单个纳米颗粒在圆柱形硅藻壳中的扩散
Diffusion of individual nanoparticles in cylindrical diatom frustule
AI总结：
本文利用单颗粒追踪方法研究单个纳米颗粒在圆柱形硅藻壳内的扩散行为，发现扩散受抑制且存在轴向-径向各向异性，证明SPT是研究硅藻壳内颗粒运动的有力工具。
摘要：
硅藻的特征在于其硅质细胞壁（硅藻壳），具有高度有序的微/纳米结构。由于此类结构的合成仍然具有挑战性，硅藻壳为微/纳米工程中传统多孔颗粒提供了一种有前景的替代方案。特别是对于药物递送系统、生物传感器和过滤器中的应用，理解硅藻内部颗粒运动具有重要意义。在本研究中，我们利用单颗粒追踪（SPT）方法研究了硅藻壳内纳米颗粒（NP）的运动。在这些测量中，纳米颗粒的直径比硅藻壳的直径小约十分之一。在硅藻壳内部，纳米颗粒的扩散运动受到抑制，但这种抑制在硅藻壳出口附近减弱。此外，还观察到硅藻壳轴向与径向之间的扩散各向异性。这种各向异性难以用系综方法检测；因此，SPT方法是研究硅藻壳中纳米颗粒运动的有力手段。
英文摘要：
Diatoms are characterised by silica cell walls (frustules), which have highly ordered micro-/nano-structures. As the synthesis of such structures remains challenging, diatom frustules offer a promissing alternative to conventional porous particles in micro-/nano-engineering. In particular, for applications in drag deliverly systems, biosensors, and filters, an understanding of particle motion inside diatoms is of great impotance. In this study, we investigated nanoparticle (NP) motions inside diatom frustules using the single particle tracking (SPT) method. For these measruements, the diameter of the NP was about one-tenth smaller than that of the frustule. Inside the frustule, the diffusion motions of the NPs were suppressed, but this suppression was weakened near the exit of the frustule. Moreover, diffusion anisotropy between the axial and radial directions of the frustule was observed. This anisotropy is difficult to detect with ensemble methods; thus, the SPT method is a powerful approach for investigating NP motions in frustules.
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