Chimica Techno Acta最新文献_第7页

Advancements in N-heterocyclic carbenes (NHCs) catalysis for benzoin reactions: A comprehensive review from past to present N-杂环卡宾（NHCs）催化安息香反应的研究进展

Chimica Techno Acta Pub Date : 2023-07-04 DOI: 10.15826/chimtech.2023.10.2.14

P. Noppawan, Baramee Phungpis, Kanokkan Worawut

引用次数: 0

Mechanochemical recrystallization: Forgotten basics and new possibilities 机械化学再结晶:被遗忘的基础和新的可能性

Chimica Techno Acta Pub Date : 2023-06-02 DOI: 10.15826/chimtech.2023.10.2.13

F. Urakaev, N. Khan, A. Niyazbayeva, Dinar N. Zharlykasimova, M. Burkitbayev

{"title":"Mechanochemical recrystallization: Forgotten basics and new possibilities","authors":"F. Urakaev, N. Khan, A. Niyazbayeva, Dinar N. Zharlykasimova, M. Burkitbayev","doi":"10.15826/chimtech.2023.10.2.13","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.2.13","url":null,"abstract":"The task of this article is to update, develop and introduce into scientific practice the method of \"mechanochemical recrystallization\" in solid-phase systems with small additives of the liquid phase of the solvent and solid-phase precursors to stabilize the formed nanoparticles. The essence of this method is shown using the example of mechanical activation of the S–AgNO3–NH4X system, where X = Cl, Br, I, with the addition of dimethyl sulfoxide (DMSO), and the resulting mechanochemical synthesis of sulfur-containing nanocomposites S/AgX with the controlled content of sulfur nanoparticles (nanosulfur). The predetermined content of nanosulfur in nanocomposites is ensured by a continuous process of dissolution-crystallization (recrystallization) of starting sulfur in the DMSO medium in a mechanochemical reactor. The proposed technical solution made it possible to obtain S/AgX nanocomposites by a single mechanical treatment of powder precursors – AgNO3, NH4Х, NH4NO3 (diluent), commercial sulfur and DMSO in planetary ball mills with various milling tools. The method also includes washing the water-soluble components of mechanosynthesis.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44158999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of protective oxide layers formed by high-frequency plasma electrolytic oxidation on Mg-RE alloy with LPSO-phase LPSO相Mg-RE合金高频等离子体电解氧化保护层的改进

Chimica Techno Acta Pub Date : 2023-05-29 DOI: 10.15826/chimtech.2023.10.2.12

A. O. Cheretaeva, P. Glukhov, M. R. Shafeev, Alyona G. Denisova, E. D. Borgardt, A. Polunin, A. Katsman, M. M. Krishtal

{"title":"Improvement of protective oxide layers formed by high-frequency plasma electrolytic oxidation on Mg-RE alloy with LPSO-phase","authors":"A. O. Cheretaeva, P. Glukhov, M. R. Shafeev, Alyona G. Denisova, E. D. Borgardt, A. Polunin, A. Katsman, M. M. Krishtal","doi":"10.15826/chimtech.2023.10.2.12","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.2.12","url":null,"abstract":"Oxide layers on Mg97Y2Zn1 magnesium alloy with strengthening LPSO-phase were formed by plasma electrolytic oxidation (PEO) in bipolar mode with frequency variation of forming current pulses (50 and 500 Hz) and addition of sodium aluminate or sodium silicate to alkali phosphate fluoride electrolyte. Microstructure, chemical and phase composition, corrosion and mechanical properties of the oxide layers formed were investigated. With increasing current frequency for both electrolytes, an increase in homogeneity of the oxide layers structure and a decrease in their porosity and fracturing at constant thickness were recorded. The oxide layers formed at 500 Hz even with some decrease in hardness have better adhesive strength and 2 orders of magnitude higher short-term corrosion resistance values. PEO of Mg-alloy with LPSO-phase in the electrolyte with addition of sodium aluminate in combination with increased pulse frequency (500 Hz) allows forming the best-quality uniform oxide layer with high hardness, adhesive strength and corrosion resistance properties. The use of electrolyte with addition of sodium silicate reduced the adhesive strength by 1.5 times and brought down the long-term corrosion resistance of oxide layers by an order of magnitude, as compared with the electrolyte with sodium aluminate. The reason for a significant improvement in the complex of protective properties of the oxide layers with an increase in the current pulse frequency is supposed to be a decrease in the power and duration of individual microarc discharges with simultaneous increase in their number per unit oxidized area.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44129639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Synthesis and cytotoxic activity of (2-arylquinazolin-4-yl)hydrazones of 2-hydroxybenzaldehydes 2-羟基苯甲醛（2-芳基喹唑啉-4-基）腙的合成及其细胞毒性

