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Acyl-Chain Mismatch Driven Superlattice Arrangements In Dppc/Dlpc/Cholesterol Bilayers, Brian Cannon, Anthony Lewis, Pentti Somerharju, Jorma Virtanen, Juyang Huang, Kwan H. Cheng
Acyl-Chain Mismatch Driven Superlattice Arrangements In Dppc/Dlpc/Cholesterol Bilayers, Brian Cannon, Anthony Lewis, Pentti Somerharju, Jorma Virtanen, Juyang Huang, Kwan H. Cheng
Physics and Astronomy Faculty Research
Fluorescence and infrared spectroscopy and cholesterol oxidase activity were employed to investigate the effect of phosphatidylcholine (PC) acyl chain length mismatch on the lateral organizations of lipids in liquid-ordered dipalmitoyl-PC/dilauroyl-PC/cholesterol (DPPC/DLPC/CHOL) bilayers. Plots of steady-state fluorescence emission anisotropy of diphenylhexatriene (DPH) labeled PC (DPH-PC) embedded in the DPPC/DLPC/CHOL bilayers revealed significant peaks at several DPPC mole fractions (YDPPC) when the cholesterol mole fraction (XCHOL) was fixed to particular values. Analogously, the DPH-PC anisotropy peaked at several critical XCHOL’s when YDPPC was fixed. Acyl chain C−H and C═O vibrational peak frequencies of …
Orientational Order Of A Ferroelectric Liquid Crystal With Small Layer Contraction, Rafal Korlacki, Vitaly P. Panov, Atsuo Fukuda, Jagdish K. Vij, Christopher M. Spillmann, Jawad Naciri
Orientational Order Of A Ferroelectric Liquid Crystal With Small Layer Contraction, Rafal Korlacki, Vitaly P. Panov, Atsuo Fukuda, Jagdish K. Vij, Christopher M. Spillmann, Jawad Naciri
Department of Physics and Astronomy: Faculty Publications
We present spectroscopic and optical studies of a non-layer-shrinkage ferroelectric liquid crystal DSiKN65. The orientational order parameters S, measured with respect to the smectic layer normal using IR spectroscopy on a sample aligned homeotropically, does not exhibit any significant variation between the smectic-A* and smectic-C* phases. In contrast the birefringence of a planar homogenous sample abruptly increases at the smectic-A* to smectic-C* transition. This suggests a general increase in the orientational order, which can be described by the orientational order parameters S' defined with respect to the director. Simultaneous increase of S' and the director …