各向同性/近晶-A中间相转变中均匀取向球晶的形状动力学生长、结构和弹性
Shape-dynamic growth, structure, and elasticity of homogeneously oriented spherulites in an isotropic/smectic-A mesophase transition
摘要：
采用Landau-de Gennes模型，结合四极张量序参量和复近晶-A序参量，模拟了初始均质近晶-A球晶在各向同性基质中的二维生长.这些模拟是在两种材料条件下进行的形状动态（纳米尺度）生长制度：各向同性弹性和等展曲弯曲弹性。这两种情况之间的生长动力学，球晶形态，界面/体能量景观的比较表明，相等的展曲弯曲弹性是需要重现过去的实验和理论观察。此外，一个以前未知的波动不稳定性，在球晶生长过程中发现，结合优选的平面锚定和缺陷脱落机制在微米级的长度尺度，可以解释焦锥曲率缺陷的形成机制，并最终近晶-A的“接力棒”结构实验观察。
英文摘要：
A Landau-de Gennes model that integrates the nematic quadrupolar tensor order parameter and complex smectic-A order parameters is used to simulate the two-dimensional growth of an initially homogeneous smectic-A spherulite in an isotropic matrix. These simulations are performed in the shape-dynamic (nano-scale) regime of growth under two material conditions: isotropic nematic elasticity and equal splay-bend nematic elasticity. A comparison of the growth kinetics, spherulite morphology, interfacial/bulk energy landscapes between both cases is made showing that equal nematic splay-bend elasticity is required to reproduce past experimental and theoretical observations. Additionally, a previously unknown undulation instability during spherulite growth is found which, in conjunction with preferred planar anchoring and defect shedding mechanisms at micron length scales, could explain the formation mechanism of focal conic curvature defects and ultimately smectic-A "batonnet" structures observed experimentally.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