Chimica Techno Acta Pub Date : 2023-05-04 DOI: 10.15826/chimtech.2023.10.2.11

E. Nosova, I. Butorin, M. D. Likhacheva, S. Kotovskaya

引用次数: 0

Voltammetric sensor based on molecular imprinted polymer for lincomycin determination 基于分子印迹聚合物的林可霉素伏安传感器的研究

Chimica Techno Acta Pub Date : 2023-04-28 DOI: 10.15826/chimtech.2023.10.2.10

Y. Yarkaeva, Daria A. Dymova, Marat I. Nazyrov, L. Zagitova, V. Maistrenko

引用次数: 0

A DFT-D4 investigation of the complexation phenomenon between pentachlorophenol and β-cyclodextrin 五氯酚与β-环糊精络合现象的DFT-D4研究

Chimica Techno Acta Pub Date : 2023-04-28 DOI: 10.15826/chimtech.2023.10.2.09

Zoubir Kabouche, Y. Belhocine, T. Benlecheb, Ibtissem Meriem Assaba, A. Litim, Rabab Lalalou, Asma Mechhoud

{"title":"A DFT-D4 investigation of the complexation phenomenon between pentachlorophenol and β-cyclodextrin","authors":"Zoubir Kabouche, Y. Belhocine, T. Benlecheb, Ibtissem Meriem Assaba, A. Litim, Rabab Lalalou, Asma Mechhoud","doi":"10.15826/chimtech.2023.10.2.09","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.2.09","url":null,"abstract":"Density functional theory (DFT) calculations based on the BLYP-D4 and PBEh-3c composite methods were performed for investigating the encapsulation mode of pentachlorophenol (PCP) inside the cavity of β-cyclodextrin (β-CD). Different quantum chemical parameters such as HOMO, LUMO, and HOMO–LUMO gap were calculated. Complexation energies were computed at the molecular level to provide insight into the inclusion of PCP inside the β-CD cavity. The Independent gradient model (IGM) approach was applied to characterize the non-covalent interactions that occurred during the complex (PCP@β-CD) formation. Two modes of inclusion were considered in this work (modes A and B). Calculated complexation energies as well as the changes in enthalpy, entropy, and free Gibbs energy exhibit negative values for both modes A and B, indicating a thermodynamically favorable process. Weak Van der Waals interactions and one strong intermolecular hydrogen bond act as the main driving forces behind the stabilization of the formed most stable complex. This study was carried out to explore the potential use of the β-CD as a host macrocycle for sensing and capturing pentachlorophenol.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43856048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Testing conditions for CoMo HDS catalyst in the kinetic region: integrated approach using the math calculations and catalytic experiments CoMo HDS催化剂动力学区测试条件:数学计算与催化实验相结合的方法

