TY  - EJOU
AU  - Bendahou, Dounia 
AU  - Bendahou, Abdelkader 
AU  - Seantier, Bastien 
AU  - Lebeau, Bénédicte 
AU  - Grohens, Yves 
AU  - Kaddami, Hamid 

TI  - Structure-Thermal Conductivity Tentative Correlation for Hybrid Aerogels Based on Nanofibrillated Cellulose-Mesoporous Silica Nanocomposite
T2  - Journal of Renewable Materials

PY  - 2018
VL  - 6
IS  - 3
SN  - 2164-6341

AB  - 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, etc. These composites are compared to those previously prepared using nanozeolites (NZs) as mineral charge. The 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 concentrations. These hybrid materials exhibit tunable thermal conductivity and mechanical properties. The thermal conductivity values range between ~18 to 28 mW. m–1. K–1and confirm the superinsulation ability of these fibrous aerogels. Synergism 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 nm. It significantly reduces the thermal conductivity of the hybrid aerogels as predicted by Knudsen et al. Furthermore, the addition of mineral fillers to aerogels based on cellulose microfibers induced a significant increase in stiffness.
KW  - Aerogels
KW  -  cellulose microfibers WP
KW  -  TEMPO-oxidized NFC
KW  -  silica
KW  -  lyophilization
KW  -  porosity
KW  -  superinsulation
KW  -  mechanical properties

DO  - 10.7569/JRM.2017.634185