Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States.
Samuel Ginn Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, United States.
Langmuir. 2020 May 12;36(18):4975-4984. doi: 10.1021/acs.langmuir.0c00508. Epub 2020 Apr 30.
A Landau-de Gennes formulation coupled with a mass-transfer equation was used to track the evaporation front and the development of chiral microstructures during the casting of sulfuric acid-hydrolyzed cellulose nanocrystal (CNC) films. These simulations are compared to thin-film casting experiments that used analogous processing parameters and environments. The results show that the initial concentration, chiral strength, surface anchoring, speed of drying, and the influence of initial shear alignment all affect the uniformity of the microstructure and the orientation of the chiral director. In this report, we aim to show that under optimal casting conditions, the lateral size of planar microstructural domains that exhibit uniform selective reflection can be achieved on the order of millimeters.
采用朗道-德让方程结合传质方程来跟踪蒸发前沿和硫酸水解纤维素纳米晶体（CNC）薄膜铸造过程中手性微结构的发展。这些模拟结果与使用类似工艺参数和环境的薄膜铸造实验进行了比较。结果表明，初始浓度、手性强度、表面锚定、干燥速度以及初始剪切对准的影响都会影响微结构的均匀性和手性导向的方向。在本报告中，我们旨在表明，在最佳的铸造条件下，具有均匀选择性反射的平面微结构域的横向尺寸可以达到毫米量级。
