Stripe instabilities in menisci of free-standing smectic films with a direct transition from smectic C to an isotropic or nematic phase
Stripe instabilities in menisci of free-standing smectic films with a direct transition from smectic C to an isotropic or nematic phase
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从近晶 C 直接转变为各向同性或向列相的独立近晶薄膜弯液面中的条纹不稳定性
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
K. Harth
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作者：
R. Stannarius;A. Eremin;K. Harth
在近晶C和C自由悬浮薄膜的半月面中发现的规则周期条纹图案是Meyer和Pershan(Solid State Commun)首先描述的。13(1973))，但它们的物理起源仍在争论中。Loudet等人。(物理。莱特牧师。106117,802(2011)提出了层膨胀模型来解释它们的形成。我们在从近晶C到向列相或各向同性相直接转变的薄膜中观察到的这种模式与这个模型有很大的冲突。此外，我们还证明了从同宿近晶C相向反宿近晶C相过渡时花样的消失。必须寻求对条纹形成的物理机制作出本质上不同的解释。我们提出了不稳定的潜在来源。图形摘要
ABSTRACT Regular periodic stripe patterns that are found in the menisci of smectic C and C freely suspended films were described first by Meyer and Pershan (Solid State Commun. 13 (1973)) more than 40 years ago, but their physical origin is still under debate. Loudet et al. (Phys. Rev. Lett. 106 117, 802 (2011)) proposed a layer dilatation model to explain their formation. Our observation of such patterns in films with a direct transition from smectic C to a nematic or isotropic phase is in sharp conflict with that model. Moreover, we demonstrate the disappearance of the patterns at the transition from synclinic to anticlinic smectic C phases. An essentially different explanation of the physical mechanism of the stripe formation must be sought. We propose potential sources of the instability. Graphical Abstract