SUPA, School of Physics and Astronomy, University of St. Andrews , North Haugh, St. Andrews KY16 9SS, United Kingdom.
Molecular Chirality Research Center, Graduate School of Advanced Integration Science, Chiba University , 1-33 Yayoi, Inage, Chiba 263-0022, Japan.
ACS Nano. 2016 Dec 27;10(12):11505-11510. doi: 10.1021/acsnano.6b07290. Epub 2016 Dec 14.
We synthesize, optically trap, and rotate individual nanovaterite crystals with a mean particle radius of 423 nm. Rotation rates of up to 4.9 kHz in heavy water are recorded. Laser-induced heating due to residual absorption of the nanovaterite particle results in the superlinear behavior of the rotation rate as a function of trap power. A finite element method based on the Navier-Stokes model for the system allows us to determine the residual optical absorption coefficient for a trapped nanovaterite particle. This is further confirmed by the theoretical model. Our data show that the translational Stokes drag force and rotational Stokes drag torque need to be modified with appropriate correction factors to account for the power dissipated by the nanoparticle.
我们合成、光学捕获和旋转单个纳米文石晶体，其平均粒径为 423nm。在重水中记录到高达 4.9kHz 的旋转速率。由于纳米文石颗粒的残余吸收，激光诱导加热导致旋转速率的超线性行为与陷阱功率有关。基于纳维-斯托克斯模型的有限元方法允许我们确定被捕获的纳米文石颗粒的残余光吸收系数。这进一步得到了理论模型的证实。我们的数据表明，需要用适当的修正因子来修正平移斯托克斯曳力和旋转斯托克斯曳力矩，以考虑纳米颗粒耗散的功率。
