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A study about an emerging approach to enhance the biological properties by incorporating nanoparticles within the hydrogel networks using citric acid, diethyleneglycol, and indole-3-acetic acid a three component hydrogels prepared by polycondensation. A stable and uniformly distributed silver and gold nanoparticles have been introduced successfully in hydrogel network resulted in nanocomposite hydrogels. The surface morphology of silver and gold hydrogel have been compared using scanning electron microscope with energy dispersive X-ray spectroscopy analysis and transmission electron microscopy techniques and thermal stability was studied by thermogravimetric analysis. The swelling studies have also been carried out for nanocomposite hydrogels at various pH solution. The nanocomposite hydrogels have exhibited antibacterial activity and nontoxic nature confirmed by the cytotoxicity effect. The results of the study indicated that the nanocomposite hydrogels may be recommended for wound healing applications. Comparatively, silver nanocomposite hydrogel was better performance than gold nanocomposite hydrogel. POLYM. ENG. SCI., 00:000-000,

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New temperature-responsive hydrogels containing various composition of N-acryloyl morpholine (AM) and N-isopropyl acrylamide (NIPAM) were prepared by free-radical solution polymerization using poly(ethyleneglycol) diacrylate (PEGDA) as the chemical crosslinker. The gels were responsive to changes in external temperature, and exhibited the volume phase transition phenomenon. The gels swelled extensively in water at 23 °C, with water-uptake of more than 90 % at swelling equilibrium. The influence of molecular heterogeneity of the gels in terms of comonomer and crosslinker composition on the swelling capacity and equilibrium water uptake was evaluated. The dye adsorption capacity of the gels at room temperature was studied using Congo red as a model dye. The gels displayed significant adsorption capacity of the dye, and the adsorption capacity was found to be dependent on the hydrophilic character of the gel.The characteristic adsorption parameters were determined using the Langmuir isotherm model.The value of equilibrium binding constant was below 1 which indicated favorable adsorption of dye by the hydrogels. The dye release behavior was studied below and above the volume phase transition temperature of the gels. The dye release from the gels was about 95 % at temperatures above the volume phase transition temperature of the gels. These gels can be used as reversible sorbents in the efficient removal of Congo red from waste water.A c c e p t e d M a n u s c r i p t 2 INTRODUCTION Hydrogels are cross-linked three-dimensional polymer networks that can absorb large amounts of water and remain insoluble. Depending on the nature of chemical units along the polymer chain, these materials can be made to respond to changes in certain external stimuli such as pH, temperature, ionic strength, illumination, and magnetic field (1-5), and are called stimuliresponsive, intelligent, smart, or environmentally sensitive polymers. The potential response to these stimuli is changes in phase, shape, volume or optical properties. Due to their excellent properties such as biocompatibility, elasticity, and water-uptake capacity, hydrogels have found applications in skin care products, targeted drug delivery systems, enzyme immobilizations, dye sorbents and chemical sensors (5-10). In many of these applications, the swelling property and strength of the hydrogel plays an important role which has been the subject of research interest in recent years.The development of new sorbents to remove organic or heavy metal pollutants from organic effluents produced in textile, paper, leather, and plastic industries represents an intensive and popular area of research. The main source of water and land pollution is by effluents from textile and leather industries. As a result of dying process, these industrial effluents are colored and contain synthetic organic dyes which are hazardous to the environment and biological activities in water bodies.These organic dyes are also mutagenic and carcinogenic in nature and hence very hazardous to human health...

Gold nanoparticles (AuNPs) are widely used and important nanomaterials and combine with hydrogels to design novel nanocomposite hydrogels. An emerging approach to strengthen the polymeric hydrogels and to include multiple functionalities focuses on incorporating nanoparticles within the hydrogel network. This present investigation focused on the most recent developments in the field of nanocomposite hydrogels with emphasis on biomedical applications. The pH-responsive nanocomposite hydrogels based on indole-3-acetic acid (IAA), which has extracted from leaf of Stachytarpheta jamaicensis, citric acid, diethylene glycol and colloidal gold nanoparticles. The obtained nanocomposite hydrogels found to have desired surface morphology and enhanced pH-sensitive swelling and thermal stability. The resultant nanocomposite hydrogels may be recommended for biomedical applications mere in future such as pH-sensitive drug delivery, wound healing application, anti cancer, antimicrobial material, antioxidant, cytotoxicity with more than 80% cell viability and nanomedicine.