Journal of Supercritical Fluids最新文献_第4页

Fractionation of lipophilic compounds of Tagetes patula flowers by using consecutive 2-step extraction with different CO2 densities 不同CO2浓度连续两步萃取分离万寿菊花的亲脂性化合物

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-04 DOI: 10.1016/j.supflu.2025.106613

Laura Jūrienė, Renata Baranauskienė, Jovita Jovaišaitė, Audrius Pukalskas, Petras Rimantas Venskutonis

{"title":"Fractionation of lipophilic compounds of Tagetes patula flowers by using consecutive 2-step extraction with different CO2 densities","authors":"Laura Jūrienė, Renata Baranauskienė, Jovita Jovaišaitė, Audrius Pukalskas, Petras Rimantas Venskutonis","doi":"10.1016/j.supflu.2025.106613","DOIUrl":"10.1016/j.supflu.2025.106613","url":null,"abstract":"<div><div>Distillation has been widely applied for the recovery of <em>Tagetes patula</em> L. essential oil, while fractional supercritical fluid extraction of this plant with carbon dioxide (SFE-CO<sub>2</sub>) remains underexplored and data on the volatiles and phytochemicals in CO<sub>2</sub> extracts have not been reported. This study investigated the fractionation of <em>T. patula</em> flowers using supercritical CO<sub>2</sub>, with initial extraction at lower pressure (10 MPa, 40°C; SFE-CO<sub>2</sub>-I) followed by further extraction at higher pressure (45 MPa, 50°C; SFE-CO<sub>2</sub>-II). Essential oil obtained by hydro-distillation contained the most volatiles, followed by SFE-CO<sub>2</sub>-I, while SFE-CO<sub>2</sub>-II was a poor volatile source. Higher pressure yielded 1.25–2.9 times less phytosterols, tocopherols, and unsaturated fatty acids compared to lower pressure, but was more effective for plant pigment (chlorophylls, carotenoids) extraction. The results demonstrate that different lipophilic compound classes in <em>T. patula</em> flowers can be selectively concentrated at varying pressures, highlighting the potential of SFE-CO<sub>2</sub> fractionation.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106613"},"PeriodicalIF":3.4,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143816807","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}

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Optimized production of Yellow 2G nanoparticles via supercritical gas anti-solvent process for advanced application in supercritical dyeing 超临界气体抗溶剂工艺优化制备黄色2G纳米颗粒，用于超临界染色

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-03 DOI: 10.1016/j.supflu.2025.106620

Jafar Akbari , Seyed Ali Sajadian , Nedasadat Saadati Ardestani , Mitra Amani

{"title":"Optimized production of Yellow 2G nanoparticles via supercritical gas anti-solvent process for advanced application in supercritical dyeing","authors":"Jafar Akbari , Seyed Ali Sajadian , Nedasadat Saadati Ardestani , Mitra Amani","doi":"10.1016/j.supflu.2025.106620","DOIUrl":"10.1016/j.supflu.2025.106620","url":null,"abstract":"<div><div>High-quality, efficient dye and pigment nanoparticles are ideal for supercritical dyeing in the textile industry, an eco-friendly and water-free dyeing method. This study investigates the precipitation of Yellow 2G nanoparticles, an azo dye, via the supercritical gas anti-solvent (GAS) process under varying pressures (10 MPa, 12.5 MPa, and 15 MPa), solute concentrations (0.1 mg.ml<sup>−1</sup>, 0.3 mg.ml<sup>−1</sup>, and 0.5 mg.ml<sup>−1</sup>), and temperatures (308 K, 318 K, and 328 K), using the Box-Behnken design (BBD) approach. Results indicated that higher pressure, lower temperature, and reduced solute concentration favor the formation of uniform Yellow 2G nanoparticles. In this study, nanoparticles ranging from 168.8 nm to 760.8 nm were successfully generated, with 318 K, 15 MPa, and an initial concentration of 0.1 mg.ml<sup>−1</sup> identified as the optimal conditions. The features of the produced nanoparticles were assessed through HPLC, FESEM, XRD, DSC, and FTIR analyses. HPLC analysis confirmed the purity of the produced nanoparticles, while XRD and DSC results indicate a decrease in crystallinity and particle size. Additionally, FESEM observations verified that the precipitated dye particles were within the nano-scale range.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106620"},"PeriodicalIF":3.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792799","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}

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Sustainable utilization of disposed photovoltaic backsheet to microcellular thermal-insulation foam through two-steps supercritical CO2 foaming 通过两步超临界CO2发泡，利用废弃光伏背板制备微孔隔热泡沫材料

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-02 DOI: 10.1016/j.supflu.2025.106616

