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Translational thermophoresis and rotational movement of peanut-like colloids under temperature gradient

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Abstract

Thermophoresis can be used for particle manipulation and separation in microfluidics. This work reports an experimental investigation on thermophoresis and the associated rotational patterns of dilute peanut-like colloids in DI water and SDS surfactant solutions. A microfluidic device is utilized for generating a linear temperature gradient and for directly visualizing the thermophoretic motion and rotation of peanut-like particles. Thermophilic behavior was observed for the peanut-like particles, and their thermophoretic mobilities were found smaller than those of the spherical particles of similar sizes. The peanut-like particles’ rotation characterized by the rotational diffusion coefficient is found to be free diffusive dominated. A very small orientation order toward a preferred direction is distinguished along with the random Brownian rotation.

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Acknowledgments

This work was financially supported by Academic Research Fund (MOE2009-T2-2-102) from the Ministry of Education of Singapore, National Natural Science Foundation of China (Nos. 51322603, 51356001, 51136001), Science Fund for Creative Research Groups (No. 51321002), Program for New Century Excellent Talents in University, Tsinghua Scholarship for Overseas Graduate Studies and the Tsinghua National Laboratory for Information Science and Technology of China (TNList).

Conflict of interest

This work declares no conflicts of interest and the research involves no Human Participants and/or Animals.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore

    Ruo-Yu Dong, Yi Zhou & Chun Yang

  2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, People’s Republic of China

    Ruo-Yu Dong & Bing-Yang Cao

Authors
  1. Ruo-Yu Dong
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  2. Yi Zhou
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  3. Chun Yang
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  4. Bing-Yang Cao
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Correspondence to Bing-Yang Cao.

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Dong, RY., Zhou, Y., Yang, C. et al. Translational thermophoresis and rotational movement of peanut-like colloids under temperature gradient. Microfluid Nanofluid 19, 805–811 (2015). https://doi.org/10.1007/s10404-015-1605-1

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  • DOI: https://doi.org/10.1007/s10404-015-1605-1

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