نتایج جستجو برای: polysulfide polymer
تعداد نتایج: 93676 فیلتر نتایج به سال:
Bioassay-guided fractionation of the MeOH extract from a Philippine didemnid ascidian resulted in the isolation of two new dimeric alkaloids, lissoclinotoxins E (1) and F (2). The polysulfide structures for compounds 1 and 2 were determined by interpretation of spectroscopic data and chemical degradation. Computational chemistry studies suggested that the N-alkyl chains about the tricyclic syst...
The formation of pyrite (FeS2) from iron monosulfide precursors in anoxic sediments has been suggested to proceed via mackinawite (FeS) and greigite (Fe3S4). Despite decades of research, the mechanisms of pyrite formation are not sufficiently understood because solid and dissolved intermediates are oxygen-sensitive and poorly crystalline and therefore notoriously difficult to characterize and q...
Batch treatability studies for a Cr(VI)-contaminated glacial soil from a Cr plating facility were conducted using 1X and 2X the stoichiometric ratio of calcium polysulfide (CPS). The pH of the treated soil increased from 6 to 11 upon CPS addition, but progressively returned to 8-8.5 over the course of 1 year. The 1X dosage maintained a highly reducing environment up to 21 days of monitoring wit...
Low permeability zones (LPZs) are typically bypassed when remedial reagents injected into heterogeneous aquifers, which hinders the in situ remediation. Although shear-thinning polymers have emerged as promising tools to meet this challenge, their applicability complex systems remains unconfirmed. We investigated sweeping efficiencies of calcium polysulfide (CPS) Cr(VI)-contaminated LPZs using ...
The high theoretical specific capacity of lithium-sulfur (Li-S) batteries makes them a more promising energy storage system than conventional lithium-ion (LIBs). However, the slow kinetics electrochemical conversion reaction seriously hinders utilization Li-S as an active battery material and has prevented successful application cells. Therefore, exploration alternatives that can overcome slugg...
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