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28 results on '"Sarkar, Krishanu"'

2. Modern Approaches in Chemical and Biological Sciences

Author

Sarkar, Aabhra, additional, Sarbajna, Adity, additional, Mitra, Amrit Krishna, additional, Sarkar, Chhandasi GuhaRoy, additional, Ghosh, Harisadhan, additional, Sarkar, Krishanu, additional, Tamang, Suman, additional, Datta, Sutapa, additional, Golder, Tarikul Islam, additional, Ansar, Waliza, additional, and Pandey, Siddharth, additional

Published
2020
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13. A SHORT REVIEW ON THE RECENT ADVANCEMENT OF FLUORESCENT PROBES FOR FORMALDEHYDE SENSING 2017 ONWARD.

Author

Sarkar, Krishanu

Subjects
*FORMALDEHYDE, *FLUORESCENT probes, *NUCLEOPHILES, *ELECTROPHILES, *FLUORESCENCE
Abstract

Formaldehyde is not only a ubiquitous chemical pollutant in indoor environments but also a reactive carbonyl species in biological processes. Formaldehyde is endogenously produced through the essential biological processes, including mitochondrial one-carbon metabolism, metabolite oxidation, and nuclear epigenetic modifications. High electrophilic property allows it high reactivity with a wide variety of biological nucleophiles, which can be beneficial or detrimental to cellular function depending on the situation. Therefore, it is important to develop non-invasive sensing technique for monitoring the roles and functions of FA in biological processes. So, development of a rapid, sensitive and facile method to determine the concentration of FA becomes highly desirable. Fluorescence detection technique is highly attractive because of its high selectivity, sensitivity and real-time approach. This review article focuses on various design strategies of the fluorescent probes, their sensing mechanism for detecting formaldehyde in environment as well as in living cells based on different recognition groups from 2017 onward. This area still in prime focus because of the rapid development of the fluorescence probes from lab to indoor in near future. [ABSTRACT FROM AUTHOR]

Published
2020

28. 3D-Hexagonal Mesoporous Silica Having Exceptional H2Adsorption Capacity

Author

Nandi, Mahasweta, Sarkar, Mohona, Sarkar, Krishanu, and Bhaumik, Asim

Abstract

Highly ordered 3D-hexagonal mesoporous silica HMS-3 has been synthesized under alkaline condition at 277 K using tetraethyl orthosilicate as the silica source and cetyltrimethylammonium bromide as the structure-directing agent. Powder X-ray diffraction and HR TEM results revealed a 3D-hexagonal pore structure for this HMS-3 mesophase. Electron microscopy image analysis further suggested a uniform spherically packed nanoparticle morphology having a dimension of 200−300 nm for this mesoporous material. Nitrogen adsorption results showed a type IV isotherm with well-defined mesopores of ca. 2.2 nm dimension having very high surface area (1353 m2g−1) and moderately good pore volume (0.63 cc g−1). A very high cross-linking framework has been revealed from the high concentration of Q4species as seen from 29Si MAS NMR. This material showed considerably high H2adsorption capacity at 77 K under 1 bar atmospheric pressure vis-à-vis related pure silica MCM-41 (ca. 38% enhancement). At a pressure of 40 bar, the amount of H2adsorbed was ca. 2.0 wt %, which is comparable to good H2storage materials known in the literature. 3D-hexagonal pore openings with interconnected cagelike mesopores, very high surface area, and spherically packed nanoparticle morphology could be responsible for very high H2adsorption capacity of HMS-3 over other related mesoporous silica based materials.

Published
2009
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