Surface chemistry is roughly defined as the study of chemical reactions at interfaces between 2 or more chemicals.

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Why is contact angle higher when I let the glass to be dried in silan solution?

I've read in literature that the silanization reaction is completed in a second. However, I realized an interesting thing; after one hour that my cleaned glass beads are deep coated in a silan bottle ...
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1answer
17 views

How to finish silanization process correctly?

I have some 2mm glass beads and I'm doing silanization on them. For doing that, I have a small bottle that I fill 1/3 with glass beads and then pour silan solution on them and shake well. However, ...
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27 views

How does polydimethylsiloxane stick to glass?

Polydimethylsiloxane (PDMS) is the main ingredient in Rain-X, a treatment that adheres to windshields. How does PDMS adhere to class? It can't form covalent Si-O bonds with glass, according to one ...
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1answer
43 views

How to disperse salicylic acid in sodium lauryl sulphate solution? [closed]

Anti-dandruff shampoo contains Salicylic acid as an active ingredient, but when salicylic acid powder comes in contact with a base solution such as sodium laurylsulfate and water (1:3 wt/wt) caking of ...
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19 views

Why did I get different results in two very similar silanization cases?

I silanized two glass surfaces: For the first one, I used Octadecyltrichlorosilane, 95% but since I finished the first bottle, for the second test I got ODTCS 90%. However, the results that I got from ...
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1answer
38 views

How durable is a silanized surface?

I have two questions regarding silanization: 1) How durable is a silanized glass surface? (i.e. How long a silanized surface can be kept without any change in its wettability or contact angle?) 2) ...
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36 views

What is the best material for my particles?

I'm investigating collision of a particle and a water droplet ($v_\mathrm{drop}=1~\mathrm{m/s}$, $v_\mathrm{particle} \approx 8\ \mathrm{m/s}$, $D_\mathrm{d}=2.8\ \mathrm{mm}$, $D_\mathrm{p}=2.0\ ...
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32 views

In silanization, how to clean kerosene from glass surface completely?

I'm doing some silanization experiments using kerosene to dilute the silan solution. For instance I use a mixture of 10% silan in kerosene. However, after several tests I realized that I cannot ...
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1answer
30 views

Why did I get these inconsistent experimental results in silanization?

I used a 50% wt mixture of Tetraethylorthosilicate + Kerosene for silanization of some glass plates with different treatment times (from 1 sec to 35 sec). However, the contact angle(CA) that I got ...
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13 views

How to do pre-treatment on surface and how to clean the glass surface after silanization?

By Silanization, I want to treat surface of some spherical glass beads. Each bead is supposed to be shot in a particle launcher (like a bullet from a gun). I have some detailed question for the ...
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1answer
45 views

Using results of current experiments in silanization, how to achieve a higher contact angle?

I've done several silanization tests with different solutions and here is a brief of my results: DichloroDimethylSilan: Advancing=90, Receding=56 ChloroTrimethylSilan: Adv=91, Rec=70 ...
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1answer
56 views

Three general questions in silanization of a glass surface

For silanization, I put a glass slide horizontally and pour the silan solution on it to cover the glass surface. Then I leave it for a specific time and then wash with water and acetone. I have ...
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29 views

Why we have mass of adsorbent in Freundlich equation?

In Freundlich equation why we have $m$ the mass of adsorbent. I mean it is surface chemistry and on the surface of adsorbent the adsorption takes place so why we have mass of adsorbent in that ...
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1answer
49 views

How to create different levels of hydrophobicity on glass beads surface?

I have some glass beads and I need to create different levels of hydrophobicity on their surfaces (various contact angles). I know that this is possible by 'silanization'. However, I need to know ...
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1answer
48 views

Influence of sodium cyanoborohydride on C=N bonds in DNA bases

I would like to crosslink an amino-modified DNA strand with an APTES monolayer (which also has a $\ce{NH2}$ end group) using a glutaraldehyde linker. After the formation of Schiff base linkages ...
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26 views

Calculation of concentration of component at catalyst surface

I am struggling a bit with an external diffusion problem. I am trying to calculate the concentration at the surface (as well as surface reaction rate) and would like some help or guidance. Here is ...
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2answers
64 views

How do we determine if some metal will undergo passivation under suitable environment?

