Chitosan-Chlorella Hydrogel Beads Swelling Study
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Chitosan-Chlorella Hydrogel Beads Swelling Study

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Questions and Answers

What effect does the presence of Chlorella have on the swelling ratio of hydrogels at lower temperatures?

  • It has no effect on water uptake.
  • It decreases water uptake at equilibrium. (correct)
  • It only affects the ionic strength of hydrogels.
  • It increases water uptake at equilibrium.

    • Which of the following ions shows the strongest ability to retain water in hydrogel matrices, according to the content?

  • K+
  • Na+
  • Ca2+
  • Al3+ (correct)

    • How does the temperature influence the bioactivity of Chlorella in hydrogels?

  • Bioactivity fluctuates but averages out over time.
  • Bioactivity increases at higher temperatures.
  • Bioactivity decreases at higher temperatures. (correct)
  • Bioactivity remains constant regardless of temperature.

    • In terms of osmotic pressure, what occurs with water molecules in hydrogels?

    <p>Water molecules diffuse from inside to outside of the hydrogel.</p> Signup and view all the answers

    Which ion sequence reflects the order of strength in interacting with hydrogels from high to low?

    <p>Al3+ &gt; Ca2+ &gt; Na+</p> Signup and view all the answers

    How does the swelling degree of chitosan–chlorella hydrogel beads respond to increasing concentrations of salt solutions?

    <p>The swelling degree decreases significantly.</p> Signup and view all the answers

    What is the primary mechanism attributed to the decrease in swelling degree of hydrogel beads with higher salt concentrations?

    <p>Decreased water absorption due to salt competition.</p> Signup and view all the answers

    What effect does temperature have on the swelling of chitosan–chlorella hydrogel beads?

    <p>Swelling degree decreases with increasing temperature.</p> Signup and view all the answers

    In a controlled release system utilizing chitosan–chlorella hydrogels, what would be a major concern with using saline solutions?

    <p>Decreased effectiveness of the hydrogel.</p> Signup and view all the answers

    Which of the following best describes the behavior of water retention within chitosan–chlorella hydrogels in relation to osmotic pressure?

    <p>Water retention increases with osmotic pressure from external solutions.</p> Signup and view all the answers

    What primarily influences the swelling degree of chitosan–chlorella hydrogel beads?

    <p>pH levels and ionic strength</p> Signup and view all the answers

    What happens to the chitosan–chlorella hydrogel beads when immersed in a buffer solution with a pH of 6?

    <p>They swell due to electrostatic repulsion</p> Signup and view all the answers

    Why do chitosan–chlorella hydrogel beads shrink at a pH of 10?

    <p>Deprotonation, reducing osmotic pressure difference</p> Signup and view all the answers

    Which of the following describes the mechanism responsible for the swelling of the hydrogel beads?

    <p>Electrostatic repulsion among chains</p> Signup and view all the answers

    What is the characteristic of the swelling behavior of these hydrogels based on the application of different saline solutions?

    <p>pH-dependent and reversible swelling</p> Signup and view all the answers

    How does osmotic pressure relate to the swelling of chitosan–chlorella hydrogel beads?

    <p>It drives the movement of water into or out of the gel</p> Signup and view all the answers

    Which effect contributes to the swelling of hydrogel beads in ionic solutions?

    <p>Anion–anion electrostatic repulsion</p> Signup and view all the answers

    Which factor primarily determines the reversibility of swelling in chitosan–chlorella hydrogels?

    <p>The ionic environment and pH levels</p> Signup and view all the answers

    Study Notes

    Chitosan-Chlorella Hydrogel Beads Swelling

    • The swelling of chitosan-chlorella hydrogel beads is influenced by various factors, including the presence of salts, pH, and temperature.
    • The water absorption of the beads is stronger in salt solutions with higher Chlorella content.
    • The swelling ratio of hydrogel beads decreases with increasing concentration of salt solutions.
    • The order of ionic strength of the salt solutions is Al3+ > Ca2+ > Na+
    • The beads exhibit pH-dependent swelling reversibility.
    • The swelling of the beads is significantly lower in salt solutions compared to distilled water.
    • The swelling of the beads occurs due to electrostatic repulsion caused by protonation at pH 6 and shrinks due to deprotonation at pH 10.
    • The swelling ratio of the beads decreases with increasing temperature.
    • This temperature dependency is attributed to the loss of bioactivity of Chlorella at higher temperatures.

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    Description

    Explore the factors influencing the swelling behavior of chitosan-chlorella hydrogel beads. Understand how variables like salt concentration, pH levels, and temperature affect their water absorption and overall swelling ratio. This quiz delves into the science behind hydrogel interactions and their properties.

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