A6. Liquid Crystalline and Supercritical Fluids
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23 Terms
Mesophase
It is the intermediate phase between solid and liquids
liquid crystalline
Mesophase is also known as
1. Rigid
2. Organic
3. Possesses strong dipole and easily polarizable group
4. Elongated and rectilinear in shape
4 Characteristics of molecules that form mesophases
Liquid Crystalline
It has flow properties, birefringent, exhibit color changes with temperature, sensitive to electric fields, anisotropic
Thermotropic LC
Result from heating of solids: Thermotropic LC or Lyotropic LC
Lyotropic LC
Results from action of certain solvents on solids: Thermotropic LC or Lyotropic LC
Smectic, Nematic, Cholesteric
3 Types of Thermotropic LC
Lamellar, Hexagonal, Cubic, Lyotropic Nematic
4 Types of Lyotropic LC
Lamellar
A type of lyotropic LC used in liposomal DDS
Smectic
Soap/grease like
Choices:
Smectic
Nematic
Cholesteric
Smectic
most pharmaceutically important
Choices:
Smectic
Nematic
Cholesteric
Smectic
layer like arrangement
Choices:
Smectic
Nematic
Cholesteric
Nematic
Thread-like
Choices:
Smectic
Nematic
Cholesteric
Nematic
most sensitive to electric field
Choices:
Smectic
Nematic
Cholesteric
Nematic
used in LCDs
Choices:
Smectic
Nematic
Cholesteric
Nematic
parallel arrangement
Choices:
Smectic
Nematic
Cholesteric
Cholesteric
Chiral nematic
Choices:
Smectic
Nematic
Cholesteric
Cholesteric
special type of nematic found free in nature
Choices:
Smectic
Nematic
Cholesteric
Cholesteric
atherosclerosis
Choices:
Smectic
Nematic
Cholesteric
Cholesteric
cork-screw arrangement
Choices:
Smectic
Nematic
Cholesteric
No
Is supercritical fluid included in mesophase?
Supercritical Fluid
It exhibits properties intermediate between liquid and gas and exists under high T and P beyond critical point
CO2 and water used in decaffeination of coffee
Chromatography of polar drugs
Elimination of toxic waste
Applications of Supercritical Fluid (3)
Note 
Flashcards (43)