Stabilization of superparamagnetic nickel nanoparticles in a sepiolite matrix

Silica–alumina/sepiolite nanoarchitectures

“…The functionalities of these nanoarchitectures cover optical, magnetic and sensing applications depending on the NPs properties. 1,[9][10][11] This synthesis approach has been also applied to assembling oxide phases on sepiolite bers, for instance Fe 2 O 3 (hematite), resulting in nanoarchitectures that can be used as magnetic sensors for relative humidity measurements. 10 More recently, it has been reported the easiest incorporation of Fe 3 O 4 (magnetite) NPs over sepiolite by means of the inltration of the silicate by a non-aqueous magnetite ferrouid, leading to a homogeneous distribution of the magnetite NPs on the mineral surface.…”

Magneto-optical Faraday activity in transparent FeCo-sepiolite/polystyrene nanocomposites

“…In this work, we describe the preparation of a flexible, transparent and magnetic multiscale composite and its magnetic and magneto-optical activity, particularly the Faraday effect, in the range of 1.0-4.5 eV. The methodology relies on the possibility of embedding metallic magnetic nanoparticles inside sepiolite (Esteban-Cubillo et al, 2010;EstebanCubillo et al, 2008;Pecharroman et al, 2006) thus preserving them from agglomeration and corrosion. It is also feasible to disperse sepiolite bearing metallic nanoparticles into an ad-hoc polymeric matrix and to produce materials behaving in all as plastics (light, tough, easy to process, transparent) while displaying specific properties endowed by the metallic nanoparticle.…”