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1. Novel quaternary oxide semiconductor for the application of gas sensors with long-term stability

Author:
Wang, Chong; Zhang, Yiqun; Zhao, Lianjing; Wang, Chenguang; Liu, Fangmeng; Sun, Xiaoying; Hu, Xiaolong; Lu, Geyu
Source:
Journal of colloid and interface science 2021 v.592 pp. 186-194
ISSN:
0021-9797
Subject:
acetone,   etc   ; relative humidity; semiconductors; temperature;     Show all 4 Subjects
Abstract:
... In this paper, quaternary oxide semiconductor was applied as sensing material for the fabrication of gas sensors. One-step solvothermal method was utilized to synthesize the sensing material. Various characterization methods including XRD, XPS, SEM, HRTEM were employed to analyze the composition and structure of the sensing material. Composite composed of CuInW₂O₈ and CuWO₄ was successfully prepar ...
DOI:
10.1016/j.jcis.2021.02.047

2. Study on the selective hydrogenation of isophorone

Author:
Xu, Lei; Sun, Shaoyin; Zhang, Xing; Gao, Haofei; Wang, Wei
Source:
RSC advances 2021 v.11 no.8 pp. 4465-4471
ISSN:
2046-2069
Subject:
acetone,   etc   ; hydrogenation; palladium; solvents; tetrahydrofuran;     Show all 5 Subjects
Abstract:
... 3,3,5-Trimethylcyclohexanone (TMCH) is an important pharmaceutical intermediate and organic solvent, which has important industrial significance. The selective hydrogenation of isophorone was studied over noble metal (Pd/C, Pt/C, Ir/C, Ru/C, Pd/SiO₂, Pt/SiO₂, Ir/SiO₂, Ru/SiO₂), and non-noble metal (RANEY® Ni, RANEY® Co, RANEY® Cu, RANEY® Fe, Ni/SiO₂, Co/SiO₂, Cu/SiO₂, Fe/SiO₂) catalysts and using ...
DOI:
10.1039/d0ra08107h

3. Highly efficient evaporation method to prepare pH-responsive lignin-hollow-nanosphere with controllable size and its application in oral drug delivery

Author:
Wang, Miao; Yang, Dongjie; Xu, Qinghe; Li, Peishi; Yi, Conghua; Qian, Yong; Qiu, Xueqing
Source:
Industrial crops and products 2021 v.162 pp. 113230
ISSN:
0926-6690
Subject:
acetone,   etc   ; evaporation; ibuprofen; lignin; nanospheres; pH; temperature;     Show all 7 Subjects
Abstract:
... In this study, we establish a novel highly efficient preparation process to prepare homogeneous and size controllable pH-responsive lignin nanosphere (LN). Orthogonal experiments have been performed to investigate the effects of the factors (bath temperature, lignin concentration, starting volume, cooling temperature) on the effective diameters (ED) and polydispersity index (PDI) of LN. The fast v ...
DOI:
10.1016/j.indcrop.2020.113230

4. All-nanoparticle layer-by-layer coatings for Mid-IR on-chip gas sensing

Author:
Al Husseini, Diana; Zhou, Junchao; Willhelm, Daniel; Hastings, Trevor; Day, Gregory S.; Zhou, Hong-Cai; Coté, Gerard L.; Qian, Xiaofeng; Gutierrez-Osuna, Ricardo; Lin, Pao Tai; Sukhishvili, Svetlana A.
Source:
Chemical communications 2020 v.56 no.91 pp. 14283-14286
ISSN:
1364-548X
Subject:
acetone,   etc   ; silica; zinc;     Show all 3 Subjects
Abstract:
... Functionalization of optical waveguides with submicron coatings of zinc peroxide (ZnO₂) and silica (SiO₂) nanoparticles (NPs) is reported that enabled selective concentration of acetone vapors in the vicinity of the waveguide, boosting the sensitivity of a mid infrared (MIR) on-chip detector. Controlled thickness was achieved by introducing precise control of the substrate withdrawal speed to the ...
DOI:
10.1039/d0cc05513a

