Advanced Materials and New Applications of Sepiolite and Palygorskite

Clay‐Graphene Nanoplatelets Functional Conducting Composites

“…At higher relative pressure a multilayer adsorption followed by capillary condensation is observed, owing to the presence of mesoporosity in the structure, which is ascribed to a type II. [ 19,21 ] GNP-150 from KNANO shows very low microporosity being a solid whose porosity can be essentially associated with its external surface. [ 35 ] The graphene-nanoplatelets show an isotherm associated to the type II with a type H3 hysteresis loop, called type IIb by Rouquerol et al [ 35 ] Type IIb isotherms are usually obtained for solids with aggregates of plate-like particles and non-rigid slit-shaped pores.…”

“…[ 18,19 ] The assembly of this silicate with polymers of natural origin (biopolymers) leads to bionanocomposites provided of interesting both mechanical and functional properties. Sepiolite has been largely studied as an additive for nanofi ller reinforcement of polymer matrices of diverse nature.…”

“…[ 14 ] We have also recently reported the on-surface graphene production using clays and other porous solids and natural resources such as carbohydrates (i.e., sucrose) or proteins (i.e., gelatin) as carbon precursors. [ 19 ] The crystalline structure of sepiolite is related to talc-like ribbons placed parallel to the fi ber axis ( c -axis) ( Figure 2 ), which are built-up by blocks alternating with structural cavities (tunnels) that give rise to a fi brous silicate provided with micro-and meso-porosity, elevated specifi c surface area and therefore, high adsorption capacity. [ 15,16 ] The procedure consists in the impregnation of the porous solids with the precursors followed by a thermal treatment in the absence of oxygen at temperatures below 1000 °C and, interestingly, graphene-like fl akes are formed without requiring addition of reducing agents.…”

Variability of the surface properties of sepiolite

“…Exhaustive reviews of the industrial uses of sepiolite are given in Murray (1999Murray ( ), M varez et al (2011 and Ruiz Hitzky et al (2011). Industrial uses of sepiolite are related to its sorptive, colloidal rheological and catalytic properties.…”

Thermal Stability and Decomposition Study of Epoxy/Clay Nanocomposites

“…Bentonite has been commercially used as a flame retardant in plastic material by further purification of the filler content (Cárdenas et al 2009). Due to the use of bentonite in plastic polymer area, many researchers studied these bentonite properties and tried to maximize the enhancing effect in plastic polymer Hussin et al 2011;Ruiz-Hitzky et al 2011;Sayılkan et al 2004). Since there is no research regarding nanometer-sized bentonite from Sabah has been reported, hence, the authors has decided to explore its potential as plastic filler in terms of thermal exposure and its morphologies in epoxy.…”