This article reveals how apparently similar looking nano-particles with same size, shape and mass may exhibit widely varying Brownian diffusivity due to inherent features of nano-scale dynamics. Such variabilities may, in certain cases, reach order of magnitude fluctuations depending on the interfacial and bulk properties of the Brownian body. Accordingly, the theory explains several unanswered questions in connection to submicron systems including anomalous thermal properties of nano-fluids and strangely varying transmittivities of biologically originated particulate droplets.

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