氣泡推進型中空J(rèn)anus微球運動特性的實驗研究
發(fā)布時間：2018-08-02 10:34
【摘要】：本文通過Pt-SiO_2型(鉑-二氧化硅型)中空J(rèn)anus微球在低濃度2%~4%H_2O_2溶液中的氣泡驅(qū)動實驗,觀察到在每個氣泡生長-潰滅周期內(nèi),Janus微球的運動呈現(xiàn)3個特征階段,分別為自擴散泳、氣泡生長和氣泡潰滅。其中氣泡潰滅階段微球在射流驅(qū)動下的推進速度可達每秒幾十毫米,比前2個階段的平均速度大2~3個數(shù)量級。實驗觀察到氣泡生長階段其半徑與時間存在Rb~t1/3和Rb~t1/2兩種標(biāo)度率。由于氣泡在Janus微球催化劑表面(Pt側(cè))的生長點偏離對稱軸位置,Janus微球的運動軌跡呈圓周形。隨H_2O_2溶液濃度的增加,還可以進一步提高Janus微球的運動速度。此研究不僅定量分析了Janus微球的運動特性,而且為實際應(yīng)用中提高Janus雙面微馬達的運動速度和能量利用率提供了參考依據(jù)。
[Abstract]:In this paper, the bubble driving experiments of Pt-SiO_2 hollow Janus microspheres in low concentration 2%~4%H_2O_2 solution are carried out. It is observed that there are three characteristic stages of the motion of Pt-SiO_2 microspheres in each bubble growth and collapse cycle, which are self-diffusion swimming. Bubble growth and bubble collapse. The propelling speed of the microspheres driven by the jet can reach tens of millimeters per second in the bubble collapse stage, which is 2 ~ 3 orders of magnitude higher than the average velocity of the first two stages. It is observed that there are two scaling rates, Rb~t1/3 and Rb~t1/2, for the radius and time of bubble growth. Because the growth point of bubbles on the surface of Janus microspheres (Pt side) deviates from the symmetry axis, the trajectory of Janus microspheres is circular. With the increase of the concentration of H_2O_2 solution, the velocity of Janus microspheres can be further increased. This study not only quantitatively analyzes the motion characteristics of Janus microspheres, but also provides a reference for improving the speed of motion and energy utilization of Janus double-sided micromotors in practical application.
【作者單位】： 西安建筑科技大學(xué)環(huán)境與市政工程學(xué)院;中國科學(xué)院力學(xué)研究所;
【基金】：國家自然科學(xué)基金(11572335,11272322,11672358) 陜西省教育廳重點實驗室項目(15JS045)
【分類號】：O347.7
本文編號：2159147
[Abstract]:In this paper, the bubble driving experiments of Pt-SiO_2 hollow Janus microspheres in low concentration 2%~4%H_2O_2 solution are carried out. It is observed that there are three characteristic stages of the motion of Pt-SiO_2 microspheres in each bubble growth and collapse cycle, which are self-diffusion swimming. Bubble growth and bubble collapse. The propelling speed of the microspheres driven by the jet can reach tens of millimeters per second in the bubble collapse stage, which is 2 ~ 3 orders of magnitude higher than the average velocity of the first two stages. It is observed that there are two scaling rates, Rb~t1/3 and Rb~t1/2, for the radius and time of bubble growth. Because the growth point of bubbles on the surface of Janus microspheres (Pt side) deviates from the symmetry axis, the trajectory of Janus microspheres is circular. With the increase of the concentration of H_2O_2 solution, the velocity of Janus microspheres can be further increased. This study not only quantitatively analyzes the motion characteristics of Janus microspheres, but also provides a reference for improving the speed of motion and energy utilization of Janus double-sided micromotors in practical application.
【作者單位】： 西安建筑科技大學(xué)環(huán)境與市政工程學(xué)院;中國科學(xué)院力學(xué)研究所;
【基金】：國家自然科學(xué)基金(11572335,11272322,11672358) 陜西省教育廳重點實驗室項目(15JS045)
【分類號】：O347.7
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