Rich polymorphism of a rod-like liquid crystal (8CB) confined in two types of unidirectional nanopores

R. Guégan; D. Morineau; R. Lefort; W. Béziel; M. Guendouz; L. Noirez; A. Henschel; P. Huber

doi:10.1140/epje/i2007-10323-0

Rich polymorphism of a rod-like liquid crystal (8CB) confined in two types of unidirectional nanopores

R. Guégan^*, D. Morineau, R. Lefort, W. Béziel, M. Guendouz, L. Noirez, A. Henschel, P. Huber

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

We present a neutron and X-rays scattering study of the phase transitions of 4-n-octyl-4' -cyanobiphenyl (8CB) confined in unidirectional nanopores of porous alumina and porous silicon (PSi) membranes with an average diameter of 30nm. Spatial confinement reveals a rich polymorphism, with at least four different low temperature phases in addition to the smectic A phase. The structural study as a function of thermal treatments and conditions of spatial confinement allows us to get insights into the formation of these phases and their relative stability. It gives the first description of the complete phase behavior of 8CB confined in PSi and provides a direct comparison with results obtained in bulk conditions and in similar geometric conditions of confinement but with reduced quenched disorder effects using alumina anopore membranes.

Original language	English
Pages (from-to)	261-273
Number of pages	13
Journal	European Physical Journal E
Volume	26
Issue number	3
DOIs	https://doi.org/10.1140/epje/i2007-10323-0
Publication status	Published - 2008 Jul
Externally published	Yes

ASJC Scopus subject areas

Biotechnology
Biophysics
Chemistry(all)
Materials Science(all)
Surfaces and Interfaces

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10.1140/epje/i2007-10323-0

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abstract = "We present a neutron and X-rays scattering study of the phase transitions of 4-n-octyl-4' -cyanobiphenyl (8CB) confined in unidirectional nanopores of porous alumina and porous silicon (PSi) membranes with an average diameter of 30nm. Spatial confinement reveals a rich polymorphism, with at least four different low temperature phases in addition to the smectic A phase. The structural study as a function of thermal treatments and conditions of spatial confinement allows us to get insights into the formation of these phases and their relative stability. It gives the first description of the complete phase behavior of 8CB confined in PSi and provides a direct comparison with results obtained in bulk conditions and in similar geometric conditions of confinement but with reduced quenched disorder effects using alumina anopore membranes.",

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AU - Guégan, R.

AU - Morineau, D.

AU - Lefort, R.

AU - Béziel, W.

AU - Guendouz, M.

AU - Noirez, L.

AU - Henschel, A.

AU - Huber, P.

PY - 2008/7

Y1 - 2008/7

N2 - We present a neutron and X-rays scattering study of the phase transitions of 4-n-octyl-4' -cyanobiphenyl (8CB) confined in unidirectional nanopores of porous alumina and porous silicon (PSi) membranes with an average diameter of 30nm. Spatial confinement reveals a rich polymorphism, with at least four different low temperature phases in addition to the smectic A phase. The structural study as a function of thermal treatments and conditions of spatial confinement allows us to get insights into the formation of these phases and their relative stability. It gives the first description of the complete phase behavior of 8CB confined in PSi and provides a direct comparison with results obtained in bulk conditions and in similar geometric conditions of confinement but with reduced quenched disorder effects using alumina anopore membranes.

AB - We present a neutron and X-rays scattering study of the phase transitions of 4-n-octyl-4' -cyanobiphenyl (8CB) confined in unidirectional nanopores of porous alumina and porous silicon (PSi) membranes with an average diameter of 30nm. Spatial confinement reveals a rich polymorphism, with at least four different low temperature phases in addition to the smectic A phase. The structural study as a function of thermal treatments and conditions of spatial confinement allows us to get insights into the formation of these phases and their relative stability. It gives the first description of the complete phase behavior of 8CB confined in PSi and provides a direct comparison with results obtained in bulk conditions and in similar geometric conditions of confinement but with reduced quenched disorder effects using alumina anopore membranes.

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Rich polymorphism of a rod-like liquid crystal (8CB) confined in two types of unidirectional nanopores

Abstract

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