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

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Are there equal bond energies for surface and bulk atoms in nanoparticles?

In nano-particles, surface atoms have fewer neighboring atoms in compare to bulk atoms. Is there any difference between bond energy of surface atoms and bulk atoms?
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123 views

Explain why alumina-containing zeolites possess chemically active surfaces

I think zeolites possess acid sites that are catalytically active in many hydrocarbon reactions. The pore system only allows molecules that are small enough to enter, hence it affects the selectivity ...
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38 views

Chromatography: Why does the insoluble compound get pulled along?

In paper chromatography, we see that a paper with an ink spot on it get dissolved in the liquid and travels up with water due to capillary action. Then the compounds with more affinity to the paper ...
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48 views

Does glass adsorb methanol to an exceptional extent?

Does (borosilicate) glass adsorb methanol to an exceptional extent? We are doing vapor density measurements of organic solvents using a microbalance and a sealed glass sphere. Other polar molecules ...
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31 views

How does one remove iron carbides from a heavily carburized steel surface?

How does one remove iron carbides from a heavily carburized steel surface so what is left is a porous surface comprised of mostly low carbon steel? I belive $\ce{BCl3}$ might work, but I don't have ...
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83 views

Why does a silanized glass surface become hydrophobic?

What is the physical reason that a glass surface becomes hydrophobic by silanization? (e.g. is it due to increase in surface roughness due to the long chains which is created on the glass surface? or ....
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Why even the most volatile solvents leave a residue after evaporating?

After a solvent evaporates off of a surface there's always some residue left in the form of a strain. Why it is the case even for highly volatile solvents such as acetone, toluene etc?
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Wetting properties of FTO coated glass

I am trying to spin coat a layer of polymer+Quantum Dots on an FTO coated glass slide. My material is forming agglomerates at the edges of my slide. My polymer is PVK which has a conc of$\approx 4.5mg/...
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381 views

Why is adsorption exothermic

Why is adsorption exothermic? The explanation given in my textbook is: It basically says adsorption is exothermic because $\Delta G$ has to be negative. Isn't there any other reason?
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Where does the charge on an electrode, responsible for the formation of a double layer once submerged in an electrolyte, come from?

I've started exploring electrical double layers and electrode-tissue interfaces whilst dealing with deep brain stimulation and stimulus artefact. I've heard many times that what causes the double ...
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45 views

Poly(3-hexyltiophene-2,5-diyl) (P3HT) reactions with inorganic salts in aqueous solution

I would need for my research at least as a starting point to know what kind of reactions occur at the interface of P3HT and an electrolyte. The electrolyte is simple KCl solution, maybe with HCl/KOH ...
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Surface stability in crystal growth

What is the meaning of "more thermodynamically stable surface" when we speak of crystallographic facet formation? For example in wurtzite crystals, the formation of (10-11) surfaces are more favorable ...
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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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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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61 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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58 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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32 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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46 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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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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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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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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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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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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184 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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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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83 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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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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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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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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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 mixtures,...
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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 ...
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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 ...
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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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255 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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163 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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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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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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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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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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345 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 ...
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733 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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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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5k 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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43 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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515 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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61 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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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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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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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 ...