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- W4319653721 abstract "Observing finite regions of a bigger system is a common experience, from microscopy to molecular simulations. In the latter especially, there is ongoing interest in predicting thermodynamic properties from tracking fluctuations in finite observation volumes. However, kinetic properties have received less attention, especially not in ionic solutions, where electrostatic interactions play a decisive role. Here, we probe ionic fluctuations in finite volumes with Brownian dynamics and build an analytical framework that reproduces our simulation results and is broadly applicable to other systems with pairwise interactions. Particle number and charge correlations exhibit a rich phenomenology with time, characterized by a diversity of timescales. The noise spectrum of both quantities decays as $1/f^{3/2}$, where $f$ is the frequency. This signature of fractional noise shows the universality of $1/f^{3/2}$ scalings when observing diffusing particles in finite domains. The hyperuniform behaviour of charge fluctuations, namely that correlations scale with the area of the observation volume, is preserved in time. Correlations even become proportional to the box perimeter at sufficiently long times. Our results pave the way to understand fluctuations in more complex systems, from nanopores to single-particle electrochemistry." @default.
- W4319653721 created "2023-02-10" @default.
- W4319653721 creator A5047314592 @default.
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- W4319653721 date "2023-02-07" @default.
- W4319653721 modified "2023-09-26" @default.
- W4319653721 title "Ionic fluctuations in finite volumes: fractional noise and hyperuniformity" @default.
- W4319653721 doi "https://doi.org/10.48550/arxiv.2302.03393" @default.
- W4319653721 hasPublicationYear "2023" @default.
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