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首页> 外文期刊>The European physical journal, E. Soft matter >The mechanism of the attracting acoustic radiation force on a polymer-coated gold sphere in plane progressive waves
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The mechanism of the attracting acoustic radiation force on a polymer-coated gold sphere in plane progressive waves

机译：平面渐进波中聚合物涂层金球上的声辐射力吸引机理

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摘要

Acoustic plane progressive waves incident on a sphere immersed in a nonviscous fluid exert a steady force acting along the direction of wave motion. It is shown here that when an elastic gold sphere is coated with a polymer-type (polyethylene) viscoelastic layer, this force becomes a force of attraction in the long wavelength limit. Kinetic, potential and Reynolds stress energy densities are defined and evaluated with and in the absence of absorption in the layer. Without absorption, the mechanical energy density counteracts the Reynolds stress energy density, which causes a repulsive force. However, in the case of absorption, the attractive force is predicted to be a physical consequence of a mutual contribution of both the mechanical and the Reynolds stress energy densities. This condition provides an impetus for further designing acoustic tweezers operating with plane progressive waves as well as fabricating polymer-coated gold particles for specific biophysical and biomedical applications.
机译：入射在浸没在非粘性流体中的球体上的声平面渐进波会沿着波的运动方向施加稳定的力。在此示出，当弹性金球被聚合物型（聚乙烯）粘弹性层覆盖时，该力成为在长波长范围内的吸引力。在有无吸收的情况下，定义和评估动力学，势能和雷诺应力能密度。在没有吸收的情况下，机械能密度会抵消雷诺应力能密度，从而引起排斥力。但是，在吸收的情况下，吸引力是机械力和雷诺应力能密度共同作用的物理结果。这种条件为进一步设计用平面渐进波工作的声镊以及为特定的生物物理和生物医学应用制造聚合物涂覆的金颗粒提供了动力。

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