Anomalous Ion Transport in 2D Graphene Oxide Nanochannels Enabled by Hydration Mimicry with Confined Amino Acids.
basic_science · Level V
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- Record sourced from PubMed, PMID 41066274.
- Also identified by DOI 10.1021/acs.nanolett.5c04013.
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Abstract
Inspired by biological ion channels, we design graphene oxide (GO) membranes functionalized with aspartic acid to introduce ion-specific binding sites within angstrom-scale confinement. This leads to a notable suppression of monovalent ion mobility, contributing to unexpected selectivity for divalent calcium ions, with Ca<sup>2+</sup>/Li<sup>+</sup> and Ca<sup>2+</sup>/Na<sup>+</sup> selectivities of ∼9.8 and ∼4.8, respectively. With the combination of transition-state theory and molecular dynamics simulations, the complex interplay of hydration energy, spatial confinement, and ion-ligand coordination strength is highlighted, offering a mechanistic basis for designing membranes with nonclassical selectivity profiles.