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Details van artikel 13 van 18 gevonden artikelen
| Titel: |
On the refractive indices, polarizabilities and order parameter of a nematic discogenic mixture |
| Auteur: |
Phillips, T. J. Jones, J. C. |
| Verschenen in: |
Liquid crystals |
| Paginering: | Jaargang 16 (1994) nr. 5 pagina's 805-812 |
| Jaar: |
1994-05-01 |
| Inhoud: |
The phase diagram of a mixture of the discogens triphenylene hexa-n-heptanoate (HET7) and triphenylene hexa-(2-methyl-4-n-decyloxy)benzoate is presented. This mixture provides a more accessible nematic temperature range than was previously possible. The refractive indices of one mixture composition are measured and a rather small, negative birefringence found. The two-parameter Haller extrapolation method is used to calculate the molecular polarizability ratio Δα/α. This has a rather small magnitude compared with calamitic mesogens, although the individual polarizabilities are much larger, due to the greater molecular mass of these compounds. The calculated value of Δα/α is used to give the uniaxial orientational order parameter S, whose value is comparable to those of calamitic examples. Tabulated bond polarizability data are used to predict a value for Δα/α, which is found to be similar to the experimental result. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 13 van 18 gevonden artikelen
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