Results 281 to 290 of about 1,249,363 (328)

Scattering of Cold Neutrons in Ammonium Carbonate, Ammonium Citrate, and Ammonium Acetate

The Journal of Chemical Physics, 1967
Neutron-energy-gain spectra have been measured in (NH4)2CO3, (NH4)2HC6H5O7, and NH4C2H3O2 at 20°C using the Brookhaven slow-chopper facility. Each spectrum exhibits two peaks that are characteristic of optical modes. The spectra of ammonium carbonate and ammonium citrate are similar to those of the body-centered-cubic lattice phase of the ammonium ...
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Nitrogen-doped, carbon-rich, highly photoluminescent carbon dots from ammonium citrate.

Nanoscale, 2014
The synthesis of water-soluble nitrogen-doped carbon dots has received great attention, due to their wide applications in oxygen reduction reaction, cell imaging, sensors, and drug delivery.
Zhi Yang, Minghan Xu, Yun Liu, F. He, Feng Gao, Yanjie Su, Hao Wei, Yafei Zhang   +7 more
semanticscholar   +1 more source

Cobalt Metallopeptide Electrocatalyst for the Selective Reduction of Nitrite to Ammonium.

Journal of the American Chemical Society, 2018
A cobalt-tripeptide complex (CoGGH) is developed as an electrocatalyst for the selective six-electron, eight-proton reduction of nitrite to ammonium in aqueous buffer near neutral pH. The onset potential for nitrite reduction occurs at -0.65 V vs Ag/AgCl
Yixing Guo, Jesse R. Stroka, Banu Kandemir, C. Dickerson, K. Bren   +4 more
semanticscholar   +1 more source

Ammonium

2009
Publisher Summary This chapter provides information on abbreviation, molecular formula, molar mass, structure, and applications of different compounds of ammonium. One of its compounds is tetramethylammonium bis((trifluoromethyl) sulfonyl)imide with abbreviation, [N1111][TFSI], and molar mass, 354.29.
Suojiang Zhang, Xiangping Zhang, Xiaohua Li, Xingmei Lu, Qing Zhou, Shucai Li   +5 more
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Thermal expansion of ammonium pertechnetate and ammonium perrhenate

Journal of Solid State Chemistry, 2019
Abstract The thermal expansion of NH4TcO4 and NH4ReO4 between 97 and 500 K has been established using variable temperature synchrotron X-ray diffraction. Both oxides display a tetragonal scheelite-type structure over the temperature range. The observed anomalous thermal expansion is associated with disorder in the orientation of the NH4 groups and ...
Brendan J. Kennedy, Michelle Yu, Helen E. A. Brand, Emily Reynolds, Emily Reynolds, Gordon J. Thorogood, Frederic Poineau   +6 more
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Ammonium peroxogermanate and ammonium peroxotellurates structure

Ammonium peroxogermanate [(NH₄)₆[Ge₆(μ-OO)₆(μ-O)₆(OH)₆]·6H₂O] and ammonium peroxotellurate are modern as rare chemical compounds chemistry and materials in engineering wide is used . Due to their complex structures, high stability and versatility, these compounds are important in catalysis, semiconductors and other technological fields.
Sodikova, Manzura, Ataullayev, Zokir
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Sources and fate of high levels of ammonium in surface water and shallow groundwater of the Jianghan Plain, Central China.

Environmental Science: Processes & Impacts, 2017
High levels of ammonium from anthropogenic sources threaten the quality of surface waters and groundwaters in some areas worldwide, but elevated ammonium levels of natural sources also have been identified.
Yao Du, T. Ma, Yamin Deng, Shuai Shen, Z. Lu   +4 more
semanticscholar   +1 more source

Energetics of ammonium cyanide and of some ammonium halides

Transactions of the Faraday Society, 1970
An analysis of the energetics of the structure of ammonium cyanide has permitted a more detailed description of this substance than has been given hitherto. The crystal energies of ammonium chloride and ammonium bromide have been revised during the calculations, and a more precise value for the enthalpy of formation of the gaseous ammonium ion has been
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On the thermal conductivity of ammonium- and deutero-ammonium chloride

Physics Letters A, 1969
Abstract Measurements of the thermal conductivity of NH 4 - and ND 4 Cl for the temperature range 2°–300°K are presented. There is a first order phase transition in NH 4 - and probably a second order transition in ND 4 Cl.
W. Waidelich, W. Bausch
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A simple and precise method for measuring ammonium in marine and freshwater ecosystems

, 1999
The accurate measurement of ammonium concentrations is fundamental to understanding nitrogen biogeochemistry in aquatic ecosystems. Unfortunately, the commonly used indophenol blue method often yields inconsistent results, particularly when ammonium ...
R. Holmes, A. Aminot, R. Kérouel, B. Hooker, B. Peterson   +4 more
semanticscholar   +1 more source