Composite effect of silica nanoparticle on the mechanical properties of cellulose‐based hydrogels derived from cottonseed hulls

Abstract

Recently, cellulose-based hydrogel nanocomposite materials have been attracted increasing attention owing to their potential applications in different areas including medical, electrical, optical, and magnetic fields. This is due to the fact that cellulose is one of the most abundant resources and possesses several unique properties required in medical fields, whereas silica nanoparticles (nSiO 2 ) play an important role in developing materials with high functionality. In this study, cottonseed hull (CSH) was used as a source of cellulose and nSiO 2 was used to prepare hydrogel nanocomposite films via phase inversion method without chemical crosslinking agent of cellulose. CSH was first pre-treated with sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl) for delignification and bleaching, respectively. The pre-treated CSH exhibited whiter fiber and lower amount of lignin as compared with the untreated CSH. The properties of cellulose-base hydrogel were found to be improved as a result of the addition of nSiO 2 at 2-6 wt % for tensile strength and up to 10 wt % for modulus and elastic modulus (G 0 ). However, the elongation at break was decreased with the incorporation of nSiO 2 . Moreover, the TEM images displayed the nano-grape structure of nSiO 2 surrounded by cellulose molecules.

Preparation of Cellulose-Based Hydrogel Derived From Tea

“…Moreover, typical peaks of hemicellulose and lignin components are noted at 1711 and 1517 cm -1 , which contributed to C=O and C-H bonds, respectively. 15 However, as shown in Figure 5 (b), the FT-IR spectrum of the extracted cellulose revealed a reduction in the content of hemicellulose and lignin by the decrease in the intensity of the peaks at 1711 cm -1 and 1517 cm -1 . Also, the intensity of the peak at 1605 cm -1 assigned to O-H stretching of the free water molecules was enhanced, suggesting the hydrophilicity of the prepared cellulose.…”

Strategy for Preparing Mechanically Strong Hyaluronic Acid–Silica Nanohybrid Hydrogels via In Situ Sol–Gel Process

“…In addition, the high density of silanol groups (Si-OH) exposed in the nanoscale microstructure of silica with high surface area effectively formed hydrogen bonds with HA, which collectively contributed to enhancing the mechanical properties of the hybrid hydrogels. [35] Degradation tests were performed in the presence of hyaluronidase (50 U mL −1 in PBS, pH 7.4), and the weight change of the specimens was monitored, as shown in Figure 3E,F. Within 1 day, the HA hydrogel was fully digested by the enzymatic hydrolysis; however, all the weights of the HA-silica nanohybrid hydrogels were maintained with only a slight decrease until 16 days.…”

“…The interconnected silica network effectively transferred the external load, and the porous and homogeneous structure made it possible for the hydrogels to resist high strain. In addition, the high density of silanol groups (Si–OH) exposed in the nanoscale microstructure of silica with high surface area effectively formed hydrogen bonds with HA, which collectively contributed to enhancing the mechanical properties of the hybrid hydrogels …”

Chitin‐halloysite nanoclay hydrogel composite adsorbent to aqueous heavy metal ions

“…Among the bio‐adsorbent material, hydrogel has gain much attraction due to the hydrophilic structure of which renders them capable of holding large amounts of water in their three‐dimensional networks . According to that purpose, biopolymer‐based hydrogels are significantly attractive because they are capable of lowering metal ion concentrations in waste water, and widely available.…”

“…2 Among the bio-adsorbent material, hydrogel has gain much attraction due to the hydrophilic structure of which renders them capable of holding large amounts of water in their three-dimensional networks. [3][4][5] According to that purpose, biopolymer-based hydrogels are significantly attractive because they are capable of lowering metal ion concentrations in waste water, and widely available. Biopolymer hydrogels sourced from plants or animal derived macromolecules, in general, have several unique properties of being environmentally benign, low cost, effective at low metal concentrations, and easily reusable.…”