Formation of size-tunable CdS rhombic dodecahedra

2021 ◽  
Author(s):  
Chien-Hsuan Hsiao ◽  
Chun-Wei Chen ◽  
Hsiang-Sheng Chen ◽  
Pei-Lun Hsieh ◽  
Yi-An Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Cadmium Acetate ◽  
Rhombic Dodecahedra

By preparing an aqueous solution of cadmium acetate, thioacetamide (TAA), and nitric acid at 23 to 29 ºC, then heating the solution to 110 ºC for 40 min, unprecedented {110}-bound...

DETERMINATION OF TRACE AMOUNTS OF SILVER IN GALENA ORES

1960 ◽  
Vol 38 (9) ◽  
pp. 1488-1494 ◽  
Author(s):  
E. J. Bounsall ◽  
W. A. E. McBryde
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Sodium Chloride ◽  
Hydrochloric Acid ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Silver Content ◽  
Aqueous Sodium Chloride Solution ◽  
Aqueous Sodium

An analytical method is described for the determination of microgram amounts of silver in galena ores, based on the "reversion" of silver dithizonate. Silver is separated from relatively large amounts of lead by extraction as dithizonate into chloroform from an aqueous 1:99 nitric acid solution. Separation from mercury, which is also extracted under these conditions and would, if present, interfere in the analysis, is achieved by reverting the dithizonate solution with a 5% aqueous sodium chloride solution which is also 0.015 molar in hydrochloric acid. Following dilution of this aqueous solution and adjustment of pH, silver is again extracted into chloroform as the dithizonate, and determined absorptiometrically. Analyses of a number of galena ore samples showed a precision of within 3% for a silver content ranging from 0.03 to 0.4%.Some other methods for isolating silver from these samples, which were tried but found unsatisfactory, are discussed.

Synthesis and Characterization of CdSe Nanoparticles with Cadmium Precursor Variation in Colloidal Synthesis

2014 ◽  
Vol 976 ◽  
pp. 52-58 ◽  
Author(s):  
Janeth Sarmiento Arellano ◽  
Enrique Rosendo ◽  
Román Romano ◽  
Gabriela Nieto ◽  
Tomás Díaz ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ph Value ◽  
Sodium Tripolyphosphate ◽  
Compositional Analysis ◽  
Cadmium Acetate ◽  
Cdse Nanoparticles ◽  
Molar Concentration ◽  
Colloidal Synthesis ◽  
Cadmium Nitrate ◽  
X Ray

A comparative study of the synthesis of cadmium selenide (CdSe) nanoparticles (NPs) using different cadmium precursors such as, cadmium nitrate (Cd (NO3)2·4H2O), cadmium acetate ((CH3COO)2Cd·2H2O) and cadmium chloride (CdCl2·2.5H2O) is presented in this work. The method used to obtain the CdSe NPs was the colloidal synthesis at low temperature and atmospheric pressure. The Cd2+ ions were obtained in aqueous solution at room temperature, the surfactant used in the process was an aqueous solution of sodium hydroxide (NaOH), penta-sodium tripolyphosphate and H2O named commonly extran, which not only helps to stabilize the NPs, but also allows adjusting the pH of the solution. Se2- ions were obtained with sodium borohydride (NaBH4) as reductant at 75 oC. The by-products from the reaction were eliminated through a cleaning process with hydrochloric acid (HCl). Molar concentration of Cd:Se was varied from 3:1 to 1:3 and the pH value was varied between 8 and 11. The obtained samples were characterized by X-ray diffraction (XRD), it was seen that the obtained NPs present cubic centered face structure. The crystallite size from the powder was calculated using the Debye-Scherrer equation and was found between 3.3 nm and 5.6 nm, the variation in size depends on the molar concentration of cadmium and selenium. Morphological study was done using scanning electron microscopy (SEM) and compositional analysis was done by energy dispersive x-ray analysis (EDAX).

