CINDECA   05422
CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
artículos
Título:
STRUCTURAL SYNTHESIS OF HYDROPHILIC AND HYDROPHOBIC SILICA FOR ITS USE IN FILMS FOOD
Autor/es:
ROMINA A. ARRECHE; MIRTA N. BLANCO; JOSÉ M. MARTÍN MARTÍNEZ; PATRICIA G. VÁZQUEZ
Revista:
Procedia materials
Editorial:
Elsevier
Referencias:
Año: 2011
ISSN:
2210-7843
Resumen:
This study focuses on additives or
loads, chemically inert solid materials incorporated in the formulation of
films, plastic and/or adhesives to modify their mechanical properties and
reduce the cost of manufacturing. Essentially, this work purposes develop
hybrid materials based on silica, with different surface properties modified by
techniques like the modification, which used 3-aminopropyl
triethoxysilane (APS)and 1,1,1,3,3,3hexamethyldisilazane (HMDS) reagents with a view to their future
employment as films by different fruits. The characterization techniques used
were Ray X (DRX) diffraction, transmission electronic microscopy (TEM) and
scanning (SEM), textural properties, surface and potentiometric titration with
n-butylamine. Hydrophobic silicas were obtained in synthesis when added APS and
HMDS as modifiers. The textural characteristics of the silicas showed marked
effect by adding them. The titration of the modified silicas acidic sites
showed abrupt decrease of acidity on silica unchanged. The TEM micrographic of
synthesized samples showed that the increase of HMDS led to maintain the
spherical shape of silica base, increasing the formation of agglomerations and
the primary particle size.