Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals

The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made use of measurements of the refractive index anisotropy, following the methodology of Halle [ 1 ] to measure the order parameter, . This method...

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Published inLiquid crystals Vol. 37; no. 6-7; pp. 949 - 959
Main Authors Gleeson, H.F., Southern, C.D., Brimicombe, P.D., Goodby, J.W., Görtz, V.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 01.06.2010
Taylor & Francis Ltd
Subjects
Anisotropy
biaxial order
Crystallography
Crystals
Liquid crystals
Materials science
Methodology
Nematic
Order parameters
orientational order parameters
polarised Raman spectroscopy
Raman spectroscopy
Refractive index
Refractivity
Spectrum analysis
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Abstract The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made use of measurements of the refractive index anisotropy, following the methodology of Halle [ 1 ] to measure the order parameter, . This method is reviewed briefly and some typical areas of application are presented. Raman spectroscopy is a second approach discussed in this paper. Although technically a more complex methodology, Raman spectroscopy has the significant advantage that in addition to being able to measure it is also possible to determine . A review of current approaches is presented. Very recently, it has been shown that polarised Raman spectroscopy can be employed to determine biaxial order parameters in liquid crystals. The methodology is described, and data are presented for such measurements on a series of bent-core nematic materials that could exhibit the elusive biaxial nematic phase.
AbstractList The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made use of measurements of the refractive index anisotropy, following the methodology of Halle [ 1 ] to measure the order parameter, . This method is reviewed briefly and some typical areas of application are presented. Raman spectroscopy is a second approach discussed in this paper. Although technically a more complex methodology, Raman spectroscopy has the significant advantage that in addition to being able to measure it is also possible to determine . A review of current approaches is presented. Very recently, it has been shown that polarised Raman spectroscopy can be employed to determine biaxial order parameters in liquid crystals. The methodology is described, and data are presented for such measurements on a series of bent-core nematic materials that could exhibit the elusive biaxial nematic phase.
The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made use of measurements of the refractive index anisotropy, following the methodology of Halle [1] to measure the order parameter, [image omitted]. This method is reviewed briefly and some typical areas of application are presented. Raman spectroscopy is a second approach discussed in this paper. Although technically a more complex methodology, Raman spectroscopy has the significant advantage that in addition to being able to measure [image omitted] it is also possible to determine [image omitted]. A review of current approaches is presented. Very recently, it has been shown that polarised Raman spectroscopy can be employed to determine biaxial order parameters in liquid crystals. The methodology is described, and data are presented for such measurements on a series of bent-core nematic materials that could exhibit the elusive biaxial nematic phase.
The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made use of measurements of the refractive index anisotropy, following the methodology of Halle [1] to measure the order parameter, ... This method is reviewed briefly and some typical areas of application are presented. Raman spectroscopy is a second approach discussed in this paper. Although technically a more complex methodology, Raman spectroscopy has the significant advantage that in addition to being able to measure ... it is also possible to determine ... A review of current approaches is presented. Very recently, it has been shown that polarised Raman spectroscopy can be employed to determine biaxial order parameters in liquid crystals. The methodology is described, and data are presented for such measurements on a series of bent-core nematic materials that could exhibit the elusive biaxial nematic phase. (ProQuest: ... denotes formulae/symbols omitted.)
Author Goodby, J.W.
Brimicombe, P.D.
Gleeson, H.F.
Görtz, V.
Southern, C.D.
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Snippet The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made...
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SubjectTerms Anisotropy
biaxial order
Crystallography
Crystals
Liquid crystals
Materials science
Methodology
Nematic
Order parameters
orientational order parameters
polarised Raman spectroscopy
Raman spectroscopy
Refractive index
Refractivity
Spectrum analysis
Title Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals
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