Modulated Structures in Smectics: Longitudinal and Transverse Modulations in Smectic a Phases of Terminally Nonpolar Molecules as Shown by X-Ray Diffraction

1985 ◽  
Vol 1 (5) ◽  
pp. 139-145 ◽  
Author(s):  
E. H. Pape
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Smectic A ◽  
Modulated Structures ◽  
Nonpolar Molecules

scholarly journals Influence of spacer chain lengths and polar terminal groups on the mesomorphic properties of tethered 5-phenylpyrimidines

2009 ◽  
Vol 5 ◽  
Author(s):  
Gundula F Starkulla ◽  
Elisabeth Kapatsina ◽  
Angelika Baro ◽  
Frank Giesselmann ◽  
Stefan Tussetschläger ◽  
...  
Keyword(s):  
Terminal Group ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Maximum Phase ◽  
X Ray ◽  
Smectic A ◽  
Polar Groups ◽  
Chain Lengths ◽  
Mesomorphic Properties ◽  
Phase Width

Based on 5-(4-hydroxyphenyl)-2-octylpyrimidine 8, 5-phenylpyrimidine derivatives 3–7, 9 with different spacer chain lengths (C2 up to C6) and different terminal polar groups (Br, Cl, N3, OH, CN) were synthesized by etherification and nucleophilic substitution. The mesomorphic behaviour of these compounds was investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (WAXS and SAXS) and revealed smectic A mesophases for bromides, chlorides and azides 3, 4 and 6. For these compounds a maximum phase width was observed for the C5 spacer regardless of the terminal group, whereas the hydroxy- and cyano-substituted derivatives 5 and 7, respectively, were non mesomorphic and showed only melting transitions.

Structure determination of modulated structures by powder X-ray diffraction and electron diffraction

2016 ◽  
Vol 3 (11) ◽  
pp. 1351-1362 ◽  
Author(s):  
Zhengyang Zhou ◽  
Lukáš Palatinus ◽  
Junliang Sun
Keyword(s):  
Electron Diffraction ◽  
Structure Determination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Modulated Structures ◽  
Conventional Methods

The combination of PXRD and ED is applied to determine modulated structures which resist solution by more conventional methods.

scholarly journals Smectic A: cholesteric phase transition investigated by small angle X-ray diffraction and viscosity measurements

2002 ◽  
Vol 32 (2b) ◽  
pp. 495-500 ◽  
Author(s):  
E. L. Duarte ◽  
R. Itri ◽  
A. R. Sampaio ◽  
M. Simões ◽  
A. J. Palangana
Keyword(s):  
Phase Transition ◽  
Small Angle ◽  
X Ray Diffraction ◽  
Cholesteric Phase ◽  
X Ray ◽  
Viscosity Measurements ◽  
Smectic A

Order parameter and packing studies in nematic and smectic A phases by x‐ray diffraction

1988 ◽  
Vol 89 (5) ◽  
pp. 3317-3322 ◽  
Author(s):  
W. Haase ◽  
Z. X. Fan ◽  
H. J. Müller
Keyword(s):  
Order Parameter ◽  
X Ray Diffraction ◽  
X Ray ◽  
Smectic A

Small-angle x-ray diffraction study of mixtures showing re-entrant nematic phase and induced smectic Ad phase

1998 ◽  
Author(s):  
S. K. Giri ◽  
N. K. Pradham ◽  
R. Paul ◽  
S. Paul ◽  
P. Mandal ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Small Angle ◽  
Nematic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Smectic A

X-ray diffraction study of smectic A layering in terminally fluorinated liquid crystal materials

1993 ◽  
Vol 15 (3) ◽  
pp. 361-376 ◽  
Author(s):  
T. A. Lobko ◽  
B. I. Ostrovskii ◽  
A. I. Pavluchenko ◽  
S. N. Sulianov
Keyword(s):  
Liquid Crystal ◽  
Diffraction Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Smectic A ◽  
Liquid Crystal Materials
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