5. Simple one-step synthesis of a two-dimensional perovskite consisting of perfluoroalkyl-based ammonium spacers using acetone as the solvent

Author:
Nishimura, Naoyuki; Tojo, Masahiro; Takeoka, Yuko
Source:
Chemical communications 2020 v.56 no.71 pp. 10293-10296
ISSN:
1364-548X
Subject:
acetone,   etc   ; ammonium; solvents;     Show all 3 Subjects
Abstract:
... Acetone, regarded as a poor solvent for perovskite materials, was found to be suitable for synthesis of the perfluoroalkyl-based two-dimensional (2D) perovskite (C₃F₇CH₂NH₃)₂PbBr₄. One-step synthesis gave this material as a pure phase exhibiting quantum- and dielectric-confinement effects. However, N,N-dimethylformamide (DMF), a traditional perovskite solvent, did not produce these properties. ...
DOI:
10.1039/d0cc03874a

6. Microwave-assisted synthesis of hierarchically porous Co3O4/rGO nanocomposite for low-temperature acetone detection

Author:
Gao, Yawu; Chen, Deliang; Hou, Xinghui; Zhang, Ying; Yi, Shasha; Ji, Haipeng; Wang, Yu; Yin, Li; Sun, Jing
Source:
Journal of colloid and interface science 2021 v.594 pp. 690-701
ISSN:
0021-9797
Subject:
acetone,   etc   ; adsorption; desorption; diabetes; microwave treatment; nanocomposites; nanosheets; temperature;     Show all 8 Subjects
Abstract:
... Acetone sensors with high response and excellent selectivity are of enormous demand for monitoring the diabetes. This paper has reported a novel porous 3D hierarchical Co₃O₄/rGO nanocomposite synthesized by a microwave-assisted method, by which Co₃O₄ nanoparticles are rapidly and uniformly anchored on rGO nanosheets. The phase composition, surface morphology of the Co₃O₄/rGO composites and the eff ...
DOI:
10.1016/j.jcis.2021.03.041

7. Ex-situ XPS analysis of yolk-shell Sb2O3/WO3 for ultra-fast acetone resistive sensor

Author:
Wang, Qiao; Wu, Hongchang; Wang, Yanrong; Li, Jianpeng; Yang, Yifan; Cheng, Xu; Luo, Yibing; An, Beixi; Pan, Xiaojun; Xie, Erqing
Source:
Journal of hazardous materials 2021 v.412 pp. 125175
ISSN:
0304-3894
Subject:
acetone,   etc   ; adsorption; desorption; detection limit; disease diagnosis; oxygen;     Show all 6 Subjects
Abstract:
... The preparation of fast, highly responsive and reliable gas sensing devices for the detection of acetone gas is considered to be a key challenge for the development of accurate disease diagnosis systems through exhaled respiratory gases. In the paper, yolk shell Sb₂O₃/WO₃ is synthesized and its gas sensing performance was studied by static test system. Special, the maximum response value of 1:1 Sb ...
DOI:
10.1016/j.jhazmat.2021.125175

8. Grid insensitive modelling of convective heat transfer fluxes in CFD simulations of medium-scale pool fires

Author:
Maragkos, Georgios; Merci, Bart
Source:
Fire safety journal 2021 v.120 pp. 103104
ISSN:
0379-7112
Subject:
acetone,   etc   ; convection; ethanol; fires; methanol; prediction; simulation models;     Show all 7 Subjects
Abstract:
... Focusing on convective heat transfer modelling of pool fires, different approaches for calculating the convective heat fluxes at the pool surface have been employed, namely to resolve them; model them based on Nusselt correlations for forced or natural convection; model them based on the stagnant film theory. Large eddy simulations of medium-scale, 30 cm in diameter, alcohol pool fires (methanol, ...
DOI:
10.1016/j.firesaf.2020.103104

