Effect of thermal annealing on a bilayer polyvinyl alcohol/polyacrylic acid electrospun hydrogel nanofibres loaded with doxorubicin and clarithromycin for a synergism effect against osteosarcoma cells

Green Electrospinning of Chitosan/Pectin Nanofibrous Films by the Incorporation of Cyclodextrin/Curcumin Inclusion Complexes: pH-Responsive Release and Hydrogel Features

“…In another study, Miranda et al used the PVA/polyaniline (PANI) blend to produce hydrogel NF and reported a swelling ratio of ∼600% . As observed, the swelling ratios that we found in our study are correlated with the previous ones in which highly hydrophilic polymer types were used to generate electrospun hydrogel-featured NFs and this suggested the hydrogel-forming capability of our samples. − For degradation tests in PBS buffer (pH 7.4), each sample independent of their compositions degraded ≥87% ( p < 0.05: significantly different) (Figure c). The percentages for the thermally treated samples implied that the high concentration of HPγCD within the NF (∼88 to 91%, w/w) had the most influence on degradation of the samples due to a significantly high aqueous solubility of HPγCD (≥500 mg/mL) .…”

“…When the previous studies were inspected, Koosha et al and Sazegar et al reported ∼400 and ∼3356% swelling ratios for the electrospun NF of chitosan/poly­(vinyl alcohol) (PVA) blends, respectively, which were cross-linked using different cross-linkers. On the other hand, Chee and co-workers claimed a 400–600% swelling ratio for the PVA/polyacrylic acid (PAA) bilayer NF . In another study, Miranda et al used the PVA/polyaniline (PANI) blend to produce hydrogel NF and reported a swelling ratio of ∼600% .…”

Highly efficient and reusable polymeric nanofibers for cationic dye removal: isotherm, kinetics and thermodynamic study

“…An endothermic peak was observed in the temperature range of 40–60 °C and is attributed to the evaporation of water adsorbed from PVA NFs. 22 It is noted that there is an endothermic peak at 112 °C, which is related to the T g of the PVA, whereas the crosslinked PVA/PANa NFs do not exhibit any peak in that range, indicating that the crosslinking prevented the movement of the chains. The PVA NFs exhibited an endothermic peak at approximately 189 °C whereas the PVA/PANa NFs showed the endothermic peak around 225 °C.…”

Design of a novel green bio-based organic–inorganic hybrid material for cost-effective and sustainable monitoring of antibiotic residues

“…It is worth mentioning that heat treatment is an important step in controlling the structural morphology of the materials, which can improve the water stability of composites. 58 Therefore, the effect of different drying temperatures on the water stability of PVA/SHA films was investigated. After drying the PVA/SHA film at different temperatures and then soaking in water for up to 2 hours.…”

“…The main reason for this phenomenon is that at lower drying temperatures, the cross-linking reaction of PVA and SHA may be incomplete. 58 PVA and HA will produce many free –OH and –COOH functional groups which can form hydrogen bonds with H 2 O, and then SHA will enter the water solution showing a yellow colour. 59 As the drying temperature was further increased to 140 °C, due to the efficient removal of both physically bound and free water from the composite film, the self-crosslinking of PVA and the cross-linking reaction between PVA and SHA become more complete, and a more compact network structure can be formed.…”