Chimica Techno Acta最新文献_第6页

Molecular dynamic simulation of the [N(C4H9)4]BF4 / (110) α-Al2O3 interface [N(C4H9)4]BF4 / (110) α-Al2O3界面的分子动力学模拟

Chimica Techno Acta Pub Date : 2023-08-16 DOI: 10.15826/chimtech.2023.10.3.08

I. Gainutdinov, N. Uvarov

{"title":"Molecular dynamic simulation of the [N(C4H9)4]BF4 / (110) α-Al2O3 interface","authors":"I. Gainutdinov, N. Uvarov","doi":"10.15826/chimtech.2023.10.3.08","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.3.08","url":null,"abstract":"The structure and transport properties of the pure salt [N4]BF4 and this salt located in the contact with the (110) surface of a-Al2O3 were studied using a MD computer simulation in order to reveal the effect of the salt/oxide interface on the structure and properties of the salt. The radial distribution functions of the ions and their mean square displacements were analyzed as a function of the temperature during the cooling of the salt. It was found that in all the cases anions are more mobile than cations. The molten phase of [N4]BF4 tends to crystallize at temperature 420 K which is close to the experimental melting point. The salt located in the [N4]BF4/(110)Al2O3 interface exhibits high values of anion self-diffusion coefficients which are higher by 1.2–2 orders of magnitude than in pure salt. This effect is likely to be caused by the formation of a layered atomic structure located within a characteristic thickness of 5 nm. Despite the structuring, the structure of the salt is amorphous, no crystallization-related effect is observed. The results of MD simulations agree with the experimental effect of the conductivity enhancement observed previously in [N4]BF4-Al2O3 nanocomposites.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45655332","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

Ceramic materials based on lanthanum zirconate for the bone augmentation purposes: cytocompatibility in a cell culture model 用于骨增强目的的锆酸镧陶瓷材料：细胞培养模型中的细胞相容性

Chimica Techno Acta Pub Date : 2023-08-16 DOI: 10.15826/chimtech.2023.10.4.02

M. Ulitko, Yu. P. Antonets, I. Antropova, Albert Mullabaev, E. Volokitina, A. Kasyanova, Ekaterina Loginova, Nataliia Tarasova

引用次数: 0

Increase of solubility and transmembrane permeability of niclosamide from its mechanochemically synthesized solid dispersions 机械化学合成的氯硝柳胺固体分散体增加其溶解度和跨膜渗透性

Chimica Techno Acta Pub Date : 2023-08-14 DOI: 10.15826/chimtech.2023.10.3.07

E. Meteleva, Elizaveta A. Roenko, N. Polyakov

{"title":"Increase of solubility and transmembrane permeability of niclosamide from its mechanochemically synthesized solid dispersions","authors":"E. Meteleva, Elizaveta A. Roenko, N. Polyakov","doi":"10.15826/chimtech.2023.10.3.07","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.3.07","url":null,"abstract":"More than 4.5 billion people worldwide are affected by parasitic diseases, with helminth infections accounting for 99% of the total number. Niclosamide (NS) is a weakly acidic active pharmaceutical ingredient (API) used to treat helminth infections. However, the pharmaceutical use of pure niclosamide is limited by its low bioavailability due to its poor aqueous solubility. The aim of this work is a mechanochemical preparation of niclosamide solid dispersions with increased solubility. Due to the pH dependence of NS water solubility and possible complexes formation, NS solid dispersions (SD) with 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) and alkalizing agents, such as calcium carbonate (CaCO3) and N-methyl-D-glucamine (MG) are mechanochemically prepared in this study. The physical properties of NS SD in solid state are characterized by differential scanning calorimetry, X-ray diffraction, FT-IR spectroscopy, and scanning electron microscopy studies. The characteristics of the water solutions formed from the obtained SDs are analyzed by HPLC. It is shown that the solubility increases for all studied compositions. These phenomena are obliged by complexation with HP-β-CD, which was shown by 1H-NMR methods, and enhanced ionization in the cases of using calcium carbonate and MG. Results of the parallel artificial membrane permeability assay (PAMPA) have shown that mechanochemically obtained NS/MG SD (1/1 mass ratio, 8 h milling) significantly enhances permeation of NS across an artificial membrane. Thus, the obtained compositions are a promising basis for the development of NS-based preparations for oral administration, with reduced dose and high pharmacological effect.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44712286","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

