1
8CB Layers at Different Temperature

• Formation of Liquid Crystalline Phases from a
  Langmuir Monolayer
• By K.A. Suresh and A. Bhattacharyya
• Langmuir 1997, 13, 1377-1380

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Phase Transition of 8CB in Bulk (3D)
20.5 oC
33.3 oC
41.5 oC
Crystal
Smectic A
Nematic
Isotropic
Temperature
3
Typical Isotherm at 25 oC
(T lt 28 oC)
4
Isotherm at 30 oC
(28 oC lt T lt 36 oC)
5
Isotherm at 40 oC
(36 oC lt T lt 36 oC)
6
Images under Fluorescence Microscope
30 oC
25 oC
140 um
Area/Molecule 10 A2
7
Images under Reflection Microscope
25 oC
30 oC
28 oC
Thickness N?/(2n)
Area/Molecule 10 A2
8
Images under Polarized Microscope
30 oC, 10 A2 A/M
Schlieren Textures Boojum-like Textures
? Nematic Phase
9
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