methods. Furthermore, sCO\({}_{2}\) processes are mild temperature techniques and favorable for sterilization and bioactive agent loading in biomedical fields [10; 11]. Drying in supercritical conditions goes back to 1932 [12]. In the past, supercritical drying was mainly performed in the direct route, which utilized high temperature and pressure supercritical drying of the solvent in the wet matrix. However, these solvents are typically flammable and enhance safety risks. In another method, liquid CO\({}_{2}\) was replaced by the solvent, so-called solvent exchange, and then drying at low supercritical temperature was performed [13]. Since 1994, [PERSON] et al. 's novel study became a turning point in the supercritical CO\({}_{2}\) drying process [14]. In order to fabricate crack-free silica aerogels, they used this theory that in the case of certain binary mixtures such as ethanol-CO\({}_{2}\), for each temperature, there is a pressure (critical pressure) above which the system is always in a single phase regardless of the composition. Therefore, it provided the chance to use supercritical CO\({}_{2}\) (sCO\({}_{2}\)) drying to produce aerogels in milder operation conditions and reduced drying time. Then, the next generation of biomass- and polysaccharide-based aerogels, emerged at the beginning of the twenty-first century which contrary to silica aerogels were less fragile under compression forces [3]. Benefiting from sCO\({}_{2}\) drying, the morphology of the biogel remains reasonably intact or with minimal shrinkage after drying [3; 15]. Cellulose, an amphiphilic polysaccharide consisting of linear polymer chains of \(\beta\)-1,4-linked d-glucopyranose molecules, is one of the most abundant natural polymers from renewable resources. Celluloses and its derivatives have widely been used in areas such as conductive materials, energy storage, paper industry, textiles, and pharmaceuticals [16; 17; 18; 19; 20]. Furthermore, it is one of the most aged materials that has been used to produce fibers and yarns [21]. Several processes have been described in the literature for the fabrication of cellulose aerogels (CAs) in various geometries of monoliths [22; 23], cylinders [24], and beads [25; 26] based on different types of cellulose and their derivatives. Fiber and textile production can overcome this designability limitation and enhance the flexibility and mechanical properties of aerogels by fabricating woven or nonwoven textiles from CA fibers and filaments. Furthermore, the fine structure of fibers can decrease the sCO\({}_{2}\) drying processing time from few hours to a couple of minutes since the drying procedure is dependent on the thickness and geometries of the samples. Various inorganic salt hydrates such as LiClO\({}_{4}\)-3H\({}_{2}\)O, NaSCN/KSCN/LiSCN\(\cdot\)2H\({}_{2}\)O, Ca(SCN)\({}_{2}\cdot\)6H\({}_{2}\)O and LiCl/ZnCl\({}_{2}\)/H\({}_{2}\)O have been used as efficient agents for dissolving cellulose in a wide range of degrees of polymerization [27]. For the first time, [PERSON] et al. investigated producing CAs monoliths from salt melt hydrate of cellulose and Ca(SCN)\({}_{2}\cdot\)6H\({}_{2}\)O by freeze drying [28]. [PERSON] et al. [21] produced CA fibers based on [PERSON] et al. 's work by spinning a similar solution using a thermally insulated injection device where the fibers were regenerated in an ethanol bath and later dried in sCO\({}_{2}\) as the first fabricated open porous aerogel microfibers using cellulose. [PERSON] et al. investigated the spinning dope preparation, extrusion, and characteristics of porous cellulose aerogels fibers from a similar solution and regeneration bath using a micro-extruder and sCO\({}_{2}\) drying [29]. CA fibers have been also fabricated from ZnCl\({}_{2}\) salt melt hydrate in similar processing methods in order to investigate their insulation properties in aerospace [30] and automobile applications [31].