Journal of Supercritical Fluids最新文献_第5页

New phase diagrams with anomalous region, supercritical solid-like state, liquid phase boundary, and dwij point 具有异常区、超临界类固态、液相边界和dwij点的新相图

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-05-10 DOI: 10.1016/j.supflu.2025.106644

Vish Prasad , Guo-Xiang Wang , Raad S. Haque , Laura M. Almara

{"title":"New phase diagrams with anomalous region, supercritical solid-like state, liquid phase boundary, and dwij point","authors":"Vish Prasad , Guo-Xiang Wang , Raad S. Haque , Laura M. Almara","doi":"10.1016/j.supflu.2025.106644","DOIUrl":"10.1016/j.supflu.2025.106644","url":null,"abstract":"<div><div>A Gibbs free energy-based thermodynamic analysis for regular fluids reveals the extension of liquid-vapor (L-V) line, beyond the critical point, to a newly discovered “Dwij point” (DP). At DP, this line turns around and goes back to the melt-solid (S-L) boundary, which together with the S-L and L-V lines delimits the region of liquid/supercritical liquid-like (L/SCLL) state. Consequently, a thermodynamic “solid-like” state is identified, which exists between the L/SCLL and melt-solid lines. Moreover, beyond DP only two phases, gas and solid exist, with the transition occurring via supercritical gas-like and solid-like states. These findings, in conjunction with the anomalous region around the critical point lead to historic modifications to the phase diagram. Consequently, the new phase diagrams for nine fluids are presented. Although the extension of supercritical liquid-like/gas-like boundary for hydrogen is similar, variations do exist. These discoveries may reconcile the thermodynamic transitions and dynamic transitions, which occur beyond DP.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106644"},"PeriodicalIF":3.4,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084504","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

On extinction of hydrothermal flames in laminar reactive jets 层流反应射流中热液火焰的熄灭研究

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-05-07 DOI: 10.1016/j.supflu.2025.106642

Peter V. Gordon , Uday G. Hegde , Michael C. Hicks

引用次数: 0

Enzymatic ring-opening polymerization of lactones in supercritical carbon dioxide: A review 超临界二氧化碳催化内酯开环聚合研究进展

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-05-05 DOI: 10.1016/j.supflu.2025.106645

Roseny D. Santos , Evertan A. Rebelatto , Diego A. Mayer , J. Vladimir Oliveira

{"title":"Enzymatic ring-opening polymerization of lactones in supercritical carbon dioxide: A review","authors":"Roseny D. Santos , Evertan A. Rebelatto , Diego A. Mayer , J. Vladimir Oliveira","doi":"10.1016/j.supflu.2025.106645","DOIUrl":"10.1016/j.supflu.2025.106645","url":null,"abstract":"<div><div>The polymerization of lactones has revealed the potential of polylactones for preparing biomaterials with attractive properties for biomedical applications. The use of green solvents and biocatalysts are fundamental steps towards the circularity of the synthesis of these polymers. Supercritical carbon dioxide has emerged as a green solvent for a variety of processes due to its hybrid liquid-gas properties, non-toxicity, and reusability. Novozym® 435 is the most widely used enzyme due to its excellent stability under high pressure. However, the high cost of this lipase is one of the limiting factors for its expansion to an industrial scale. The enzymatic polymerization of lactones in supercritical carbon dioxide is a promising technique for the production of high molar mass polyesters, although it presents challenges in becoming a completely green process. Thus, this work aims to provide an overview of the enzymatic polymerization of lactones in supercritical carbon dioxide, including the compilation and discussion of the developed research up to date. This review also presents the main challenges to overcome for the progress of this technology. In the future perspective, searching for cheaper enzymes and the development of an integrated process that allows the reuse of both the enzyme and CO<sub>2</sub> should be part of the research in the coming years. Furthermore, the synthesis of copolyesters employing this biosynthetic route is also a field to be explored, since the easy manipulation of the reaction conditions can offer a wider range of customized polymeric materials.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"224 ","pages":"Article 106645"},"PeriodicalIF":3.4,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927401","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

Targeting metastatic melanoma: Pumpkin seed extracts as potential antineoplastic agents 靶向转移性黑色素瘤：南瓜籽提取物作为潜在的抗肿瘤药物

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-29 DOI: 10.1016/j.supflu.2025.106643

Bruno Antônio Amarante , Eduardo Saccomori , Denise Bilibio , João Paulo Bender , Gilnei Bruno da Silva , Daiane Manica , Margarete Dulce Bagatini , Alessandra Nejar Bruno , Wagner Luiz Priamo

