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作者:... Scott D. Bunge , Robert J. Twieg , Barry D. Dunietz
来源:[J].Organic Electronics(IF 3.836), 2020, Vol.79Elsevier
摘要:Abstract(#br)Charge transport in pyridine-ethynyliodophenyl supramolecules that involve intermolecular halogen bonding is studied by a combined experimental and computational approach. Selective fluorination of the molecules determines their crystallization pattern and is fo...
作者:Robert J. Twieg , Vano Chu ...
来源:[J].Liquid Crystals(IF 1.959), 1996, Vol.20 (3), pp.287-292Taylor & Francis
摘要:The liquid crystalline phases of several rigid-rod, non-polar tolane oligomers are characterized by differential scanning calorimetry and transmitted polarized light microscopy. We determine that a stable nematic phase can be formed at ambient pressure if the molecular axial...
作者:... Na Liu , Robert J. Twieg , Philip J. Bos
来源:[J].Liquid Crystals(IF 1.959), 2009, Vol.36 (10-11), pp.1031-1035Taylor & Francis
摘要:Liquid crystal-based detectors of bio/chemical molecules based on a surface alignment transition of the liquid crystal director have been demonstrated. This type of detector could be made more sensitive if the alignment transition was more abrupt and tunable to be at a 'trig...
作者:... Christopher Viney , Robert J. Twieg , Martina Y. Chang
来源:[J].Molecular Crystals and Liquid Crystals(IF 0.53), 1991, Vol.198, pp.341-350Taylor & Francis
摘要:Light microscopy was used to study the effects of molecular weight and chain flexibility on micro-structural scale in liquid crystalline materials. Studies of poly(p-hydroxybenzoic acid) oligomers show that the scale exhibited by a semiflexible molecule is not sensitive to increa...
作者:Robert J. Twieg , Susan Ermer ...
来源:[J].Molecular Crystals and Liquid Crystals(IF 0.53), 1996, Vol.283, pp.115-118Taylor & Francis
摘要:In order to be useful for electro-optic devices, nonlinear optical chromophores must be thermally stable, highly transparent, and have large hyperpolarizabilities. Although these qualities are to some extent mutually exclusive, a small group of chromophores has been prepared that...
作者:Melati Khairuddean , Robert J. Twieg
来源:[J].Molecular Crystals and Liquid Crystals(IF 0.53), 2009, Vol.503, pp.3-31Taylor & Francis
摘要:A variety of liquid crystals with semifluorinated tails including 4-alkoxybenzoic acids (1d-h), 4-alkoxybenzoyl hydrazines (2d-h), and N,N'-bis(4-alkoxybenzoyl) hydrazines (3d-m) have been synthesized, and their properties are compared with their perhydrogenated analogs. Semifluo...
作者:Robert J. Twieg , Brian C. Auman
来源:[J].Liquid Crystals(IF 1.959), 2008, Vol.35 (10), pp.1191-1197Taylor & Francis
摘要:A novel double-layer alignment film (DLAF) was developed to obtain greater control of the alignment characteristics of the liquid crystal director. The DLAF consists of a thin fluorinated polymer layer on the top of a rubbed non-fluorinated, non-branched polyimide layer (PI 2555)...
作者:DANIEL J. DYER , VICTOR Y. LEE , ROBERT J. TWIEG
来源:[J].Liquid Crystals(IF 1.959), 1997, Vol.23 (4), pp.551-560Taylor & Francis
摘要:Three classes of 4-pyridone (1H-pyridin-4-one) terminated liquid crystals were synthesized and their mesogenic properties examined. These liquid crystal classes differ in the composition of the aromatic core group which vary among azobenzene, stilbene or tolane groups. The synthe...
作者:... Daniel J. Brown , Christine M. Dannels , Robert J. Twieg
来源:[J].Liquid Crystals(IF 1.959), 1993, Vol.13 (1), pp.95-100Taylor & Francis
摘要:Transient disclinations of strength ± 3/2 were observed in the nematic phase of a single-component, thermotropic, rigid rod polytolane. These disclinations were characterized by 6 extinction brushes in textures observed by hot stage transmitted polarized light microscopy. Th...
作者:... Scott D. Bunge , W.E. Moerner , Robert J. Twieg
来源:[J].Tetrahedron(IF 2.803), 2006, Vol.63 (1), pp.103-114Elsevier
摘要:Abstract(#br)We have synthesized several series of DCDHF fluorophores with the amine donor either acyclic or constrained in one or two tetrahydroquinoline rings. The absorption and the fluorescence emission wavelengths and quantum yields have been determined and correlated w...

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