Colloidal transport and diffusion over a tilted periodic potential: Dynamics of individual particles

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题名:	Colloidal transport and diffusion over a tilted periodic potential: Dynamics of individual particles
作者:	黎璧賢;Ma, Xiao-guang;Lai, Pik-Yin;Ackerson, Bruce J;Tong, Penger
贡献者:	理學院物理學系
关键词:	Barriers;Colloids;Diffusion;Diffusion coefficient;Diffusion layers;Drift;Dynamical systems;Dynamics
日期:	2015-02-14
上传时间:	2026-04-23 11:47:20 (UTC+8)
出版者:	Royal Society of Chemistry;England
摘要:	摘要： A tilted two-layer colloidal system is constructed for the study of force-assisted barrier-crossing dynamics over a periodic potential. The periodic potential is provided by the bottom layer colloidal spheres forming a fixed crystalline pattern on a glass substrate. The corrugated surface of the bottom colloidal crystal provides a gravitational potential field for the top layer diffusing particles. By tilting the sample at an angle with respect to the vertical (gravity) direction, a tangential component of the gravitational force F is applied to the diffusing particles. The measured mean drift velocity v( F , E b ) and diffusion coefficient D ( F , E b ) of the particles as a function of F and energy barrier height E b agree well with the exact results of the one-dimensional drift velocity (R. L. Stratonovich, Radiotekh. Elektron , 1958, 3 , 497) and diffusion coefficient (P. Reimann, et al. , Phys. Rev. Lett. , 2001, 87 , 010602 and P. Reimann, et al. , Phys. Rev. E , 2002, 65 , 031104). Based on these exact results, we show analytically and verify experimentally that there exists a scaling region, in which v( F , E b ) and D ( F , E b ) both scale as ν ′( F )exp[− E * b ( F )/ k B T ], where the Arrhenius pre-factor ν ′( F ) and effective barrier height E * b ( F ) are both modified by F . The experiment demonstrates the applications of this model system in evaluating different scaling forms of ν ′( F ) and E * b ( F ) and their accuracy, in order to extract useful information about the external potential, such as the intrinsic barrier height E b . A tilted two-layer colloidal system is constructed for the study of force-assisted barrier-crossing dynamics over a periodic potential. The periodic potential is provided by the bottom layer colloidal spheres forming a fixed crystalline pattern on a glass substrate. 其他題名： Soft Matter 出版者： England 出版日期： 2015-02-14 出處： Soft matter, 2015-02, Vol.11 (6), p.1182-1196 識別號： ISSN: 1744-683X 識別號： ISSN: 1744-6848 識別號： EISSN: 1744-6848 識別號： DOI: 10.1039/c4sm02387k 識別號： PMID: 25562695
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