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Surface hydrophilicity mediated migration of nano/microparticles under temperature gradient in a confined space

文献类型：期刊论文

作者Xu, Haolan1; Zheng X(郑旭); Shi XH(施兴华)
刊名JOURNAL OF COLLOID AND INTERFACE SCIENCE
出版日期2023-05
卷号637页码:489-499
关键词Thermophoresis Thermo osmosis Soret coefficient Hydrophobicity Nanoparticle
ISSN号0021-9797
DOI10.1016/j.jcis.2023.01.112
英文摘要Hypothesis: Particle transport by a temperature gradient is prospective in many biomedical applications. However, the prevalence of boundary confinement in practical use introduces synergistic effects of thermophoresis and thermo osmosis, causing controversial phenomena and great difficulty in understanding the mechanisms. Experiments: We developed a microfluidic chip with a uniform temperature gradient and switchable sub strate hydrophilicity to measure the migrations of various particles (d = 200 nm 2 lm), through which the effects of particle thermophoresis and thermo osmotic flow from the substrate surface were decou pled. The contribution of substrate hydrophilicity on thermo osmosis was examined. Thermophoresis was measured to clarify its dependence on particle size and hydrophilicity. Findings: This paper reports the first experimental evidence of a large enthalpy dependent thermo osmotic mobility chi similar to Delta H on a hydrophobic polymer surface, which is 1 2 orders of magnitude larger than that on hydrophilic surfaces. The normalized Soret coefficient for polystyrene particles, ST/ d = 18.0 K 1 mu m( 1), is confirmed to be constant, which helps clarify the controversy of the size dependence. Besides, the Soret coefficient of hydrophobic proteins is approximately four times larger than that of hydrophilic extracellular vesicles. These findings suggest that the intrinsic slip on the hydrophobic surface could enhance both surface thermoosmosis and particle thermophoresis. (c) 2023 Elsevier Inc. All rights reserved.
分类号二类/Q1
WOS研究方向Chemistry, Physical
语种英语
WOS记录号WOS:000927332500001
资助机构Strategic Pri ority Research Program of the Chinese Academy of Sciences [XDB36000000, XDB22040403] ; CAS Key Research Program of Frontier Sciences [QYZDB SSW JSC036] ; Natural Science Foundation of Beijing [2184130, 1202023] ; National Natural Science Foundation of China [11672079, 12072082, 12072350, 11832017, 12125202]
其他责任者Shi, XH (corresponding author), Chinese Acad Sci, CAS Ctr Excellence Nanosci, Natl Ctr Nanosci & Technol, Lab Theoret & Computat Nanosci, Beijing 100190, Peoples R China. ; Zheng, X (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
源URL[http://dspace.imech.ac.cn/handle/311007/91810]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Chinese Acad Sci, CAS Ctr Excellence Nanosci, Natl Ctr Nanosci & Technol, Lab Theoret & Computat Nanosci, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Xu, Haolan,Zheng X,Shi XH. Surface hydrophilicity mediated migration of nano/microparticles under temperature gradient in a confined space[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2023,637:489-499.
APA Xu, Haolan,郑旭,&施兴华.(2023).Surface hydrophilicity mediated migration of nano/microparticles under temperature gradient in a confined space.JOURNAL OF COLLOID AND INTERFACE SCIENCE,637,489-499.
MLA Xu, Haolan,et al."Surface hydrophilicity mediated migration of nano/microparticles under temperature gradient in a confined space".JOURNAL OF COLLOID AND INTERFACE SCIENCE 637(2023):489-499.

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来源：力学研究所

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