Selective transport of water molecules through interlayer spaces in graphite

Show simple item record Saini, Lalita Nemala, Siva Sankar Rathi, Aparna Kaushik, Suvigya Kalon, Gopinadhan 2021-12-24T11:50:55Z 2021-12-24T11:50:55Z 2021-12
dc.identifier.citation Saini, Lalita; Nemala, Siva Sankar; Rathi, Aparna; Kaushik, Suvigya and Kalon, Gopinadhan, "Selective transport of water molecules through interlayer spaces in graphite", arXiv, Cornell University Library, DOI: arXiv:2112.02826, Dec. 2021 en_US
dc.description.abstract Interlayer space in graphite is impermeable to ions and molecules, including protons. Its controlled expansion would find several applications in desalination, gas purification, high-density batteries, etc. In the past, metal intercalation has been used to modify graphitic interlayer spaces; however, resultant intercalation compounds are unstable in water. Here, we successfully expanded graphite interlayer spaces by intercalating aqueous KCl ions electrochemically. The water conductivity shows several orders of enhancement when compared to unintercalated graphite. Water evaporation experiments further confirm the high permeation rate. There is weak ion permeation through interlayer spaces, up to the highest chloride concentration of 1 M, an indication of sterically limited transport. In these very few transported ions, we observe hydration energy-dependent selectivity between salt ions. These strongly suggest a soft ball model of steric exclusion, which is rarely reported. Our spectroscopy studies provide clear evidence for cation-{\pi} interactions, though weak anion-{\pi} interactions were also detectable. These findings improve our understanding of molecular and ionic transport at the atomic scale.
dc.description.statementofresponsibility by Lalita Saini, Siva Sankar Nemala, Aparna Rathi, Suvigya Kaushik and Gopinadhan Kalon
dc.language.iso en_US en_US
dc.publisher Cornell University Library en_US
dc.subject Mesoscale and Nanoscale Physics en_US
dc.subject Materials Science en_US
dc.subject Graphite en_US
dc.subject Graphite interlayer spaces en_US
dc.title Selective transport of water molecules through interlayer spaces in graphite en_US
dc.type Pre-Print en_US
dc.relation.journal arXiv

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