Formulation of Ocular Ointments: Gels Definition Quiz

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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?

Polymer-like fibrous matrices Signup and view all the answers

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

By reducing temperature or concentration Signup and view all the answers

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

Due to the entanglement of long fibrous aggregates in the matrix Signup and view all the answers

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

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

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

Solvent-polymer interaction, polymer molecular weight, and polymer chain flexibility Signup and view all the answers

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

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

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

Gels are formed by the crosslinking of polymer chains through physical or chemical forces 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?

Their ability to form a stable, viscoelastic network Signup and view all the answers

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

A gel Signup and view all the answers

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

Gels Signup and view all the answers

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

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

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

Polythene Signup and view all the answers

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

Non-greasy nature Signup and view all the answers

How are pastes differentiated from ointments based on the text?

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

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

Solubility in water Signup and view all the answers