Spin Diffusion Transfer Difference (SDTD) NMR: An Advanced Method for the Characterisation of Water Structuration Within Particle Networks

Gabrielli, Valeria, Kuraite, Agne, Silva, Marcelo Alves da, Edler, Karen J., Angulo, Jesús, Nepravishta, Ridvan, Muñoz-García, Juan C. and Khimyak, Yaroslav (2021) Spin Diffusion Transfer Difference (SDTD) NMR: An Advanced Method for the Characterisation of Water Structuration Within Particle Networks. Journal of Colloid and Interface Science, 594. pp. 217-227. ISSN 0021-9797

[img] PDF (Accepted_Manuscript) - Accepted Version
Restricted to Repository staff only until 9 March 2022.

Download (1MB) | Request a copy

Abstract

Hypothesis The classical STD NMR protocol to monitor water interactions in gels is strongly dependent on gelator and solvent concentrations and does not report on the degree of structuration of the solvent at the particle/solvent interface. We hypothesised that, for suspensions of large gelator particles, solvent structuration could be characterised by STD NMR when taking into account the particle-to-solvent 1H-1H spin diffusion transfer using the 1D diffusion equation. Experiments We have carried out a systematic study on effect of gelator and solvent concentrations, and gelator surface charge, affecting the behaviour of the classical STD NMR build-up curves. To do so, we have characterised solvent interactions in dispersions of starch and cellulose-like particles prepared in deuterated water and alcohol/D2O mixtures. Findings The Spin Diffusion Transfer Difference (SDTD) NMR protocol is independent of the gelator and solvent concentrations, hence allowing the estimation of the degree of solvent structuration within different particle networks. In addition, the simulation of SDTD build-up curves using the general one–dimensional diffusion equation allows the determination of minimum distances (r) and spin diffusion rates (D) at the particle/solvent interface. This novel NMR protocol can be readily extended to characterise the solvent(s) organisation in any type of colloidal systems constituted by large particles.

Item Type: Article
Faculty \ School: Faculty of Science > School of Pharmacy
Faculty of Science > School of Chemistry
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 17 Aug 2020 23:56
Last Modified: 04 Apr 2021 02:25
URI: https://ueaeprints.uea.ac.uk/id/eprint/76472
DOI: 10.26434/chemrxiv.12770813.v1

Actions (login required)

View Item View Item