Chimica Techno Acta Pub Date : 2023-04-24 DOI: 10.15826/chimtech.2023.10.2.08

P. P. Mukhacheva, Yuliya V. Vatutina, I. Mik, K. Nadeina, M. O. Kazakov, O. P. Klenov, O. Klimov, A. Noskov

{"title":"Testing conditions for CoMo HDS catalyst in the kinetic region: integrated approach using the math calculations and catalytic experiments","authors":"P. P. Mukhacheva, Yuliya V. Vatutina, I. Mik, K. Nadeina, M. O. Kazakov, O. P. Klenov, O. Klimov, A. Noskov","doi":"10.15826/chimtech.2023.10.2.08","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.2.08","url":null,"abstract":"The main idea of the investigation was to define testing parameters with the lowest influence of internal and external diffusion on catalytic activity in hydrodesulfurization of dibenzothiophene. Traditional experimental methods were used to determine the conditions for the influence of internal and external diffusion. Simultaneous change of a linear feedstock rate and a catalyst loading at constant weight hour space velocity were used to determine the process temperature (240–260 °C) at which the impact of external diffusion is minimal. Catalytic tests, including the variation of the catalyst fraction size, were carried out to define the conditions with the lowest influence of internal diffusion. It was found that when the catalyst with the fraction size of 0.1–0.25 mm was used, the fluctuation of sulfur conversion was the smallest. Besides, to validate experimental results, the calculations were performed with mass balance equations and expressions used for HDS modeling. The resulting data and catalytic experiments demonstrated that the lowest influence of internal and external diffusion is achieved at a temperature process less than 260 °C and a catalyst fraction of 0.1–0.25 mm.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44406217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Crystallization kinetics of GdYScAlCo high-entropy bulk metallic glass GdYScAlCo高熵大块金属玻璃的结晶动力学

Chimica Techno Acta Pub Date : 2023-04-18 DOI: 10.15826/chimtech.2023.10.2.07

V. Bykov, D. A. Kovalenko, E. Sterkhov, T. Kulikova

引用次数: 0

Novel co-doped protonic conductors BaLa1.9Sr0.1In1.95M0.05O6.925 with layered perovskite structure 层状钙钛矿结构的新型共掺杂质子导体BaLa1.9Sr0.1In1.95M0.05O6.925

Chimica Techno Acta Pub Date : 2023-04-11 DOI: 10.15826/chimtech.2023.10.2.06

A. Bedarkova, N. Tarasova, I. Animitsa, E. Abakumova, I. Fedorova, P. Cheremisina, Evgenia Verinkina

引用次数: 0

Expedient synthesis of 1,2,4-triazinyl substituted benzo[c]coumarins via double oxidation strategy 双氧化法合成1,2,4-三嗪基取代苯并[c]香豆素

Chimica Techno Acta Pub Date : 2023-04-11 DOI: 10.15826/chimtech.2023.10.2.05

R. Fatykhov, I. Khalymbadzha, A. Sharapov, A. P. Potapova, E. Starnovskaya, D. Kopchuk, O. Chupakhin

{"title":"Expedient synthesis of 1,2,4-triazinyl substituted benzo[c]coumarins via double oxidation strategy","authors":"R. Fatykhov, I. Khalymbadzha, A. Sharapov, A. P. Potapova, E. Starnovskaya, D. Kopchuk, O. Chupakhin","doi":"10.15826/chimtech.2023.10.2.05","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.2.05","url":null,"abstract":"Herein, we report a convenient one-pot synthesis of 1,2,4-triazinyl derivatives of benzocoumarins. The proposed approach consists in the nucleophilic addition of tetrahydrobenzo annulated dimethoxycoumarin to 1,2,4-triazines followed by double oxidation of both dihydrotriazine and tetrahydrobenzo groups with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). The nucleophilic addition of the dimethoxycoumarin to 1,2,4-triazines was carried out in the presence of three-fold excess of methanesulfonic acid in DCM at room temperature and take place between positions 4 and 5 of coumarin and 1,2,4-triazine, respectively. The double oxidation step was achieved with 3.6 equivalent of DDQ. Selective oxidation of dihydrotriazine moiety, without affecting the tetrahydrobenzo fragment, was achieved using 1.2 equivalent of tetrachlorobenzoquinone (TCQ). The differences in the oxidation with TCQ and DDQ appear to be related to the higher oxidative potential of DDQ in contrast to TCQ. The advantages of the method are the elimination of the use of transition metals, the availability of starting materials, and the simplicity of the procedure. The proposed approach provides a two-step one-pot protocol for the synthesis of triazinyl benzocoumarins, precursors for the preparation of push-pull pyridinyl chromophore.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43054609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0