Effect of the composition of the immobilized copper-containing ionic liquid on the dodecyl mercaptan oxidation kinetics

Basic kinetic parameters of the catalytic oxidation of dodecyl mercaptan in kerosene in the presence of silica-immobilized pyridinium or imidazolium chlorocuprate complexes have been determined. The composition of the copper-containing anions and the oxidation kinetics depend on the nature of the ionic liquid and on the method of its synthesis. The compositions developed in this study are usable in the removal of hydrogen sulfide and light mercaptans from the oil stripping gas.     

Synthesis of Copper Nanoparticles by Thermal Decomposition of Anhydrous Copper Formate

Highly dispersed anhydrous copper formate obtained by cryochemical synthesis is subjected to thermal decomposition in an atmosphere of hydrogen. X-ray diffraction, PAM, UV-spectroscopy, and lowtemperature adsorption of argon show that the obtained powder contains only copper nanoparticles with a size of 50–200 nm.     

Cryochemical Modification of Medicinal Substances: The Effect of the Carrier Gas Flow Rate on the Physicochemical Properties of Nanoforms of the Antibacterial Drug Dioxidine

Moscow University Chemistry Bulletin - A combined cryochemical method is proposed for the dimensional and structural modification of drugs. This method forms a molecular flow of a substance...     

Cryochemical modification of drugs: Nanosized form III piroxicam and its physical and chemical properties

Dynamic sublimation in a stream of heated carrier gas and low-temperature condensation are used to perform structural and dimensional modification of nonsteroidal anti-inflammatory preparation of 4-hydroxy-2-methyl-N-(2-pyridinyl)-2Н-1,2-benzothiazin-3-carboxamide 1,1-dioxide (piroxicam) and to obtain its nanoscale form. Thus obtained samples correspond to the known thermodynamically metastable Form III of the compound. The average particle size of the preparation is d _av = 300 ± 30 nm. The resulting nanosized form of piroxicam is relatively stable with respect to structural and dimensional transformations for at least four years.     

Cryochemical modification,activity, and toxicity of dioxidine

Dioxidine nanoparticles are prepared via cryochemical modification of the pharmacopoeial dioxidine substance. The form of the cryomodified dioxidine is characterized by data from ¹H NMR spectroscopy; X-ray diffraction analysis; such thermal analytical methods as TG and DSC; low-temperature argon adsorption; and transmission electron microscopy. It is shown that the cryomodified samples are synthesized in the form of dioxidine nanocrystals 50–300 nm in size, with a crystal structure differing from that of the initial pharmacopoeial substance. The prepared cryomodified dioxidine nanoparticles inhibit the growth of E. coli 52, S. aureus 144, M. cyaneum 98, and B. cereus 9 better than the initial pharmacopoeial substance, and have comparable chronic toxicity.     

Cryochemical Synthesis of Magnetite Nanoparticles

Magnetite nanoparticles 2–20 nm in size, forming agglomerates up to 70 nm in size, are obtained by cryochemical synthesis.     

Synthesis and Biological Activity of Hybrid Systems of Magnetic Nanoparticles with Antibacterial Drugs

Moscow University Chemistry Bulletin - Abstract—Nanoparticles of iron and magnetite, which have a high potential with respect to their magnetic properties, as well as antibacterial and...     

Effect of the Conditions the Reaction on the Formation of Iron Nanoparticles during the Reduction of Iron(III) Ions with Sodium Borohydride

Abstract—Iron nanoparticles are obtained by reducing iron(III) chloride with sodium borohydride in aqueous solutions at room temperature without using stabilizing agents. The obtained samples are characterized by X-ray diffraction analysis, low-temperature adsorption of argon, and transmission electron microscopy. The effect of the concentration of reagent solutions, the molar ratio of reagents, and exposure to ultrasound and inert atmosphere (Ar) on the size and composition of the resulting particles is found. Depending on the conditions of borohydride reduction of iron salts in an aqueous solution, both agglomerates of iron nanoparticles (5–50 nm) of 200 nm or larger and individual iron nanoparticles of 1 to 20 nm in size can be obtained. The presence and concentration of wustite and magnetite in the composition of the obtained particles mainly depend on the concentration of the reducing agent.     

Cryochemical synthesis and antibacterial activity of hybrid nanocomposites based on dioxidine containing Ag and Cu nanoparticles incorporated in biopolymer cryostructurates

Russian Chemical Bulletin - Cryochemical synthesis of hybrid nanocomposites based on the antibacterial drug, dioxidine, and metals (Ag, Cu) was performed. According to the data of H1 NMR, UV, and...     

Low-Temperature Synthesis and Antibacterial Activity of Hybrid Systems of Gentamicin Sulfate with Copper and Iron Nanoparticles

Moscow University Chemistry Bulletin - Cryochemical modification methods are used to obtain hybrid composites of the antibacterial drug gentamicin sulfate, as well as copper and iron nanoparticles,...