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2 article(s) from Roberts, Jeffrey C

Formation of smectic phases in binary liquid crystal mixtures with a huge length ratio

Nadia Kapernaum,
Friederike Knecht,
C. Scott Hartley,
Jeffrey C. Roberts,
Robert P. Lemieux and
Frank Giesselmann

Beilstein J. Org. Chem. 2012, 8, 1118–1125, doi:10.3762/bjoc.8.124

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Graphical Abstract

Figure 1: Smectic A phase of a mixture of two mesogens differing strongly in molecular length. Left: The laye...

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Scheme 1: Chemical structures and phase-transition temperatures of the mesogens 2PhP and PhP16 and of the chi...

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Figure 2: Molecular structures and molecular lengths of 2PhP and PhP16. The longer mesogen PhP16 is approxima...

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Figure 3: The phase diagram of the binary mixture system PhP16/2PhP.

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Figure 4: The layer spacing obtained by SAXS-measurements in the SmA phase at T = T_c is plotted against the m...

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Figure 5: Reduced layer spacing d/d_A versus temperature difference to the phase-transition temperature T−T_c f...

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Figure 6: The tilt angle θ is plotted against the temperature difference to the phase-transition temperature T...

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Figure 7: Translational order parameter Σ in the SmA phase versus temperature difference to the phase-transit...

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Figure 8: Textures of the pure compound PhP16 on cooling. Left: SmC phase at 96.8 °C Right: same positions in...

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Figure 9: Integrated intensity profile of an unoriented sample of PhP16 at T = 82.5 °C in the SmF phase.

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Figure 10: (a) WAXS-measurement of the SmF phase of PhP16 at T = 82 °C with the smectic-layer normal k oriente...

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Figure 11: (a) WAXS-measurement of the SmF phase of PhP16 at T = 88 °C with the smectic layer normal oriented ...

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Figure 12: (a) Layer spacing of the SmF and the SmC phase of the pure compound PhP16 in dependence of the temp...

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Full Research Paper

Published 19 Jul 2012

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Molecular length distribution and the formation of smectic phases

Nadia Kapernaum,
C. Scott Hartley,
Jeffrey C. Roberts,
Robert P. Lemieux and
Frank Giesselmann

Beilstein J. Org. Chem. 2009, 5, No. 65, doi:10.3762/bjoc.5.65

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Graphical Abstract

Figure 1: Structure of different liquid crystalline phases build with two kinds of hard spherocylinders with ...

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Scheme 1: Chemical formulas and phase sequences of the mesogens PhP14, 6PhPz and 2PhP and the chiral dopant M...

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Figure 2: Molecular structure of the mesogens PhP14, 6PhPz and 2PhP differing in molecular lengths by a facto...

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Figure 3: Phase diagram of the system 2PhP/PhP14. Over a broad temperature and concentration range only the S...

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Figure 4: The layer spacing in the SmA phase at T = T_c vs mole fraction for the system 2PhP/PhP14 (filled tri...

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Figure 5: Reduced layer spacing for the mixtures which exhibit SmA and SmC phases in the system 2PhP/PhP14. P...

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Figure 6: Textures of the mixture with 65% PhP14 in 2PhP as observed in the polarizing microscope. The upper ...

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Figure 7: Tilt angle vs temperature difference to the phase transition temperature for pure PhP14 (filled tri...

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Figure 8: The translational order parameter Σ in the SmA phase is plotted vs the reduced temperature 1 – T/T_c...

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Figure 9: Phase diagram of the system 6PhPz/PhP14. Over a broad temperature region only the SmA phase is stab...

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Figure 10: Reduced layer spacing vs temperature difference to the phase transition temperature for the mixture...

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Figure 11: Schematic sketches of different models for smectic A ordering of bidisperse mesogens. Different mod...

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Full Research Paper

Published 13 Nov 2009

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