Microgel particles are emerging soft and smart materials for multiple applications including their use as adsorbent for environmental applications and as micro-reactor for in-situ fabrication of metal nanoparticles etc. The impregnation of such organic microgel particles with catalytic and optical active inorganic metal nanoparticles results in formation of hybrid materials with exceptional properties. This work encircles the synthesis of microgels with different morphologies, their use as adsorbent for environmental applications and as micro-reactor for stabilization of catalytic active metal nanoparticles. First part of the thesis emphasizes on recent research progress of the synthesis, properties, characterization and applications of microgels and hybrid microgels with different morphologies. Later, synthesis of poly(N-isopropylmethacrylamide-acylic acid) [p(NipMa-Aac)], polystyrene poly(N-isopropylmethacrylamide-acrylic acid) [PSt-p(NipMa-Aac)] core/shell microgels and silver nanoparticles loaded PSt-p(NipMa-Aac) composite microgels have been described in detail. pH responsive behavior of acrylic acid (Aac) co-monomer functionalized p(NipMa), PSt p(NipMa) and Ag@PSt-p(NipMa-Aac) core/shell hybrid microgels have also been described. Then, characterization of both pure and hybrid microgels using Fourier transform infrared spectroscopy (FTIR), Uv-vis spectroscopy (Uv-vis), dynamic light scattering (DLS), thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC) and Transmission electron microscopy (TEM) has been described. Use of p(NipMa-Aac) microgel particles and PSt-p(NipMa-Aac) core/shell microgel particles as adsorbents for removal of various pollutants such as dyes and heavy metal ions from iii aqueous medium have been discussed in detail. At the end of thesis, applications of Ag@PSt p(NipMa-Aac) core/shell composite microgel particles as catalyst for reduction of various nitro aromatic compounds such as 2-nitrophenol (2-Np), 4-nitrophenol (4-Np), 2, 4-dinitrophenol (2, 4-DNp), 4-Nitrotoluene (4-NT) and 4-chloro nitrobenzene (4-CNb) as well as toxic dyes such as Congo red (CR), Rhodamine B (Rh-B), methylene blue (MB) and brilliant blue (Bb) under various reaction conditions to explore the mechanism of catalysis process have been described. Recoverability and reusability of Ag@PSt-p(NipMa-Aac) core/shell composite micro particles catalyst was also investigated.
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