Russian Journal of Applied Chemistry最新文献_第10页

Synthesis and Properties of Vanadium Oxide Nanocoatings on the Surface of Polycrystalline α-Al2O3 多晶α-Al2O3 表面氧化钒纳米涂层的合成及其特性

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1134/S1070427223050099

N. V. Zakharova, V. E. Kusov, A. A. Malygin

{"title":"Synthesis and Properties of Vanadium Oxide Nanocoatings on the Surface of Polycrystalline α-Al2O3","authors":"N. V. Zakharova, V. E. Kusov, A. A. Malygin","doi":"10.1134/S1070427223050099","DOIUrl":"10.1134/S1070427223050099","url":null,"abstract":"Vanadium oxide nanocoatings of various thicknesses were synthesized by the atomic layer deposition (ALD) through cyclic alternating treatment of polycrystalline α-Al2O3 plates with vapors of vanadium(V) oxochloride and water. Diffuse reflectance spectroscopy, demonstrated that, depending on the number of treatment cycles, complexes of various structures are generated on the surface, containing distorted aluminovanadate structures, layers with tetrahedral vanadium coordination, and polyhedra, in which the vanadium atom environment coordinated with oxygen is similar to the state in crystalline V2O5. Based on the results of studies using an atomic force microscope, it was found that depending on the thickness of the growing layer, the surface morphology and the degree of its overlap change. After 600 cycles of treatment with vapors of vanadium(V) oxochloride and water, a coating is formed that completely covers the surface of the original substrate. A composition based on polycrystalline α-Al2O3 with a functional vanadium oxide layer exhibits sensor properties in relation to such components of the gas environment as NO2, CO, NH3, H2S, H2.","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"96 5","pages":"570 - 578"},"PeriodicalIF":0.6,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140116218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Separation of Gas Mixtures Containing Carbon Dioxide Using Membranes Based on Polytricyclononenes with Trialkoxysilyl Groups 使用基于带有三烷氧基硅基的聚三环壬烯的薄膜分离含二氧化碳的气体混合物

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1134/S1070427223050117

D. A. Alentiev, D. I. Petukhov, M. V. Bermeshev

引用次数: 0

Determination of Local Young’s Modulus Values on the Polymer Surface by Contact Force Spectroscopy 通过接触力谱测定聚合物表面的局部杨氏模量值

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1134/S1070427223050130

Yu. V. Kuznetsova, N. V. Verolainen, V. A. Verolainen, K. A. Shamarina

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Synthesis of New Bis(arylsulfanyl Diketones) as Promising Building Blocks with Fungicidal Activity 合成具有杀菌活性的新型双（芳基硫酰基二酮）构件

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1134/S1070427223050129

N. S. Akhmadiev, N. F. Galimzyanova, V. R. Akhmetova

引用次数: 0

Saturation Vapor Pressure of Water over Sodium Borohydride Dihydrate 水在二水硼氢化钠上的饱和蒸汽压

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1134/S1070427223050075

A. V. Shikhovtsev, O. V. Kravchenko, A. A. Vinokurov, M. V. Solov’ev, M. V. Tsvetkov, Yu. A. Dobrovol’skii

{"title":"Saturation Vapor Pressure of Water over Sodium Borohydride Dihydrate","authors":"A. V. Shikhovtsev, O. V. Kravchenko, A. A. Vinokurov, M. V. Solov’ev, M. V. Tsvetkov, Yu. A. Dobrovol’skii","doi":"10.1134/S1070427223050075","DOIUrl":"10.1134/S1070427223050075","url":null,"abstract":"The relative humidity and saturated water vapor pressure resulted from the reversible equilibrium dissociation of crystalline NaBH4·2H2O in the temperature range 0–36°C were determined. Based on the data obtained for NaBH4·2H2O, the equilibrium water vapor pressure as a function of temperature ln P = –6567.1T–1 + 23.863, enthalpy ∆Н0 = 54 ± 0.8 kJ mol–1 and entropy ∆S0 =198 ± 2 J mol–1 K–1 of NaBH4·2H2O dissociation into NaBH4 and H2O, standard enthalpy ∆H°= –783 kJ mol–1 and entropy ∆S° = 281 J mol–1 K–1 of formation of NaBH4·2H2O were calculated. An equation was derived for the humidity vs. temperature, which determines the regions of NaBH4·2H2O formation or its dissociation Rh = 0.334t + 17.5. It was shown that the pressure of saturated water vapor over a concentrated NaBH4 solution (30 wt %) at temperatures up to 45°C has higher values compared to NaBH4·2H2O samples synthesized by two different methods.","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"96 5","pages":"562 - 565"},"PeriodicalIF":0.6,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140116554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Features of Thermal Degradation of Chlorosulfonated Polyethylene 氯磺化聚乙烯的热降解特征

