 1um film deposited over a surface. I'm trying to immerse the substrate in 80mM of APBA in ethanol.
Can you give me an advice?
PS: Chemical molecules and suppose reaction
I have TiO2 Nps and I have to disperse them in water, but they are not stable. I am trying to use citric acid as modifier to change surface properties of TiO2, but I don't know how and I didn't find a good paper about this.
I appreciate your guidance.
I am doing surface modification of polymer films using plasma in order to improve anti bacterial property.
Thickness of polymer film is 60 micron to 1 mm for different polymers.
I want to test it against E-Coli species.
What are the testing methods suitable to such substrates?
This work is in the direction of developing antimicrobial catheter surfaces.
Thank you in advance.
With kind regards,
2. Sample holder is in contact with the liquid N or the sample holder all are put in the special Cryostat and then all emerced in liquid N by taking into account a gap or apenture to allow bombarding . I KNOW dr Franek on of the most experts in the field ion induced surface modification.....best regards
As we have used different thermal spray techniques to enhance erosion corrosion resistance of boiler tubes? Can be further apply any other technique on coated steel to improve erosion corrosion resistance?
When surface modifying high K ceramic particles like BT, BST or BZT for use in a high k ceramic/polymer composite film, some researchers say they get higher permittivity in the final film when the particles' surfaces are modified with, for example, an acid like gallic acid or phthalic acid. At the same time, other researchers say a low ph causes barium to dissolve from the particles' surfaces and they talk like it is a bad thing and say the ph needs to be kept higher? Who is right?
I am trying to detect the presence of a surface modification I have made on silica microspheres (3um). I can see by zeta potential that there has been a modification but would like to confirm the presence of the functional group. I have tried FTIR but can only see the silica whereas the functional group has a C=O that I would like to detect.
I synthesized the Ferrimagnetic Magnetite Nanocubes according to this method:
I would like to coat a monolayer of this nanoparticle on a glass substrate. Since, the size of this magnetite is in single-domain regime, i found that they could easily attract each other and hard to disperse well in a solution. This retards further surface modification as they easily aggregate. Therefore, it becomes harder to coat them on surface. But I want the Magnetite with single domain but not the superparamagnetism. Does anyone have experience on it? Thank you so much!
I would like to reduce the surface energy of a stainless steel made wire. I prefer to have durable coating as well as the coating resistance towards mechanical touch (not huge loads though, maximum 1 mN onto ~10 µm^2 surface area).
Please shoot some ideas.
i am doing the surface modification of gold nanorods by using chiral molecules like Cysteine, glutathione etc. I simply mixed the gold nanorods with these molecules with strong agitation at different pH. but the gold nanorods aggregate/precipitates in solution rather than staying intact. can anyone help me in this regard that how to solve this problem?
I would like to ask about the best conditions for modification of polydimethylsiloxane sponge surface to introduce hydroxyl groups using air plasma treatment including plasma power, air flow rate and pressure.
I want to prepare a CuI (Copper Iodide) thin film on ITO substrate but found out it is very much hydrophobic as well as difficult to disperse in ethanol, DMF, Hexane. But, in acetonitrile it is completely dissolved. To prepare a thin film by spin -coating technique dispersion of the material is necessary. So, I am thinking about surface engineering by which the hydrophobic surface will turn to hydrlophillic. Then I can disperse in water medium to prepare film.
I want to modify the PDMS surface so that it is hydrophillic. Is the non-chemical based methods like UV/ozone/ plasma treatments better or the chemical methods of silane treatment better?
In order to remove PDMS from SU8 molds I have used Trichloro(1H,1H,2H,2H-perfluorooctyl)silane coated on SU8. I have to bond these PDMS replica to PDMS. But, I think residue silane (which came while peeling off PDMS from SU8) is making the PDMS-PDMS bonding difficult. Is there a way to wash away this residue silane on PDMS?
I would like to know, if there are any experimentally validated mechanistic studies on the non-specific binding of antibodies to surfaces, preferable to SiO2 surfaces. Is the Interaction mostly driven by Electrostatic (ionic) interaction or by hydrophobic interaction? How does the surface modification e.g. the introduction of Amino groups, Carboxylic acid groups or PEG/ PEI moieties influence the non-specific interaction.
