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. 2015 Dec 10;5:17930. doi: 10.1038/srep17930

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Copyright © 2015, Macmillan Publishers Limited

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Diffusive dynamics is observed by XPCS at low concentration and up to . As grows we find an intermediate regime of caged diffusion, with relaxation times growing with. For (vertical line) an arrested regime is reached, in which the only surviving motions are intermittent rearrangements.(a) On the left axis, we report extracted from XPCS at ; different symbols/colors indicate different NP sizes. As concentration increases, grows, marking the onset of dynamical arrest. (b) The shape parameter γ (right axis) increase from 1 up to as grows from roughly 40% –48−50%. In the same plot we also report the “non-Gaussian” parameter α₂ which increases from 0 (Brownian case) to higher values. (c) In the same range, the dependence switch from (diffusion) to (ballistic-like). Overall, the trends of γ, and indicate the presence, in the arrested state, of sudden, intermittent rearrangements. Colors indicate different NP sizes.

Inline graphic — Diffusive dynamics is observed by XPCS at low concentration and up to . As grows we find an intermediate regime of caged diffusion, with relaxation times growing with. For (vertical line) an arrested regime is reached, in which the only surviving motions are intermittent rearrangements.(a) On the left axis, we report extracted from XPCS at ; different symbols/colors indicate different NP sizes. As concentration increases, grows, marking the onset of dynamical arrest. (b) The shape parameter γ (right axis) increase from 1 up to as grows from roughly 40% –48−50%. In the same plot we also report the “non-Gaussian” parameter α₂ which increases from 0 (Brownian case) to higher values. (c) In the same range, the dependence switch from (diffusion) to (ballistic-like). Overall, the trends of γ, and indicate the presence, in the arrested state, of sudden, intermittent rearrangements. Colors indicate different NP sizes.