Indian Institute of Technology Ropar

About: Indian Institute of Technology Ropar is a education organization based out in Ropar, India. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 1014 authors who have published 2878 publications receiving 35715 citations.

Systematic Investigation for the Photocatalytic Applications of Carbon Nitride/Porous Zeolite Heterojunction

Abstract: Here, we present the integration of a commercially available titanosilicate zeolite with photocatalyst graphitic carbon nitride (g-C3N4) toward the development of an effective heterojunction photocatalyst, TCN(1-8-8). The formation of this porous heterojunction and its structural details have been confirmed by X-ray diffraction, N2 adsorption, electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The visible light absorption and band structure have been determined from diffused reflectance ultraviolet–visible spectroscopy. For its fabrication, the contents of both the constituent materials have been optimized systematically. Its photocatalytic activity has been found to be impressive in the visible light-assisted degradation of a variety of water pollutants (dyes and antibiotics) and in the hydroxylation of phenol. Control experiments, radical scavenging/trapping experiments, influence of the reaction environment, and photoelectroch...

The influence of tumour blood perfusion variability on thermal damage during nanoparticle-assisted thermal therapy.

Abstract: Purpose: This study investigates the influence of blood perfusion variability within a tumour and the surrounding healthy tissue during nanoparticle-assisted thermal therapy. It seeks to define ideal therapeutic parameters for a wide range of perfusion rates to attain the desired thermal damage. Material and methods: Pennes’ bioheat model and the Arrhenius model are used to evaluate the thermal damage for a two-dimensional tumour surrounded by healthy tissue. A wide range of tumour perfusion rates were modelled, ranging from moderate to high perfusion in both a homogenously and a heterogeneously perfused tumour. Results: For low perfusion rates, a temporal variation in blood perfusion does not critically influence the thermal damage. For moderately and highly perfused tumours, temporal variation in blood perfusion extends the thermal damage zone by 25–52% compared to a constant perfusion rate. For the tumour size and perfusion conditions under consideration, the ideal therapeutic parameters were found to be irradiation intensity of 1 W/cm2, and irradiation duration of 105–150 s, for a nanoparticle volume fraction of 0.001%. Conclusions: It is concluded for low perfusion rates that due to shorter therapeutic duration, nanoparticle-assisted thermal therapy is relatively insensitive to changes in the perfusion rate during the therapy. For moderately and highly perfused tumours, a constant perfusion under-predicts the real thermal damage zone. This study concludes that for moderately and highly perfused tumours the spatial as well as temporal blood perfusion dynamics should be carefully accounted for to get a realistic estimate of thermal damage zone.

Control of radial miscible viscous fingering

Abstract: We investigate the stability of radial viscous fingering (VF) in miscible fluids. We show that the instability is determined by an interplay between advection and diffusion during the initial stage ...