Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States.
Langmuir. 2012 Jun 26;28(25):9181-8. doi: 10.1021/la300292r. Epub 2012 Jun 12.
Single-particle tracking with real-time feedback control can be used to study three-dimensional nanoparticle transport dynamics. We apply the method to study the behavior of adsorbed nanoparticles at a silicone oil-water interface in a microemulsion system over a range of particles sizes from 24 nm to 2000 nm. The diffusion coefficient of large particles (>200 nm) scales inversely with particle size, while smaller particles exhibit an unexpected increase in drag force at the interface. The technique can be applied in the future to study three-dimensional dynamics in a range of systems, including complex fluids, gels, biological cells, and geological media.
利用实时反馈控制的单粒子跟踪技术可用于研究三维纳米颗粒的输运动力学。我们将该方法应用于研究在微乳液体系中，硅油-水界面上吸附纳米颗粒的行为，研究的颗粒尺寸范围从 24nm 到 2000nm。大颗粒（>200nm）的扩散系数与颗粒尺寸成反比，而较小的颗粒在界面上表现出反常的阻力增加。该技术可应用于未来一系列体系的三维动力学研究，包括复杂流体、凝胶、生物细胞和地质介质。