{"title":"Targeting metastatic melanoma: Pumpkin seed extracts as potential antineoplastic agents","authors":"Bruno Antônio Amarante , Eduardo Saccomori , Denise Bilibio , João Paulo Bender , Gilnei Bruno da Silva , Daiane Manica , Margarete Dulce Bagatini , Alessandra Nejar Bruno , Wagner Luiz Priamo","doi":"10.1016/j.supflu.2025.106643","DOIUrl":"10.1016/j.supflu.2025.106643","url":null,"abstract":"<div><div>In this study, the fatty acid composition and antitumor potential of pumpkin seed extracts, obtained through ultrasound-assisted extraction (UAE) and pressurized ethanol extraction (PEE) against melanoma cells was studied. An experimental design was employed to optimize parameters in both methods and gas chromatography identified the extracts based on fatty acids. SK-MEL-28 and A375 melanoma cells were treated with UAE and PEE extracts and assessed for viability (MTT assay, acridine orange staining), redox profile (NOx, PSH, NPSH), and mitochondrial membrane potential (MMP). The highest extraction yields were 48.99 % for UAE and 30.28 % for PEE. Major fatty acids included methyl linoleate (∼ 47 %) and methyl cis-9 oleate (∼ 25 %). Extracts reduced melanoma cell viability, increased NOx, and decreased MMP, particularly with UAE-derived extracts, highlighting the significance of the extraction method. These effects may be linked to altered redox balance, reduced MMP, and tumor cell death.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106643"},"PeriodicalIF":3.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918222","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

Extraction of β-carotene and lipids from wet biomass of the oleaginous yeast Rhodosporidium toruloides with supercritical CO2 超临界CO2从产油酵母红孢子虫湿生物质中提取β-胡萝卜素和脂质

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-24 DOI: 10.1016/j.supflu.2025.106641

Vanessa Buchweitz, Kilian Jörg, Jelena Pajnik, Mirjana Minceva

{"title":"Extraction of β-carotene and lipids from wet biomass of the oleaginous yeast Rhodosporidium toruloides with supercritical CO2","authors":"Vanessa Buchweitz, Kilian Jörg, Jelena Pajnik, Mirjana Minceva","doi":"10.1016/j.supflu.2025.106641","DOIUrl":"10.1016/j.supflu.2025.106641","url":null,"abstract":"<div><div>The present study investigated supercritical CO<sub>2</sub> extraction (SCE) of β-carotene and lipids from wet biomass of the oleaginous yeast <em>Rhodosporidium toruloides</em> to assess its potential as a green and energy-effective extraction process. The influence of the water content of the biomass on the extraction kinetics was investigated by performing SCE with biomass with different water contents (80.3 wt%, 40 wt%, and 3 wt%). The CO<sub>2</sub> flowrate was set to 0.240 g s<sup>−1</sup>. Despite an initial delay in the extraction process, the extraction yields from wet and dried biomass after 195 min (50 °C and 250 bar) showed no significant difference, confirming that an energy-intensive drying step before extraction can be avoided. The effects of temperature (40 °C - 70 °C) and pressure (200 bar - 400 bar) on extraction kinetics were systematically studied. Ethanol as a co-solvent significantly improved extraction efficiency, increasing β-carotene yield (up to 77 %) and lipid yield (up to 49 %). Yeast intracellular lipids were proven to act as an effective natural co-solvent for β-carotene extraction, as evidenced by the significant improvement in β-carotene recovery by 63 % when 10 wt% sunflower oil was added to the wet biomass as a co-solvent. The fatty acid methyl esters (FAME) analyses showed that the extraction conditions did not influence the FAME composition. The obtained extracts exhibited notable antioxidant activity, with an IC<sub>50</sub> of approximately 2 mg mL<sup>−1</sup>, highlighting the potential of the oleaginous yeast <em>Rhodosporidium toruloides</em> as a valuable source for applications in functional foods and pharmaceutical products.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106641"},"PeriodicalIF":3.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876828","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

Advances in supercritical fluid chromatography for lipid analysis and purification – A review of the past decade 超临界流体色谱法用于脂质分析和纯化的研究进展

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-23 DOI: 10.1016/j.supflu.2025.106638

Lou Spanneut , Thibaut Devièse

{"title":"Advances in supercritical fluid chromatography for lipid analysis and purification – A review of the past decade","authors":"Lou Spanneut , Thibaut Devièse","doi":"10.1016/j.supflu.2025.106638","DOIUrl":"10.1016/j.supflu.2025.106638","url":null,"abstract":"<div><div>This review explores the advances in Supercritical Fluid Chromatography (SFC) for the analysis and purification of lipids achieved over the past decade. Lipidomics has become an essential tool in numerous fields such as biology and food science. Compared to liquid and gas chromatography, SFC, which utilizes supercritical CO₂ as a mobile phase, offers faster analysis, reduced solvent use, and improved separation of complex lipidic substances. This review synthesizes findings from over 80 studies, evaluating various stationary phases, retention mechanisms, and optimized conditions for both lipid class and intra-class separations. It provides detailed comparisons of columns for different lipid types, such as fatty acids, glycerolipids, and phospholipids, and explores preparative-scale applications for bioactive lipid purification, including omega-3 fatty acids and sterols. By consolidating this knowledge, this review will serve as a practical guide for chemists to select optimal columns and conditions without extensive testing, thereby streamlining method development and reducing costs.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106638"},"PeriodicalIF":3.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891685","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

