The microscopic mechanism of cholesteric liquid crystals 液晶胆甾相的形成机制
2.
Main ingredient : bio - gold , sodium dna , extracts of ginseng , with hazel , tea and horsetail , cholesteric esters 主要成分:活性金植物dha人参金缕梅茶马尾草提取物。
3.
The form of the interaction potential between molecules is assumed to be the same with which is used in the theory of cholesteric phase 分子间相互作用势与胆甾相微观理论中所采用的作用势相同。
4.
There are some disputes about the potential vx . it had not been proved by far that the form of the chiral potential vx that is generally accepted can induce the cholesteric phase 关于v _ x的形式存在争议，并未从理论上证明目前采用的形式一定会导致胆甾相的螺旋性结构。
5.
The microscopic mechanism of the helix structure is one of the most important questions for cholesteric phase , from the general view , which is because there are chiral potential vx 胆甾相理论的一个核心问题是导致其螺旋性结构的微观机制。一般认为这是由于分子之间存在手性作用势v _ x 。
6.
In this paper , we introduce quantum theory into the liquid crystals in order to research the collective effect ( i . e . the physics effect produced by many - body effect and collective excitation ) . in this way , we research the microscopic theory of nematic phase and cholesteric phase 为了探索其集体效应(多体效应以及集体激发导致的物理效应) ，本文将量子理论引入到液晶体系，研究向列相和胆甾相的微观理论。
7.
The chiral compounds synthesized in the project have an unsaturated double bond , which can be mixed with polymerizable nematic liquid crystal compounds , and the resulting mixture can be polymerized to form an optical film having cholesteric liquid crystal texture 具有可聚合基之旋光性化合物可添加于可聚合型向列型液晶单体中，聚合成具有胆固醇相、反射特定波长之光学薄膜，且较少用量之高螺旋扭转力性质之旋光性化合物即可配出特定螺距之胆固醇液晶纹理。
8.
Abstract : methanesulfonic acid method was used to prepare five acylated chitins . except heptanoyl chitin , four of them , i . e . acetyl chitin , propionyl chitin , butyryl chitin and hexanoyl chitin , had high degree of substitution ( from 1 . 5 to 2 . 0 ) and exhibited lyotropic liquid crystalline behavior and cholesteric phase . as the length of the side chain increased the critical concentration ( w / w ) somewhat increased from 0 . 21 to 0 . 26 because the chain rigidity dropped . the critical concentration values of all the four derivatives were much higher than that of chitin ( 0 . 12 ) due to the decrease of intramolecular hydrogen bonds . the four acylated chitin can form typical banded texture after being sheared . there minimum concentrations to form banded texture of them were evidently different , varied from 0 . 25 ( for acetyl chitin ) to 0 . 37 ( for hexanoyl chitin ) . these results further indicated that liquid crystallinity decreased while the length of flexible side substituents increased 文摘:四种羧酰化甲壳素即乙酰化、丙酰化、丁酰化和己酰化甲壳素在二氯乙酸溶液中均呈现胆甾型溶致液晶相.临界浓度随侧基长度增加而略有增加，衍生物的临界浓度明显都比原甲壳素高许多，这些规律都可以用链刚性的变化来解释.四种羧酰化甲壳素在剪切时均能形成条带织构，而且能形成条带织构的最低浓度有明显差别，随侧基长度增加而提高，进一步表明侧基较长，液晶性减少
