Brownian motion is the stochastic, irregular movement of microscopic particles suspended in a fluid, arising from incessant bombardment by thermally agitated solvent molecules. Phenomenologically, it is modeled as a continuous-time random walk with independent, normally distributed increments and stationary variance proportional to time, and in the limit as time steps go to zero, it is described by a Wiener process. As a physical phenomenon, Brownian motion underlies diffusion, is characterized quantitatively by the diffusion coefficient via the Einstein relation, and plays a fundamental role in nonequilibrium statistical mechanics and fluctuation phenomena in condensed matter systems.
Based on the principle of interaction between matter and light, a new method has been developed to track and observe the Brownian motion of fast-moving nanometer-sized molecules, and measure the different fluorescence signals ...
Nanomaterials
Jul 27, 2021
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