Charged Nanoparticles Quench the Propulsion of Active Janus Colloids
Charged Nanoparticles Quench the Propulsion of Active Janus Colloids
复制标题
带电纳米粒子抑制活性 Janus 胶体的推进
DOI：
10.1021/acsomega.9b00765
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发表时间：
2019
期刊：
影响因子：
4.1
通讯作者：
Wirth, Christopher L.
中科院分区：
文献类型：
--
作者：
Issa, Marola W.;Baumgartner, Nicky R.;Kalil, Mohammed A.;Ryan, Shawn D.;Wirth, Christopher L.
在从微流体到传感的应用中，活性胶体颗粒经常与表面相互作用。最近的工作揭示了活性粒子的这些表面相互作用的复杂性质。在这里，我们总结了实验和模拟，显示带电纳米颗粒对边界附近活性胶体的推进的影响。添加带电纳米颗粒不仅由于预期的耗尽吸引力而降低了被动胶体的平均分离距离，而且还将 Janus 胶体的表观推进力降低到接近零。在从实验推断的分离距离范围内进行了基于补充剂的模拟，考虑了流体动力学对活性 Janus 胶体的影响。这些模拟表明，推进速度随着平均间隔距离的减小而单调减小。尽管实验和模拟发现的趋势在定性上一致，但速度降低的幅度仍然存在显着差异。定量差异归因于带电纳米颗粒对活性颗粒悬浮液电导率的影响。后续实验描述了耗尽和电导率的影响，表明两者都会导致活跃的两面神粒子的速度降低。实验和模拟数据表明，有必要考虑影响边界附近活性粒子相互作用的各种机制之间的协同效应。
Active colloidal particles regularly interact with surfaces in applications ranging from microfluidics to sensing. Recent work has revealed the complex nature of these surface interactions for active particles. Herein, we summarize experiments and simulations that show the impact of charged nanoparticles on the propulsion of an active colloid near a boundary. Adding charged nanoparticles not only decreased the average separation distance of a passive colloid because of depletion attraction as expected but also decreased the apparent propulsion of a Janus colloid to near zero. Complementary agent-based simulations considering the impact of hydrodynamics for active Janus colloids were conducted in the range of separation distances inferred from experiment. These simulations showed that propulsion speed decreased monotonically with decreasing average separation distance. Although the trend found in experiments and simulations was in qualitative agreement, there was still a significant difference in the magnitude of speed reduction. The quantitative difference was attributed to the influence of charged nanoparticles on the conductivity of the active particle suspension. Follow-up experiments delineating the impact of depletion and conductivity showed that both contribute to the reduction of speed for an active Janus particle. The experimental and simulated data suggests that it is necessary to consider the synergistic effects between various mechanisms influencing interactions experienced by an active particle near a boundary.
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DOI：
10.1063/1.4994843
发表时间：
2017-12
期刊：
The Journal of chemical physics
影响因子：
--
作者：
Aidin Rashidi;C. Wirth
通讯作者：
Aidin Rashidi;C. Wirth
影响因子：
8.6
作者：
Cui, BX;Diamant, H;Rice, SA
通讯作者：
Rice, SA
影响因子：
2.4
作者：
Ariel, Gil;Sidortsov, Marina;Be'er, Avraham
通讯作者：
Be'er, Avraham
影响因子：
15
作者：
Kagan, Daniel;Calvo-Marzal, Percy;Balasubramanian, Shankar;Sattayasamitsathit, Sirilak;Manesh, Kalayil Manian;Flechsig, Gerd-Uwe;Wang, Joseph
通讯作者：
Wang, Joseph
影响因子：
2.4
作者：
Ebbens, Stephen;Tu, Mei-Hsien;Golestanian, Ramin
通讯作者：
Golestanian, Ramin