Enhanced mechanical stability and sensitive swelling performance of chitosan/yeast hybrid hydrogel beads

Abstract

Up to the present time, improving the mechanical stability of hydrogel beads is still a challenging task for future applications of chitosan hydrogels.

Characterization of slow‐release collagen‐g‐poly(acrylic acid‐co‐2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid)–iron(III) superabsorbent polymer containing fertilizer

“…This difference may have arisen from a charge screening effect caused by the excess cations, which resulted in an imperfect anion–anion electrostatic repulsion and a decreased osmotic pressure between the inside and outside of the network . Meanwhile, the effect of various cations on the swelling of sample were in the order Ca 2+ < Mg 2+ < Na + < K + , respectively; this was in accordance with research by Feng . Moreover, the curve of the water absorbency of the monovalent cationic salt solution was flatter than those of the divalent cationic salt solution because of the complexation ability of the multivalent cationic solutions.…”

“…3 Meanwhile, the effect of various cations on the swelling of sample were in the order Ca 2+ < Mg 2+ < Na + < K + , respectively; this was in accordance with research by Feng. 33 Moreover, the curve of the water absorbency of the monovalent cationic salt solution was flatter than those of the divalent cationic salt solution because of the complexation ability of the multivalent cationic solutions. A possible explanation is that the ionic crosslinking points in the polymer networks were generated by the complexation of carboxylate and carboxamide groups with polyvalent cations; this led to a denser network structure, which was the decisive factor in the poor swelling capacity.…”

Curing of polyfurfuryl alcohol resin catalyzed by a homologous series of dicarboxylic acid catalysts. II. Swelling behavior and thermal properties

“…Initially, the rate of solvent absorption increases and then reaches to plateau. Dynamic swelling behavior can be expressed using a Voigt model which consists of a spring and dashpot in parallel: where S t and S e are swelling at time t and equilibrium (g/g), respectively. t denotes time of swelling (in day) at S t .…”

“…Solvent uptake ratio of the swollen networks was determined according to eq. : where W d and W s denote the weights of crosslinked network of PFA in dry and swollen state, respectively. Equilibrium swelling ratio (ESR) was also determined according to eq.…”

Magnetic Fe3O4@Chitosan Carbon Microbeads: Removal of Doxycycline from Aqueous Solutions through a Fixed Bed via Sequential Adsorption and Heterogeneous Fenton-Like Regeneration

“…In Figure 2, the IR spectrum of MCM was very similar to that of CSM, indicating that the introduction of magnetic particles did not destroy the function groups of chitosan. For CSM, the peak at 3366 cm −1 resulted from axial stretching vibration of O-H superimposed on the N-H stretching band and intermolecular hydrogen bonds of the polysaccharide [33], and the adsorption peaks at 2919 and 2874 cm −1 are assigned to the stretching vibration of C-H. The typical band of primary amine groups (-NH 2 ) appears at 1655 cm -1 [34].…”