Controlling the Accumulation of Water at Oil-Solid Interfaces with Gradient Coating | |
Department | 固体润滑国家重点实验室 |
Li, Yan1; Yang, Qiaomu1; Ran Andy Mei1,3; Cai MR(蔡美荣)2; Jerry Y. Y. Heng3; Yang, Zhongqiang1 | |
2017 | |
Source Publication | Journal of Physical Chemistry B |
ISSN | 1520-6106 |
Volume | 121Issue:27Pages:6766-6772 |
Abstract | In this work, we demonstrate a strategy to control the accumulation of water in the oil–solid interface using a gradient coating. Gradient chemistry on glass surface is created by vapor diffusion of organosilanes, leading to a range of contact angles from 110 to 20°. Hexadecane is placed on the gradient substrate as an oil layer, forming a “water/hexadecane/gradient solid substrate” sandwich structure. During incubation, water molecules spontaneously migrate through the micrometer-thick oil layer and result in the formation of micrometer-sized water droplets at the oil–solid interface. It turns out that water droplets at more hydrophobic regions tend to be closer to a regular spherical shape, which is attributed to their higher contact angle with the hydrophobic substrate. However, along the gradient from hydrophobic to hydrophilic, the water droplets gradually form more irregular shapes, as hydrophilic surfaces pin the edges of droplets to form a distorted morphology. It indicates that more hydrophilic surfaces containing more Si–OH groups lead to a higher electrostatic interaction with water and a higher growth rate of interfacial water droplets. This work provides further insights into the mechanism of spontaneous water accumulation at oil–solid interfaces and assists in the rational design for controlling such interfacial phenomenon. |
Subject Area | 材料科学与物理化学 |
DOI | 10.1021/acs.jpcb.7b05062 |
Funding Organization | the National Natural Science Foundation of China (21474059;21421064);the National Basic Research Program of China (2013CB932803) |
Indexed By | SCI |
If | 3.177 |
Language | 英语 |
Funding Project | 材料表面界面研究组 |
compositor | 第二作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/22198 |
Collection | 固体润滑国家重点实验室(LSL) |
Corresponding Author | Yang, Zhongqiang |
Affiliation | 1.Tsinghua Univ, Dept Chem, Minist Educ, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R China 2.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China 3.Imperial Coll London, Dept Chem Engn, South Kensington Campus, London SW7 2AZ, England |
Recommended Citation GB/T 7714 | Li, Yan,Yang, Qiaomu,Ran Andy Mei,et al. Controlling the Accumulation of Water at Oil-Solid Interfaces with Gradient Coating[J]. Journal of Physical Chemistry B,2017,121(27):6766-6772. |
APA | Li, Yan,Yang, Qiaomu,Ran Andy Mei,Cai MR,Jerry Y. Y. Heng,&Yang, Zhongqiang.(2017).Controlling the Accumulation of Water at Oil-Solid Interfaces with Gradient Coating.Journal of Physical Chemistry B,121(27),6766-6772. |
MLA | Li, Yan,et al."Controlling the Accumulation of Water at Oil-Solid Interfaces with Gradient Coating".Journal of Physical Chemistry B 121.27(2017):6766-6772. |
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acs.jpcb.7b05062.pdf(3771KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text |
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