From my experience, for most antibodies the electrostatic interaction can be neglected and hydrophobic interactions take the most important part.
It is well known, that PEGylation of e.g. sensor surfaces can suppress non-specific binding of antibodies on surfaces, but how does this work on a molecular level? I found some studies, but they are focused on liquid-liquid interfaces, not solid-liquid interfaces.
I would be very glad if someone could share their experience. Citable work would be great!
I'm attempting to bond bulk gelatin gels to PDMS in the following conformation: □□□ (first and last squares are PDMS, middle square is gelatin; couple of mm in thickness). The application is stretching of gelatin gels. The PDMS is intended to provide a mechanically resilient location for gripping and subsequent stretching (directly gripping the gelatin would simply destroy it).
I'm currently trying out a two step plasma treatment protocol using acrylic acid (Design and Fabrication of Artificial Skin: Chitosan and Gelatin Immobilization on Silicone by Poly Acrylic Acid Graft Using a Plasma Surface Modification Method; Salati et al. 2011) but initial results aren't promising (no bonding at all).
Has anyone got any other experience with achieving a reliable mechanically-resilient bond between PDMS and gelatin? I appreciate that the bond is always going to be a weak point but I'd nevertheless like to test it.
Alternatively, does anyone know of another mechanically resilient gel (comparable to stiff PDMS) that bonds to gelatin relatively easily?
I want to clean the glass surfaces for surface modification analysis, therefore i am exploring various glass cleaning protocols for the maximum possible decontamination. ( Organic, inorganic and oxide complexes)
I looking for nanoporous thin filim of mesoporous silica on SiO2 surface which can adsorb humidity. There should be uniform hexagonal pores in the thin film.
So, please suggest about the type of mesoporous silica and also about the modification procedure.
I prefer a silane with low boiling point as I am going to deposit it in the vapor phase (chemical vapor deposition).
I have tried TMS (Chlorotrimethylsilane) using CVD on Si wafer and I got water contact angle of ~55 which is not suitable for my purpose. I need something less hydrophobic (30-40 degree).
Your answers will be much appreciated.
Free download via link below or please contact me
•Zr-1Nb alloy was treated by plasma immersion Ti ion implantation and deposition.
•A gradient distribution of titanium as well as vacancy type defects were shown.
•Concentration and depth distribution of vacancy type defects was increased with bias.
•The strong interaction of hydrogen with vacancy type defects was demonstrated.
The effect of low energy plasma immersion ion implantation and deposition of titanium on microstructure, defect structure and hydrogen trapping in zirconium alloy Zr-1Nb was studied. Defect structure and distribution were analyzed by Doppler broadening using slow positron beam. The surface microstructure after modification is represented by nanostructured Ti grains with random orientation. The gradient distribution of titanium as well as vacancy type defects were analyzed. The concentration of vacancy type defects is rising with increasing bias voltage. Gas-phase hydrogenation of the Ti-modified Zr-1Nb alloy was performed at 400 °C for 60 min. The strong interaction of hydrogen with vacancy type defects was demonstrated. Two different changes in the defect structure after hydrogenation were observed: when a titanium film is formed on the surface (after deposition at 500 V) hydrogen trapping occurs with the formation of titanium hydride phases, while in the implanted layer (deposition at 1000 and 1500 V) hydrogen is trapped due to interaction with vacancy type defects. The physical basis of Ti diffusion and its influence on the evolution of defect structure after surface modification and hydrogenation were discussed.
I want to prepare a nano-iron particle for surface modification with positively charge or negatively charge.
I try to do the surface modification of multi-wall carbon nanotube with acid nitric (70%), what is the procedure of dilution the acidic solution with DI water in case that functionalized MWCNTs aggregate together and make us able to filter them?
I have a nanoparticle that can be functionalized with amines or carboxyl groups. I would like to "print" the nanoparticle onto a flat polymer surface, only in regions that have been irradiated by a laser. Is there a combination of laser, polymer, and process that would allow me to do this?
For example, one way to bind carboxyl functionalized nanoparticles would be to crosslink it to an amine on the surface of the polymer. Is there a polymer that would expose amine groups after exposure to a laser?
If there are multiple solutions, then a simple and fast solution is preferred.
Could you please to inform me , what is happening for hardness when residual stress occur after surface modification , is it increased or decrease?
