Recent questions in Surface Chemistry

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What is the surface area of a sample of activated carbon with a BET (Brunauer-Emmett-Teller) surface area of 500 m²/g, if 5 g of the sample is used in the experiment?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the thickness of a monolayer of gas adsorbed on the surface of a solid using the BET theory if the specific surface area of the solid is 100 m²/g and the volume of gas adsorbed at standard pressure is 10 mL/g?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the surface area of a powdered sample of activated carbon if the amount of nitrogen gas adsorbed at -196°C is 25.6 mL/g and the cross-sectional area of nitrogen molecule is 16.2 Å²?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the surface area of a sample of activated charcoal if the BET plot data at a nitrogen pressure of 0.98 atm gives a monolayer capacity of 0.16 mol/g and the weight of the sample used is 0.25 g? (Assume the density of the charcoal to be 2.2 g/cm³)

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the surface area of a sample of activated carbon if 10 mL of nitrogen gas (at a temperature of 25°C and a pressure of 1 atm) is adsorbed onto 0.1 g of the carbon with a monolayer capacity of 0.5 mL/g?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the surface area of a sample of activated carbon if it adsorbed 2.5 moles of nitrogen gas at 77 K and 1 atm pressure? The cross-sectional area of nitrogen gas is known to be 16.2 square angstroms.

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the surface area of a sample of activated carbon that adsorbs 2.5 moles of nitrogen gas at 77 K and a pressure of 1 atm according to the BET theory? The sample weight is 3 grams and the molecular weight of nitrogen is 28 g/mol.

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the surface area of a given sample of activated carbon powder, if it has adsorbed 12mL of nitrogen gas at 77 K and a pressure of 1 atm, and assuming the cross-sectional area of a nitrogen molecule to be 0.16 nm²?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the surface area of a sample of activated charcoal determined by gas adsorption using the BET method? Calculate the surface area of the activated charcoal sample given its mass, pore volume, and the adsorption isotherm data.

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the surface area of a solid material (in m²/g) if it has a nitrogen gas adsorption of 0.52 cm³/g at a relative pressure of 0.1 and assuming a monolayer coverage?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the specific surface area of a porous material if 10 mL of nitrogen gas is adsorbed at 77 K and 1 atm and the resulting monolayer thickness is 2.5 nm? The cross-sectional area of a nitrogen molecule is 0.16 nm^2.

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the specific surface area (in m²/g) of a sample of activated carbon that adsorbs 20 ml of nitrogen gas at STP, assuming monolayer formation and a nitrogen cross-sectional area of 0.162 nm²? The mass of the activated carbon sample is 0.5 g.

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the specific surface area of a sample of activated carbon if it adsorbs 0.45 g of nitrogen gas at 77 K and a pressure of 1 atm, assuming a monolayer of adsorbate and that the nitrogen gas occupies a volume of 22.4 L/mol?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the specific surface area of a sample of activated carbon with a BET value of 1000 m²/g, given that the mass of the sample used for the measurement is 0.5 g?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the monolayer capacity of a sample of activated alumina with a surface area of 200 m2/g, using the BET theory of multilayer adsorption and assuming a specific surface area of 16.2 × 10-20 m2 for nitrogen at 77 K?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the maximum adsorption capacity of a Langmuir adsorbent if the equilibrium constant (K) is 0.05 L/mmol and the concentration of adsorbate (C) is 0.02 mmol/L at 298 K? The surface area of adsorbent used in the experiment is 0.4 m²/g.

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the maximum achievable monolayer coverage of a gas on a solid surface at a temperature of 25°C and a pressure of 1 atmosphere, given that the Langmuir constant is 0.05 L/mol?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the BET surface area of a sample of carbon adsorbent that adsorbed 7.2 mmol of nitrogen gas at a liquid nitrogen temperature of 77 K, assuming a monolayer coverage of 5.8 x 10^-7 mol/m2 and a nitrogen pressure of 0.98 atm?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the BET surface area of activated carbon with a monolayer capacity of 25 mg/g and a multilayer capacity of 90 mg/g, given that the weight of the activated carbon used for the experiment was 5 g?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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1 answer 32 views

What surface modifications can be made to biomaterials to enhance their biocompatibility and reduce the risk of adverse reactions when used in medical implants?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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