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.

Giant magnetoresistance and large inverse magnetocaloric effect in Ni2Mn1.36Sn0.64 alloy

Abstract: The magnetoresistance (MR) behaviour and the magnetocaloric effect (MCE) of the ferromagnetic shape memory alloy of nominal composition Ni2Mn1.36Sn0.64 have been investigated. We observe giant negative MR (~ − 48% at 90 kOe) around the martensitic transition (MT) temperature. The observed MR was found to be irreversible with respect to the applied magnetic field, particularly in the vicinity of MT. The sample exhibits a large but positive magnetocaloric effect (a peak value of 5.1 J kg−1 K−1 for the magnetic field changing from 0 to 20 kOe) around MT. A comparison with the other Ni–Mn-based shape memory alloys indicates that the observed MR scales with the magnitude of the MCE.

Hydrogen-Bonded Assembly of Water and Chloride in a 3D Supramolecular Host

Abstract: The hydrogen-bonded water-chloride assembly {[(H2O)14Cl2]2-}n, which is stabilized in a template of metal organic supramolecular host (MOSH) {[Cu4(phen)4(adi)(OH)2Cl2]2+}n(adi = adipate dianion; phen = 1,10-phenanthroline), was isolated. DFT calculations corroborate the X-ray crystal structure of the hydrogen-bonded water-chloride assembly. The variable temperature magnetic study also corroborates the single-crystal structure.

Acid−Base Equilibrium at an Aqueous Interface: pH Spectrometry by Heterodyne-Detected Electronic Sum Frequency Generation

Abstract: We applied interface-selective heterodyne-detected electronic sum frequency generation (HD-ESFG) to the pH spectrometry of an air/cationic surfactant/water interface in order to obtain insight into an acid−base equilibrium at the interface. We used an indicator molecule adsorbed at the interface to probe local pH and local effective polarity. We obtained unprecedentedly high quality spectral data of the interfacial pH spectrometry, which clearly indicates that this interface has higher pH than the bulk owing to the positive charge of the head group of the surfactant. In addition, we found that the air/surfactant/water interface and the micelle interface of the same surfactant are essentially equivalent in local pH and local effective polarity.