Mechanistic Insight into Nanoparticle Surface Adsorption by Solution NMR Spectroscopy in an Aqueous Gel
| Autor: | Timothy K. Egner, Vincenzo Venditti, Nicholas C. Nelson, Igor I. Slowing, Pranjali Naik |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Chemistry Inorganic chemistry Kinetics Rotational diffusion Nanoparticle 02 engineering and technology General Medicine Nuclear magnetic resonance spectroscopy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Dark state Adsorption Desorption Physical chemistry 0210 nano-technology |
| Zdroj: | Angewandte Chemie. 129:9934-9938 |
| ISSN: | 1521-3757 0044-8249 |
| Popis: | Engineering nanoparticle (NP) functions at molecular level requires a detailed understanding of the dynamic processes occurring at the NP surface. Here we show that the combined analysis of Dark state Exchange Saturation Transfer (DEST) and Relaxation Dispersion (RD) NMR experiments acquired on gel-stabilized samples of NP allows for 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 ~200 nm ceria NP. We show that, while CA forms weak interactions with the NP, PhOH is tightly bound to the NP surface. Interestingly, we found that adsorption of PhOH proceeds through 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 characterization of nanomaterials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |