Ion-specific long-range correlations on interfacial water driven by hydrogen bond fluctuations.
作者： Shinichi Enami , Agustín J. Colussi
DOI: 10.1021/JP411385U
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摘要: Some of the most important processes in nature involve interfacial water. It has long been conjectured that specific ion effects therein are associated with unique properties Here we reveal mechanism such association by showing strength ion-specific long-range correlations tracks amplification fluctuations on surface water-alcohol mixtures at percolation thresholds their hydrogen-bonded water networks. We used situ online electrospray mass spectrometry to determine χ = [I–]/[Br–] ratios microfilms (NaI + NaBr) solutions water–methanol (ME) and water–isopropanol (IP) as functions x_(ME) x_(IP) molar fractions, addition NaClO_4. found that, beginning 0.1 μM, ClO_4^– detectable peak ~ 0.40, x_(IP)~ 0.15, i.e., where maximize mean cluster sizes and, hence, interionic connections. The stronger between ions similar propensities suggest propagate preferentially along 2-D layers.
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