Growth dynamics of nanoplatelet liquid crystals by directionally drying colloidal suspensions in a confined channel

doi:10.1063/5.0074668

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Growth dynamics of nanoplatelet liquid crystals by directionally drying colloidal suspensions in a confined channel
	Sui JZ(隋济泽)
刊名	PHYSICS OF FLUIDS
	2021-12-01
卷号	33 期号:12 页码:13
ISSN号	1070-6631
DOI	10.1063/5.0074668
通讯作者	Sui, Jize(suijize@imech.ac.cn)
英文摘要	Unidirectional solvent evaporation has been increasingly concerned as a versatile microfluidic agent in manipulating the self-assembly dynamics of shape anisotropic colloids by precisely governing a confined nanofluid flow in a microcell. Here we develop a theoretical framework upon unidirectional drying-induced growth of nematic liquid crystals (LC) in nanoplatelet suspension confined to a Hele-Shaw (H-S) channel. The nematic order-dependent permeability assembled in modified Darcy's law and the interactions between nanoplatelets for nematic LC are both explicitly incorporated in a confined nanofluid flow. The growth dynamics of nematic LC that is highly correlated with drying rate (drying Peclet number), nanoplatelet aspect ratio, and geometric confinement have been rationalized by our numerical measurements. Unlike the spherical colloids, the nematic LC grows nonlinearly over time indicating a time-dependent instantaneous growth velocity. The final length of LC, when subjected to an enhanced drying rate, is seen to be compressed toward the drying end, but its time-averaged growth velocity increases significantly. Besides, the LC formed by the thicker nanoplatelets gets the shorter final length, while whether its average growth velocity is affected by nanoplatelet types depends on the drying rate. Importantly, we confirm a noticeable promotion in the growth of LC as the enhanced geometric confinement is imposed. A state diagram we produce suggests a universal signature of enhancement in solvent drying flux with enhanced confinement. However, our results highlight the favorable water retention in nanoplatelet nematic LC with compacted layered architecture prevailing over the spherical colloids deposits with the porous percolation architecture.
分类号	一类/力学重要期刊
资助项目	National Natural Science Foundation of China for Young Scientists[21903003]
WOS关键词	FILMS ; SOLIDIFICATION ; EVAPORATION ; KINETICS ; FRONTS ; RING ; FLOW
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:000729291000001
资助机构	National Natural Science Foundation of China for Young Scientists
其他责任者	Sui, Jize
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87978]
专题	力学研究所_非线性力学国家重点实验室
作者单位	Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Sui JZ. Growth dynamics of nanoplatelet liquid crystals by directionally drying colloidal suspensions in a confined channel[J]. PHYSICS OF FLUIDS,2021,33(12):13.
APA	隋济泽.(2021).Growth dynamics of nanoplatelet liquid crystals by directionally drying colloidal suspensions in a confined channel.PHYSICS OF FLUIDS,33(12),13.
MLA	隋济泽."Growth dynamics of nanoplatelet liquid crystals by directionally drying colloidal suspensions in a confined channel".PHYSICS OF FLUIDS 33.12(2021):13.