23Na nuclear magnetic resonance and 1H pulsed gradient spin-echo detection of the critical concentration corresponding to the isotrope/nematic transition within aqueous dispersions of charged anisotropic nanoparticles

Article Abstract:

The critical clay concentration corresponding to the occurrence of nematic ordering is determined by using 23Na and 1H nuclear magnetic resonance, in addition to the order parameter of nematic dispersions. The dense macroscopic clay samples are prepared by oedometric compression, leading to a critical clay concentration for the isotrope/nematic transition significantly higher than that determined previously by using birefringence detection within capillary tubes.

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Water self-diffusion within nematic dispersions of nanocomposites : a multiscale analysis of (super 1) H pulsed gradient spin-echo NMR measurements

Article Abstract:

The nematic ordering of dense aqueous suspensions ( 29-52% w/w ) prepared by uniaxial compression was detected by analyzing the splitting of the nuclear magnetic resonance line of the quadrupolar counterions ( (super 7 ) Li and (super 23 ) Na ) neutralizing the negative charges of clay. The tensor describing the water self-diffusion was measured by neutralizing (super 1) H pulsed gradient spin-echo ( PGSE ) NMR spectroscopy.

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A (N, V, T) Monte Carlo study of the long-range electrostatic coupling between large collections of charged colloidal platelets

Article Abstract:

Monte Carlo simulations of a large collection of charged platelets are performed to analyze their spatial organization and mechanical stability. In the framework of a hierarchical approach, the long-range electrostatic coupling is treated by a multipole expansion.

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