Crystalline Self-Aggregation and a Pressure Driven Solid-Solid Phase Transition in a Fluorinated Langmuir Monolayer

D. Jacquemain; S. Grayer Wolf; F. Leveiller; M. Lahav; L. Leiserowitz; M. Deutsch; K. Kjær; J. Als-Nielsen

doi:10.1051/jphyscol:1989704

Crystalline Self-Aggregation and a Pressure Driven Solid-Solid Phase Transition in a Fluorinated Langmuir Monolayer

D. Jacquemain, S. Grayer Wolf, F. Leveiller, M. Lahav, L. Leiserowitz, M. Deutsch, K. Kjær, J. Als-Nielsen

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Monolayers of PFA, a fluorinated surfactant, on water were studied using synchrotron X-ray grazing incidence diffraction (GID) and reflectivity measurements (XR). The uncompressed monolayer is found to self-assemble into crystalline domains giving a strong GID peak. Upon compression and decompression a surface pressure driven solid-solid phase transition takes place.

A hexagonal lattice with vertical molecules at high pressure undergoes a distortion due to a rigid molecular tilt as the pressure is decreased. Bragg rod scans provide conclusive evidence for a tilt of about 20° at 10 nM/m and show the tilt to be towards nearest neighbours. The uncompressed monolayer has a molecular tilt of about 25°.

Original language	English
Journal	Journal de physique. Colloque
Volume	50
Issue number	C7
Pages (from-to)	29-37
ISSN	0449-1947
DOIs	https://doi.org/10.1051/jphyscol:1989704
Publication status	Published - 1989

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title = "Crystalline Self-Aggregation and a Pressure Driven Solid-Solid Phase Transition in a Fluorinated Langmuir Monolayer",

abstract = "Monolayers of PFA, a fluorinated surfactant, on water were studied using synchrotron X-ray grazing incidence diffraction (GID) and reflectivity measurements (XR). The uncompressed monolayer is found to self-assemble into crystalline domains giving a strong GID peak. Upon compression and decompression a surface pressure driven solid-solid phase transition takes place.A hexagonal lattice with vertical molecules at high pressure undergoes a distortion due to a rigid molecular tilt as the pressure is decreased. Bragg rod scans provide conclusive evidence for a tilt of about 20° at 10 nM/m and show the tilt to be towards nearest neighbours. The uncompressed monolayer has a molecular tilt of about 25°.",

author = "D. Jacquemain and {Grayer Wolf}, S. and F. Leveiller and M. Lahav and L. Leiserowitz and M. Deutsch and K. Kj{\ae}r and J. Als-Nielsen",

year = "1989",

doi = "10.1051/jphyscol:1989704",

language = "English",

volume = "50",

pages = "29--37",

journal = "Journal de physique. Colloque",

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TY - JOUR

T1 - Crystalline Self-Aggregation and a Pressure Driven Solid-Solid Phase Transition in a Fluorinated Langmuir Monolayer

AU - Jacquemain, D.

AU - Grayer Wolf, S.

AU - Leveiller, F.

AU - Lahav, M.

AU - Leiserowitz, L.

AU - Deutsch, M.

AU - Kjær, K.

AU - Als-Nielsen, J.

PY - 1989

Y1 - 1989

N2 - Monolayers of PFA, a fluorinated surfactant, on water were studied using synchrotron X-ray grazing incidence diffraction (GID) and reflectivity measurements (XR). The uncompressed monolayer is found to self-assemble into crystalline domains giving a strong GID peak. Upon compression and decompression a surface pressure driven solid-solid phase transition takes place.A hexagonal lattice with vertical molecules at high pressure undergoes a distortion due to a rigid molecular tilt as the pressure is decreased. Bragg rod scans provide conclusive evidence for a tilt of about 20° at 10 nM/m and show the tilt to be towards nearest neighbours. The uncompressed monolayer has a molecular tilt of about 25°.

AB - Monolayers of PFA, a fluorinated surfactant, on water were studied using synchrotron X-ray grazing incidence diffraction (GID) and reflectivity measurements (XR). The uncompressed monolayer is found to self-assemble into crystalline domains giving a strong GID peak. Upon compression and decompression a surface pressure driven solid-solid phase transition takes place.A hexagonal lattice with vertical molecules at high pressure undergoes a distortion due to a rigid molecular tilt as the pressure is decreased. Bragg rod scans provide conclusive evidence for a tilt of about 20° at 10 nM/m and show the tilt to be towards nearest neighbours. The uncompressed monolayer has a molecular tilt of about 25°.

U2 - 10.1051/jphyscol:1989704

DO - 10.1051/jphyscol:1989704

M3 - Journal article

SN - 0449-1947

VL - 50

SP - 29

EP - 37

JO - Journal de physique. Colloque

JF - Journal de physique. Colloque

IS - C7

ER -

Crystalline Self-Aggregation and a Pressure Driven Solid-Solid Phase Transition in a Fluorinated Langmuir Monolayer

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