Recent questions in Surface Chemistry

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1 answer 78 views

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

asked Feb 4 in Surface Chemistry by SarahWeston5 (2.0k points)

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1 answer 84 views

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

asked Feb 4 in Surface Chemistry by ThedaP243851 (2.4k points)

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1 answer 71 views

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

asked Feb 4 in Surface Chemistry by MartyKindler (1.5k points)

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1 answer 73 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 Feb 4 in Surface Chemistry by EvieOconnor (2.3k points)

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1 answer 55 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 Feb 4 in Surface Chemistry by ElviaU45322 (2.2k points)

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1 answer 81 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 Feb 3 in Surface Chemistry by SZVRamon1645 (2.4k points)

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1 answer 72 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 Feb 3 in Surface Chemistry by ArleneLeichh (2.1k points)

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1 answer 38 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 Feb 3 in Surface Chemistry by JedShackell5 (1.8k points)

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1 answer 125 views

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

asked Feb 3 in Surface Chemistry by RobertBousqu (1.5k points)

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1 answer 59 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 Feb 3 in Surface Chemistry by ClaritaTrive (2.4k points)

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1 answer 73 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 Feb 3 in Surface Chemistry by HenryCharles (2.0k points)

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1 answer 51 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 Feb 3 in Surface Chemistry by MaribelLeepe (1.7k points)

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1 answer 118 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 Feb 3 in Surface Chemistry by VioletteM27 (2.1k points)

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1 answer 76 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 Feb 3 in Surface Chemistry by Vance58E9387 (1.9k points)

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1 answer 70 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 Feb 3 in Surface Chemistry by OrenDarwin6 (1.9k points)

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1 answer 75 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 Feb 3 in Surface Chemistry by WillieAlgera (1.5k points)

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1 answer 72 views

How does changing the length of the hydrocarbon chain in a surfactant affect its ability to reduce surface tension?

asked Feb 3 in Surface Chemistry by JEAMolly3713 (2.3k points)

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1 answer 146 views

How do changes in surface properties of food contact materials, such as metals or polymers, affect the adhesion and removal of microorganisms during food and beverage processing?

asked Jan 31 in Surface Chemistry by EleanorNabor (1.9k points)

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1 answer 142 views

How do changes in pH affect the surface properties of biomembranes?

asked Jan 31 in Surface Chemistry by LatashaWillc (2.7k points)

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1 answer 91 views

How do changes in pH affect the surface properties of biomembranes and how can this knowledge be applied in drug delivery systems?

asked Jan 31 in Surface Chemistry by YvonneRausch (2.0k points)

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