论文标题
用于同时测量旋转和翻译扩散的球形探针在3维
Spherical probes for simultaneous measurement of rotational and translational diffusion in 3 dimensions
论文作者
论文摘要
具有3D分辨率的胶体颗粒的实时可视化和跟踪对于探测复杂流体中的局部结构和动态至关重要。尽管跟踪球形胶体的翻译运动是众所周知的，但访问此类颗粒的旋转动力学仍然是一个巨大的挑战。在这里，我们报告了一种新的方法，该方法是使用荧光标记的覆盆子样胶体，并具有光学各向异性，以同时跟踪3个维度的转化和旋转动力学。覆盆子状颗粒被可调节厚度的二氧化硅覆盖，从而可以调节表面粗糙度。提出方法的综合和适用性通过两种类型的探针证明：粗糙和平滑。通过使用分散在2种不同溶剂中的这2个探针，还证明了测量平方平方（角）位移的精度。提出的3D可跟踪胶体为广泛的应用和研究提供了很高的潜力，例如探测结晶动力学，相变和表面粗糙度对扩散的影响。
Real time visualization and tracking of colloidal particles with 3D resolution is essential for probing the local structure and dynamics in complex fluids. Although tracking translational motion of spherical colloids is well-known, accessing rotational dynamics of such particles remains a great challenge. Here, we report a novel approach of using fluorescently labeled raspberry-like colloids with an optical anisotropy to concurrently track translational and rotational dynamics in 3 dimensions. The raspberry-like particles are coated by a silica layer of adjustable thickness, which allows tuning the surface roughness. The synthesis and applicability of the proposed method is demonstrated by two types of probes: rough and smoothened. The accuracy of measuring Mean Squared (Angular) Displacements are also demonstrated by using these 2 probes dispersed in 2 different solvents. The presented 3D trackable colloids offer a high potential for wide range of applications and studies, such as probing crystallization dynamics, phase transitions and the effect of surface roughness on diffusion.