9. Substitution Reactions in the Pyrolysis of Acetone Revealed through a Modeling, Experiment, Theory Paradigm

Author:
Zaleski, Daniel P.; Sivaramakrishnan, Raghu; Weller, Hailey R.; Seifert, Nathan A.; Bross, David H.; Ruscic, Branko; Moore, Kevin B.; Elliott, Sarah N.; Copan, Andreas V.; Harding, Lawrence B.; Klippenstein, Stephen J.; Field, Robert W.; Prozument, Kirill
Source:
Journal of the American Chemical Society 2021 v.143 no.8 pp. 3124-3142
ISSN:
1520-5126
Subject:
acetone,   etc   ; acetaldehyde; automation; enols; equations; propylene; pyrolysis; spectroscopy; temperature;     Show all 9 Subjects
Abstract:
... The development of high-fidelity mechanisms for chemically reactive systems is a challenging process that requires the compilation of rate descriptions for a large and somewhat ill-defined set of reactions. The present unified combination of modeling, experiment, and theory provides a paradigm for improving such mechanism development efforts. Here we combine broadband rotational spectroscopy with ...
DOI:
10.1021/jacs.0c11677

10. Iodonium salts as efficient iodine(iii)-based noncovalent organocatalysts for Knorr-type reactions

Author:
Yunusova, Sevilya N.; Novikov, Alexander S.; Soldatova, Natalia S.; Vovk, Mikhail A.; Bolotin, Dmitrii S.
Source:
RSC advances 2021 v.11 no.8 pp. 4574-4583
ISSN:
2046-2069
Subject:
acetone,   etc   ; bromine; catalytic activity; hydrazides; iodine; organocatalysts; pyrazoles; titration;     Show all 8 Subjects
Abstract:
... Hypervalent iodine(iii)-derivatives display higher catalytic activity than other aliphatic and aromatic iodine(i)– or bromine(i)-containing substrates for a Knorr-type reaction of N-acetyl hydrazides with acetyl acetone to give N-acyl pyrazoles. The highest activity was observed for dibenziodolium triflate, for which 10 mol% resulted in the generation of N-acyl pyrazole from acyl hydrazide and ace ...
DOI:
10.1039/d0ra09640g

11. Folin-Ciocalteu Reaction Alternatives for Higher Polyphenol Quantitation in Colombian Passion Fruits

Author:
Carmona-Hernandez, Juan C.; Taborda-Ocampo, Gonzalo; González-Correa, Clara H.
Source:
International Journal of Food Sciences 2021 v.2021
ISSN:
2314-5765
Subject:
acetone,   etc   ; Passiflora edulis; Passiflora ligularis; chromatography; polyphenols; pulp; solvents;     Show all 7 Subjects
Abstract:
... Passiflora edulis Flavicarpa, Passiflora edulis Sims, and Passiflora ligularis Juss are Colombian fruits (passion fruits) of important exportation value. They act efficiently as antioxidants, antifungal, and antimicrobial compounds due to their high polyphenol content. Polyphenols can be quantified by the Folin-Ciocalteu (F-C) reaction. Food matrices, solvent polarity, and several different reacti ...
DOI:
10.1155/2021/8871301

12. Lattice expansion and oxygen vacancy of α-Fe2O3 during gas sensing

Author:
Cao, Zhengmao; Jiang, Zhongwei; Cao, Liping; Wang, Yao; Feng, Changhao; Huang, Chengzhi; Li, Yuanfang
Source:
Talanta 2021 v.221 pp. 121616
ISSN:
0039-9140
Subject:
acetone,   etc   ; Raman spectroscopy; exhibitions; gels; materials; oxygen; research and development;     Show all 7 Subjects
Abstract:
... Identifying the nature of gas-sensing material under the real-time operating condition is very critical for the research and development of gas sensors. In this work, we implement in situ Raman and XRD to investigate the gas-sensing nature of α-Fe₂O₃ sensing material, which derived from Fe-based metal-organic gel (MOG). The active mode of α-Fe₂O₃ as gas-sensing material originate from the thermall ...
DOI:
10.1016/j.talanta.2020.121616

13. Orthoamide und Iminiumsalze, CI. Umsetzungen von N,N,N′,N′-Tetramethylharnstoffdiethylacetal mit CH₂-aciden Verbindungen

