Journal of Supercritical Fluids最新文献_第2页

Copolymerization of acrylic acid and 2- acrylamido-2-methylpropane sulfonic acid in supercritical carbon dioxide

IF 3.9 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-28 DOI: 10.1016/j.supflu.2024.106485

Ramses S. Meleán Brito, Juan M. Milanesio, Juan M. Padró, Cristian Villa-Pérez, Aurélie Colas, Miriam C. Strumia, Séverine Camy, Mathias Destarac, Facundo Mattea

{"title":"Copolymerization of acrylic acid and 2- acrylamido-2-methylpropane sulfonic acid in supercritical carbon dioxide","authors":"Ramses S. Meleán Brito, Juan M. Milanesio, Juan M. Padró, Cristian Villa-Pérez, Aurélie Colas, Miriam C. Strumia, Séverine Camy, Mathias Destarac, Facundo Mattea","doi":"10.1016/j.supflu.2024.106485","DOIUrl":"https://doi.org/10.1016/j.supflu.2024.106485","url":null,"abstract":"This study explores the copolymerization of acrylic acid and <ce:italic>2</ce:italic>-acrylamido-<ce:italic>2</ce:italic>-methyl-1-propanesulfonic acid (AMPS) in supercritical carbon dioxide (scCO<ce:inf loc=\"post\">2</ce:inf>) as a sustainable alternative to traditional solvent-based methods. Using free-radical polymerization in scCO<ce:inf loc=\"post\">2</ce:inf>, copolymers were synthesized without the need for additional drying. The influence of AMPS concentration in the feed on copolymer properties was investigated, achieving reactions with monomer conversions ranging from 61.3 to 92.9 mol%. Analytical characterization confirmed low AMPS incorporation across samples, with molar mass and hydrodynamic properties varying based on the AMPS content. Notably, two distinct polymer configurations were observed depending on whether the initial AMPS concentration was above or below 12 mol%, with polymers exhibiting molar masses between 13.2×10⁵ and 14.2×10⁵ g mol<ce:sup loc=\"post\">−1</ce:sup>. Rheological analysis revealed that higher AMPS concentrations led to increased hydrodynamic radii, enhanced thickening capacity, and improved resistance to both monovalent (NaCl) and divalent (CaCl₂) salts in aqueous solutions.","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"24 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Failure behavior analysis of oxide film formed on super-heater tubes of boiler during deep peak process

IF 3.9 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-27 DOI: 10.1016/j.supflu.2024.106474

Chuang He, Tingshan Guo, Qinxin Zhao, Zhiyuan Liang

{"title":"Failure behavior analysis of oxide film formed on super-heater tubes of boiler during deep peak process","authors":"Chuang He, Tingshan Guo, Qinxin Zhao, Zhiyuan Liang","doi":"10.1016/j.supflu.2024.106474","DOIUrl":"https://doi.org/10.1016/j.supflu.2024.106474","url":null,"abstract":"High-temperature components in the supercritical power plant experienced alternating thermal stresses under deep peak regulation, accelerating the cracking and spalling of the oxide film formed on the steam-side of super-heaters and re-heaters. This study employed the corrosion testing and finite element simulations to investigate the failure behavior of oxide films on super-heaters made by heat-resistant steelsT91 and austenitic HR3C during deep peak conditions. The experimental results indicate that the oxide film on T91was a double layer film containing Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf> and Fe-Cr oxides, which was much thicker than that on HR3C. The spalling of the outer oxide film on T91 was more severe than that of HR3C. The analysis of thermal stress-strain under various loads and oxide film thicknesses revealed the significant shear stress between Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf> and Fe-Cr within the oxide film on T91 steel. The significant shear stress caused the bigger strain within the oxide film on T91 steel, causing the spalling of the oxide film. Compared to the strain within the oxide film on T91 steel, the stress-strain within Cr<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf> oxide film on HR3C steel was notably lower than that on T91 steel. The failure behaviors of the oxide film on T91 and HR3C were quantitatively explained through experimental result and stress-strain simulation with the oxide film. The failure models of the oxide film on investigated steels were put forward.","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"9 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142789993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Liquefaction of soybean husk in a semi-continuous mode by subcritical water

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-26 DOI: 10.1016/j.supflu.2024.106476

Crisleine P. Draszewski , Caroline M. Weise , Fransciso D. Vezaro , Flávio D. Mayer , Ederson R. Abaide , Fernanda de Castilhos

引用次数: 0

High-yield production of lactide isomers from depolymerization of polylactic acid in supercritical carbon dioxide 在超临界二氧化碳中通过解聚聚乳酸高产生产内酯异构体

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-22 DOI: 10.1016/j.supflu.2024.106473

Seda Sivri, Naime Aslı Sezgi, Cerag Dilek

引用次数: 0

Clean production and dyeing of fluorescent yellow dyes based on naphthalic anhydride in supercritical carbon dioxide 在超临界二氧化碳中清洁生产和染色基于萘酐的荧光黄色染料

