for - scalable fabrication technique - sustainable building - insulation - windows - beer hops aerogel

scalable fabrication technique - sustainable building - insulation - windows - beer hops aerogel - This fabrication process is highly scalable (Fig. 2a–c) and compatible with roll-to-roll processing, - It combines simple steps: - Moulding to define the volume of the desired hydrogel, - Solvent exchanges at modestly elevated temperatures<br /> - Rolling and drying the gels atop plastic support in rolls - step 1 - Process wood-pulp-derived cellulose nanofibres - via 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation of native cellulose25,35,36,37 - (Methods and Supplementary Fig. 3). - This process affects the surface charges associated with the carboxylate anion preclude aggregation25,30 of the nanofibres, - which form stable aqueous colloidal dispersions at varying concentrations - step 2 - Pour solution into moulds of desired shapes and sizes - (Methods and Supplementary Figs. 3 and 4) - step 3 - Adding acid interlinks these nanofibres by hydrogen bonds between the carboxyl groups, - transforming the colloidal dispersion into a hydrogel - (Supplementary Fig. 4b) - with a network of sparse nanofibres - step 4 - Exchange the fluid medium within the gel by - replacing water with isopropanol or ethanol - (Fig. 2a,b and Supplementary Fig. 4c,d), - Step 5 - Super critically dry it to form an aerogel - (Fig. 2c and Supplementary Fig. 5a–d)