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- W2060843651 abstract "A homologous series of novel heterogemini surfactants, (N,N-dimethyl-N-[3-(alkyloxy)-2-hydroxypropyl]-alkylammonium bromide (referred to as CmOhpNCn; m, n=10, 8; 12, 8; 14, 8; 16, 8; 14, 10; 12, 12 and 10, 14) were synthesized. Their thermotropic phase behavior was investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), infrared spectroscopy (IR) and X-ray diffraction (XRD). All the compounds showed high thermal stability and formed enantiotropic thermotropic smectic A liquid crystals. The mesophase region was sensitive to the overall length (m+n) of the two hydrophobic tails and was widened with increasing (m+n). When fixing the overall length of the two hydrophobic tails (m+n=24), the liquid crystal region was affected little by the dissymmetry of the two hydrophobic chains. The combination of IR and XRD results suggested the cis-configuration of the alkyl chain and the alkoxy chain with respect to the extended N–CH2–CH(OH) skeleton in both crystal lattice and liquid crystal mesophase. The folding of the alkoxy chain at the carbon atom connecting the hydroxyl group led to the hydrogen bonding between the hydroxyl and the Br− counterion, which is beneficial to stabilizing the liquid crystal phase." @default.
- W2060843651 created "2016-06-24" @default.
- W2060843651 creator A5008135183 @default.
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- W2060843651 date "2009-03-01" @default.
- W2060843651 modified "2023-10-12" @default.
- W2060843651 title "Synthesis and thermotropic liquid crystalline properties of heterogemini surfactants containing a quaternary ammonium and a hydroxyl group" @default.
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- W2060843651 doi "https://doi.org/10.1016/j.jcis.2008.11.056" @default.
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