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-22 DOI: 10.1016/j.supflu.2024.106470

Yutao Feng , Junyang Zhu , Hailong Cui , Ziyi Lu , Jinglong Li , Ying Wang , Chengqi Jiao , Xiaoqing Xiong

{"title":"Clean production and dyeing of fluorescent yellow dyes based on naphthalic anhydride in supercritical carbon dioxide","authors":"Yutao Feng , Junyang Zhu , Hailong Cui , Ziyi Lu , Jinglong Li , Ying Wang , Chengqi Jiao , Xiaoqing Xiong","doi":"10.1016/j.supflu.2024.106470","DOIUrl":"10.1016/j.supflu.2024.106470","url":null,"abstract":"<div><div>Supercritical carbon dioxide (scCO<sub>2</sub>) was selected as the medium for the synthesis and dyeing of four naphthalimide dyes (Y-1, Y-2, Y-3, and Y-4). They were synthesized through the reaction of 4-bromo-1,8-naphthalene dianhydride with various amines. These dyes demonstrated good photophysical properties and thermal stability, aligning with the prerequisites for scCO<sub>2</sub> dyeing. Consequently, the scCO<sub>2</sub> dyeing of polyester fabrics using these four dyes was investigated, and the optimal dyeing conditions were established in the range of 18<img>20 MPa, 120<img>130℃, and 80<img>90 min. Surface analysis confirmed the uniform distribution of the dyes on the fabrics, with no significant damage to the fabric structure under the dyeing conditions. Additionally, the dyed fabrics exhibited good color fastness to soap washing and friction with level 4 or above. Overall, the clean preparation and dyeing of naphthalimide dyes hold promise for reducing environmental pollution.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"217 ","pages":"Article 106470"},"PeriodicalIF":3.4,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the potential of supercritical carbon dioxide for eugenol impregnation in 3D printed polylactic acid structures 探索超临界二氧化碳在 3D 打印聚乳酸结构中浸渍丁香酚的潜力

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-19 DOI: 10.1016/j.supflu.2024.106469

Janet de los Angeles Chinellato Díaz , Marcelo R. Romero , María L. Goñi , Nicolás A. Gañán , Facundo Mattea

{"title":"Exploring the potential of supercritical carbon dioxide for eugenol impregnation in 3D printed polylactic acid structures","authors":"Janet de los Angeles Chinellato Díaz , Marcelo R. Romero , María L. Goñi , Nicolás A. Gañán , Facundo Mattea","doi":"10.1016/j.supflu.2024.106469","DOIUrl":"10.1016/j.supflu.2024.106469","url":null,"abstract":"<div><div>Biocompatible implants are essential for improving human health and longevity. Incorporating bioactive compounds, such as eugenol, into implant materials can improve biocompatibility and therapeutic efficacy. This study examines the effects of supercritical eugenol impregnation on the physical properties of 3D-printed polylactic acid samples produced by Fused Deposition Modeling. Impregnation was performed using a lab-scale high-pressure system, evaluating the impact of impregnation time on eugenol loading, distribution, and morphology. Fourier Transform Infrared spectroscopy confirmed homogeneous eugenol distribution with impregnation times exceeding 1 h, achieving loadings up to 12 wt%. Eugenol was released slowly over extended periods in a phosphate-buffered solution. Impregnated samples displayed more amorphous thermal behavior, with decreased Tg due to the plasticizing effect of the CO₂-eugenol mixture. Mechanical properties were slightly altered, with reduced stiffness and increased toughness. Microscopic deformations induced by impregnation could potentially enhance cellular adhesion, improving biocompatible material performance.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"217 ","pages":"Article 106469"},"PeriodicalIF":3.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recovery of bioactive compounds from pineapple waste through high-pressure technologies

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-17 DOI: 10.1016/j.supflu.2024.106455

Felipe de Andrade Maia, Luiz Henrique Fasolin

引用次数: 0

Extraction and isomerization of ultraviolet-absorbing substances, saclipins, from an edible cyanobacterium Aphanothece sacrum using subcritical water 利用亚临界水从可食用蓝藻 Aphanothece sacrum 中提取紫外线吸收物质--囊脂素并将其异构化

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-17 DOI: 10.1016/j.supflu.2024.106459

