Effect of nonmesogenic solute on the nematic-smectic-A phase transition
Effect of nonmesogenic solute on the nematic-smectic-A phase transition
复制标题
非介晶溶质对向列-近晶-A相变的影响
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
P. Mukherjee
中科院分区：
文献类型：
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作者：
P. Mukherjee
在朗道现象学理论中研究了非介晶溶质对向列-近晶-A (NA) 转变的影响。当非介晶溶质被添加到由向列相和近晶-A相组成的介晶化合物中时，NA转变温度降低并且由于溶质的杂质的存在而形成两相区。将非介晶溶质减少为纯化合物，一阶 NA 转变在朗道近似的三临界点处变成二阶。还讨论了非介晶溶质对弗兰克弹性常数的影响。
The effect of nonmesogenic solute on the nematic-smectic-A (NA) transition is examined within the Landau phenomenological theory. When nonmesogenic solute are added to a mesogenic compound consisting of both nematic and smectic-A phases, the NA transition temperature is depressed and a two phase region is formed due to the presence of the impurities of the solute. Decreasing the nonmesogenic solute to the pure compound, the first order NA transition becomes second order at the tricritical point in Landau approximation. The effects of nonmesogenic solute on the Frank elastic constants are also discussed.