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In this study,right-handed dicinnamate isosorbide was synthesized via the esterification reaction between optically active isosorbide and cinnamate.The chiral dopant was characterized by FT-IR,~1H NMR,elemental analysis,SEM,UV absorption spectrum.After dissolving in a nematic liquid crystal mixture,the chiral dopant exhibited a temperature-dependent solubility in the chiral nematic liquid crystal mixture.Meanwhile,a relatively high value of helical twisting power of the polymerizable chiral dopant was de... 相似文献
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It is shown that the product graph C4n+2×P4k+3 is graceful. 相似文献
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对化学实验进行不断改进和创新,实验才能充满生命和活力,保持其在化学教学中的独特地位。从化学反应原理的模拟、化学实验的深化与完善、化学实验的创新、化学实验中非专业仪器的合理使用等4个方面对高中的30个实验进行了不同程度的改进和创新。 相似文献
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The Doong-Yang model, which is used for predicting gas mixture adsorption equilibrium from pure-component isotherms of the Dubinin type, is modified by incorporating the Lewis relationship. The modified model is tested against experimental data for four binary systems, including a like-component (or nearly ideal) mixture, CH(4) + C(2)H(6), a moderately nonideal mixture, CO(2) + C(2)H(4), and two highly nonideal mixtures, CO(2) + C(3)H(8) and CO(2) + H(2)O. Comparisons are made with the ideal adsorbed solution (IAS) theory and the Bering model. Results show that the proposed model is the best for the like-component mixture and the moderately nonideal mixture. In contrast, for the highly nonideal mixtures, the original Doong-Yang model is the only one among the four models that can predict CO(2) + C(3)H(8) adsorption correctly. The IAS theory and the Bering model have similar predictions and are suitable only for like-component mixtures. The new model requires a simple numerical iteration but is easy to use; no new parameters are required. Theoretical reasons are given for the fact that the original Doong-Yang model is best for nonideal mixtures, whereas the modified Doong-Yang model is best for ideal mixtures. 相似文献
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