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Surface pressure anisotropy and complex relaxation of silica nanoparticle monolayer at the air-water interface

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Abstract

We report the anisotropy effect and the relaxation dynamics of surface pressure of silica nanoparticle monolayer at the air-water interface. The anisotropy of surface pressure occurs when the water surface is fully covered by particles and becomes more prominent with the increase of surface concentration. Hence, the conception of surface tensor was proposed to characterize the monolayer properties. The dynamics of pressure relaxation involves three timescales which are related to the damping of surface fluctuation, rearrangement of particle rafts and particle motion inside each raft. The anisotropy decays when the layer is kept static and the process is accelerated remarkably by barrier oscillation. The underlying physics mechanism is also discussed in detail for the origin of pressure anisotropy and its decay dynamics.

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Authors and Affiliations

  1. Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi’an, 710072, China

    DuYang Zang

  2. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    YongJian Zhang

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  1. DuYang Zang
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  2. YongJian Zhang
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Correspondence to DuYang Zang.

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Zang, D., Zhang, Y. Surface pressure anisotropy and complex relaxation of silica nanoparticle monolayer at the air-water interface. Sci. China Phys. Mech. Astron. 54, 1587 (2011). https://doi.org/10.1007/s11433-011-4451-5

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  • DOI: https://doi.org/10.1007/s11433-011-4451-5

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