期刊
LIQUID CRYSTALS
卷 35, 期 10, 页码 1215-1224出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678290802509400
关键词
liquid crystal; Arrhenius theory; surface kinetics; calorimeter; magnetic effect on phase transitions
资金
- Germano Iannacchione
In this study we explore the interesting kinetics of nanocolloids formed by the solvent dispersion method (SDM) in an aligned matrix of octylcyanobiphenyl (8CB) liquid crystals and aerosil nanoparticles. The presence of alignment changes the behaviour of the induced crystallisation (IC), and melting transition (K-SmA) observed in the aligned nanocolloidal liquid crystal samples when compared with unaligned samples. Heating-rate-dependent experiments were performed for the aligned and unaligned samples at various heating ramp rates varied from 20 to 1Kmin-1 using a calorimetric technique. In the aligned samples, the IC transition peak shifts towards higher temperature, whereas the melting transition peak shifts towards lower temperature. The IC peak shows an increase in enthalpy whereas the melting transition shows a decrease following an Arrhenius behaviour. The presence of alignment increases the activated kinetics of the system. This behaviour can be explained in terms of molecular interaction between aligned domains of nanocolloids in the 8CB matrix which makes the material stiffer.
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