Indian Association for the Cultivation of Science

About: Indian Association for the Cultivation of Science is a education organization based out in Kolkata, India. It is known for research contribution in the topics: Catalysis & Excited state. The organization has 3867 authors who have published 10457 publications receiving 220098 citations.

A Thiadiazole-Based Covalent Organic Framework: A Metal-Free Electrocatalyst toward Oxygen Evolution Reaction

Abstract: Covalent organic frameworks (COFs) have attracted surging interest lately due to their wide potential in several frontline application areas like gas storage, sensing, photovoltaics, fuel cells, ac...

Vickers microhardness studies on solution-grown single crystals of magnesium sulphate hepta-hydrate

Abstract: A Vickers microhardness study has been carried out on (1 0 0) and (0 1 0) faces of solution-grown single crystals of magnesium sulphate hepta-hydrate (MgSO 4 ·7H 2 O) over a load range of 10–80 g. The Vickers hardness numbers ( H v ) are found to decrease initially with increase in load and then appear to level-off. The (1 0 0) face is the softest one. The Meyer index ‘ n ’ of the two faces is less than 2 as expected theoretically if the particular crystal system belongs to the soft material category. Neither Kick's law nor Hays and Kendall's law can fully explain the nonlinear variation of microhardness with load. Instead, preference is given to Li and Bradt's proportional specimen resistance (PSR) model. The elastic stiffness coefficient, c 11 , has also been calculated using Wooster's empirical relation from the hardness data and it shows reasonable agreement with a reported value. A hardness anisotropy for both planes has been observed in accordance with the orientation of the crystallographic planes.

Optical Properties of the Type-II Core−Shell TiO2@CdS Nanorods for Photovoltaic Applications

Abstract: The well-known surface-functionalized method has been employed to synthesize TiO2@CdS core−shell nanorods using citric acid as a surface-functionalized agent. By varying the concentration of the citric acid, core−shell nanorods of core diameter 36 nm with different shell thickness (19−34 nm) were formed. The UV−visible absorption spectra of the core−shell nanorods show a red shift of the band edge of uncoated TiO2, and the broadening of the absorption spectra is also observed with shell growth. Steady-state photoluminescence (PL) spectra of the core−shell nanorods give a new emission in the visible region and also red shift with the increasing shell thickness. Decay kinetics indicate that the average lifetime ⟨τ⟩ of the core−shell nanorods is larger than that of the uncoated TiO2, and it varies from nanoseconds to picoseconds. The current−voltage (I−V) curves of the core−shell nanorods give a photocurrent density that is 212 times greater than the dark current density.