The XRD analyses show that positive ion exchanges react between sodium-montmorillonite(Na~+-MMT) and organic ammonium salt. Then the spacing between the layers of Na~+-MMT was expanded to form organic montmorillonite(OMMT).
After adding composite inhibitors, γ-FeOOH content in the outer layer increased and organic ammonium incorporated in the film to certain depth, and silicate only deposited on the surface of the film.
The sample is dissolved quickly with hydrofluoric acid and complexed with saturated boric acid. pH of the solution is controlled by the buffer solutions of acetic acid-ammonium acetate and trinal organic ammonium salt is used as masking agents to determine iron in titanium alloy by spectrophotometry with 1,10-phenanthroline.
According to the cation-exchange mineral characters,rectorite was first sodium-ionized modified,and then inserting-layer modified by fluorocarbon surfactant and complex quaternary ammonium salt. Organic ammonium cation enters into the layers of rectorite and makes the interlayer spacing grow from 2.41nm to 4.75nm. The modified rectorite can be used as anti-setting agent and dispersant of water-borne epoxy coatings.
Precursor Co(OEt)_2(acac)_2 was prepared through directly electrolyzing in absolute ethanol and acetylacetone mixed solution in the presence of Bu_4NBr(as an electron-conductive additive).
The result indicates that PU/OMMT nano-coating is obviously better than PU on tensile strength and extensibility at break when the content of OMMT is less than3%. However,the content of-NCO in PU/OMMT waterproof nano-coating decreases remarkably when the content of OMMT is over3%,because of reaction of reactive hydrogen of OMMT with-NCO,which make the degree of crosslink insufficient and mechanical properties of PU/OMMT lower down.
An industrial activated charcoal and a clinoptilolite-rich tuff hydrofobized with an organic ammonium base were used as the related materials to compare phenol removal efficiency.
On the other hand, final molasses also contained some organic/ammonium nitrogen and refractory organic matter including colors, both of which were difficult to remove with the reactor.
The structure of several metatungstates, such as alkali metatungstates (K+, Na+), ammonium metatungstate and alkylammonium metatungstates (CZH5NH3+, (C2H5)2NH2+) prepared from white powdery tungstie acid, have been studied by means of PMR spectra. The Keggin structure of these metatungstates has been identified by determination of the number of non-exchangeable protons in their structure, and the values of chemical shift have been estimated. The effect of various structure upon the chemical shift of PMR has...
Ethylene diamine and ethanol amine react with white powdery tungstic acid to form metatungstates and paratungstates at weak acidic and neutral media respectively. Isopropyl amine forms metatungstate at pH 3-7 region. The compositions of these polytugstates are shown in table 1. UV, 1R, PMR and polarographic studies have all been performed for these compounds. It has been found that only the metatungstates of ethanol amine and isopropyl amine are photosensitive. On exposure to sunlight or ultraviolat ray, si...
Through ion exchange reaction together with the use of electron pair donor organic re-agents, active white powdery tungstic oxide hydrate (abbr. WPTA) can be separated intomutually convertible deca- and hexa-tungstates. A brief sketch of procedures is given inscheme 1. The success of the above mentioned method in getting deca- and hexa-tungstates pro-mptly led to our new method of preparing deca- and hexa-tungstates through oxidation oftungsten carbide with hydrogen peroxide. Many applications of WPTA, toge...
有机铵
organic ammonium
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