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http://dspace.mediu.edu.my:8181/xmlui/handle/123456789/7772| Title: | Smectic A: cholesteric phase transition investigated by small angle X-ray diffraction and viscosity measurements |
| Issue Date: | 1-Jun-2013 |
| Publisher: | Sociedade Brasileira de Física |
| Description: | We have studied the in influence of the mean molecular length on the nature of the cholesteric (N*) - smectic A (A) liquid crystal phase transition for thermotropic compounds of cholesteryl myristate (C14), cholesteryl nonanoate (C9), and binary mixtures of C14 - C9 and cholesteryl caproate (C6) phase (dA), the mean molecular length (<img src="http:/img/fbpe/bjp/v32n2b/07eq01.gif">) in the N* domain, and the correlation length (epsilon), as well as changes along the N* - A phase transition, were determined from the X-ray diffraction data. The results show a decrease in A phase domain and an expansion of the N* - domain as the mean molecular length is diminished. Such effect induces a second order A - N* phase transition for a particular mixture of 63.1 mol% of C9 and 36.9 mol% of C6, evidenced by viscosity measurements in good agreement with previous density data. |
| URI: | http://koha.mediu.edu.my:8181/jspui/handle/123456789/7772 |
| Other Identifiers: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332002000300007 http://www.doaj.org/doaj?func=openurl&genre=article&issn=01039733&date=2002&volume=32&issue=2b&spage=495 |
| Appears in Collections: | Physics and Astronomy |
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