V16_Paper Parameters in Materials Electrical Engineering
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Questions and Answers

What parameter is defined as the ratio of a paper's inner area to its projected area?

  • Surface roughness
  • Protein binding capacity
  • Pore size (correct)
  • Porosity
  • Which material is NOT listed as a potential hydrophobic agent for creating micron-scale capillary channels on paper?

  • Polyethylene (correct)
  • Wax
  • Paraffin
  • Polystyrene
  • What is the preferred color for the paper in the context of colorimetric tests mentioned in the text?

  • Green
  • Blue
  • Yellow
  • White (correct)
  • Which parameter relates to the time required for a sample to move along and saturate the paper with a defined length?

    <p>Capillary flow rate</p> Signup and view all the answers

    What type of charge is preferred in papers used for colorimetric tests according to the text?

    <p>Low electrostatic charge</p> Signup and view all the answers

    Which characteristic is NOT mentioned as a paper parameter for microfluidic paper-based devices in the text?

    <p>Color quality</p> Signup and view all the answers

    What is the purpose of using wax as the 'ink' in the wax printing fabrication method?

    <p>To create hydrophobic barriers on the paper</p> Signup and view all the answers

    What is the key difference between the wax printing and the alkyl ketene dimer (AKD) printing methods for fabricating paper-based microfluidic devices?

    <p>Wax printing is a physical deposition process, while AKD printing is a chemical modification process</p> Signup and view all the answers

    What is the primary function of the hydrophobic areas created by the AKD printing method in paper-based microfluidic devices?

    <p>To guide fluid flow through the device</p> Signup and view all the answers

    Which of the following properties of paper is the most important for its use in microfluidic devices?

    <p>Capillary action</p> Signup and view all the answers

    How does the AKD printing method modify the surface properties of the cellulose fibers in the paper?

    <p>It renders the fibers hydrophobic (contact angle 110°-125°)</p> Signup and view all the answers

    Which of the following is a key advantage of the wax printing fabrication method for paper-based microfluidic devices?

    <p>It can be completed within a few minutes</p> Signup and view all the answers

    What are the key factors that enable the spontaneous filling of capillaries and microchannels?

    <p>Adhesive/cohesive forces, surface tension, and Laplace pressure</p> Signup and view all the answers

    Which of the following is NOT a component of the capillary effect crucial for microfluidics?

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

    In paper-based microfluidics, what materials are commonly used to manufacture Paper-based Analytical Devices (µPADs)?

    <p>Cellulosic materials like filter paper and chromatographic paper</p> Signup and view all the answers

    What is the minimum required content of α-cellulose in cellulosic materials used for manufacturing paper in microfluidics?

    <p>A minimum of 98%</p> Signup and view all the answers

    Which property of cellulosic paper makes it suitable for microfluidic applications?

    <p>Porous structure</p> Signup and view all the answers

    What role do Lateral Flow Strips (LFSs) play in the context of microfluidics?

    <p>They facilitate the filling of microchannels</p> Signup and view all the answers

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