| Issue |
Europhys. Lett.
Volume 41, Number 6, March II 1998
|
|
|---|---|---|
| Page(s) | 641 - 646 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00206-0 | |
| Published online | 01 September 2002 | |
Novel phase diagram of a mixed Langmuir monolayer of octylcyanobiphenyl and stearic acid
Raman Research Institute, Bangalore 560080 India
Corresponding author: suresh@rri.ernet.in
Received:
29
August
1997
Accepted:
26
January
1998
We have studied the phase diagram of a mixed monolayer system of
4
-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 
) 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 
) 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.
PACS: 68.15.+e – Liquid thin films / 05.70.Fh – Phase transitions: general aspects
© EDP Sciences, 1998
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