The passivity of certain metal fall in order: $\ce{Ti->Al->Cr->Be->Mo->Mg->Ni->Co->Fe->Mn->Zn->Cd->Sn->Pb->Cu}$ Can we predict the order of passivation ...
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1answer
79 views

Organic solutions that corrode metals

Most of the common organic solvents are regarded as noncorrosive, but stainless steel can be attacked by formic, acetic, and propanoic acids. Corrosion of stainless steel by organic solvent ...
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3answers
46 views

protecting contact between aluminium and copper wires

The quarters in which I live has both aluminum and copper household wiring. This results in corrosion of the contacts and can lead to sparking, overheating, and even fire. Is there any way to ...
3
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1answer
94 views

Attachment of disulfide (protected) thiolated oligonucleotide on gold surface

What will happen if I incubate a clean gold surface in un-deprotected ($\ce{oligo-C6-S-SH}$) thiolated oligonucleotide solution instead of deprotected ($\ce{oligo-C6-SH}$) solution. I have read clean ...
6
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1answer
95 views

Does phosphoric acid remove stainless steel electropolished layer?

Electropolished stainless steel has a high corrosion resistance due to the oxide film that is created during electropolishing. The film mainly consist of chromium(III) oxide. Phosphoric acid is ...
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125 views

How does the silver nucleate on glass in Tollen's reagent mirroring?

I'm trying to figure out how exactly does the silver start to grow during a mirroring with Tollen's reagent. I've made two pictures to illustrate how i see the nucleation/growth process of silver on ...
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105 views

How to simulate surface tension?

I am trying to create a water drop simulation for measuring hydrophobicity of surface. I don't know how to simulate the contact angle which is related by younges equation to the surface tensions for ...
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1answer
46 views

How to dissolve composite In2O3 with SnO2 without affecting stainless steel?

I found this article, but it was not helpful. The $\ce{In2O3}$ is probably amorphous. $\ce{HNO3}$ and $\ce{HCl}$ do not work. Any ideas?
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How does chromium help stainless steel prevent rusting?

Various sources (such as this one) say that stainless steel is stainless because a passivation layer of an oxide is formed, but I haven't found details on why chromium helps create this passivation ...
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58 views

Basis set in the computational software “Gaussian-03” for studying adsorption of a hydrogen atom on a carbon paste electrode dropcasted with Pt-CNT

What is the basis set in the computational software "Gaussian-03" that can be used to study the interaction of $\ce{H}$-atom with $\ce{Pt-CNT}$ dropcasted electrode? How can we study the energy ...
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1answer
43 views

Infrared spectroscopy of substances on a OHP film

How can we record a IR spectrum of a substance coated on a Over Head Projector (OHP) sheet? instrument has both transmission and ATR modes. IR spectrum is to be recorded for both the OHP sheet as well ...
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11 views

ordering the hydrophilicity of some polymers

I need to compare the hydrophilicity of those materials to compare contact angles of water with those materials' surfaces for surface tension measurement. Materials are: PTFE (Teflon), PVC, PS, PVDF, ...
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1answer
150 views

How surface passivation works?

Surface passivation is done to deal with "dangling bonds" (for example, $\mathrm{SiO_2}$ layer on top of a $\mathrm{Si}$ layer). But isn't the new surface will have dangling bonds on its own at the ...
8
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1answer
410 views

What forces hold ink on paper?

On regular paper, ink is absorbed, while on photopaper ink stays at the surface and dries for a longer time. What forces act in these two different cases? (see also related questions about pencil ...
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1answer
30 views

Oxide surfaces develop a charge in H2O. Do we have any, even vague, handle on how long does an indivdual charge last on avg. before being neutralised?

We often know, from e.g. titration experiments, what the average surface charge density of a surface is. How do these charges vary over both time and space (i.e. dynamics)? I have been unable to find ...
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1answer
2k views

Hardy Schulze law

I have trouble understanding this particular law. It states that: "Greater the valency of the flocculating ion, greater will be its coagulation power". Why does this happen? What is the intuition ...
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1answer
31 views

What is the direction of charge transfer between Aluminum and aliphatic amines physisorbed on top?