Decomposition of light hydrocarbons on a Ni-containing glass fiber catalyst 轻碳氢化合物在含镍玻璃纤维催化剂上的分解

Chimica Techno Acta Pub Date : 2023-08-08 DOI: 10.15826/chimtech.2023.10.3.06

M. Popov, M. Chudakova, P. B. Kurmashov, A. Bannov, A. V. Kleimenov, Prof. N. Uvarov, Prof. E. Aubakirov

引用次数: 0

Study on methylene blue adsorption using cashew nut shell-based activated carbon 腰果壳基活性炭吸附亚甲基蓝的研究

Chimica Techno Acta Pub Date : 2023-08-07 DOI: 10.15826/chimtech.2023.10.4.01

H. Tran, Dinh Quan Nguyen

{"title":"Study on methylene blue adsorption using cashew nut shell-based activated carbon","authors":"H. Tran, Dinh Quan Nguyen","doi":"10.15826/chimtech.2023.10.4.01","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.4.01","url":null,"abstract":"Adsorption is a widely used technique for the treatment of wastewater containing dyes, which are pollutants that can have serious impacts on the aquatic ecosystems. In this work, activated carbon (AC) was prepared from cashew nut shell (CNS) and used to adsorb methylene blue (MB) from solution. The CNS AC was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and nitrogen adsorption-desorption isotherms. The adsorption behavior of MB on CNS AC was investigated by varying the initial solution pH, adsorbent dosage, and initial MB concentration. The results showed that the CNS AC was effective for MB removal, with an adsorption capacity of 24.8 mg/g. The adsorption nature of MB onto the CNS AC surface was explored by analyzing the experimental data using isotherm and kinetic models. The Freundlich and Dubinin-Radushkevich (D-R) isotherm models showed good agreement with the experimental adsorption equilibrium results. The mean adsorption energy was found to be 22.4 kJ/mol, indicating chemical adsorption. The adsorption of MB on the CNS AC followed pseudo-second-order kinetics. This study demonstrates the potential application of CNS AC for MB removal.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43509206","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

The effect of ammonia activation on the desalination potential of natural zeolite 氨活化对天然沸石脱盐潜力的影响

Chimica Techno Acta Pub Date : 2023-08-04 DOI: 10.15826/chimtech.2023.10.3.05

A. Kenessova, A. Rakhym, Bagashar B. Zhaksybay, G. Seilkhanova

{"title":"The effect of ammonia activation on the desalination potential of natural zeolite","authors":"A. Kenessova, A. Rakhym, Bagashar B. Zhaksybay, G. Seilkhanova","doi":"10.15826/chimtech.2023.10.3.05","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.3.05","url":null,"abstract":"Despite the abundance of water bodies on Earth, there is a limited amount of potable water. Therefore, the desalination process is of great interest. Adsorption of the main contaminants of saline water (Na+, K+, Cl– ions) is an alternative process of desalination. In the present work, a sorbent based on natural zeolite (NZ) modified with ammonium chloride (NH4Cl) is obtained and the effect of modification on the removal of Na+ and K+ ions from saline water is studied. According to the Brunauer-Emmett-Teller (BET) analysis, the modification of zeolite with NH4Cl leads to an increase in its surface area (7.85 to 8.09 m2/g). According to the results of the cation exchange capacity (CEC) determination, the modification leads to a decrease in total CEC of zeolite (431.67±29.01 to 300.88±31.86 meq/100 g). According to the obtained results, ammonia modification enhances the adsorption ability of NZ to extract Na+ and K+ ions from saline water. The extraction degree (E) of Na+ ions by NH4-Z increases from 7.93±1.63 to 10.44±1.52%, while for K+ ions it increases about 2 times (27.69±2.45 to 56.46±3.71%). These results indicate that the ammonia-modified NZ can potentially be used as a desalination agent for the removal of Na+ and K+ ions from saline water.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44992556","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

