Smectic C to smectic A transition induced mechanically by the rupture of freely suspended liquid crystal films.

Smectic C to smectic A transition induced mechanically by the rupture of freely suspended liquid crystal films.
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由悬浮液晶膜破裂机械诱导的近晶 C 到近晶 A 的转变

DOI:
10.1039/c7sm00219j
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发表时间:
2017
期刊:
影响因子:
3.4
通讯作者:
R. Stannarius
R. Stannarius
中科院分区:
化学2区
文献类型:
--
作者:
T. Trittel;K. Harth;R. Stannarius

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近晶C相的倾角可以由性质非常不同的外力控制。尤其是在近晶A-近晶C转变附近,它对温度变化很敏感。它可以受到电场(电倾斜效应)的影响,甚至受到弹性体中层内应力的机械影响。我们发现,在自立的近晶C膜断裂过程中,毛细作用力可以触发近晶C向近晶A的转变,从而迅速减小薄膜的表面积,同时增加薄膜的厚度。这种效应发生在亚毫秒级,实际上与薄膜厚度和温度无关。我们认为,这种机械效应甚至可以在手性相中触发铁电到顺电的转变。
The tilt angle of smectic C phases can be controlled by external forces of very different nature. In particular near a smectic A–smectic C transition, it is susceptible to temperature changes. It can be influenced with electric fields (electroclinic effect), and even mechanically by intra-layer stresses in elastomers. We show that capillary forces that act during the rupture of a free-standing smectic C film can trigger a smectic C to smectic A transition, which rapidly reduces the surface area of the films, concurrently increasing the film thickness. The effect occurs on the sub-millisecond scale, practically independent of film thickness and temperature. We propose that this mechanical effect could even trigger a ferroelectric to paraelectric transition in chiral phases.
独立近晶薄膜半月板的原子力显微镜
DOI: --
发表时间: 2011
期刊:
影响因子: --
作者:
K. Harth;B. Schulz;C. Bahr;R. Stannarius
通讯作者: R. Stannarius
近晶-A-手性-近晶-C 相变的广义平均场模型。
DOI: --
发表时间: 1986
期刊: Physical review. A, General physics
影响因子: --
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DOI: --
发表时间: 1987
期刊:
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期刊: Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
影响因子: --
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关于两种不同类型的近晶 C 到近晶 A 转变的实验证据
DOI: 10.1080/01406567708071949
发表时间: 1977
影响因子: 0.7
作者:
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