I had coated graphene oxide on top of PES membrane. However, after heat treatment of GO-PES membrane in vacuum oven for 12 hours, the coating was removed when I dipped inside DI water. Is it because the PES membrane acted as hydrophobic before coating. If so, then how can I make the surface modification of PES membrane so as to get very good GO coating?
I want to coat metal alloy on PET and PC sheet using Thermal vapor deposition. i have tried number of trials but there is no good adhesion between polymer and metal. So Please suggest your ideas.
I have MF microspheres with a diameter of around 20 micrometers, and I would like to create -OH groups on the surface to increase wettability.
I need to cover a metal surface with a thin layer of a water soluble polymer and this layer should adhere very well and not separate , also no-toxic ... what are the feasible methods?please advise
- Silane solution preparation for hydrophobic coating
- Preferable deposition technique of coating on inorganic surface
One carbon's surface has been modified with potassium hydroxide while the other is plain. Can anyone suggest what is the inference from these graphs. What do the peaks at 2theta = 20 and 25 indicate? Thanks
As far as I know, wax and fatty substances are minor constituents in plant natural fibers which consist of several alcohols. Unfortunately, I didn't accomplish finding certain answers for some of my questions.
1-In spite of the fact that pectin is water soluble but waxes are insoluble, some literature do not separate waxes and pectin and some of them claim that way waxes are one of the constituents of pectin. Is it right? What's the explanation?
2- Does it appear just in form of tyloses filling the pores on bundles, or fill the intercellular space between individual cells accompanying lignin and pectin, or only covering the fiber bundle's surface?
3- According to the literature, Soxhlet process in acetone, benzene, and ethanol, named dewaxing, is applied to remove wax from untreated raw fibers prior to following treatments. Is alkalization process by sodium hydroxide an effective method to remove wax without performing the dewaxing process??
Nowadays as we know , there is different ways for surface modification of dental implants ( sputter deposition,Electrophoretic deposition, laser treatment, coating and etc.)
I was wondering if anyone could answer my question:
what is the priority of sputter deposition in comparision with other techniques such as coating ?
Actually I am working on the effect of surface modification on explosive boiling. Basically I have considered two types of modification- nano dots and nano coatings. I have found nano coatings are less efficient but can't found the exact explanation of it.
We are working on the ATH complex as a anticoagulant material. after production of the complex, we want to remove the unbounded AT and Heparin. for purification of this complex, the Butyle-agarose and DEAE sepharose were used in the reports. Is there another way other than this for remove unreacted AT and Heparin ? I will be appreciative for any help.
with best regards
I want to make a coat my polyurethane slides with a coating that will make them more hydrophobic. I've seen people use fluorosilanes on silicone and glass but wasn't sure if this would translate to polyurethane as well.
I am really interested in polydopamine-based surface modification of materials. This method is impressive since it provides a functionalized surface that is reactive with amine (-NH2) and thiol (-SH) groups. However, there is one point I do not clearly understand that many researchers have used Tris buffer for polymerization of Dopamine while it might react with polydopamine.
Could you give me suggestion about this?
Thank you very much!
For a given temperature it is well believed that black-bodies emit the highest amount of spectral intensity ( Watts per/m2 per frequency interval). However with the modern surface modification technologies it is possible to activate surface plasmon enhanced emission. This emission is partially coherent so that the waves could be interfered each other and exceed the black body limit. Can some one suggest me a reference for this?
Trying to make an ELISPOT protocol based on the old paper.
Want to coat my plate before adding cells of interest, secondary enzyme-linked antibody, chromogenic substrate in agar, etc.
If I just evaporate my solution onto the plate will the antibody stick?
Maybe I should opt for maleimide?
Compared to other polymers like PET, PP etc. LDPE has very poor oxygen diffusion barrier properties. Enhancement of barrier properties in the case of PET / PP is very good just by surface modification / thin barrier film deposition but not getting reduction in OTR values more than approx. 10 - 15 times in the case of LDPE.
If anyone here have done similar work on LDPE films please share your experience. It would be very much helpful for my studies.
Nanofibrillated cellulose (NFC) is used as reinforcement in polymer matrices via its crystalline regions. But because of its very high density of OH groups, it is very hydrophilic biopolymer.