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我们利用暗场显微镜系统地研究了水剂磁性液体中Fe3O4磁性纳米颗粒在高度聚焦激光作用下的动力学过程.实验研究表明:当激光聚焦在样品池中间时,由于受到沿激光入射方向强散射力和吸收力的作用,磁性纳米颗粒会被排开至光斑的外围;当激光聚焦在样品池上表面时,在光力和样品池上玻片的共同作用下,磁性纳米颗粒会被捕获在样品池的上玻片的下表面并发生团聚效应;此外,我们还研究了不同激光功率作用下形成的磁性纳米团簇对入射白光的透过谱的影响,随着入射激光功率的增加,透过磁性液体的白光的透过率会急剧下降,而且透射谱的中心波长会随着入射激光功率的增加往长波方向移动.
We use dark field microscopy to systematically study the kinetics of Fe3O4 magnetic nanoparticles in liquid magnetic fluid under the condition of highly focused laser.Experimental studies show that when the laser is focused in the middle of the sample cell due to strong scattering along the laser incident direction Force and absorption, the magnetic nanoparticles are released to the periphery of the light spot. When the laser light is focused on the upper surface of the sample cell, the magnetic nanoparticles are trapped in the sample cell by the action of the light force and the sample cell upper glass slide The effect of agglomeration on the lower surface of the upper glass slide was also studied. In addition, we also studied the influence of the magnetic nanoclusters formed under different laser powers on the transmission spectrum of incident white light. With the increase of incident laser power, The transmittance of liquid white light will drop sharply, and the center wavelength of the transmission spectrum will move to the long wavelength direction with the increase of incident laser power.