Nematic ordering of suspension of charged anisotropic colloids detected by multinuclear quadrupolar spectra and 1H PGSE-NMR measurements

摘要: The structure of aqueous dispersion charged anisotropic nano-composites (synthetic Laponite clays) have been studied by NMR and numerical simulations based on a multi-scale statistical analysis used to interpret the mobility confined water molecule diffusing within dense dispersions (29–52% w/w) prepared uniaxial compression. Firstly, lineshape detected quadrupolar spectroscopy counterions (23Na or 7Li) exhibits large residual splitting Δ ν which is fingerprint macroscopic nematic ordering particles. Secondly, these results are also confirmed anisotropy self-diffusion tensor measured 1H Pulsed Gradient Spin Echo NMR. This increases with suspension density. Thirdly, bridges gap between time-scale (ps) accessible Molecular Dynamics (μs) Brownian Dynamics, leading behaviour comparable PGSE-NMR data measurements.