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Common Sense Emergency Response
Published in Robert A. Burke, Common Sense Emergency Response, 2020
Potassium sulfide. Potassium sulfide (K2S) is a binary salt. It is a red or yellow-red crystalline mass or fused solid. It is deliquescent in air, which means it absorbs water from the air, and is also soluble in water. Potassium sulfide is a dangerous fire risk and may ignite spontaneously. It is explosive in the form of dust and powder. It decomposes at 1,562°F and melts at 1,674°F. Its specific gravity is 1.74, which is heavier than air. The 4-digit identification number is 1382. The NFPA 704 designation is Health 3, Flammability 1, and Reactivity 0. Potassium sulfide is used primarily in analytical chemistry and medicine.
Applied Chemistry and Physics
Published in Robert A. Burke, Applied Chemistry and Physics, 2020
Potassium sulfide (K2S) is a binary salt. It is a red or yellow–red crystalline mass or fused solid. It is deliquescent in air, which means it absorbs water from the air, and it is also soluble in water. Potassium sulfide is a dangerous fire risk and may ignite spontaneously. It is explosive in the form of dust and powder. It decomposes at 1,562°F and melts at 1,674°F. The specific gravity is 1.74, which is heavier than air. The 4-digit identification number is 1382. The NFPA 704 designation is health—3, flammability—1 and reactivity—0. Potassium sulfide is used primarily in analytical chemistry and medicine.
The role of ligands in pressure-induced phase transition of gold nanoribbons
Published in Phase Transitions, 2021
Caihong Xing, Xingchen Liu, Li Xiao-Hong, Chang Song, Dongbo Cao, Xiaodong Wen
Nevertheless, ligands can not only stabilize nanomaterials; many studies have shown that they can lead to the phase transition of nanomaterials. Ding et al. [27] found that the excess oleic acid would induce the phase transformation of perovskite nanocrystals from cubic CsPbBr3 to tetragonal CsPb2Br5 gradually. Boles et al. [28] have shown that the exchange of oleic acid ligands with potassium sulfide resulted in a phase shift in polar solvents. Udayabhaskararao et al. [29] achieved the reversible transition from cubic CsPbX3 nanocrystals to rhombic Cs4PbX6 nanocrystals by controlling the ratio of oleylamine to oleic acid capping molecules. In addition to these studies, there are a lot of other literatures suggesting that ligands can cause phase transition in nanomaterials [30–33].
Contemporary Understanding and Developments in the Flotation Theory of Non-Ferrous Ores
Published in Mineral Processing and Extractive Metallurgy Review, 2019
V. A. Chanturiya, S. A. Kondratiev
Collector-free flotation in a weakly acidic range probably occurs due to the oxidation of alkali metal polysulfide to a mixture of sulfanes (hydrogen polysulfides) (H2S3, H2S4, H2S5, H2S≥6) and the formation of polysulfides of heavy non-ferrous metals by substitution of the hydrogen in the sulfanes with metal cations (Muller and Hyne 1968). To measure the surface-active properties of copper (I) polysulfides, powdered copper was added to a solution of potassium polysulfide obtained by mixing potassium sulfide with elemental sulfur at 6–7 (Nekrasov 1973). The filtrate of the resulting solution was examined for its surface-active properties.