Starch modified polyol based tough, biodegradable, biocompatible hyperbranched polyurethane with excellent thermoresponsive shape memory behavior near body temperature was demonstrated.
Development of a bio-based smart implantable material with multifaceted attributes of high performance, potent biocompatibility and inherent antibacterial property, particularly against drug resistant bacteria, is a challenging task in biomedical domain. Addressing these aspects at the bio-nano interface, we report the in situ fabrication of starch modified hyperbranched polyurethane (HPU) nanocomposites by incorporating different weight percentages of carbon dot-silver nanohybrid during polymerization process. This nanohybrid and its individual nanomaterials (Ag and CD) were prepared by facile hydrothermal approaches and characterized by various instrumental techniques. The structural insight of the nanohybrid, as well as its nanocomposites was evaluated by TEM, XRD, FTIR, EDX and thermal studies. The significant improvement in the performance in terms of tensile strength (1.7 fold), toughness (1.5 fold) and thermal stability (20 °C) of the pristine HPU was observed by the formation of nanocomposite with 5 wt.% of nanohybrid. They also showed notable shape recovery (99.6%) and nearly complete self-expansion (>99%) just within 20s at (37 ± 1) °C. Biological assessment established in vitro cytocompatibility of the HPU nanocomposites. The fabricated nanocomposites not only assisted the growth and proliferation of smooth muscle cells and endothelial cells that exhibited reduced platelet adhesion but also displayed in vitro hemocompatibility of mammalian RBCs. Significantly, the antibacterial potency of the nanocomposites against Escherichia coli MTCC 40 and Staphylococcus aureus MTCC 3160 bacterial strains vouched for their application to countercheck bacterial growth, often responsible for biofilm formation. Thus, the present work forwards the nanocomposites as potential tough infection-resistant rapid self-expandable stents for possible endoscopic surgeries.
A starch based sustainable high performing tough hyperbranched epoxy thermoset with exceptionally high tensile adhesive strength, and biodegradability was demonstrated.
Rising awareness
pertaining to global waste management and environmental
issues challenges the development of an efficient metal-free photocatalytic
system for visible light-assisted degradation of organic contaminants.
We herein report the synthesis of biobased luminescent reduced carbon
nanodots (RCDs) (3 nm average size) by green reduction of starch-based
carbon nanodots (CDs) using aqueous extracts of Calocasia
esculenta leaf, Mesua ferrea Linn leaf,
tea leaf, and flower bud of Syzygium aromaticum.
The reduction was found to be ultrafast (3 min) under sonication using Calocasia esculenta leaf extract in the presence of Fe3+ ions at room temperature. The synthesized RCD is an efficient
photocatalyst for the degradation of model dirt like methylene blue,
methyl orange, and their mixture as well as toxic chemicals like bisphenol
A under normal sunlight. These degradations followed the pseudo-first-order
kinetics model. The catalytic efficiency of RCD was significantly
higher than that of CD. The structure of RCD was characterized by
UV–visible, Fourier transform infrared, energy-dispersive X-ray,
and Raman spectroscopic analyses as well as X-ray diffraction and
transmission electron microscopic studies. The photoluminescence characteristic
of RCD was analyzed by fluorescence spectroscopy. The results showed
that exploration of sustainable resource-based RCD may offer a novel
scope in resolving environmental and ecological problems.
Tough smart starch modified hyperbranched polyurethane/reduced graphene oxide–silver–reduced carbon nanodot nanocomposites with self-healing and self-cleaning attributes under a sustainable energy source.
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