title: Cellulose-silica aerogels.
abstract: Aerogels based on interpenetrated cellulose-silica networks were prepared and characterised. Wet coagulated cellulose was impregnated with silica phase, polyethoxydisiloxane, using two methods: (i) molecular diffusion and (ii) forced flow induced by pressure difference. The latter allowed an enormous decrease in the impregnation times, by almost three orders of magnitude, for a sample with the same geometry. In both cases, nanostructured silica gel was in situ formed inside cellulose matrix. Nitrogen adsorption analysis revealed an almost threefold increase in pores specific surface area, from cellulose aerogel alone to organic-inorganic composite. Morphology, thermal conductivity and mechanical properties under uniaxial compression were investigated. Thermal conductivity of composite aerogels was lower than that of cellulose aerogel due to the formation of superinsulating mesoporous silica inside cellulose pores. Furthermore, composite aerogels were stiffer than each of reference aerogels.
authors.affiliation: MINES ParisTech, PSL Research University, CEMEF-Centre de Mise en Forme des Matériaux, rue Claude Daunesse, CS 10207, 06904 Sophia Antipolis Cedex, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Demilecamps
authors.affiliation: MINES ParisTech, PSL Research University, PERSEE-Centre procédés, énergies renouvelables et systèmes énergétiques, rue Claude Daunesse, CS 10207, 06904 Sophia Antipolis Cedex, France.
authors.forename: Christian
authors.initials: C
authors.lastname: Beauger
authors.affiliation: MINES ParisTech, PSL Research University, PERSEE-Centre procédés, énergies renouvelables et systèmes énergétiques, rue Claude Daunesse, CS 10207, 06904 Sophia Antipolis Cedex, France.
authors.forename: Claudia
authors.initials: C
authors.lastname: Hildenbrand
authors.affiliation: MINES ParisTech, PSL Research University, PERSEE-Centre procédés, énergies renouvelables et systèmes énergétiques, rue Claude Daunesse, CS 10207, 06904 Sophia Antipolis Cedex, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Rigacci
authors.affiliation: MINES ParisTech, PSL Research University, CEMEF-Centre de Mise en Forme des Matériaux, rue Claude Daunesse, CS 10207, 06904 Sophia Antipolis Cedex, France. Electronic address: tatiana.budtova@mines-paristech.fr.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Budtova
mesh_terms: D000327:Adsorption; D002482:Cellulose / Q000737:chemistry*; D005782:Gels; D057927:Hydrophobic and Hydrophilic Interactions; D009584:Nitrogen / Q000378:metabolism; D012822:Silicon Dioxide / Q000737:chemistry*; D013814:Thermal Conductivity
chemical_list: D005782:Gels; D012822:Silicon Dioxide; D002482:Cellulose; D009584:Nitrogen
keywords: Aerogels; Cellulose; Nanostructured composites; Silica; Specific surface area; Thermal conductivity