http://hdl.handle.net/2080/19 2026-04-14T17:23:45Z 2026-04-14T17:23:45Z Mahapatra, Somnath Garnayak, Susmita Kumar, Pawan http://hdl.handle.net/2080/5772 2026-04-13T07:12:10Z 2026-03-01T00:00:00Z

Title: Tuning the Band Gap of BaTiO3 by rGO Incorporation for Photovoltaic Application Authors: Mahapatra, Somnath; Garnayak, Susmita; Kumar, Pawan Abstract: Band-gap engineering of ferroelectric oxides is an effective approach to enhance photo response for photovoltaic applications. In this study, rGO-incorporated BaTiO₃ nanocomposites were developed to tailor the band gap, improve visible-light absorption, and enhance charge transport. The presence of rGO introduces defect states and facilitates efficient charge separation, resulting in improved photocurrent, photodiode sensitivity, and photocatalytic activity. These multifunctional composites show strong potential for photovoltaic, photodetector, and environmental remediation applications. Description: Copyright belongs to the proceeding publisher.

2026-03-01T00:00:00Z Sharma, Hrishita Kalita, Deepjyoti Mirza, Khalid B. http://hdl.handle.net/2080/5771 2026-04-13T07:12:02Z 2026-02-01T00:00:00Z

Title: Impact of Gold Coating Methods On Sensing Performance of Enzymatic Glucose Sensors Authors: Sharma, Hrishita; Kalita, Deepjyoti; Mirza, Khalid B. Abstract: Glucose sensors necessitate a layer of gold or platinum on electrode surface for functionalisation. There are different methods to coat gold on metallic or polymer surfaces. These range from sputter coating to dropcasting and electroplating. In order to investigate the impact of electrode surface modification on sensor sensitivity, three fabrication methods were used: unmodified electroless nickel immersion gold (ENIG) PCB electrodes, electrodes modified by drop-casting gold solution, and electrodes prepared via electrochemical gold deposition. Cyclic voltammetry, Scanning electron Microscopy (SEM) and amperometric calibration were used to evaluate the morphological and electrochemical properties for the three fabrication methods. The results show that surface modification by electroplating a highly porous gold (hpg) film on the surface greatly improves sensitivity by increasing active surface area and improving enzyme immobilization, with the sensor exhibiting a sensitivity of 6.45 μA/mM compared to 5.65 μA/mM, 2.48 μA/mM and 1.89 μA/mM respectively for Au sputter, dropcasted gold and ENIG. Description: Copyright belongs to the proceeding publisher.

2026-02-01T00:00:00Z Sethy, Sagardatta Kumar, Sumit http://hdl.handle.net/2080/5770 2026-04-13T07:11:54Z 2026-03-01T00:00:00Z

Title: Numerical Investigation of Nanoparticle Distribution Strategies in Nano Cryosurgery of Axisymmetric Biological Tissue Authors: Sethy, Sagardatta; Kumar, Sumit Abstract: Cryosurgery is a minimally invasive technique used to destroy tumors by freezing them with extreme cold. However, its effectiveness is limited by the inherently low thermal conductivity of biological tissue, which restricts heat transfer and may result in incomplete tumor ablation or unintended damage to surrounding healthy tissue. This study numerically investigates the use of Magnesium Oxide (MgO) nanoparticles to enhance thermal transport during cryosurgery. MgO nanoparticles are selected due to their relatively high thermal conductivity, chemical stability, biocompatibility, and potential biodegradability, making them suitable for biomedical applications. A two-dimensional axisymmetric computational model of biological tissue containing a tumor was developed in ANSYS Fluent based on the Pennes bioheat equation, incorporating phase change to simulate the freezing process. The effective density, specific heat, and thermal conductivity of nanoparticle-enhanced tissue were calculated using the Maxwell–Eucken model at a 3% volume fraction. Three nanoparticle distribution strategies were analysed nanoparticles dispersed in surrounding tissue, nanoparticles injected directly into the tumor, and nanoparticles present in both regions. The results show that nanoparticle inclusion significantly improves freezing efficiency. The configuration with nanoparticles concentrated in the tumor produces the largest and fastest-forming lethal iceball. These findings suggest that increasing tumor thermal conductivity using MgO nanoparticles enhances cryoprobe performance, shortens freezing time, and improves the precision of cryosurgical treatment. Description: Copyright belongs to the proceeding publisher.

2026-03-01T00:00:00Z Mahaling, Tushar Kanta Satapathy, A.K. http://hdl.handle.net/2080/5769 2026-04-13T07:11:45Z 2026-03-01T00:00:00Z

Title: Numerical Thermo-Hydraulic Performance Analysis of Serpentine, Distributor, and Parallel Microchannel Heat Sink Authors: Mahaling, Tushar Kanta; Satapathy, A.K. Abstract: The increasing power density of modern electronic devices, compact energy systems, and advanced battery technologies has created significant challenges in thermal management under high heat flux conditions. Efficient cooling is essential to maintain system reliability and performance. Microchannel heat sinks have emerged as an effective solution due to their high surface-to-volume ratio and enhanced convective heat transfer capability. However, their thermal performance strongly depends on channel configuration and coolant flow distribution. In this study, a three-dimensional numerical investigation is conducted to compare the thermo-hydraulic performance of three microchannel configurations: serpentine, parallel, and distributor-based layouts. Steady-state laminar flow simulations are performed using ANSYS Fluent, with deionized water as the coolant and a uniform heat flux applied at the base of an aluminum heat sink. The performance of each configuration is evaluated in terms of temperature distribution, flow uniformity, thermal resistance, and pressure drop. The results show that the serpentine configuration improves temperature uniformity but leads to higher pressure drop. The parallel configuration reduces hydraulic losses but suffers from flow maldistribution. In contrast, the distributor configuration provides improved flow distribution and achieves a balanced thermohydraulic performance with moderate pressure drop and effective heat removal. This comparative study provides useful insights for optimizing microchannel heat sink designs for high heat flux electronic cooling applications. Description: Copyright belongs to the proceeding publisher.

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