Probing the Non-Gaussianity in Confined Diffusion of Nanoparticles

Abstract eng:
Confined diffilsion is ubiquitous in nature. Ever since the “anomalous yet Brownian” motion was observed, the non- Gaussianity in confined diffilsion has been unveiled as an important issue. In this study, we experimentally investigate the characteristics and source of non-Gaussian behavior in confined diffilsion of nanoparticles suspended in polymer solutions. A time-varied and size- dependent non-Gaussianity is reported based on non-Gaussian parameter and displacement probability distribution, especially when the nanoparticle’s size is smaller than the typical polymer mesh size. The main source of the non-Gaussianity can therefore be attributed to hopping diffilsion that results in an exponential probability distribution with the large displacements

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