scholarly journals Study of Barium Iodide-Hexamethylentetramin-Water System

2021 ◽  
Vol 7 (12) ◽  
pp. 19-24
Author(s):  
D. Altybaeva ◽  
Zh. Abdullaeva ◽  
B. Atakulova ◽  
Zh. Dzumaeva ◽  
M. Mirzaeva

Research relevance in this article is based on study of heterogeneous equilibria in ternary aqueous systems BaI2 — (CH2)6N4 — H2O, as synthesized complexes can be used as an antibacterial drug in veterinary medicine. Materials and research methods: heterogeneous equilibria were studied by the isothermal solubility method at 25 °С. Concentration limits of compounds existence and their solubility types have been established. Research objectives: to determine chemical bond types between the complexing agent and the ligand, as well as the general laws of thermal decomposition of synthesized compounds. Research results: the solubility isotherm of the BaI2 — (CH2)6N4 — H2O system has been studied and compiled. Conclusions: effect of anions on complexation and composition of resulting compounds were revealed.

Author(s):  
Kanokwan Chaiyasing ◽  
Boonsom Liawruangrath ◽  
Surapol Natakankitkul ◽  
Sakchai Satienperakul ◽  
Narabhats Rannurags ◽  
...  

2009 ◽  
Vol 1157 ◽  
Author(s):  
Serdar Aksu

AbstractIn this paper, the electrochemical behavior of copper in aqueous solutions containing phosphoric acid (H3PO4) is investigated to elucidate the role of H3PO4 in the Cu ECMP slurries. Aqueous solubility and potential-pH diagrams were constructed for copper-phosphate-water system. Good correlations were found between the diagrams and the experimental polarization data. It was found that H3PO4 might not able to sufficiently increase the solubility of copper alone. A complexing agent is needed to ensure the high solubility of copper, especially as the slurry pH and dissolved copper concentration increase. Specific conductance measurements revealed that phosphoric acid was the key constituent responsible for increasing the conductivity of the ECMP electrolyte. In situ electrochemical polarization experiments showed that the planarization mechanism during the ECMP process was similar to that observed in conventional copper CMP.


Author(s):  
Д. О. Стороженко ◽  
Н. В. Бунякіна ◽  
О. Г. Дрючко ◽  
І. О. Іваницька ◽  
Н. М. Гринчишин

У роботі методом ізотермічної розчинності досліджено фазові рівноваги у водно-сольових системах хлоридів лужних металів і рідкісноземельних елементів (неодиму, гадолінію) при 25–100 °С. Установлено температурні та концентраційні межі кристалізації вихідних солей і подвійних сполук. Виявлені подвійні  хлориди синтезовані та ідентифіковані фізико-хімічними методами аналізу. We investigated phase equilibrium in aqueous systems chloride salt and alkali metal and rare earth elements (neodymium, gadolinium) at 25–100 °C by isothermal solubility in the article. Temperature and concentration limits of crystallization of initial salts and double compounds. We identified double chlorides which were synthesized and identified by physical and chemical methods of analysis.


2019 ◽  
Vol 47 (1) ◽  
Author(s):  
Nusret Apaydin Ebru Kemiksiz ◽  
Aytac Akcay

Background: Ethacridine lactate (Rivanol) has been used as an antibacterial drug in the treatment of infected wounds for many years. Although Manuka honey has been used in the treatment of burns, ulcers and infected wounds in human medicine for many years, its use in veterinary medicine is new.  Manuka honey has been found to provide rapid cicatrization and lower chronic pain levels, to prevent bad odor, and has antibacterial properties. The aim of this study was to compare the effects of Etacridine lactate and Manuka honey in the treatment of infected wounds in cats.Materials, Methods & Results:  In this study, 32 cats, with infected wounds in different areas on their body, were used. Cats were divided into two groups. The Rivanol group (n = 16) consisted of 6 female and 10 male cats aged 4 ± 3 years from different breeds and in several weights. Manuka group (n = 16) consisted of 7 male and 9 female cats of different breeds and weight and aged 4 ± 2 years. Rivanol was applied to the first group and Manuka honey (Manuka Nd, G) was applied to the second group. First measurements were recorded after the surgical debridement of the wound area. Four measurements were made every 3 days. The size (length - width) of the wounds was measured and recorded. Parenteral Marbofloxacin was administered orally in all cases. In order to prevent the contact of the cases with the dressing, the collar was worn. In the Rivanol group, when the first measurement values (length: 4.29 ± 2.78 cm, width: 2.13 ± 0.58 cm) and the 4th measurement values (length: 2.21 ± 1.37 cm, width: 1.06 ± 0.41 cm) were compared, there was a decrease in the wound size. In the Manuka group, when the first measurement values (length 2.84 ± 1.51 cm, width: 2.01 ± 1.03cm) and the 4th measurement values (length: 1.42 ± 1.10 cm, width: 0.90 ± 0.72cm) were compared, the wound sizes were diminished as in the Rivanol group. In all measurement days, the differences between of Rivanol and Manuka groups concerning the width, length and wound sizes were not statistically significant (P > 0.05). Wound size, length and width showed a linear decrease over the measurement days. These decreases were similar in Rivanol and Manuka group. There was no statistically significant difference between Rivanol (12.44 ± 3.74 days) and Manuka (12.44 ± 4.68 days) groups over the cicatrization period (P > 0.05).Discussion: Rivanol and Manuka honey were effective in wound healing. Although there were no differences between the two groups, the wound sizes decreased in each measurement of the wounds. A moist environment was formed on the wound, debrideman accelerated and granulation tissue formation was encouraged with the application of both topical agents. Therefore, it was considered that wound healing in our cases was successful. It has been found that honey is frequently applied in wound treatment and in many areas in human medicine. However, in the field of veterinary medicine, there were few investigations. In the treatment of infected wounds of cats, it was determined that the application of Rivanol and Manuka honey yielded similar results in terms of time and there was no statistically significant difference. Manuka honey was found to be an alternative to Rivanol in the treatment of infected cat wounds. Manuka honey preparations (pad or pomade) were preferred because of the ease of use. In order to determine the efficacy of manuka honey in wound healing, it was thought that many further clinical or experimental studies should be carried out using microbiological, biochemical and histopathological parameters.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Piotr Krawiec ◽  
Łukasz Warguła ◽  
Dorota Czarnecka-Komorowska ◽  
Paweł Janik ◽  
Anna Dziechciarz ◽  
...  

