Shiv Nadar University

About: Shiv Nadar University is a education organization based out in Dadri, Uttar Pradesh, India. It is known for research contribution in the topics: Population & Graphene. The organization has 1015 authors who have published 1924 publications receiving 18420 citations.

Isomannide-Derived Chiral Rigid Fully Biobased Polybenzoxazines

Abstract: Biobased phenols and amines are attractive feedstock in rapid emerging polybenzoxazine thermosets. Renewable benzoxazines are mainly monofunctional due to structure limitation of raw materials, esp...

Dually crosslinked injectable hydrogels of poly(ethylene glycol) and poly[(2-dimethylamino)ethyl methacrylate]-b-poly(N-isopropyl acrylamide) as a wound healing promoter.

Abstract: Rapid gelation, low heat generation, biocompatibility, biodegradability, avoiding the use of a small molecular weight gelator and high gel fraction are the essential criteria for the successful biomedical application of an injectable hydrogel We have developed a series of dually crosslinked injectable hydrogels of PEG and poly[2-(dimethylamino)ethyl methacrylate]-b-poly(N-isopropyl acrylamide) through extremely simple chemistry The sequential nucleophilic substitution reaction between PEG containing reactive termini and the copolymer provided chemically crosslinked hydrogels with a gel fraction as high as 96–99% with a gelation time of 1–4 min under physiological conditions The gelation occurred with ca 1 °C rise in temperature per gram of the injectable solution, avoids formation of by-products and can be performed in the temperature range of 20–37 °C The hydrogels undergo hardening at a physiological temperature as confirmed by rheological experiments The gelation time, water swelling, mechanical properties and degradability of the hydrogels depend on the PEG to copolymer ratio in the injectable solution The rheological behaviour of the fully hydrated hydrogels showed desirable mechanical properties for soft tissue regeneration The hydrogels exhibited blood compatibility and retained the viability of HepG2 cells with time Platelet adhesion and aggregation followed by fibrinogen adsorption ability makes these hydrogels suitable for wound healing applications

Fatigue crack growth simulations of 3-D linear elastic cracks under thermal load by XFEM

Abstract: This paper deals with the fatigue crack growth simulations of three-dimensional linear elastic cracks by XFEM under cyclic thermal load. Both temperature and displacement approximations are extrinsically enriched by Heaviside and crack front enrichment functions. Crack growth is modelled by successive linear extensions, and the end points of these linear extensions are joined by cubic spline segments to obtain a modified crack front. Different crack geometries such as planer, non-planer and arbitrary spline shape cracks are simulated under thermal shock, adiabatic and isothermal loads to reveal the sturdiness and versatility of the XFEM approach.