从受限离子动力学中分离1/f噪声

IF 3.3 3区 化学 Q2 CHEMISTRY, PHYSICAL
Paul Robin, Mathieu Lizée, Qian Yang, Théo Emmerich, Alessandro Siria and Lydéric Bocquet
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引用次数: 1

摘要

已知离子通过生物和固态纳米通道的传输是一个高噪声的过程。根据经验可知,电流波动的功率谱的比例与频率的倒数相似,遵循了长期存在但鲜为人知的胡格定律。在这里,我们报道了具有不同表面性质的纳米级二维通道的电流波动测量结果。发现波动的结构取决于通道的材料。虽然在原始通道中,电流波动的范围像1/f1+a,a=0–0.5,但活性石墨通道的噪声功率谱根据频率显示出不同的状态。基于这些观察,我们发展了一种直接将离子动力学和电流波动联系起来的理论形式。我们预测,噪声功率谱的形式为1/f×Schannel(f),其中1/f波动出现在通道两侧的流体储层中,Schannel描述了其中的波动。因此,与Hooge定律的偏差允许直接访问通道的离子传输动力学,解释了在2D纳米通道实验中观察到的整个现象学。我们的研究结果证明了如何利用电流波动来表征纳米级离子动力学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Disentangling 1/f noise from confined ion dynamics

Ion transport through biological and solid-state nanochannels is known to be a highly noisy process. The power spectrum of current fluctuations is empirically known to scale like the inverse of frequency, following the long-standing yet poorly understood Hooge's law. Here, we report measurements of current fluctuations across nanometer-scale two-dimensional channels with different surface properties. The structure of fluctuations is found to depend on the channel's material. While in pristine channels current fluctuations scale like 1/f1+a with a = 0–0.5, the noise power spectrum of activated graphite channels displays different regimes depending on frequency. Based on these observations, we develop a theoretical formalism directly linking ion dynamics and current fluctuations. We predict that the noise power spectrum takes the form 1/f × Schannel(f), where 1/f fluctuations emerge in fluidic reservoirs on both sides of the channel and Schannel describes fluctuations inside it. Deviations to Hooge's law thus allow direct access to the ion transport dynamics of the channel – explaining the entire phenomenology observed in experiments on 2D nanochannels. Our results demonstrate how current fluctuations can be used to characterize nanoscale ion dynamics.

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来源期刊
Faraday Discussions
Faraday Discussions 化学-物理化学
自引率
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发文量
259
期刊介绍: Discussion summary and research papers from discussion meetings that focus on rapidly developing areas of physical chemistry and its interfaces
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