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

作     者：Dounia Bendahou Abdelkader Bendahou Bastien Seantier Benedicte Lebeau Yves Grohens Hamid Kaddami 

作者机构：University of Southern BrittanyDupuy de Lôme Research InstituteFRE-CNRS 3744BP 9211656321 Lorient CedexFrance Cadi Ayyad UniversityFaculty of Sciences and TechnologiesAvenue Abdelkrim ElkhattabiB.P.549MarrakechMorocco University of Upper AlsaceInstitute of Materials Science of Mulhouse(IS2M)68057 Mulhouse CedexFrance 

出 版 物：《Journal of Renewable Materials》 (可再生材料杂志（英文）)

年 卷 期：2018年第6卷第3期

页      面：299-313页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：Center of Analyses and Characterizations (CAC) of Cadi Ayyad University (CAC-UCA)-Morocco, Bretagne region European Union (FEDER) French Ministry of Research 

主　　题：Aerogels cellulose microfibers WP TEMPO-oxidized NFC silica lyophilization porosity superinsulation mechanical properties 

摘      要：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.