http://localhost:8081/jspui/handle/123456789/4969 2026-05-07T20:56:07Z 2026-05-07T20:56:07Z Trivedi, Pramanshu http://localhost:8081/jspui/handle/123456789/18766 2026-01-29T11:54:24Z 2014-06-01T00:00:00Z

Title: STUDY ON BIOCOMPATIBILITY OF Zr ALLOY AND Mg COMPOSITE USED FOR ORTHOPEDIC APPLICATIONS Authors: Trivedi, Pramanshu Abstract: The area of tissue engineering has advanced dramatically in the last 10 years, tissue engineering offers the potential for regenerating possibly all tissue and organ of the human body. Tissue engineering and the related discipline of regenerative medicine remain a flourishing area of research with potential new treatments for many more disease states. The advances involve researchers in a multitude of disciplines, including cell biology, biomaterials science, imaging, and characterization of surfaces and cell material interactions. Tissue engineering aims to restore, maintain, or improve tissue functions that are defective or have been lost by different pathological conditions, either by developing biological substitutes or by reconstructing tissues. In present study biocompatibility of Zircaloy-2 and Mg composite has been evaluated, for their potential application as orthopedic implant. The multimodal structure, i.e. the combination of coarse, ultrafine gained (UFG) and nanograined structure of Zircaloy-2 is obtained by cryorolling the bulk alloy followed by annealing at 400° C, and 450° C for 30 minutes. An estimation of surface wettability of the alloy was obtained through contact angle measurement. The bioactivity of the alloy samples was investigated by incubating bone marrow derived stem cells. The cellular attachment, adhesion and proliferation at different intervals of incubation were characterized by scanning fluorescent microscopy and MTT assay. Cell culture results indicated that liquid nitrogen rolled alloy samples exhibited excellent in-vitro biocompatibility together with satisfactory bioactivity. Excellent genomic expressions were observed for Zircaloy-2 processed by cryorolling. Corrosion behavior was tested using cyclic polarization with 3.5% NaCl. or Whereas the Mg-HA(Mg-Hydroxyapatite) composite was fabricated through mixing of powders via ultrasonication followed by sintering at 5500 for 3 hours. Structural analysis was performed by using XRD; powder morphologies were determined through SEM. In order to evaluate the hydrophilicity contact angle with water drop on the implant surface was measured. For the composition and distribution of the elements EDAX mapping were performed. Biocompatibility was tested by incubating bone morrow derived stem cell on the composite surface for the time interval of I and 3 days hours. Corrosion behavior was tested using Tafel analysis with 3.5% NaCl. For the convinience of undrstanding I have divided the thesis into two parts, first part contains the studuy on biocompatbility of Zircconium alloy, whereas the second part of the thesis represents the Biocompatibility study of Mg-HA functionally graded composite.

2014-06-01T00:00:00Z Gupta, Sneha http://localhost:8081/jspui/handle/123456789/18688 2026-01-19T11:22:21Z 2024-05-01T00:00:00Z

Title: STUDY OF PEROVSKITE OXIDE BASED HETEROJUNCTION SYSTEMS AND THEIR INTERACTION WITH NATURALLY OCCURRING DYE MOLECULES Authors: Gupta, Sneha Abstract: In this study, addressing the escalating global energy demand stands as one of the paramount challenges of our time. The widespread use of non-renewable fossil fuels has led to severe environmental pollution, while rapid industrialization has exacerbated water contamination, rendering many conventional solutions ineffective, costly, or time-consuming. In recent years, there has been a surge of interest in heterojunction photocatalysts as an environmentally friendly solution to convert organic pollutants into harmless compounds under sunlight exposure. Heterojunction photocatalysts are prized for their unique properties, offering a simple and cost- effective means of wastewater purification, particularly for dye removal. Our research involved synthesizing parent compounds such as BaTiO3, Bi12TiO20, and BaBiO3, each with distinct band gaps confirmed through P-XRD analysis. Heterojunction systems, including BaTiO3/Bi12TiO20 and BaTiO3/Bi12TiO20 with varying stoichiometry and BaTiO3 / BaBiO3, were investigated, resulting in either extended absorption or a reduced band gap as compared to their parent compounds. Zeta potential measurements provided insights into surface charge, revealing a notable positive potential shift for BaTiO3 at lower pH levels. Leveraging this understanding, we explored heterojunctions between Malabar spinach fruit dye, rich in anthocyanin pigment, and adsorbed dye on the compound at different pH levels to study their interactions. UV-Vis DRS analysis was employed to determine band gaps, offering valuable insights into the potential photocatalytic activity of the synthesized compounds.

