Specific ion effects on the hydrophobic interaction of benzene self-assembled monolayers

Literature Information

Publication Date 2015-07-22
DOI 10.1039/C5CP01803J
Impact Factor 3.676
Authors

S. Dobberschütz, M. Rimmen, T. Hassenkam, M. P. Andersson, S. L. S. Stipp


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Abstract

The interaction of aromatic compounds with various ions in aqueous solutions plays a role in a number of fields, as diverse as protein folding and enhanced oil recovery, among others. Therefore, we have investigated the effect of the four electrolytes, KCl, NaCl, MgCl2 and CaCl2, on the hydrophobic interaction of benzene self-assembled monolayers. Using the jump to contact phenomenon of an atomic force microscope (AFM) tip as an indicator of attractive forces between the surfaces of a sample and the tip, we discovered lower frequencies in the snap in as well as narrower distributions for the snap in distance for the monovalent ions, especially for K+, compared with the behaviour for the divalent ions. These observations are explained by the accumulation of charge at the surface by cation–π interactions and an influence of the ions on the formation of capillaries that bridge the tip to the surface. Bridging capillaries, i.e. nanometre scale gas bubbles, are some of the factors contributing to the long range hydrophobic interaction. The results demonstrate how ions influence the attraction of hydrophobic entities in aqueous solutions.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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