Is there dipole formation upon physisorption of an aliphatic amine to an aluminum substrate? What is the charge transfer direction? What if the aluminum substrate is clean, surface oxidized or covered ...
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1answer
338 views

Does adsorption violate thermodynamics?

My textbook reads as follows: "When a gas is adsorbed, the freedom of movement of its molecules become restricted. This amounts to decrease in the entropy of the gas after adsorption, i.e. Entropy ...
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1answer
53 views

How pigments actually function as colorants?

Pigments are insoluble colorants that have no affinity to the substrate. So how can they function as colorants if they "can't stick"? Are pigments always applied together with a "binder"?
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27 views

How to choose a colorant for a given substrate?

I know there are volumes of International Colour Index (homepage, wiki, paper), but I can't really extract from there for example what red colorants are compatible with both silk and polyester, etc. ...
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1answer
685 views

Does the protective layer of Aluminum oxide form on the surface of aluminium alloys (such as Al-Zr) as well?

Aluminum is an ideal element for usage in airports. Unlike Iron, when oxygenating, there is a protective layer formed that does not allow the rest of the Al metal to oxygenate.Does the protective ...
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1answer
16 views

Does STED microscopy allow us to see reactions happening on a substrate

This years nobel prize for chemistry went to nanoscopy using STED as a control mechanism. I have seen the atoms/molecules of a lattice vibrating as shown by Stefan W Hell in a presentation at some ...
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2answers
467 views

Methods for Determining Partial Charges

I want to run classical molecular dynamics simulations of a periodically replicated surface (rutile $\ce{TiO2}$ with grooves). In order to do so, I first need to solve for the partial charges residing ...
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1answer
53 views

Is there way to detect surface area of nanoparticle by electrochemical technique?

I want to know other than SEM is there any other technique or instrument to detect the surface area of particle esp eletrochemical way.
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1answer
275 views

Information depth in x-ray photoelectron spectroscopy (XPS)

What is 'information depth' in XPS and what does determine it? Also how does it depend on the 'take-off angle'?
3
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1answer
26 views

Particle suspension and re-suspension of nano-particles

I am doing a senior project that synthesizes PbS quantum dots and our particles keep crashing out of solution. I was wondering if anyone can give me some advice or information on stabilizing the ...
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1answer
732 views

Why is gold sol used for intra-muscular injection?

In my textbook it is written that gold sol is used for intramuscular injection. But, actually what is its use? Why would people use such a precious element for injection. Can other colloids be used ...
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1answer
60 views

What eco-friendly substance can I use to write and erase on a wall for UV glowing without detection in daylight?

I rent an office and want an alternative to a whiteboard and continual dry-erase marker purchases. I can shut out the light and use the surface under UV lamps only, that's fine. Commonly listed ...
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1answer
129 views

Why does road salt reveal this bus's frame?

Our city sprays brine on the roads in the winter to prevent people from sliding around. It works but it makes it impossible to keep vehicles clean. One thing I've noticed is that the brine sticks to ...
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2answers
1k views

What is the edge of a diamond like?

The chemical structure of a diamond is defined as an endless lattice in which each carbon atom is covalently bonded to four other carbon atoms situated at the four ends of a tetrahedron. But of ...
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2answers
1k views

Thermodynamics (Entropy change) of micellization?

I was reviewing the thermodynamics of micelle formation from the Wikipedia page and this book. I understood most of the arguments but micellization is supposed to be an entropy driven process with a ...
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4answers
3k views

Why is Charcoal such an excellent adsorbent?

Charcoal (also activated charcoal) is known to adsorb a huge variety of substances including a variety of paints, dyes and many different kinds of ions. Moreover, the amount of adsorption at normal ...
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1answer
516 views

How do point defects in a crystal relate to Entropy?

I am interested in Non-Stoichiometry and how it relates to crystal structures; In particular I wish to learn about surfaces of metal oxides. I am aware that point defects in such crystals are a result ...
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1answer
237 views

Consequences of using reagent preserved with sodium azide on gold film

I am running experiments using reagents preserved with 0.1% sodium azide, which are applied to a gold film. Unfortunately, there are very few options for using reagents without sodium azide. I ...