Recent questions in Surface Chemistry

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1 answer 24 views

How can pH affect the stability of a colloidal solution, and what are the methods for controlling the coagulation of colloidal particles at different pH values?

asked 7 hours ago in Surface Chemistry by Chas90R70595 (650 points)

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1 answer 25 views

Here is a problem related to BET theory of multilayer adsorption for a chemistry student to solve:How many layers of nitrogen molecules can be adsorbed on the surface of a given amount of activated carbon if the monolayer coverage is 100 m²/g and the specific surface area of activated carbon is 1500 m²/g according to the BET theory?

asked 23 hours ago in Surface Chemistry by GeriDibble17 (370 points)

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1 answer 21 views

Given a sample of mesoporous silica with a surface area of 500 m²/g, an amount of physisorbed nitrogen of 4.2 µmol/g, and assuming a monolayer coverage of 16.2 µmol/m², calculate the BET surface area of the silica.

asked 1 day ago in Surface Chemistry by TrishaStanto (670 points)

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1 answer 22 views

For a student studying surface chemistry and the adsorption of gases on solid surfaces, a precise problem could be: What is the effect of temperature on the adsorption of nitrogen gas on activated charcoal and how does it change the isotherm?

asked 1 day ago in Surface Chemistry by MavisClawson (510 points)

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1 answer 41 views

Explain the factors affecting the stability of colloidal dispersion and the phenomenon of coagulation with suitable examples.

asked 1 day ago in Surface Chemistry by TereseTalbot (630 points)

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1 answer 34 views

Does surface modification of a polymer affect its stability and adhesion properties when used in biomedical applications?

asked 1 day ago in Surface Chemistry by GMBCarmon086 (530 points)

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1 answer 28 views

Determine the zeta potential of silver nanoparticles using the electrophoretic mobility measured at different pH values ranging from 3 to 9.

asked 1 day ago in Surface Chemistry by ArronY739552 (170 points)

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1 answer 22 views

Determine the maximum monolayer coverage of nitrogen gas on a silver surface in Langmuir units if the partial pressure of nitrogen gas is 2.5 atm at 298 K. The area per molecule of nitrogen adsorbed on the silver surface is known to be 1.55×10^-19 m^2 according to experimental data.

asked 1 day ago in Surface Chemistry by MyrtisHenke2 (430 points)

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1 answer 17 views

Determine the critical micelle concentration of the sodium dodecyl sulfate (SDS) in water by plotting the surface tension of SDS solutions at different concentrations.

asked 1 day ago in Surface Chemistry by Shanice62T06 (470 points)

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1 answer 19 views

Describe the mechanism of Heterogeneous Catalysis taking place in the Haber process for ammonia synthesis and explain the role of the catalyst in the reaction.

asked 1 day ago in Surface Chemistry by ThaliaEsmond (470 points)

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1 answer 29 views

Consider a solution of gas X in contact with a solid surface at a constant temperature. The Langmuir adsorption isotherm for this system is represented by the equation /= _/(1+), where is the partial pressure of gas X, is the volume of the gas, _ is the saturation pressure of the gas, and is the Langmuir adsorption constant. Suppose a student conducts an experiment to investigate the Langmuir adsorption isotherm for gas X on a particular solid surface. They measure the partial pressure of the gas at various volumes and obtain the following results: (mL/g) : 2.0 2.5 3.0 3.5 4.0 (atm) : 0.2 0.4 0.6 0.8 1.0 Using these values, what is the Langmuir adsorption constant, , for the given system?

asked 1 day ago in Surface Chemistry by Sherry18N294 (430 points)

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1 answer 5 views

Consider a sample of aluminum oxide with a surface area of 100 m2/g. The BET model is used to measure the multilayer adsorption of nitrogen gas on the surface of the aluminum oxide. The experimental data obtained at 77 K is as follows:P/Po = 0.001 0.003 0.01 0.03 0.1 0.3 0.5 0.7 0.9 0.99 V(mL/g) = 7.15 23.20 69.15 194.10 587.58 876.59 962.23 1011.18 1049.03 1059.65Determine the BET constant, BET adsorption capacity, and the monolayer adsorption capacity for the aluminum oxide.

asked 1 day ago in Surface Chemistry by Devin51E645 (790 points)

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1 answer 31 views

Can SERS be used as a reliable technique to detect trace amounts of pesticides on food products?

asked 1 day ago in Surface Chemistry by FredricKohle (370 points)

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1 answer 25 views

Calculate the zeta potential of a colloidal particle, given that the particle has a charge of -3.2 × 10^-19 C, a diameter of 250 nm, and is suspended in a solution with a dielectric constant of 78.3.

asked 1 day ago in Surface Chemistry by EllenBurdine (450 points)

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1 answer 21 views

Calculate the surface tension of water at a temperature of 25°C using the capillary rise method, given that the diameter of the capillary tube is 0.8 mm and the rise of water in the tube is 3 cm.

asked 1 day ago in Surface Chemistry by LucioA28194 (570 points)

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1 answer 17 views

Calculate the surface tension of a liquid whose weight is 0.1 N and the length of a wire that floats on the surface of the liquid is 20 cm. The density of the liquid is 1.2 g/cm³.

asked 1 day ago in Surface Chemistry by LynwoodTripp (310 points)

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1 answer 34 views

Calculate the surface area of a solid adsorbent material using BET theory, given that the mass of the adsorbent material is 2.5 g, the area occupied by each adsorbed layer is 15 Å², the number of monolayers formed is 4, and the value of the BET constant is 0.05.

asked 1 day ago in Surface Chemistry by Maryjo09M169 (330 points)

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1 answer 35 views

Calculate the specific surface area of a catalyst using BET theory, given that the quantity of gas physically adsorbed at a certain temperature and pressure is 0.25 moles, the molar volume of the gas is 22.4 L/mol, the weight of the catalyst used is 0.5 g, and the monolayer coverage of the adsorbate is 0.2.

asked 2 days ago in Surface Chemistry by SuzanneSnow1 (450 points)

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1 answer 27 views

Calculate the monolayer capacity and specific surface area of a sample of silica gel using BET theory. The sample was found to have a weight of 2.56 g and a total surface area of 260 m²/g. The gas used for adsorption was nitrogen at a temperature of 77 K and a pressure range of 0.01-0.3 P/P₀. The plot of (P/P₀)/(V₀/V) versus P/P₀ generated a straight line with a slope of 4.2×10⁻³.

asked 2 days ago in Surface Chemistry by KeiraMcLerie (450 points)

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1 answer 34 views

How does changing the surface chemistry of a solid surface affect the adsorption of proteins, and how can this knowledge be applied to improve biomaterials design for medical implants?

asked 2 days ago in Surface Chemistry by Maurine4660 (310 points)

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