Author:
Kantlehner, Willi; Heckel, Birgit; Mezger, Jochen
Source:
Zeitschrift für Naturforschung 2020 v.75 no.9-10 pp. 865-880
ISSN:
1865-7117
Subject:
acetone,   etc   ; cyanides; guanidinium; nitrites; urea;     Show all 5 Subjects
Abstract:
... N,N,N′,N′-Tetramethylurea diethylacetal reacts with CH₂-acidic compounds as benzylcyanide, cyanoacetic acid derivatives malonodinitrile and nitromethane to give ketene aminals or ketene-O,N-acetales. Low polar solvents favour mostly the formation of ketenaminals. The yields of ketenaminals and ketene-O,N-acetals can be improved in some cases by addition of trimethylsilyldimethylamine. The reaction ...
DOI:
10.1515/znb-2020-0072

14. Multishelled NiO/NiCo2O4 hollow microspheres derived from bimetal-organic frameworks as high-performance sensing material for acetone detection

Author:
Chen, Qiong; Zhang, Yongheng; Ma, Shuyi; Wang, Yuhua; Wang, Peiyu; Zhang, Guoheng; Gengzang, Duojie; Jiao, Haiyan; Wang, Mingxiao; Chen, Wanjun
Source:
Journal of hazardous materials 2021 v.415 pp. 125662
ISSN:
0304-3894
Subject:
acetone,   etc   ; active sites; chemical composition; detection limit; hot water treatment; microparticles; nickel oxide; temperature;     Show all 8 Subjects
Abstract:
... Recently, tremendous research interest was stimulated to obtain advanced function materials with hierarchical structure and tailored chemical composition from metal-organic frameworks (MOFs) based precursors. Herein, Bimetal-organic frameworks of Ni-Co-BTC solid microspheres synthesized through hydrothermal method were acted as template to induce multishelled NiO/NiCo₂O₄ hollow microspheres by ann ...
DOI:
10.1016/j.jhazmat.2021.125662

15. Quantitative analysis of cabozantinib in pharmaceutical dosage forms using green RP-HPTLC and green NP-HPTLC methods: A comparative evaluation

Author:
Alam, Prawez; Salem-Bekhit, Mounir M.; Al-Joufi, Fakhria A.; Alqarni, Mohammed H.; Shakeel, Faiyaz
Source:
Sustainable chemistry and pharmacy 2021 v.21 pp. 100413
ISSN:
2352-5541
Subject:
acetone,   etc   ; antineoplastic agents; densitometry; ethanol; ethyl acetate; green chemistry; quantitative analysis; silica gel; thin layer chromatography;     Show all 9 Subjects
Abstract:
... In this study, a novel antitumor drug cabozantinib (CZN) was estimated by a validated green reversed-phase high-performance thin-layer chromatography (RP-HPTLC) and normal-phase high-performance thin-layer chromatography (NP-HPTLC) techniques in the marketed tablets and capsules. The RP-HPTLC densitometry analysis of CZN was carried out using “RP-18 silica gel 60 F254S HPTLC plates”. Green acetone ...
DOI:
10.1016/j.scp.2021.100413

16. The effectiveness of the Fucus virsoides and Cystoseira barbata fucoidan isolation as a function of applied pre-treatment and extraction conditions

Author:
Dobrinčić, Ana; Dobroslavić, Erika; Pedisić, Sandra; Balbino, Sandra; Elez Garofulić, Ivona; Čož-Rakovac, Rozelindra; Dragović-Uzelac, Verica
Source:
Algal research 2021 v.56 pp. 102286
ISSN:
2211-9264
Subject:
acetone,   etc   ; Cystoseira; Fucus; chemical composition; ethanol; fucoidan; fucose; macroalgae; research; solvents; sulfates; temperature; uronic acids;     Show all 13 Subjects
Abstract:
... Fucus virsoides and Cystoseira barbata are important sources of sulfated polysaccharide fucoidan which shows a wide range of biological activities. These activities are significantly dependent on chemical composition which is influenced by species, anatomical part of the seaweed, growing location and conditions, extraction procedures and analytical methods. The objective of this study was to evalu ...
DOI:
10.1016/j.algal.2021.102286

