Novel phase diagram of a mixed Langmuir monolayer of octylcyanobiphenyl and stearic acid

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Title:	Novel phase diagram of a mixed Langmuir monolayer of octylcyanobiphenyl and stearic acid
Authors:	Bhattacharyya, Amitabha. Suresh, K.A.
Issue Date:	1998
Publisher:	EDP Sciences
Citation:	Europhysics Letters, 1998, Vol.41, p641-646
Abstract:	We have studied the phase diagram of a mixed monolayer system of 4$^\prime$-n-octyl-4-cyanobiphenyl (8CB) and stearic acid (SA) at the air-water interface by surface manometry and optical microscopic techniques. We found that in the mixture, a liquid condensed phase (also known as ${\rm L}_2$) was induced which does not occur in the monolayers of the individual components. The induction occurs over a large range of molar concentrations viz. 3% to 95% of SA in 8CB. More interestingly, we observed a phase separation of the liquid expanded (LE) phase (also known as ${\rm L}_1$) into an 8CB-rich LE phase and an SA-rich LE phase for molar concentrations in the range 55% to 95% of SA in 8CB. We also observed a co-existence of three stable phases.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/2819
ISSN:	0295-5075 1286-4854 (Online)
Alternative Location:	http://dx.doi.org/ 10.1209/epl/i1998-00206-0
Copyright:	1998 EDP Sciences
Appears in Collections:	Research Papers (SCM)

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