Angular Trapping of Spherical Janus Particles,Small Methods

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Angular Trapping of Spherical Janus Particles
Small Methods ( IF 10.7 ) Pub Date : 2020-09-13 , DOI: 10.1002/smtd.202000565
Xiaoqing Gao _{1,

2} , Yali Wang ₃ , Xuehao He ₃ , Mengjun Xu ₄ , Jintao Zhu ₄ , Xiaodong Hu ₁ , Xiaotang Hu ₁ , Hongbin Li _{1,

2} , Chunguang Hu ₁

Affiliation

Developing angular trapping methods, which enable optical tweezers to rotate a micronsized bead, is of great importance for studies of biomacromolecules in a wide range of torque‐generation processes. Here a novel controlled angular trapping method based on model composite Janus particles is reported, which consist of two hemispheres made of polystyrene and poly(methyl methacrylate). Through computational and experimental studies, the feasibility to control the rotation of a Janus particle in a linearly polarized laser trap is demonstrated. The results show that the Janus particle aligned its two hemispheres interface parallel to the laser propagation direction and polarization direction. The rotational state of the particle can be directly visualized by using a camera. The rotation of the Janus particle in the laser trap can be fully controlled in real time by controlling the laser polarization direction. The newly developed angular trapping technique has the great advantage of easy implementation and real‐time controllability. Considering the easy chemical preparation of Janus particles and implementation of the angular trapping, this novel method has the potential of becoming a general angular trapping method. It is anticipated that this new method will significantly broaden the availability of angular trapping in the biophysics community.

中文翻译：

球形Janus粒子的角度陷印

开发使光镊能够旋转微粒化珠子的角度捕获方法，对于研究大范围扭矩产生过程中的生物大分子至关重要。在此，报道了一种基于模型复合Janus粒子的新型受控角度捕获方法，该方法由聚苯乙烯和聚甲基丙烯酸甲酯制成的两个半球组成。通过计算和实验研究，证明了控制线性偏振激光阱中Janus粒子旋转的可行性。结果表明，Janus粒子的两个半球界面平行于激光传播方向和偏振方向排列。颗粒的旋转状态可以通过使用照相机直接可视化。通过控制激光的偏振方向，可以实时地完全控制Janus粒子在激光阱中的旋转。新开发的角度捕获技术具有易于实现和实时可控性的巨大优势。考虑到Janus颗粒的化学制备简单和角度捕获的实现，这种新方法有可能成为一般的角度捕获方法。可以预料，这种新方法将大大拓宽生物物理学界角捕获的可用性。考虑到Janus颗粒的化学制备简单和角度捕获的实现，这种新方法有可能成为一般的角度捕获方法。可以预料，这种新方法将大大拓宽生物物理学界角捕获的可用性。考虑到Janus颗粒的化学制备简便和角度捕获的实现，这种新方法有可能成为一般的角度捕获方法。可以预料，这种新方法将大大拓宽生物物理学界角捕获的可用性。

更新日期：2020-09-13

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