Mitsuya Ito , Masaki Honda , Hakuto Kageyama

{"title":"Extraction and isomerization of ultraviolet-absorbing substances, saclipins, from an edible cyanobacterium Aphanothece sacrum using subcritical water","authors":"Mitsuya Ito , Masaki Honda , Hakuto Kageyama","doi":"10.1016/j.supflu.2024.106459","DOIUrl":"10.1016/j.supflu.2024.106459","url":null,"abstract":"<div><div>The effects of the extraction conditions on the recovery and isomerization of the UV-absorbing saclipins from the edible cyanobacterium <em>Aphanothece sacrum</em> by subcritical water were investigated. The extraction temperature (100–160 ℃) did not affect the extraction efficiency of saclipins, but the pressure (5–15 MPa) had a significant effect. The saclipin B (<em>cis</em>-configuration) ratio in the extract increased with extraction temperature. Since saclipin A (<em>trans</em>-configuration) is predominant in the raw material, it is proposed that thermal-induced <em>cis</em>-isomerization occurs during the extraction process under elevated temperature conditions. Furthermore, we found that extraction with subcritical water resulted in higher extraction and isomerization efficiencies of saclipins than extraction with organic solvents. Extracts obtained by subcritical water extraction (SWE) exhibited antioxidant and anti-elastase activities and the degree of the activities was affected by the extraction temperature (i.e., saclipin isomer ratio). These findings could facilitate the development of sunscreens with enhanced skincare benefits, utilizing naturally-derived bioactive compounds.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"217 ","pages":"Article 106459"},"PeriodicalIF":3.4,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Supercritical fluid extraction of yerba mate: Decaffeination, purification, encapsulation, and controlled release 超临界流体萃取耶巴马黛茶：去咖啡因、提纯、封装和控释

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-15 DOI: 10.1016/j.supflu.2024.106456

Bruna Sgarioni, Luane C. Angeli, Matheus R. Andrade, Rubem M.F. Vargas, Eduardo Cassel

{"title":"Supercritical fluid extraction of yerba mate: Decaffeination, purification, encapsulation, and controlled release","authors":"Bruna Sgarioni, Luane C. Angeli, Matheus R. Andrade, Rubem M.F. Vargas, Eduardo Cassel","doi":"10.1016/j.supflu.2024.106456","DOIUrl":"10.1016/j.supflu.2024.106456","url":null,"abstract":"<div><div><em>Ilex paraguariensis</em> is a source of bioactive compounds, which have been demonstrated to mitigate neurological disorders and enhance athletic performance. This study aimed to decaffeinate yerba mate using supercritical fluid extraction, followed by caffeine purification. The purified extract was encapsulated in gelatin via spray drying, and its release profile was evaluated in simulated gastric fluid. A mathematical model was established to describe the release behavior of the encapsulated extract. The characterization of yerba mate leaves and extracts was conducted prior to and following purification via HPLC. The capsules were subjected to analysis using SEM, FTIR e TGA, while the release fluid was examined using ultraviolet spectroscopy. The optimized SFE process produced decaffeinated yerba mate and the resulting extract exhibited a caffeine purity of approximately 87 %. The capsules were observed to possess a spherical morphology and micrometric particle size, and the release profile was found to follow a first-order kinetic model.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"217 ","pages":"Article 106456"},"PeriodicalIF":3.4,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface wettability of lignin materials from supercritical water hydrolysis of wood 木材超临界水水解产生的木质素材料的表面润湿性

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2024-11-13 DOI: 10.1016/j.supflu.2024.106458

Vesna Leontijevic , Tijana Fechter , Danilo Cantero , Philip Jaeger , Maria José Cocero

{"title":"Surface wettability of lignin materials from supercritical water hydrolysis of wood","authors":"Vesna Leontijevic , Tijana Fechter , Danilo Cantero , Philip Jaeger , Maria José Cocero","doi":"10.1016/j.supflu.2024.106458","DOIUrl":"10.1016/j.supflu.2024.106458","url":null,"abstract":"<div><div>To meet the demands of the evolving circular economy, there is a growing need for renewable resources as base materials for innovative, easily recyclable products. Lignin, the second most abundant biopolymer, has emerged as a promising source of aromatics and reinforcing agent in polymer composites. For the successful manufacturing of homogeneous composite materials, good bonding between the coexisting phases is essential to prevent the formation of voids and agglomerates. Therefore, understanding the surface properties of these materials is crucial for designing optimal composite compounds. In this study, the wettability of lignin-cellulose composites and lignin samples obtained through supercritical water hydrolysis (SCWH) of birch wood is investigated. The contact angle (CA) technique, specifically the sessile drop method, was employed to assess and compare the wettability of SCWH lignin with commercially available lignin and raw birch wood. The results provide insights into their surface energy, adhesion, and hydrophilic or hydrophobic characteristics under processing conditions. All samples exhibited hydrophilicity, with an initial CA approximately 40 °, except for raw birch wood, which had a higher initial CA of ∼ 64°. Notably, when lignin is accompanied by significant amounts of cellulose, different trends in CA changes over time were observed. The influence of pressure on the CA between water and these polymers was also analyzed, but no significant impact was detected. This research advances the development of lignin-based materials with tailored surface properties for various industrial applications.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"217 ","pages":"Article 106458"},"PeriodicalIF":3.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0