High purity β-Bi2O3 preparation by thermal decomposition of tartrates 酒石酸盐热分解法制备高纯度β-Bi2O3

Chimica Techno Acta Pub Date : 2023-08-03 DOI: 10.15826/chimtech.2023.10.3.04

E. Timakova, Tatiana E. Timakova, Liubov I. Afonina

引用次数: 0

Synthesis of nanopowders by the glycine-nitrate method in the In-Dy-O system 甘氨酸-硝酸盐法在in - dy - o体系中合成纳米粉体

Chimica Techno Acta Pub Date : 2023-07-31 DOI: 10.15826/chimtech.2023.10.3.03

T. Malinovskaya, S. Ghyngazov, Alexander I. Aparnev, V. Zhek

引用次数: 0

Influence of anionic surfactant on stability of nanoparticles in aqueous solutions 阴离子表面活性剂对纳米颗粒水溶液稳定性的影响

Chimica Techno Acta Pub Date : 2023-07-27 DOI: 10.15826/chimtech.2023.10.3.02

Dmitry O. Zelentsov, Y. Petrova, Alexander V. Korobkin, A. Ivanova, A. Cheremisin, I. Shanenkov, A. Pak, Y. Mateyshina

{"title":"Influence of anionic surfactant on stability of nanoparticles in aqueous solutions","authors":"Dmitry O. Zelentsov, Y. Petrova, Alexander V. Korobkin, A. Ivanova, A. Cheremisin, I. Shanenkov, A. Pak, Y. Mateyshina","doi":"10.15826/chimtech.2023.10.3.02","DOIUrl":"https://doi.org/10.15826/chimtech.2023.10.3.02","url":null,"abstract":"Dispersion and aggregation of nanoparticles in aqueous solutions are important factors for safe and effective application of nanoparticles, for instance, in the oil industry. As conventional oil reserves are depleted, it is necessary to advance chemical enhanced oil recovery (cEOR) techniques to develop unconventional oil reservoirs. Nanoparticles modified by surfactants can be a promising reagent in cEOR. These nanomaterials can reduce interfacial tension and change the wettability of reservoir rock, which leads to an increase in oil recovery. However, the application of nanoparticles is limited by their substantial aggregation in aqueous solutions. The purpose of this work is to select nanoparticles for obtaining stable sols in water in the presence of an anionic surfactant and to optimize the conditions (pH) for further modifying the nanoparticles with the anionic surfactant. Sodium dodecyl sulfate (SDS) is used as an anionic surfactant. The aggregation of oxide and carbon nanoparticles in water and anionic surfactant solutions was studied by laser diffraction, dynamic and electrophoretic light scattering methods. Most of the studied nanoparticles in water form aggregates with bi-, three- and polymodal particle size distributions. TiO2 nanoparticles obtained by plasma dynamic synthesis form the most stable sols in anionic surfactant solutions. The range of 5–7 pH is defined as optimal for their modification with surfactants. The stability of carbon nanoparticles in aqueous solutions increases significantly in the presence of a surfactant. The obtained results form the basis for further research on the modification of marked nanoparticles in surfactant solutions.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44040858","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

Complexes of polyvinylpyrrolidone and polyethylene glycol with palladium(II) ions: characterization and catalytic activity 聚乙烯吡咯烷酮和聚乙二醇与钯离子的配合物:表征和催化活性

Chimica Techno Acta Pub Date : 2023-07-24 DOI: 10.15826/chimtech.2023.10.3.01

D. Akbayeva, I. Smagulova, Azhar Timurkyzy, B. Bakirova

引用次数: 0