نتایج جستجو برای: alkali metal cation

تعداد نتایج: 260304  

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2001
N Uehara H Honzawa T Shimizu

Diazacrown ethers having two carbodithioate groups were synthesized, and their spectrophotometric properties were studied. Diammonium 1,4,10,13-tetraoxa-7,16-diazacycrooctadecane-N,N'-bis(carbodithioate) (DA18CC) and ammonium 1,4,10-trioxa-7,13-diazacycropentadecane-N,N'-bis(carbodithioate) (DA15CC) reacted with most heavy-metal ions through their two carbodithioate groups, and also reacted wit...

Journal: :Bioresource technology 2012
Jiang Long Hu Song Xiang Jun Su Sheng Sun Lun-Shi Xu Kai Yao Yao

Investigating the release characteristics of alkali and alkaline earth metallic species (AAEMs) is of potential interest because of AAEM's possible useful service as catalysts in biomass thermal conversion. In this study, three kinds of typical Chinese biomass were selected to pyrolyse and their chars were subsequently steam gasified in a designed quartz fixed-bed reactor to investigate the rel...

2017
Li Qingfeng Flemming Borup Irina Petrushina Niels J. Bjerrum

Journal: :Physical review letters 2008
M Sharma E Babcock K H Andersen L Barrón-Palos M Becker S Boag W C Chen T E Chupp A Danagoulian T R Gentile A Klein S Penttila A Petoukhov T Soldner E R Tardiff T G Walker W S Wilburn

We have observed depolarization effects when high intensity cold neutron beams are incident on alkali-metal spin-exchange-polarized 3He cells used as neutron spin filters. This was first observed as a reduction of the maximum attainable 3He polarization and was attributed to a decrease of alkali-metal polarization, which led us to directly measure alkali-metal polarization and spin relaxation o...

Journal: :journal of physical & theoretical chemistry 2011
m. sayadian l. pishkar f. mollaamin

calixarenes are a readily available and important class of macrocycles in supramolecularchemistry. calixarenes have generated considerable interest due to their basket shaped structureand as useful building blocks to synthesize selective receptors for the guest species, notably alkali,alkaline earth, lanthanide and transition metal cations. in this work studied on the complexingproperties of a ...

1998
S. R. Barman P. Häberle

Collective surface excitations in alkali-metal overlayers are observed using photoyield spectroscopy. Spectra for Na and K on Al~111! reveal a multipole surface plasmon and bulklike overlayer plasmon. In contrast, Li on Al exhibits only the multipole mode. In the submonolayer regime, all three alkali metals provide evidence for the threshold excitation. Time-dependent density-functional calcula...

Journal: :The Journal of General Physiology 1994
F Franciolini W Nonner

Background Cl channels in neurons and skeletal muscle are significantly permeable for alkali cations when tested with asymmetrical concentrations of the same salt. Both anion and cation permeation were proposed to require binding of an alkali cation with the pore (Franciolini, F., and W. Nonner. 1987. Journal of General Physiology. 90:453-478). We tested this hypothesis by bilaterally substitut...

Journal: :Chemical science 2017
Xiuquan Zhou Christopher Eckberg Brandon Wilfong Sz-Chian Liou Hector K Vivanco Johnpierre Paglione Efrain E Rodriguez

Inspired by naturally occurring sulfide minerals, we present a new family of iron-based superconductors. A metastable form of FeS known as the mineral mackinawite forms two-dimensional sheets that can be readily intercalated by various cationic guest species. Under hydrothermal conditions using alkali metal hydroxides, we prepare three different cation and metal hydroxide-intercalated FeS phase...

2016
Om Prakash Gupta

In the present study we have synthesized new trinuclear complexes of alkali metal salts with interaction of stable metal chelates of violuric Acid of Ni(II) & Cu(II) having general formula [Ma(H2Va)2.(MbL)2] and [Ma(H2Va)2.(MbX)2] where Ma=Ni (II) or Cu(II) and Mb =Li + , Na & K , H2Va= deprotonated Violuric Acid , L=deprotonated 1-nitroso-2-naphthol or 8-hydroxyquinoline and, X= ClO-4 or SCN ....

2017
Xiuquan Zhou Christopher Eckberg Brandon Wilfong Sz-Chian Liou Hector K. Vivanco Johnpierre Paglione Efrain E. Rodriguez

Inspired by naturally occurring sulfide minerals, we present a new family of iron-based superconductors. A metastable form of FeS known as the mineral mackinawite forms two-dimensional sheets that can be readily intercalated by various cationic guest species. Under hydrothermal conditions using alkali metal hydroxides, we prepare three different cation and metal hydroxide-intercalated FeS phase...

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