Versatile Molding Process for Tough Cellulose Hydrogel Materials

Abstract

Shape-persistent and tough cellulose hydrogels were fabricated by a stepwise solvent exchange from a homogeneous ionic liquid solution of cellulose exposure to methanol vapor. The cellulose hydrogels maintain their shapes under changing temperature, pH, and solvents. The micrometer-scale patterns on the mold were precisely transferred onto the surface of cellulose hydrogels. We also succeeded in the spinning of cellulose hydrogel fibers through a dry jet-wet spinning process. The mechanical property of regenerated cellulose fibers improved by the drawing of cellulose hydrogel fibers during the spinning process. This approach for the fabrication of tough cellulose hydrogels is a major advance in the fabrication of cellulose-based structures with defined shapes.

Cellulose defibrillation and functionalization by plasma in liquid treatment

“…The cellulose suspensions (5 wt%) were prepared by dispersing 10 g MCC in 0.2 L of bi-distilled water by ultrasonication for 1 h. An ultrasonic bath Elmasonic S 15 H (Elma, Germany) was used for this purpose and a power density of 0.12 W/mL. The concentration of MCC suspension in water was chosen based on earlier reports 26 , 27 . MCC suspensions with a concentration in the range 2–10% are frequently used for surface modifications 26 – 29 .…”

“…The concentration of MCC suspension in water was chosen based on earlier reports 26 , 27 . MCC suspensions with a concentration in the range 2–10% are frequently used for surface modifications 26 – 29 . In general, higher particle concentrations result in an increased collision frequency and, possibly, to agglomerations while lower particle concentrations lead to fewer reactive sites in suspension.…”

3D Printing Cellulose Hydrogels Using LASER Induced Thermal Gelation

“…Additionally, the printed samples show that the cellulose gel is strong enough to support itself once removed from the solvent and regenerated, as also observed for cellulose gels made through the exposure of an ionic liquid solution of cellulose to methanol vapour [50]. Thus, thin layers of gel formed through residual heat of the first overhanging, could be caused by the solution being warmer at this stage of the print and as a result, the application of the same amount of power causes excess gelling.…”

Recent developments in nanotechnology transforming the agricultural sector: a transition replete with opportunities

“…Nanometre‐sized cellulose materials offer a plethora of applications and their properties are vastly distinct from the bulk cellulose of the same material. Tough cellulose hydrogels obtained by a solvent exchange method were reported for their stability under changing temperature, pH and solvents . The complete nucleotide sequence of Gluconacetobacter hansenii strain NQ5 (ATCC 53582), an efficient producer of bacterial cellulose, has been elucidated with the aim of contributing to the understanding of the molecular mechanisms involved in cellulose biosynthesis .…”

“…Tough cellulose hydrogels obtained by a solvent exchange method were reported for their stability under changing temperature, pH and solvents. 205 The complete nucleotide sequence of Gluconacetobacter hansenii strain NQ5 (ATCC 53582), an efficient producer of bacterial cellulose, has been elucidated with the aim of contributing to the understanding of the molecular mechanisms involved in cellulose biosynthesis. 206 The nanofibrillar-like network structures of holocellulose aerogels, with high surface area and high adsorption property, indicating potential application in environmentally friendly adsorption materials, were synthesised using tulip tree and an aqueous alkali hydroxide-urea solution.…”