【摘 要】
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The capability to control and move nanoparticles on demand has attracted tremendous scientific interest and is of great technological significance for different application field from nanomotor to nan
【机 构】
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Paul C.Lauterbur Research Center for Biomedical Imaging,Institute of Biomedical and Health Engineeri
【出 处】
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中国微米纳米技术学会纳米科学技术分会第四届年会暨2016国际纳米生物与医学学术会议
论文部分内容阅读
The capability to control and move nanoparticles on demand has attracted tremendous scientific interest and is of great technological significance for different application field from nanomotor to nanomedicine[1,2].As a non-invasive and non-contact manipulation method,acoustic trapping has the advantage that it is able to simply levitate many kinds of objects from small living animal to bacteria[3,4].However,when the particle size reduces to nanoscale,the acoustic force decreases rapidly,and Brownian motion of the particles by the collisions with water molecules increases significantly.Thus,trapping nanoparticles requires much higher frequency and acoustic intensity.Unfortunately,acoustic probes with high frequency such as hundreds of MHz or even more frequencies are difficult to implement.Meanwhile,the energy of high-frequency waves is found to be obviously attenuation in the transmission.In addition,acoustic streaming could be induced by high acoustic intensities,resulting in instability of the trapping.All these factors have made the acoustic manipulation of nanoparticles where all the structural dimensions are much smaller than the acoustic wavelength to be extremely challenging.
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