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- Title
Mechanistic Insight into Nanoparticle Surface Adsorption by Solution NMR Spectroscopy in an Aqueous Gel.
- Authors
Egner, Timothy K.; Naik, Pranjali; Nelson, Nicholas C.; Slowing, Igor I.; Venditti, Vincenzo
- Abstract
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. We believe the use of aqueous gels for stabilizing NP samples will increase the applicability of solution NMR methods to the characterization of nanomaterials.
- Subjects
NANOPARTICLES; ADSORPTION (Chemistry); NUCLEAR magnetic resonance spectroscopy; SATURATION (Chemistry); THERMODYNAMICS; CHEMICAL relaxation; AQUEOUS solutions
- Publication
Angewandte Chemie, 2017, Vol 129, Issue 33, p9934
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201704471