Solution Structure and Hydration Forces between Mica and Hydrophilic Versus Hydrophobic SurfacesClick to copy article linkArticle link copied!
- E. Nakouzi*E. Nakouzi*Email: [email protected]Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by E. Nakouzi
- S. KerisitS. KerisitPhysical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by S. Kerisit
- B. A. LeggB. A. LeggPhysical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by B. A. Legg
- S. YadavS. YadavPhysical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by S. Yadav
- D. LiD. LiPhysical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by D. Li
- A. G. StackA. G. StackChemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United StatesMore by A. G. Stack
- C. J. MundyC. J. MundyPhysical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesDepartment of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United StatesMore by C. J. Mundy
- J. ChunJ. ChunPhysical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesDepartment of Chemical Engineering, CUNY City College of New York, New York, New York 10031, United StatesMore by J. Chun
- G. K. SchenterG. K. SchenterPhysical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesDepartment of Chemistry, Washington State University, Pullman, Washington 99164, United StatesMore by G. K. Schenter
- J. J. De Yoreo*J. J. De Yoreo*Email: [email protected]Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesDepartment of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United StatesMore by J. J. De Yoreo
Abstract
Solid–liquid interfaces are central to a range of interesting phenomena including colloidal aggregation, crystallization by particle attachment, catalysis, heterogeneous nucleation, water desalination, and biomolecular assembly. While three-dimensional atomic force microscopy (3D AFM) has emerged as a technique for resolving interfacial solution structure at the molecular scale, key challenges for data interpretation persist, most notably regarding the influence of the probe on the measured structure. Using the mica–water system as a case study, we investigate the effect of hydrophilic and hydrophobic probes on interfacial solution structure measured by 3D AFM. Data from hydrophilic silicon-based probes are in good agreement with molecular dynamics simulations, wherein the innermost water molecules adsorb preferentially at the surface ditrigonal cavity sites, followed by two additional ordered hydration layers. In contrast, the hydrophobic carbon-based probes detect vertical oscillatory features but do not show lateral patterning that matches the underlying mica lattice. At high ionic strength, up to six of these oscillatory features are observed extending 2 nm into the solution phase with an average spacing of 0.29 ± (0.04) nm. We also determine that the repulsive hydration force between mica and the hydrophilic probe depends on the nature and concentration of ions in solution. Specifically, solutions with stronger ion–water and ion–ion interactions produce a stronger repulsive hydration force as the probe approaches the surface. Based on these observations, we present a scheme for controlling the outcomes of particle aggregation and attachment by varying the solution conditions to tune the hydration force.
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This article is cited by 5 publications.
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