17. Characterization of phytochemical components and identification of main antioxidants in Crateva unilocalaris Buch. shoots by UHPLC-Q-Orbitrap-MS2 analysis

Author:
Ma, Qian; Cai, Shengbao; Liu, Xiaojing; Shi, Jiyuan; Yi, Junjie
Source:
Food research international 2021 v.143 pp. 110264
ISSN:
0963-9969
Subject:
acetone,   etc   ; Crateva; Iva; antioxidant activity; chlorogenic acid; dietary supplements; ethanol; flavonoids; food research; industry; methanol; saponins;     Show all 12 Subjects
Abstract:
... The chemical constituents and antioxidant activity of the three different extracts (80% methanol, 80% ethanol, and 80% acetone) of Crateva unilocalaris Buch. shoots were investigated. Six phenolic compounds and seven saponins were characterized in all extracts. Chikusetsusaponin IVa had the highest content (17.92 to 29.16 mg/g), and chlorogenic acid was the most abundant phenolic compound (10.48 t ...
DOI:
10.1016/j.foodres.2021.110264

18. Optimization of pressurized liquid extraction and ultrasound methods for recovery of anthocyanins present in jambolan fruit (Syzygium cumini L.)

Author:
Sabino, Luiz Bruno de Sousa; Filho, Elenilson Godoy Alves; Fernandes, Fabiano André Narciso; de Brito, Edy Sousa; Júnior, Ivanildo José da Silva
Source:
Food and bioproducts processing 2021 v.127 pp. 77-89
ISSN:
0960-3085
Subject:
acetone,   etc   ; Syzygium cumini; biobased products; ethanol; fruits; liquids; methanol; models; response surface methodology; ultrasonics;     Show all 10 Subjects
Abstract:
... This work aimed to evaluate and optimize the experimental conditions for the extraction of anthocyanins from jambolan (Syzygium cumini L) applying pressurized liquid extraction (PLE), bath ultrasound extraction (BUE), and probe ultrasound extraction (PUE). This work applied a non-factorial design to evaluate the extraction parameters and response surface methodology to optimize the extraction para ...
DOI:
10.1016/j.fbp.2021.02.012

19. Benzofuran–stilbene hybrid compounds: an antioxidant assessment – a DFT study

Author:
Van Trang, Nguyen; Thuy, Phan Thi; Mai Thanh, Dinh Thi; Son, Ninh The
Source:
RSC advances 2021 v.11 no.21 pp. 12971-12980
ISSN:
2046-2069
Subject:
acetone,   etc   ; activation energy; antioxidant activity; antioxidants; density functional theory; hydrogen; liquids; methanol; solvents;     Show all 9 Subjects
Abstract:
... The antioxidative activities of the original compound dehydro-δ-viniferin (1) and its three designated derivatives, 5-(2-(4-hydroxyphenyl)benzofuran-3-yl)benzene-1,3-diol (2), (E)-5-(2-(2-(4-hydroxyphenyl)benzofuran-5-yl)vinyl)benzene-1,3-diol (3), and (E)-5-(2-(3-(3,5-dihydroxyphenyl)benzofuran-5-yl)vinyl)benzene-1,3-diol (4), are extensively studied, mainly based on density functional theory (DF ...
DOI:
10.1039/d1ra01076j

20. Controlling the aqueous growth of urea crystals with different growth inhibitors: a molecular-scale study

Author:
Singh, M. K.
Source:
RSC advances 2021 v.11 no.21 pp. 12938-12950
ISSN:
2046-2069
Subject:
acetone,   etc   ; adsorption; biuret; crystallization; density functional theory; energy; growth models; solutes; solvents; thermodynamics; urea;     Show all 11 Subjects
Abstract:
... Molecular scale understanding of the mechanism of solution-mediated nucleation and the growth of crystalline materials in the presence of growth inhibitors together with the process parameters continues to attract the interest of the scientific community though much headway has been made in recent years. Growth inhibitors can be added to solution of a crystallizing parent molecule to alter the rat ...
DOI:
10.1039/d0ra10401a