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Structure-Thermal Conductivity Tentative Correlation for Hybrid Aerogels Based on Nanofibrillated Cellulose-Mesoporous Silica Nanocomposite

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Journal of Renewable Materials 2018年第3期6卷 299-313页

作者： dounia bendahou Abdelkader bendahou Bastien Seantier Benedicte Lebeau Yves Grohens Hamid Kaddami University of Southern Brittany Dupuy de Lôme Research InstituteFRE-CNRS 3744BP 9211656321 Lorient CedexFrance Cadi Ayyad University Faculty of Sciences and TechnologiesAvenue Abdelkrim ElkhattabiB.P.549MarrakechMorocco University of Upper Alsace Institute of Materials Science of Mulhouse(IS2M)68057 Mulhouse CedexFrance

Hybrid aerogels have been prepared by freeze-drying technique after mixing water dispersions of cellulose microfibers or cellulose nanofibers and silica(SiO2)of type SBA-15(2D-hexagonal).The prepared composites were characterized by different analysis techniques such as SEM,hot-filament,DMA,*** composites are compared to those previously prepared using nanozeolites(NZs)as mineral *** morphology studied by SEM indicated that both systems have different structures,i.e.,individual fibers for cellulose microfibers WP-based aerogels and films for nanofibrillated cellulose NFC-based ones....These differences seem to be driven by the charge of the particles,their aspect ratio and *** hybrid materials exhibit tunable thermal conductivity and mechanical *** thermal conductivity values range between^18 to 28 mW.m^-1.K^-1 and confirm the superinsulation ability of these fibrous *** on the thermal insulation properties and mechanical properties was shown by adjunction of mineral particles to both cellulose-based aerogels by reaching pore size lower than 100 *** significantly reduces the thermal conductivity of the hybrid aerogels as predicted by Knudsen et ***,the addition of mineral fillers to aerogels based on cellulose microfibers induced a significant increase in stiffness.

关键词： Aerogels cellulose microfibers WP TEMPO-oxidized NFC silica lyophilization porosity superinsulation mechanical properties

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