Journal article
Determination of alkyl chain tilt angles in Langmuir monolayers: A comparison of Brewster angle autocorrelation spectroscopy and x-ray diffraction
Brewster angle autocorrelation spectroscopy (BAAS), a combination of Brewster angle microscopy and the photocorrelation technique is a new method for the quantitative characterization of Langmuir monolayers. In this paper we compare tilt angle measurements in octadecanol monolayers performed using BAAS and grazing incidence x-ray diffraction (GIXD).
BAAS offers the possibility of tilt angle measurements in Langmuir monolayers—without any fitted parameters—with a precision similar to GIXD, but ten times faster. GIXD, conversely, offers detailed microscopic information not available from BAAS. The swiftness of BAAS is exploited for a detailed analysis of the phase transitions from the L2′ phase to the LS (Rotator I) and LS (Rotator II) phases.
The L2′/LS (Rot I) transition is of first order whereas the L2′/LS (Rot II) transition is more probably of weak first order than of second order.
Language: | English |
---|---|
Publisher: | American Institute of Physics |
Year: | 1998 |
Pages: | 4640-4646 |
ISSN: | 10897690 and 00219606 |
Types: | Journal article |
DOI: | 10.1063/1.475874 |