Possibility of isostructural condensed states of matter in the D phase of ANBC and the cubic mesophase of BABH: heat capacity of 4'-n-octadecyloxy-3'-nitrobiphenyl-4-carboxlic acid, ANBC(18)
Possibility of isostructural condensed states of matter in the D phase of ANBC and the cubic mesophase of BABH: heat capacity of 4'-n-octadecyloxy-3'-nitrobiphenyl-4-carboxlic acid, ANBC(18)
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ANBC D 相和 BABH 立方中间相中物质同构凝聚态的可能性：4-n-十八烷氧基-3-硝基联苯-4-羧酸的热容，ANBC(18)
DOI：
10.1080/026782999204219
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发表时间：
1999
期刊：
影响因子：
2.2
通讯作者：
M. Sorai
中科院分区：
文献类型：
--
作者：
A. Sato;Y. Yamamura;Kazuya Saito;M. Sorai
用绝热量热法测量了ANBC（18）在8 ~ 490 K温度范围内的热容。检测到所有已知相。确定了所观察到的相变的温度、相变熵和相变熵。根据D相或立方相向SmC相转变的熵，指出ANBC的D相和BABH的立方相在性质上可能是相同的。它示出的“分子”的核心的安排具有更高程度的各向同性（D和立方）相比在SmC相的顺序，而末端烷氧基链更无序的各向同性相比在SmC相。在D和立方相相对于SmC相的无序度在每个亚甲基的过渡熵方面非常相似。ANBC（SmC D on heating）和BABH（cubic SmC）中的反转相序可以用分子核和分子链之间熵的竞争作用来解释。
Heat capacity measurements have been made on ANBC(18) at temperatures from 8 to 490 K by adiabatic calorimetry. All known phases were detected. The temperatures, enthalpies and entropies of transition were determined for the phase transitions observed. On the basis of the entropy of transition to the SmC phase from the D or cubic phases, it is pointed out that the D phase of ANBC and the cubic phase of BABH might be identical in nature. It is shown that the arrangement of 'molecular' cores has a higher degree of order in the isotropic (D and cubic) phases than in the SmC phase, whereas the terminal alkoxy chains are more disordered in the isotropic phases than in the SmC phase. The degrees of disorder in the D and cubic phases relative to the SmC phase are very similar in terms of the entropy of transition per methylene group. The inverted phase sequence in ANBC (SmC D on heating) and BABH (cubic SmC) can be accounted for in terms of the competing roles in the entropy between the molecular core and the ch...
影响因子：
2.4
作者：
PRESTONTHOMAS, H
通讯作者：
PRESTONTHOMAS, H