(see the bottom panel of Fig. 5). Similarly, samples 2 and 4 exhibit similar columnar
liquid crystalline structures: sample 2 exhibits a Col ho phase (Fig. 3b), and sample
4 exhibits an ordered oblique columnar phase (Col oo , Fig. 3c).
Table 1 Phase transition temperatures (
C, above arrow) and heats of transition (kJ/mol, below
arrow) for samples 1–4
Cr crystal, g glass, Col ho ordered hexagonal columnar phase, Col hd disordered hexagonal columnar
phase, Col ro ordered rectangular columnar phase, Col oo ordered oblique columnar phase, I isotropic
Fig. 2 PLM micrographs of Pc(Tp) 4 samples (a) 1 at 165
C, (b) 2 at room temperature, (c) 3 at
160
C, and (d) 4 at room temperature (Miao and Zhu 2010a)
222
L. Zhu