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Mechanistic Insight into Nanoparticle Surface Adsorption by Solution NMR Spectroscopy in an Aqueous Gel [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 9,802-9,806 : digital, PDF file
Additional Creators
Ames Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Engineering nanoparticle (NP) functions at the molecular level requires a detailed understanding of the dynamic processes occurring at the NP surface. Herein we show that a combination of dark-state exchange saturation transfer (DEST) and relaxation dispersion (RD) NMR experiments on gel-stabilized NP samples enables the accurate determination of the kinetics and thermodynamics of adsorption. We used the former approach to describe the interaction of cholic acid (CA) and phenol (PhOH) with ceria NPs with a diameter of approximately 200 nm. Whereas CA formed weak interactions with the NPs, PhOH was tightly bound to the NP surface. Interestingly, we found that the adsorption of PhOH proceeds via an intermediate, weakly bound state in which the small molecule has residual degrees of rotational diffusion. Here we believe the use of aqueous gels for stabilizing NP samples will increase the applicability of solution NMR methods to the characterization of nanomaterials.
Report Numbers
E 1.99:is-j--9437
is-j--9437
Subject(s)
Note
Published through SciTech Connect.
06/22/2017.
"is-j--9437"
Angewandte Chemie (International Edition) 56 33 ISSN 1433-7851 AM
Egner, Timothy K. [Iowa State Univ., Ames, IA (United States)]; Naik, Pranjali [Ames Lab. and Iowa State Univ., Ames, IA (United States)]; Nelson, Nicholas C. [Ames Lab. and Iowa State Univ., Ames, IA (United States)]; Slowing, Igor I. [Ames Lab. and Iowa State Univ., Ames, IA (United States)]; Venditti, Vincenzo [Iowa State Univ., Ames, IA (United States)].
Funding Information
AC02-07CH11358
View MARC record | catkey: 24043135