On the nature of the smectic mesophase in 8CB + 10CB binary mixtures. Evidences for a smectic A to nematic tricritical point

The two-component system octylcyanobiphenyl(8CB) + decylcyanobiphenil(10CB) has been studied by means of Modulated Differential Scanning Calorimetry, optical microscopy and X-ray diffraction. Although the general trends of the phase diagram are similar to that proposed by Marynissen et al., addition...

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Bibliographic Details
Published in:	Chemical physics letters Vol. 376; no. 1; pp. 188 - 193
Main Authors:	Lafouresse, M.G, Sied, M.B, Allouchi, H, López, D.O, Salud, J, Tamarit, J.Ll
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 17-07-2003 Elsevier Science
Subjects:	Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science; rheology Equations of state, phase equilibria, and phase transitions Exact sciences and technology Materials science Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Phase diagrams of other materials Physics Specific phase transitions Transitions in liquid crystals Latent heat Phase diagrams Mesophases Smectic crystals Experimental study Liquid crystal phase transformations
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Summary:	The two-component system octylcyanobiphenyl(8CB) + decylcyanobiphenil(10CB) has been studied by means of Modulated Differential Scanning Calorimetry, optical microscopy and X-ray diffraction. Although the general trends of the phase diagram are similar to that proposed by Marynissen et al., additional evidences for the existence of TCP have been reported, the composition being about 0.2, which is slightly lower than that proposed in the aforementioned work. Additionally, the smectic mesophase of the 8CB + 10CB mixtures has been characterised through X-ray diffraction and optical measurements as smectic A for the whole composition range. Such a result is against the recent work of Oweimreen and Hwang.
ISSN:	0009-2614 1873-4448
DOI:	10.1016/S0009-2614(03)00904-7