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: Excited state & Catalysis. The organization has 3867 authors who have published 10457 publications receiving 220098 citations.

Surfactant-Free, Stable Noble Metal–Graphene Nanocomposite as High Performance Electrocatalyst

Abstract: Preparation of a noble metal–graphene nanocomposite (MGN)-based clean and stable catalyst with uniform distribution of ultrafine nanoparticles can greatly improve the performance of fuel cells. Here, we show that surfactant-free MGNs for different noble metals can be prepared for high-performance fuel cell catalysis by the reaction of respective ultrasmall colloidal metal oxide/hydroxides with partially reduced colloidal graphene oxide. The resultant MGN is composed of highly dispersed M–M+n based nanoparticles of ultrasmall size and produces a strong and stable catalytic current for ethanol and formic acid oxidation.

Limiting Heterovalent B-Site Doping in CsPbI3 Nanocrystals: Phase and Optical Stability

Abstract: B-site doping with various metal ions in α-CsPbI3 has been proven to be a potential approach in bringing phase stability to these nanocrystals. However, while the doping of various homovalent ions in replacing Pb(II) has been extensively studied, heterovalent doping was observed to be limited. To understand the impact of heterovalent doping, Sb(III) was chosen here as an effective dopant for occupying the Pb(II) position in CsPbI3 nanocrystals. Importantly, it was observed that insertion of Sb(III) also stabilized the crystal phase of these red-emitting nanocrystals, but only with limited doping. However, with more intake, the cube shape turned to platelet and therefore also reduced the stability. Details of the insights of formation of these doped nanostructures are investigated, and further, these were implemented for photovoltaic application and comparable efficiency was recorded.

Clathrin to Lipid Raft-Endocytosis via Controlled Surface Chemistry and Efficient Perinuclear Targeting of Nanoparticle

Abstract: Nanoparticle interacts with live cells depending on their surface chemistry, enters into cell via endocytosis, and is commonly trafficked to an endosome/lysozome that restricts subcellular targeting options. Here we show that nanoparticle surface chemistry can be tuned to alter their cell uptake mechanism and subcellular trafficking. Quantum dot based nanoprobes of 20–30 nm hydrodynamic diameters have been synthesized with tunable surface charge (between +15 mV to −25 mV) and lipophilicity to influence their cellular uptake processes and subcellular trafficking. It is observed that cationic nanoprobe electrostatically interacts with cell membrane and enters into cell via clathrin-mediated endocytosis. At lower surface charge (between +10 mV to −10 mV), the electrostatic interaction with cell membrane becomes weaker, and additional lipid raft endocytosis is initiated. If a lipophilic functional group is introduced on a weakly anionic nanoparticle surface, the uptake mechanism shifts to predominant lipid ra...