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DOI	10.1073/pnas.1702760114
	Mechanism of ion adsorption to aqueous interfaces: Graphene/water vs. air/water
	McCaffrey D.L.; Nguyen S.C.; Cox S.J.; Weller H.; Alivisatos A.P.; Geissler P.L.; Saykally R.J.
发表日期	2017
ISSN	0027-8424
起始页码	13369
结束页码	13373
卷号	114 期号:51
英文摘要	The adsorption of ions to aqueous interfaces is a phenomenon that profoundly influences vital processes in many areas of science, including biology, atmospheric chemistry, electrical energy storage, and water process engineering. Although classical electrostatics theory predicts that ions are repelled from water/hydrophobe (e.g., air/water) interfaces, both computer simulations and experiments have shown that chaotropic ions actually exhibit enhanced concentrations at the air/water interface. Although mechanistic pictures have been developed to explain this counterintuitive observation, their general applicability, particularly in the presence of material substrates, remains unclear. Here we investigate ion adsorption to the model interface formed by water and graphene. Deep UV second harmonic generation measurements of the SCN- ion, a prototypical chaotrope, determined a free energy of adsorption within error of that for air/water. Unlike for the air/water interface, wherein repartitioning of the solvent energy drives ion adsorption, our computer simulations reveal that direct ion/graphene interactions dominate the favorable enthalpy change. Moreover, the graphene sheets dampen capillary waves such that rotational anisotropy of the solute, if present, is the dominant entropy contribution, in contrast to the air/water interface.
英文关键词	Adsorption; Graphene; Molecular dynamics; SHG spectroscopy; Specific ion effects
语种	英语
scopus关键词	graphene; ion; water; adsorption; air; Article; computer simulation; molecular dynamics; priority journal; spectroscopy; ultraviolet radiation
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160561
作者单位	McCaffrey, D.L., Department of Chemistry, University of California, Berkeley, CA 94720, United States, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Nguyen, S.C., Department of Chemistry, University of California, Berkeley, CA 94720, United States, Hamburg Centre for Ultrafast Imaging, University of Hamburg, Hamburg, 22761, Germany; Cox, S.J., Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Weller, H., Hamburg Centre for Ultrafast Imaging, University of Hamburg, Hamburg, 22761, Germany, Institute of Physical Chemistry, University of Hamburg, Hamburg, 20146, Germany; Alivisatos, A.P., Department of Chemistry, University of California, Berkeley, CA 94720, United States, Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, United States, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States, Kavli Energy ...
推荐引用方式 GB/T 7714	McCaffrey D.L.,Nguyen S.C.,Cox S.J.,et al. Mechanism of ion adsorption to aqueous interfaces: Graphene/water vs. air/water[J],2017,114(51).
APA	McCaffrey D.L..,Nguyen S.C..,Cox S.J..,Weller H..,Alivisatos A.P..,...&Saykally R.J..(2017).Mechanism of ion adsorption to aqueous interfaces: Graphene/water vs. air/water.Proceedings of the National Academy of Sciences of the United States of America,114(51).
MLA	McCaffrey D.L.,et al."Mechanism of ion adsorption to aqueous interfaces: Graphene/water vs. air/water".Proceedings of the National Academy of Sciences of the United States of America 114.51(2017).