Surface analysis of silica gel particles after mechanical dry coating with magnesium stearateReport as inadecuate

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* Corresponding author 1 RAPSODEE - Centre de recherche d-Albi en génie des procédés des solides divisés, de l-énergie et de l-environnement 2 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels 3 LPMG-EMSE - Laboratoire des Procédés en Milieux Granulaires 4 P2MC-ENSMSE - Département Poudres et Matériaux Multi-Composants

Abstract : A dry coating technique has been used to change the surface properties of silica gel particles d50=55μm by coating with different mass ratios of magnesium stearate - MgSt2 d50=4.6μm: 1%, 5%, 15% and 30%. The dry coating experiments were performed using a -Hybridizer, a high-speed dry impact blending coater-, manufactured by Nara Machinery Japan. The surface morphology of the uncoated and coated silica gel particles was observed by environmental scanning electron microscopy ESEM. The images show that a greater MgSt2 coverage was observed on the surface of silica gel as the MgSt2 mass ratio is increased. In addition, atomic force microscopy AFM analysis revealed how this coating process makes possible a discrete and uniform dispersion of the MgSt2 particles. AFM studies were carried out with a scanning probe microscope Multimode Nanoscope IIIA Digital Instruments -Veeco Metrology Group.

Keywords : AFM phase imaging adhesion force dry coating silica magnesium stearate

Author: Laurence Galet - Yamina Ouabbas - Alain Chamayou - Philippe Grosseau - Michel Baron - Gérard Thomas -



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