Advantages of Nanoporous Materials Quiz
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Questions and Answers

What is the main limitation of creating nanoporous materials using the bottom-up approach?

  • Dependent on the use of autoclaves
  • Require high temperatures above 200 °C
  • Limited to pores/channels open at both ends
  • Restricted to pores/channels open at one end (correct)

    • In nanoporous materials synthesis, what does SDA stand for?

  • Silane Dissolution Agent
  • Surface Deposition Agent
  • Silica Directing Agent
  • Structural Directing Agent (correct)

    • What is the pore size range typically achieved through molecular templating in nanoporous materials?

  • 1-10 Ångstroms (correct)
  • 10-20 Ångstroms
  • 30-40 Ångstroms
  • 20-30 Ångstroms

    • Which method can be used to measure the pore size and volume of nanoporous materials?

    <p>Gas adsorption using BET isotherm</p> Signup and view all the answers

    What is specific surface area (SSA) a measure of in nanoporous materials?

    <p>The total surface area of a material per unit mass</p> Signup and view all the answers

    How can the pore size distribution and pore structure of nanoporous materials be observed?

    <p>By gas adsorption using BET isotherm</p> Signup and view all the answers

    Which type of adsorption is characterized by the formation of a monolayer?

    <p>Type I</p> Signup and view all the answers

    At what temperature is the N2 saturation pressure approximately 757.30 mmHg?

    <p>77.3 K</p> Signup and view all the answers

    Based on the BET equation, what does the slope of the plot of P/W versus P represent?

    <p>Weight of monolayer nitrogen adsorbed</p> Signup and view all the answers

    In which type of isotherm is the limiting uptake governed by the accessible micropore volume?

    <p>Type III</p> Signup and view all the answers

    In the BET equation, what does 'C' represent?

    <p>Cross-section area</p> Signup and view all the answers

    What is the appropriate linear range of P/P0 in the BET equation dependent on?

    <p>Materials being tested</p> Signup and view all the answers

    What does the inflection point in Type I isotherm indicate?

    <p>Both a and b</p> Signup and view all the answers

    In Type II isotherm, what occurs when adsorption is approaching a limit quantity?

    <p>Multilayer adsorption begins</p> Signup and view all the answers

    What is the formula for the sample surface area (St) according to the text?

    <p>$2MRT$</p> Signup and view all the answers

    What does Type III isotherm form before completing the monolayer?

    <p>&lt; adsorbate-surface</p> Signup and view all the answers

    What is the intercept in the plot of P/W versus P indicative of in the BET equation?

    <p>Condensation coefficient</p> Signup and view all the answers

    In a standard BET test, what does 'W' represent?

    <p>Weight of nitrogen adsorbed at a given relative pressure</p> Signup and view all the answers

    What type of adsorption is represented by Type IV isotherms?

    <p>Reversible adsorption/desorption</p> Signup and view all the answers

    What characterizes the intermediate flat region in Type IV isotherms?

    <p>Monolayer formation</p> Signup and view all the answers

    Which type of isotherm exhibits a combination of characteristics from Type III and Type IV?

    <p>Type V</p> Signup and view all the answers

    What did Langmuir assume in his description of the Type I isotherm?

    <p>Adsorption limited to monolayer</p> Signup and view all the answers

    What does the Langmuir equation for Type I isotherms relate to?

    <p>Weight of adsorbate in a completed monolayer</p> Signup and view all the answers

    What is the main result of Capillary condensation?

    <p>Vapor condenses due to increased interactions inside capillaries</p> Signup and view all the answers

    What is a key advantage of nanoporous materials in terms of adsorption capacity?

    <p>Large surface area</p> Signup and view all the answers

    Why do interconnected pore structures in nanoporous materials enable fast diffusion of guest species?

    <p>Due to interconnected pore structures</p> Signup and view all the answers

    What makes nanoporous materials suitable for mixture separation or confined chemical reactions?

    <p>High selectivity</p> Signup and view all the answers

    What is the main function of a metal organic framework (MOF) structure?

    <p>Catalysis</p> Signup and view all the answers

    In a metal organic framework (MOF), what role does Metal Organic Frameworks (microporous structure) play?

    <p>Secondary building unit (SBU)</p> Signup and view all the answers

    What allows MOF structures to be chemically tailored for different applications?

    <p>Metal ion clusters</p> Signup and view all the answers

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