Solvent Relaxation NMR as a Tool to Study Particle Dispersions in Non-Aqueous Systems

The determination of the NMR spin–spin relaxation rate of water in (purely) aqueous particulate dispersions has been shown to be a convenient and facile experimental approach to probing the composition of near particle surface structures. Here, a systematic study has been undertaken of both non-aqueous and mixed aqueous–non-aqueous solvent particulate dispersions to explore the universality of the solvent relaxation technique. As in the aqueous case, a linear relationship between the surface area present and the solvent relaxation rate is observed, confirming the rapid exchange of the solvent molecules between the surface and the bulk and thereby illustrating the viability of the experimental methodology to study such systems. Crucially, the surface enhancement effect was considerably weaker in non-aqueous systems compared with aqueous dispersions and reflects a potential limitation of the wider deployment of this experimental methodology.

[1]  Stuart W. Prescott,et al.  Fast NMR relaxation, powder wettability and Hansen Solubility Parameter analyses applied to particle dispersibility , 2021, Powder Technology.

[2]  A. Paul,et al.  Probing the surfaces of core‐shell and hollow nanoparticles by solvent relaxation NMR , 2018, Magnetic resonance in chemistry : MRC.

[3]  Stuart W. Prescott,et al.  The use of solvent relaxation NMR to study colloidal suspensions , 2013 .

[4]  Stuart W. Prescott,et al.  Colloidal particles in competition for stabilizer: a solvent relaxation NMR study of polymer adsorption and desorption. , 2012, Langmuir : the ACS journal of surfaces and colloids.

[5]  D. Shantz,et al.  PFG NMR studies of lysine-silica solutions. , 2012, Journal of colloid and interface science.

[6]  H. Hoffmann,et al.  PFG-NMR self-diffusion measurements in the single phase channels of a microemulsion system with an anionic–nonionic surfactant mixture , 2012 .

[7]  Steven P. Brown,et al.  Applications of high-resolution 1H solid-state NMR. , 2012, Solid state nuclear magnetic resonance.

[8]  J. van der Gucht,et al.  Looped structure of flowerlike micelles revealed by 1H NMR relaxometry and light scattering. , 2011, Langmuir : the ACS journal of surfaces and colloids.

[9]  J. Hanna,et al.  Recent technique developments and applications of solid state NMR in characterising inorganic materials. , 2010, Solid state nuclear magnetic resonance.

[10]  T. Cosgrove,et al.  Fourier-transform Carr-Purcell-Meiboom-Gill NMR experiments on polymers in colloidal dispersions: how many polymer molecules per particle? , 2008, Langmuir : the ACS journal of surfaces and colloids.

[11]  K. Yoshida,et al.  17O NMR relaxation study of dynamics of water molecules in aqueous mixtures of methanol, ethanol, and 1-propanol over a temperature range of 283–403 K , 2006 .

[12]  T. Cosgrove,et al.  NMR Solvent Relaxation in Studies of Multicomponent Polymer Adsorption , 2002 .

[13]  T. Cosgrove,et al.  Solvent Relaxation NMR Measurements on Polymer, Particle, Surfactant Systems , 1998 .

[14]  T. Cosgrove,et al.  Polymer Adsorption. The Effect of the Relative Sizes of Polymer and Particle , 1995 .

[15]  T. Cosgrove,et al.  Polymer adsorption and desorption studies via 1H NMR relaxation of solvent. , 1991 .

[16]  G. D. Parfitt.  The role of the surface in the dispersion of powders in liquids , 1981 .

[17]  D. Woessner,et al.  NUCLEAR TRANSFER AND ANISOTROPIC MOTIONAL SPIN PHENOMENA: RELAXATION TIME TEMPERATURE DEPENDENCE STUDIES OF WATER ADSORBED ON SILICA GEL. IV , 1963 .

[18]  S. Meiboom,et al.  Modified Spin‐Echo Method for Measuring Nuclear Relaxation Times , 1958 .