Influence of sample measuring cell on isothermal crystallization of liquid crystalline compound forming the smectic CA* phase

IF 1.3 4区材料科学 Q3 CRYSTALLOGRAPHY

Phase Transitions Pub Date : 2022-11-04 DOI:10.1080/01411594.2022.2140661

A. Deptuch, E. Juszyńska-Gałązka, A. Drzewicz, M. Piwowarczyk, M. Urbańska, M. Tykarska

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引用次数: 1

Abstract

ABSTRACT Crystallization of liquid crystalline (S)-4′-(1-methylheptyloxycarbonyl) biphenyl-4-yl 4-[7-(2,2,3,3,4,4,4-heptafluorobutoxy) heptyl-1-oxy]-2,3-difluorobenzoate in isothermal conditions is investigated by polarizing optical microscopy and differential scanning calorimetry. It is shown that the sample container influences the crystallization kinetics, as a faster development of the crystal phase is observed on microscopic textures, for a sample in an electro-optic cell with a planarly aligning polymer layer, than for a sample in an aluminum pan used in a differential scanning calorimetry experiment. However, in both cases the total time of melt crystallization in the 291–303 K range is shorter than 10 min. Only at the highest investigated temperature, 305 K, the crystallization process is completed after 1.4 h because of a long initialization time. The difference with the glassforming (S)-4′-(1-methylheptyloxycarbonyl) biphenyl-4-yl 4-[7-(2,2,3,3,4,4,4-heptafluorobutoxy) heptyl-1-oxy]-2-fluorobenzoate is explained based on the thermodynamic driving force of crystallization.

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样品测量池对形成近晶CA*相的液晶化合物等温结晶的影响

用偏光显微镜和差示扫描量热法研究了液晶(S)-4′-(1-甲基庚氧羰基)联苯-4-基4-[7-(2,2,3,3,4,4,4-七氟丁氧基)庚基-1-氧]-2,3-二氟苯甲酸酯在等温条件下的结晶。结果表明，样品容器会影响结晶动力学，因为在显微镜结构上观察到，在具有平面排列聚合物层的电光电池中的样品比在差示扫描量热法实验中使用的铝锅中的样品的晶体相发展更快。然而，在291-303 K范围内，这两种情况下的熔体结晶总时间都短于10 min。仅在305 K的最高温度下，由于初始化时间较长，结晶过程在1.4 h后完成。根据结晶的热力学驱动力解释了与玻璃形(S)-4′-(1-甲基庚氧羰基)联苯-4-基4-[7-(2,2,3,3,4,4,4-七氟丁基)庚基-1-氧]-2-氟苯甲酸盐的区别。

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来源期刊

Phase Transitions 物理-晶体学

CiteScore

3.00

自引率

6.20%

发文量

审稿时长

1.4 months

期刊介绍： Phase Transitions is the only journal devoted exclusively to this important subject. It provides a focus for papers on most aspects of phase transitions in condensed matter. Although emphasis is placed primarily on experimental work, theoretical papers are welcome if they have some bearing on experimental results. The areas of interest include: -structural phase transitions (ferroelectric, ferroelastic, multiferroic, order-disorder, Jahn-Teller, etc.) under a range of external parameters (temperature, pressure, strain, electric/magnetic fields, etc.) -geophysical phase transitions -metal-insulator phase transitions -superconducting and superfluid transitions -magnetic phase transitions -critical phenomena and physical properties at phase transitions -liquid crystals -technological applications of phase transitions -quantum phase transitions Phase Transitions publishes both research papers and invited articles devoted to special topics. Major review papers are particularly welcome. A further emphasis of the journal is the publication of a selected number of small workshops, which are at the forefront of their field.