Government College

About: Government College is a based out in . It is known for research contribution in the topics: Population & Ring (chemistry). The organization has 4481 authors who have published 5986 publications receiving 57398 citations.

Fluorescence-based sensors as an emerging tool for anion detection: mechanism, sensory materials and applications

Abstract: Negatively charged ions are an integral part of our ecosystem, where at certain concentrations (fixed by the Environmental Protection Agency (EPA) and World Health Organization (WHO)), they are non-toxic. However, with an increase or decrease in their concentration due to pollution, industrialization, etc., anions show harmful effects. Therefore, the detection of anions with high sensitivity and selectivity is necessary, which is challenging. In the past few years, various fluorescence-based sensory materials have been developed to detect anions in the solution, solid, and vapor phases through various mechanisms. Significant undertakings are in progress to develop fluorescent materials with high sensitivity, selectivity, and fast response time. This review article starts with the various sensing mechanisms for fluorescence-based anion detection. Subsequently, the fluorescent sensory materials for anion detection are widely and efficiently summarized, focusing on the last 10 years of investigation. The focus of this review is to present a broad scope of fluorescent materials, for example, supramolecular systems, polymeric chemosensors, small molecules, metal–organic frameworks (MOFs), and aggregation-induced emissive materials, and their associated mechanisms and applications. Also, an outline of the reported fluorescent materials and their mechanism, anion detection, low detection limit (LOD), and applications are presented in a table format.

Effect of Bi3+ ions on physical, thermal, spectroscopic and optical properties of Nd3+ doped sodium diborate glasses

Abstract: Neodymium doped sodium diborate glasses containing bismuth oxide were prepared by melt quenching method. An effort has been made to understand whether the stiffness of tightly bound diborate groups affect upon the addition of heavy metal oxide. The increase in density and decrease in molar volume with increase of Bi 2 O 3 content indicates the opening of diborate glass structure to achieve better packing and bonding. The mixed bonding such as Bi–O–B may occur during glass formation leads to decrease in its glass transition temperature. The increase in oxygen packing density values also indicates the existence of tight packing of the oxide network. The optical properties are measured using UV–visible spectroscopy. The increase in refractive index is attributed to the increasing number of highly polarizing Bi 3+ ions with higher atomic weight and coordination number. The decrease in the optical band gap energy with increase in Bi 2 O 3 content is ascribed to shifting of absorption edge to a longer wavelength region. The IR spectra reveal that the glass network consists of tightly bound diborate and BiO 6 octahedral units.

Phase Engineering and Solitons of Bose–Einstein Condensates with Two- and Three-Body Interactions

Abstract: We introduce a phase imprint into the macroscopic order parameter governing the dynamics of Bose–Einstein condensates with attractive two-body interactions described by a cubic Gross–Pitaevskii (GP) equation and then engineer the imprinted phase suitably to generate the modified GP equation. The modified GP equation describes the dynamics of condensates with both two- (attractive) and three-body (attractive and repulsive) interactions in an expulsive harmonic trap. Employing gauge transformation approach, we then construct bright solitons of the modified GP equation. We observe that the attractive three-body interactions introduce an additional nontrivial phase in the matter wave solitons arising due to attractive two-body interactions without changing their density while the repulsive three-body interactions enormously increase the density of the condensates without causing any change in the phase of the solitons originating from attractive two-body interactions.