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1134/S1070427223050026

A. A. Seleznev, A. V. Navrotsky, S. A. Safronov, V. A. Navrotsky

引用次数: 0

Effect of Surface Modification of Carbon Fibers on the Formation of SiO2 Coatings 碳纤维表面改性对 SiO2 涂层形成的影响

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1134/S1070427223050142

R. F. Gallyamova, S. A. Grabovskiy, V. A. Dokichev, F. F Musin

{"title":"Effect of Surface Modification of Carbon Fibers on the Formation of SiO2 Coatings","authors":"R. F. Gallyamova, S. A. Grabovskiy, V. A. Dokichev, F. F Musin","doi":"10.1134/S1070427223050142","DOIUrl":"10.1134/S1070427223050142","url":null,"abstract":"Surface modification of carbon fiber with 1,1-dihydroperoxycyclohexane (DHPC) before application of SiO2 barrier coating was studied. IR spectroscopy showed presence of the COOH carboxyl groups on the surface of modified carbon fibers. The modified surface has less hydrophobicity due to the presence of polar groups, which contribute to a change in the wettability of the fiber by the sol–gel solution and the adhesion of the oxide coating to the fiber surface. The quality and thickness of the oxide coatings were assessed by scanning electron microscopy. The use of DHPC leads to oxidation of the carbon fiber, making surface longitudinal stripes deeper. To determine the effect of DHPC modification on the properties of the fiber surface, a SiO2 coating was applied by immersion in a tetraethoxysilane sol. DHPC modification leads to the formation of a uniform SiO2 coating on the fiber surface. After the heat treatment, the coating thickness on the DHPC–modified fibers is 130 ± 30 nm. Analysis of the IR spectra showed that the addition of DHPC to the sol leads to an increase in the intensity of the Si–O–Si, Si–OH, and OH absorption bands, which are characteristic of the hydrolysis and polycondensation products of tetraethoxysilane. In the wavenumber range of 400–1200 cm–1, the Si–O–Si fragments form, which is confirmed by the presence of bands of Si–O– deformation bond at ν = 881 and 442 cm–1. The introduction of DHPC into the sol promotes the formation of a uniform coating on the carbon fibers. The coating thickness on the initial fibers reaches 410±100 nm at room temperature, decreasing to 190±60 nm after heating. The fiber and sol modification contribute to formation of a uniform coating with a thickness of 200 ± 70 nm and 130 ± 30 nm before and after the heating, respectively. DHPC modification of the fiber surface and tetraethoxysilane sol promotes the formation of continuous, uniform, and quality SiO2 coatings on the surface of carbon fibers.","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":"96 5","pages":"607 - 613"},"PeriodicalIF":0.6,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140116220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Radical Copolymerization of p-Aminophenylcyclopropylmethyl Methacrylate with Methyl Methacrylate 对氨基苯环丙基甲基甲基丙烯酸酯与甲基丙烯酸甲酯的 Radical 共聚作用

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1134/S1070427223050038

K. G. Guliyev, V. E. Vahabova

引用次数: 0

Application of UV Spectroscopy to Study Structural Rearrangements in Cysteine–Silver Solution 应用紫外光谱研究半胱氨酸-银溶液中的结构重排

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1134/S1070427223050087

K. A. Shukhina, S. D. Khizhnyak, P. M. Pakhomov

引用次数: 0

Intermolecular Interactions of Cefotaxime with Sodium Alginate Biopolymer in Aqueous Solutions 水溶液中头孢他啶与海藻酸钠生物聚合物的分子间相互作用

IF 0.6 4区化学

Russian Journal of Applied Chemistry Pub Date : 2024-02-13 DOI: 10.1134/S1070427223040043

G. M. Mirgaleev, S. V. Shilova, V. P. Barabanov

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