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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)
Source PublicationLANGMUIR
AbstractPreparing 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.
Indexed BySCI ; EI
WOS IDWOS:000596728000031
Funding OrganizationNational 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]
ContributorLan, D
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Document Type期刊论文
Affiliation1.{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.{Ji, Wenjie、Li, Weibin、Wang, Yuren、Lan, Ding} Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
3.{Zhao, Wenjing、Wang, Jin} Qingdao Univ Technol, Sch Mech & Automot Engn, Qingdao 266520, Peoples R China
Recommended Citation
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.
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