Miao Lu , Jiyun Jia , Quan Gao , Mingxu Xia , Jin Li , Jun Wang , Chul B. Park , Ruiyan Zhang

{"title":"Sustainable utilization of disposed photovoltaic backsheet to microcellular thermal-insulation foam through two-steps supercritical CO2 foaming","authors":"Miao Lu , Jiyun Jia , Quan Gao , Mingxu Xia , Jin Li , Jun Wang , Chul B. Park , Ruiyan Zhang","doi":"10.1016/j.supflu.2025.106616","DOIUrl":"10.1016/j.supflu.2025.106616","url":null,"abstract":"<div><div>Upcycling of disposed photovoltaic backsheets plays important role in sustainable development of the photovoltaic industrial chain. However, the melt strength of the main component (rPET) decreased dramatically after long-term outside exposure, it is still challenging to develop a rPET-based microcellular thermal-insulation foam. Herein, we utilize a crystalline-amorphous network (CAN) strategy to enhance rPET melt strength and develop microcellular thermal-insulation material via supercritical CO<sub>2</sub> (scCO<sub>2</sub>) foaming technology. The tunable CAN fractions can be achieved by manipulation of crystallinity and rigid amorphous fraction (RAF) via annealing processes. The crystallinity was increased to 31.9 % for the sample annealed at the temperature of 115 °C, while the RAF value rose to 44.6 %. Consequently, the zero-shear complex viscosity (<span><math><msubsup><mrow><mi>η</mi></mrow><mrow><mn>0</mn></mrow><mrow><mo>*</mo></mrow></msubsup></math></span>) of rPET samples increased from 164.2 Pa·s to 1826.6 Pa·s with increased CAN fractions up to 76.5 %, demonstrating a typical shear-thinning behavior. Combined with the scCO<sub>2</sub> foaming technology, the void fraction can be tuned from 31.6 % to 83.5 %. The cell density was optimized, reaching a high value of 1.12 × 10<sup>9</sup> cells/cm<sup>3</sup> with the CAN fraction of 21.5 %. Furthermore, the thermal conductivity decreased from 254 mW•m<sup>−1</sup>K<sup>−1</sup> for a solid rPET sample to 47.3 mW•m<sup>−1</sup>K<sup>−1</sup> for thermal-insulation rPET foam. As a proof of concept, this work provides a novel route for resource utilization of disposed photovoltaic backsheet.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106616"},"PeriodicalIF":3.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792481","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}

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Precision control of ultrasmall metal oxides under continuous flow hydrothermal synthesis 超细金属氧化物连续流水热合成的精度控制

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-02 DOI: 10.1016/j.supflu.2025.106618

Akira Yoko , Yuki Omura , Nobutaka Chiba , Chunli Han , Satoshi Ohara , Tadafumi Adschiri

{"title":"Precision control of ultrasmall metal oxides under continuous flow hydrothermal synthesis","authors":"Akira Yoko , Yuki Omura , Nobutaka Chiba , Chunli Han , Satoshi Ohara , Tadafumi Adschiri","doi":"10.1016/j.supflu.2025.106618","DOIUrl":"10.1016/j.supflu.2025.106618","url":null,"abstract":"<div><div>Recently, ultrasmall metal oxide nanoparticles from 1.5 nm in size were synthesized by organic–inorganic reactions under hydrothermal conditions. Precise control of the particle size was achieved by changing the reaction time using a flow reactor. The continuous flow hydrothermal synthesis method is highly promising for exploring new features of metal oxides. In this study, the growth behavior of organically modified ultrasmall metal oxides is studied by varying the process conditions and materials, such as the chain length of the organic modifier, core particle species, metal precursor concentration, and flow dynamics. This study focuses on the initial rapid growth stage, ranging from 40 ms to 10 s, to achieve the precise control of ultrasmall metal oxides (1–5 nm). The results show that varying the core particle compositions and chain length of organic modifiers significantly affect the initial growth rate. Furthermore, higher concentrations and flow rates are advantageous for obtaining smaller particles and are suitable for large-scale synthesis. This study proves the applicability of the continuous flow hydrothermal methodology for the precise synthesis of various ultrasmall metal oxide nanoparticles, while providing deeper understanding of the unconventional fusion growth mechanism of ultrasmall metal oxides.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106618"},"PeriodicalIF":3.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878887","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}

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Formation of layered cell structure in silicone rubber foam via supercritical CO2-induced crosslinking 超临界co2诱导交联在硅橡胶泡沫中形成层状细胞结构

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-01 DOI: 10.1016/j.supflu.2025.106614

Zuoze Fan, Bo Wang, Lei Zhang, Ruyun Xu, Guangxian Li, Xia Liao

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Dissolution behavior of different additives and lubricating oil blends in liquid and supercritical CO2 不同添加剂和润滑油混合物在液体和超临界CO2中的溶解行为