Green preparation of lightweight and elastic poly (butylene adipate-co-terephthalate)/thermoplastic polyamide elastomer composite foams 绿色制备轻质弹性聚己二酸丁二酯/热塑性聚酰胺弹性体复合泡沫

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-21 DOI: 10.1016/j.supflu.2025.106635

Xuelin Zhang, Peiying Yue, Xiulu Gao, Yichong Chen, Ling Zhao, Dongdong Hu

引用次数: 0

Melting point depression of tetrabutylammonium halides in supercritical carbon dioxide 超临界二氧化碳中四丁基卤化铵熔点的降低

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-17 DOI: 10.1016/j.supflu.2025.106637

Dóra Arany, Márton Kőrösi

引用次数: 0

Numerical simulation of clean separation through gas-liquid phase transition of gas products from biomass gasification in supercritical CO2 using a supersonic nozzle 超临界CO2条件下生物质气化产物气-液相变洁净分离的数值模拟

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-17 DOI: 10.1016/j.supflu.2025.106636

Hongtu Wu , Yimeng Wei , Zhiheng Huang , Qingang Xiong , Hui Jin

{"title":"Numerical simulation of clean separation through gas-liquid phase transition of gas products from biomass gasification in supercritical CO2 using a supersonic nozzle","authors":"Hongtu Wu , Yimeng Wei , Zhiheng Huang , Qingang Xiong , Hui Jin","doi":"10.1016/j.supflu.2025.106636","DOIUrl":"10.1016/j.supflu.2025.106636","url":null,"abstract":"<div><div>The supercritical CO<sub>2</sub> biomass gasification technology can both reduce CO<sub>2</sub> to produce CO gas and efficiently utilize biomass energy. This study employs a supersonic nozzle to achieve clean separation of gas products from supercritical CO<sub>2</sub> biomass gasification, enabling CO<sub>2</sub> recycling and reducing the cost of further CO purification. Numerical simulation results indicate that the inlet conditions of the nozzle significantly affect the gas-liquid phase transition of the mixed gas, allowing for the recovery of approximately 0.065 mass fraction of CO<sub>2</sub>. The shape of the nozzle's convergent section has negligible influence on the phase transition of the gas, whereas increasing the length of the divergent section effectively enhances the recovery of CO<sub>2</sub> at the outlet by promoting droplet growth. Variations in the composition of the mixed gas have a certain impact on the number of droplets formed during the phase transition, but the overall effect on the condensation process is minor.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106636"},"PeriodicalIF":3.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847702","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

Performance of oil well cements before and after being exposed to supercritical CO2: Evaluation of combined chemical additives 油井水泥在超临界CO2作用前后的性能：复合化学添加剂的评价

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-17 DOI: 10.1016/j.supflu.2025.106634

Daniel Hastenpflug , Natália Feijó Lopes , Giovanni dos Santos Batista , Jairo José de Oliveira Andrade , Eleani Maria da Costa

{"title":"Performance of oil well cements before and after being exposed to supercritical CO2: Evaluation of combined chemical additives","authors":"Daniel Hastenpflug , Natália Feijó Lopes , Giovanni dos Santos Batista , Jairo José de Oliveira Andrade , Eleani Maria da Costa","doi":"10.1016/j.supflu.2025.106634","DOIUrl":"10.1016/j.supflu.2025.106634","url":null,"abstract":"<div><div>In this study the individual effects of water/binder (0.44, 0.35, 0.30, and 0.25), polycarboxylate superplasticizer- PCE (0.07 wt%, 0.14 wt%, and 0.21 wt%), defoamer-DF (0.5 % and 1 %), and silica fume-SF (10 wt%, 15 wt%, and 20 wt%) admixtures in oil well cement Class G properties were investigated before and after exposure to CO<sub>2</sub> under high pressure and high temperature (HPHT) of 150 bar and 70°C. Spread diameter, compressive strength, Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) were used for characterization. Moreover, the microstructure of the samples was observed with scanning electron microscopy (SEM). The results reveal that the w/b ratio is a crucial factor for improving cement paste properties, with lower ratios resulting in lower porosity (higher carbonation resistance) and higher compressive strength. PCE enhances dispersion and cohesion, with optimal results achieved at a low w/b ratio (0.25). Although high dosages of PCE increased carbonation depth, they significantly improved the workability. DF reduces air incorporation, increasing cement matrix density, compressive strength, and resistance against CO<sub>2</sub> attack. SF significantly improves mechanical properties and microstructure, especially at higher addition levels. However, as SF is added, the higher the carbonation depth. Additionally, the synergistic behavior of additives was evaluated after determining the optimum value for each one. The optimal mixture with the lowest water/binder ratio and highest PCE, DF and SF amounts achieved improved properties in the hardened state with good slurry workability. It also provided the lowest carbonation depth under geological carbon storage conditions.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106634"},"PeriodicalIF":3.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847703","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