Hydrodynamic Process in the Langmuir-Blodgett Film Method

doi:10.1021/acs.langmuir.0c02975

	Hydrodynamic Process in the Langmuir-Blodgett Film Method
	Ji WJ(纪文杰); Zhao WJ ; Li WB(李伟斌); Wang YR(王育人); Wang J ; Lan D(蓝鼎)
刊名	LANGMUIR
	2020-12-01
卷号	36 期号:47 页码:14461-14469
ISSN号	0743-7463
DOI	10.1021/acs.langmuir.0c02975
英文摘要	Preparing organic coatings in a very controlled manner through the spreading of organic molecules on the water surface is one of the emphases for research in Langmuir-Blodgett (LB) technology. For preparing a homogeneous film and improving the quality of the film, it is our concern to have a deeper understanding of the dynamic process involved in spreading. Here, we present an overview of the hydrodynamic process under the influence of assisting the spreading solvent, which mainly focuses on the mechanical mechanisms of related phenomena. A typical spreading experiment of two-component mixed droplets on water substrate for the purpose of preparing LB films was carried out in this research. We perform the spreading of a liquid of silicone oil and oleic acid mixture on the horizontal surface of another immiscible deep water substrate, where the volatile silicone oil is the assisting spreading solvent with low viscosity. We find that it needs to exceed a certain critical value (60% in our experiment) to achieve a uniform and centrosymmetric spreading process, which is a key factor for getting a homogeneous film. We observe that the evolution of a large droplet into liquid film and then into small droplets under the action of surface tension gradient in experiments. Gravity-viscous and surface tension-viscous dominate successively in the whole spreading process, with its spreading radius r(t) proportional to t(1/4) and r(t) proportional to t(3/4), respectively. However, we also obtain singular values of scaling exponents -0.033 and -0.180, which is attributed to nonuniform distribution of the Laplace pressure caused by different curvatures near the capillary wave.
分类号	二类
语种	英语
WOS记录号	WOS:000596728000031
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [U1738118, 11902321, 11472275] ; Strategic Priority Research Program of Chinese Academy of SciencesChinese Academy of Sciences [XDC06050200, XDA17030X00] ; Key R&D Projects of Shandong Province [2019GGX102023]
其他责任者	Lan, D
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/85785]
专题	力学研究所_国家微重力实验室
作者单位	1.{Ji, Wenjie、Li, Weibin、Wang, Yuren、Lan, Ding} Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Key Lab Micrograv, Beijing 100190, Peoples R China 2.{Zhao, Wenjing、Wang, Jin} Qingdao Univ Technol, Sch Mech & Automot Engn, Qingdao 266520, Peoples R China 3.{Ji, Wenjie、Li, Weibin、Wang, Yuren、Lan, Ding} Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Ji WJ,Zhao WJ,Li WB,et al. Hydrodynamic Process in the Langmuir-Blodgett Film Method[J]. LANGMUIR,2020,36(47):14461-14469.
APA	纪文杰,Zhao WJ,李伟斌,王育人,Wang J,&蓝鼎.(2020).Hydrodynamic Process in the Langmuir-Blodgett Film Method.LANGMUIR,36(47),14461-14469.
MLA	纪文杰,et al."Hydrodynamic Process in the Langmuir-Blodgett Film Method".LANGMUIR 36.47(2020):14461-14469.