Formulation of Ocular Ointments: Gels Definition Quiz
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Questions and Answers

What is the primary way in which Supramolecular gels are formed?

  • Through the self-aggregation of small gelator molecules (correct)
  • Through ionic interactions
  • Through covalent bonding
  • Through the rotation of small gelator molecules
  • What allows supramolecular gels to be transformed into a fluid state?

  • Heating (correct)
  • Ionic interactions
  • High pressure
  • Strong covalent bonds
  • What is the key characteristic of liquid crystalline physical gels?

  • Unidirectional flow under gravity
  • Uniformity in all directions (correct)
  • Thermally irreversible phase transitions
  • Covalent bonding with the solvent molecules
  • What type of matrices are formed during the aggregation process in gel formation?

    <p>Polymer-like fibrous matrices</p> Signup and view all the answers

    How is the process of gelation initiated in the formation of gels?

    <p>By reducing temperature or concentration</p> Signup and view all the answers

    Why does a supramolecular gel appear solid despite being composed of a solvent?

    <p>Due to the entanglement of long fibrous aggregates in the matrix</p> Signup and view all the answers

    What are gels characterized by in relation to the polymer concentration?

    <p>A critical polymer concentration below which a gel is not formed</p> Signup and view all the answers

    Which of the following factors does the viscosity of a gel depend on?

    <p>Solvent-polymer interaction, polymer molecular weight, and polymer chain flexibility</p> Signup and view all the answers

    What is the primary characteristic that gives gels their solid-like appearance?

    <p>The entrapment and adhesion of the liquid in a solid 3D matrix</p> Signup and view all the answers

    Which statement best describes the formation of gels using water-soluble polymers?

    <p>Gels are formed by the crosslinking of polymer chains through physical or chemical forces</p> Signup and view all the answers

    Which property of the products mentioned in the text is responsible for maintaining the consistency over a wide temperature range?

    <p>Their ability to form a stable, viscoelastic network</p> Signup and view all the answers

    What type of system is described as a 'viscous cross-linked system' in the context of gels?

    <p>A gel</p> Signup and view all the answers

    Which type of preparation is described as transparent or translucent, non-greasy, and aqueous?

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

    What is the main difference between ointments and creams based on the provided text?

    <p>Ointments are greasy with oleaginous bases, while creams are semi-solid emulsions.</p> Signup and view all the answers

    Which polymer is used to produce Paraffin substitute (Plastibases) according to the text?

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

    What is the characteristic of gels that helps them maintain consistent consistency of medicaments?

    <p>Non-greasy nature</p> Signup and view all the answers

    How are pastes differentiated from ointments based on the text?

    <p>Pastes contain a higher proportion of medicament than ointments.</p> Signup and view all the answers

    What is the primary difference between emulsion bases W/O and O/W based on the text?

    <p>Solubility in water</p> Signup and view all the answers

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