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Diffusion of Nanoparticles with Activated Hopping in Crowded Polymer Solutions

文献类型：期刊论文

作者Xue CD; Shi XH; Tian Y; Zheng X(郑旭); Hu GQ
刊名NANO LETTERS
出版日期2020-05-13
卷号20期号:5页码:3895-3904
关键词hopping diffusion DYNAMICS non-Gaussianity MOBILITY activated energy barrier ULTRASOUND crowded polymer solutions CHEMISTRY VISCOSITY ROTATION NANORODS
ISSN号1530-6984
DOI10.1021/acs.nanolett.0c01058
英文摘要A long-distance hop of diffusive nanoparticles (NPs) in crowded environments was commonly considered unlikely, and its characteristics remain unclear. In this work, we experimentally identify the occurrence of the intermittent hops of large NPs in crowded entangled poly(ethylene oxide) (PEO) solutions, which are attributed to thermally induced activated hopping. We show that the diffusion of NPs in crowded solutions is considered as a superposition of the activated hopping and the reptation of the polymer solution. Such activated hopping becomes significant when either the PEO molecular weight is large enough or the NP size is relatively small. We reveal that the time-dependent non-Gaussianity of the NP diffusion is determined by the competition of the short-time relaxation of a polymer entanglement strand, the activated hopping, and the long-time reptation. We propose an exponential scaling law tau(hop)/tau(e) similar to exp(d/d(t)) to characterize the hopping time scale, suggesting a linear dependence of the activated hopping energy barrier on the dimensionless NP size. The activated hopping motion can only be observed between the onset time scale of the short-time relaxation of local entanglement strands and the termination time scale of the long-time relaxation. Our findings on activated hopping provide new insights into long-distance transportation of NPs in crowded biological environments, which is essential to the delivery and targeting of nanomedicines.
分类号一类
WOS研究方向Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种英语
WOS记录号WOS:000535255300125
资助机构Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [11832017, 11572335, 11572334, 11802054} ; Chinese Academy of Sciences Key Research Program of Frontier Sciences [QYZDB-SSW-JSC036} ; Chinese Academy of Sciences Strategic Priority Research Program [XDB22040403} ; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2019M651106}
其他责任者Hu, GQ ; Zheng, X
源URL[http://dspace.imech.ac.cn/handle/311007/85408]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.{Tian Yu} Tsinghua Univ State Key Lab Tribol Beijing 100084 Peoples R China
2.{Shi Xinghua} Natl Ctr Nanosci & Technol China Beijing 100190 Peoples R China
3.{Xue Chundong, Shi Xinghua} Univ Chinese Acad Sci Beijing 100149 Peoples R China
4.{Xue Chundong} Dalian Univ Technol Sch Optoelect Engn & Instrumentat Sci Dalian 116024 Liaoning Peoples R China
5.{Xue Chundong, Zheng Xu} Chinese Acad Sci State Key Lab Nonlinear Mech Inst Mech Beijing 100190 Peoples R China
6.{Hu Guoqing} Zhejiang Univ State Key Lab Fluid Power & Mechatron Syst Hangzhou 310027 Zhejiang Peoples R China
7.{Hu Guoqing} Zhejiang Univ Dept Engn Mech Hangzhou 310027 Zhejiang Peoples R China
推荐引用方式
GB/T 7714		 Xue CD,Shi XH,Tian Y,et al. Diffusion of Nanoparticles with Activated Hopping in Crowded Polymer Solutions[J]. NANO LETTERS,2020,20(5):3895-3904.
APA Xue CD,Shi XH,Tian Y,郑旭,&Hu GQ.(2020).Diffusion of Nanoparticles with Activated Hopping in Crowded Polymer Solutions.NANO LETTERS,20(5),3895-3904.
MLA Xue CD,et al."Diffusion of Nanoparticles with Activated Hopping in Crowded Polymer Solutions".NANO LETTERS 20.5(2020):3895-3904.

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来源：力学研究所

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