Thermodynamic quantities for the ionization of nitric acid in aqueous solution from 250 to 319�C

1992 ◽  
Vol 21 (8) ◽  
pp. 789-801 ◽  
Author(s):  
J. L. Oscarson ◽  
S. E. Gillespie ◽  
R. M. Izatt ◽  
X. Chen ◽  
C. Pando
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Thermodynamic Quantities

4,4′,4′′-(1,3,5-Triazine-2,4,6-triyl)tripyridinium trinitrate

2007 ◽  
Vol 63 (3) ◽  
pp. o1344-o1346 ◽  
Author(s):  
Shou-Rong Zhu ◽  
Wan-Dong Chen ◽  
Hong-Jian Zhao ◽  
Min Shao ◽  
Ming-Xing Li
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Title Compound ◽  
Aromatic Rings ◽  
Torsion Angles ◽  
Compound C

Reaction of 2,4,6-tris(4-pyridyl)-1,3,5-triazine (tpt) with excess nitric acid in an aqueous solution affords the title compound, C18H15N6 3+·3NO3 −. The torsion angles between adjacent aromatic rings are much larger than those of neutral tpt. All three pyridine N atoms are protonated.

scholarly journals IV. Researches on the hydrocarbons of the series C n H 2 n +2 .—No. V

1868 ◽  
Vol 16 ◽  
pp. 372-376
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Succinic Acid ◽  
Cold Water ◽  
Steam Bath ◽  
Oxidation Products ◽  
Saturated Hydrocarbons ◽  
Constant Weight ◽  
Cold Ether ◽  
Fuming Nitric Acid

Oxidation Products . In a former communication I have shortly described the action of different oxidizing agents upon some of the saturated hydrocarbons; the following paper contains some further results which I have since then obtained. One of the most striking properties of these compounds is, that they are with the greatest difficulty acted upon by any oxidizing substance in the cold. On heating them, however, a reaction sets in, and either they are completely burnt up to carbonic dioxide and water, or other oxidation products besides those two are formed in comparatively small quantities; thus chromic acid produces some acetic acid. Fuming nitric acid, which in the cold shows no action whatever, even if left in contact with one of these hydrocarbons for months, acts rather violently on gently heating; acid of the specific gravity 1.4 acts in a similar way, and produces the same products, but the reaction is much less violent. The apparatus which I used consisted of a glass flask of about one litre capacity, the narrow neck of which was several feet in length, and surrounded by a wider tube through which cold water flowed. The hydrocarbons treated in this way were hexylhydride and octylhydride (from petroleum), and diamyl. They were heated with the acid as long as red fumes were evolved; the liquid left in the flask was then distilled in a retort, until the unaltered hydrocarbon together with the greater part of the diluted nitric acid had passed over. The syrupy residue was heated in a steam-bath as long as nitric acid vapours escaped. A thick syrupy mass was left, from which, on cooling, a crystallized acid was deposited; on adding water these crystals dissolved, whilst a thick yellowish oil separated. This oil is insoluble in water, but somewhat soluble in the aqueous solution of the crystalline acid, which therefore cannot be obtained quite free from the oily substance by recrystallization only; but this may be effected by washing the crystals with cold ether, which dissolves very little of them, whilst the oil itself is very soluble. The acid obtained from octylhydride and that from diamyl melted at 180° C., and showed all the characteristic reactions of succinic acid; that from hexylhydride, from which I obtained only a very small quantity, could not be completely freed from the yellow oil, and therefore did not show a definite melting-point; it began to fuse at about 120°, and became perfectly liquid at 150°; it exhibited, however, all the reactions of succinic acid; and the following analyses, although they do not agree very well, yet show that it was this compound. From the acids the calcium and the silver-salt were prepared by neutralizing the aqueous solution with calcium carbonate and concentrating the filtered solution by boiling, when the salt separated in microscopic needles. Calcium succinate obtained in this way has the formula C 4 H 4 CaO 4 + H 2 O; the quantities of water and calcium found agree with this composition. The water was determined by drying the salt at 180° C., and the calcium by heating the dried salt over the blowpipe until the residue had a constant weight.

Nitrous acid generation from radiolysis of nitric acid aqueous solution under gas flow condition

2016 ◽  
Vol 54 (2) ◽  
pp. 182-187
Author(s):  
Daisuke Watanabe ◽  
Yoichi Wada ◽  
Akira Sasahira ◽  
Masashi Itori ◽  
Tetsunari Ebina
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Flow Condition ◽  
Nitrous Acid ◽  
Gas Flow ◽  
Acid Generation ◽  
Acid Aqueous Solution
Sign in / Sign up

Export Citation Format

Share Document