AbstractMachines and devices for the production, transport and segregation of products are placed in production and storage rooms. Flat conveyor and drive belts are very often used for their construction. Due to heavy loads and difficult operating conditions, these belts can catch fire and, as a result, become the main source of air contaminants harmful to human health and life. This article examines the emission level of toxic chemical compounds most often produced during the thermal decomposition and combustion of flat drive and conveyor belts. Six types of flat belts, which were made of various polymer materials, i.e., polyamide, rubber, and polyurethane, and were pyrolyzed in a tube furnace at 950 °C, were tested for emission. Using an Fourier transform infrared spectroscopy gas analyser, five gaseous products of combustion were identified, i.e., carbon mono oxide, carbon dioxide, hydrogen cyanide, hydrogen bromide and sulfur dioxide (SO2). Chemical analysis showed that SO2 compounds and hydrogen bromide were present in only two samples. The test results indicate that gas emission concentration limits for all the tested belts were significantly exceeded. A comparative analysis of the concentration limits of V-belts described in the authors' earlier works shows that flat belts demonstrate lower emission levels of harmful compounds than V-belts. In addition, research has shown that compared to traditional rubber-based belts, belts made of modern materials exhibit no emission of hydrogen chloride compounds during thermal decomposition and combustion.


Author(s):  
William J. Baxter

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.


Author(s):  
A. Legrouri

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.


Author(s):  
P. L. Burnett ◽  
W. R. Mitchell ◽  
C. L. Houck

Natural Brucite (Mg(OH)2) decomposes on heating to form magnesium oxide (MgO) having its cubic ﹛110﹜ and ﹛111﹜ planes respectively parallel to the prism and basal planes of the hexagonal brucite lattice. Although the crystal-lographic relation between the parent brucite crystal and the resulting mag-nesium oxide crystallites is well known, the exact mechanism by which the reaction proceeds is still a matter of controversy. Goodman described the decomposition as an initial shrinkage in the brucite basal plane allowing magnesium ions to shift their original sites to the required magnesium oxide positions followed by a collapse of the planes along the original <0001> direction of the brucite crystal. He noted that the (110) diffraction spots of brucite immediately shifted to the positions required for the (220) reflections of magnesium oxide. Gordon observed separate diffraction spots for the (110) brucite and (220) magnesium oxide planes. The positions of the (110) and (100) brucite never changed but only diminished in intensity while the (220) planes of magnesium shifted from a value larger than the listed ASTM d spacing to the predicted value as the decomposition progressed.


Author(s):  
M.D. Bentzon ◽  
J. v. Wonterghem ◽  
A. Thölén

We report on the oxidation of a magnetic fluid. The oxidation results in magnetic super lattice crystals. The “atoms” are hematite (α-Fe2O3) particles with a diameter ø = 6.9 nm and they are covered with a 1-2 nm thick layer of surfactant molecules.Magnetic fluids are homogeneous suspensions of small magnetic particles in a carrier liquid. To prevent agglomeration, the particles are coated with surfactant molecules. The magnetic fluid studied in this work was produced by thermal decomposition of Fe(CO)5 in Declin (carrier liquid) in the presence of oleic acid (surfactant). The magnetic particles consist of an amorphous iron-carbon alloy. For TEM investigation a droplet of the fluid was added to benzine and a carbon film on a copper net was immersed. When exposed to air the sample starts burning. The oxidation and electron irradiation transform the magnetic particles into hematite (α-Fe2O3) particles with a median diameter ø = 6.9 nm.


1992 ◽  
Vol 64 (19) ◽  
pp. 931A-940A ◽  
Author(s):  
Totaro Imasaka ◽  
Masami Hozumi ◽  
Nobuhiko Ishibashi

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