2024-05-01T00:00:00Z Khan, Shireen http://localhost:8081/jspui/handle/123456789/18687 2026-01-19T11:22:06Z 2024-05-01T00:00:00Z

Title: SOL-GEL SYNTHESIS OF RUTILE TIO2 NANOPARTICLES AND ITS APPLICATION IN DEGRADATION OF METHYLENE BLUE AND CONGO RED DYE Authors: Khan, Shireen Abstract: The synthesis of rutile titanium dioxide (TiO2) nanoparticles using the sol-gel method is investigated for its potential application in degradation of methylene blue and congo red dye. The sol-gel technique offers precise control over particle size, morphology, and surface properties, thus enhancing photocatalytic efficiency. The synthesis process involves the hydrolysis and condensation of titanium precursor under controlled conditions to form a stable sol, followed by gelation and calcination to obtain rutile TiO2 nanoparticles. Various characterization techniques such as UV-Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared radiation (FTIR), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), DLS (Dynamic light scanning), and Zeta potential, were employed to analyze the structural, morphological, and surface properties of the synthesized nanoparticles. The photodegradation activity of dye (methylene blue, congo red) under direct sunlight was carried out by synthesized rutile TiO2 nanoparticles. The results demonstrate the effectiveness of the synthesized rutile TiO2 nanoparticles in dye degradation, highlighting their potential for environmental remediation and wastewater treatment applications.

2024-05-01T00:00:00Z Ingalagi, Nikhita H http://localhost:8081/jspui/handle/123456789/18686 2026-01-19T11:21:53Z 2024-05-01T00:00:00Z

Title: SYNTHESIS OF CdO NANOPARTICLES, Ag-CdCO3, Ag-CdO and CdO-CdS NANOCOMPOSITES FOR NOVEL APPLICATIONS Authors: Ingalagi, Nikhita H Abstract: The present study deals with the synthesis and characterization of nanoparticles and nanocomposites and their applications. In the present study, CdO nanoparticles were synthesized via homogeneous precipitation method. The synthesized nanoparticles were characterized using XRD, TGA, FT-IR, DRS, and FESEM. FESEM images of the synthesized CdO nanoparticles show cubic like morphology. CdO nanoparticles show photo-degradation of congo red. Nanocomposites have intriguing physicochemical properties in comparison with their constituents, making them potentially useful in a variety of fields such as biomedicine, photocatalysis, sensors, and optoelectronics. Although there are many chemical and physical methods for the synthesis of nanocomposites, simple, cost-effective, and environmentally friendly methods are often explored. In the present study, Ag-CdCO3 nanocomposites were synthesized using a novel approach. First, CdCO3 particles with cubic morphology were synthesized by homogeneous precipitation method, starting from cadmium salts and urea. Then, the CdCO3 particles were surface modified using ammonium oxalate. The surface modification of CdCO3 was confirmed using FT-IR and TG analysis. Ag nanoparticles were then deposited on CdCO3 cubes using an electroless deposition method using AgNO3 and aqueous HCHO to obtain Ag-CdCO3 nanocomposites. The Ag-CdCO3 nanocomposite was then calcined at 500 °C to form the Ag-CdO nanocomposite. The Ag-CdCO3 and Ag-CdO nanocomposites were characterized using XRD, FTIR, FE-SEM, EDX, DRS, etc. The characterization results indicate successful formation of Ag-CdCO3 and Ag-CdO nanocomposites. Ag-CdCO3 nanoparticles possess better antibacterial activity at 100 μg/mL of concentration against GFP E. coli and show 35 mm of zone of inhibition. Ag-CdCO3 and Ag-CdO exhibit good antibacterial activity and can be used for further application in reducing bacterial infection. Reduction of 4-nitrophenol into 4-aminophenol by Ag-CdCO3 nanoparticles was also done. The Ag-CdCO3 nanocomposite takes only 10 minutes to reduce 4-nitophenol.

2024-05-01T00:00:00Z