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-01 DOI: 10.1016/j.supflu.2025.106615

Nathalie Piche, Stefan Pollak, Marcus Petermann

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Enhanced cyclic compression performance of polyolefin elastomer foams with novel open-cell structures through mixed gases regulation 通过混合气体调节提高新型开孔结构聚烯烃弹性体泡沫的循环压缩性能

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-01 DOI: 10.1016/j.supflu.2025.106617

Daoen Yu, Shaozhe Shi, Fangfang Zou, Bo Wang, Guangxian Li, Xia Liao

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Debittering Andean lupin beans via supercritical carbon dioxide extraction 用超临界二氧化碳萃取法去除安第斯罗苹豆的苦味

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-31 DOI: 10.1016/j.supflu.2025.106612

Miao Yu, Kai Kniepkamp, Beau Boonstra, Jan Pieter Thie, Rob J.F. van Haren

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Semi-continuous hydrothermal waste valorization: Facile protocol for monomer recovery from poly(bisphenol A carbonate) 半连续水热废物增值：从聚双酚A碳酸酯中回收单体的简易方案

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-29 DOI: 10.1016/j.supflu.2025.106610

János Béri , Mihály Hegyi , Blanka Tóth , Edit Székely

{"title":"Semi-continuous hydrothermal waste valorization: Facile protocol for monomer recovery from poly(bisphenol A carbonate)","authors":"János Béri , Mihály Hegyi , Blanka Tóth , Edit Székely","doi":"10.1016/j.supflu.2025.106610","DOIUrl":"10.1016/j.supflu.2025.106610","url":null,"abstract":"<div><div>This study introduces a novel semi-continuous hydrothermal process for the chemical recycling of poly(bisphenol A carbonate) (PC), focusing on the selective cleavage of bisphenol A (BPA) while minimizing its decomposition. Key operational parameters and reactor design were established through calculations using available kinetic and phase equilibrium data, ensuring that BPA residence time remained within acceptable limits. The design features continuous BPA removal to prevent secondary decomposition. Flow patterns of the system were analyzed using residence time distribution and mathematical deconvolution. At a temperature of 300 °C, pressure of 10 MPa, and a decomposition time of 70 min, the process achieved a 95 % yield of BPA within an average water residence time of approximately 1 minute. High purity of BPA was confirmed through chromatography, NMR spectroscopy, and thermal analysis. The results support a pseudo-solid kinetic behavior for PC hydrolysis, besides establishing a sustainable and efficient pathway for chemical recycling of PC.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106610"},"PeriodicalIF":3.4,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824242","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}

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Reevaluating CO2 solubility thresholds in PMMA nanocellular foam formation and its effect on cell structure 重新评估二氧化碳在PMMA纳米细胞泡沫形成中的溶解度阈值及其对细胞结构的影响

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-03-29 DOI: 10.1016/j.supflu.2025.106611

Kiday Fiseha Gebremedhin , Yu-Ting Ho , Solomon Dufera Tolcha, Nigus Maregu Demewoz, Shu-Kai Yeh

{"title":"Reevaluating CO2 solubility thresholds in PMMA nanocellular foam formation and its effect on cell structure","authors":"Kiday Fiseha Gebremedhin , Yu-Ting Ho , Solomon Dufera Tolcha, Nigus Maregu Demewoz, Shu-Kai Yeh","doi":"10.1016/j.supflu.2025.106611","DOIUrl":"10.1016/j.supflu.2025.106611","url":null,"abstract":"<div><div>Nanocellular foams have recently received much interest due to their fascinating properties. Previous studies have shown that molecular weight and CO<sub>2</sub> solubility are critical in obtaining nanocellular foams from commercial-grade polymers, with accepted wisdom requiring solubility exceeding 30 wt% for nanocellular PMMA generation. This study challenges this assumption by demonstrating successful production of nanocellular PMMA at significantly lower solubility under moderate saturation conditions (13.79 MPa and 20 °C). Experiments with reagent-grade PMMA of 136 kg/mol weight-average molecular weight produced nanocellular PMMA with an average cell size of 140 nm and cell density of 1.72 × 10<sup>15</sup> cells/cm<sup>3</sup> at CO<sub>2</sub> solubility of 25.89 wt%. Various prediction models for glass transition temperature of CO<sub>2</sub>-saturated PMMAs exhibited different accuracies between reagent-grade versus commercial-grade PMMAs. The relative density reached minimum values at foaming-saturation temperature difference of 60 °C to 80 °C. Increasing foaming temperature decreased solid skin thickness, while higher saturation temperature increased transition layer thickness.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"222 ","pages":"Article 106611"},"PeriodicalIF":3.4,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792800","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}

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