Journal of Supercritical Fluids最新文献_第6页

Modelling and optimization of supercritical CO2 drying of tuna (Thunnus albacares) fillets: Unraveling physicochemical and structural changes 金枪鱼鱼片超临界CO2干燥的建模和优化：揭示理化和结构变化

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Journal of Supercritical Fluids Pub Date : 2025-04-16 DOI: 10.1016/j.supflu.2025.106621

Yago A.A. Bernardo , Riccardo Zulli , Pietro Andrigo , Fabio Santi , Denes K.A. Do Rosario , Alessandro Zambon , Sara Spilimbergo , Carlos A. Conte-Junior

{"title":"Modelling and optimization of supercritical CO2 drying of tuna (Thunnus albacares) fillets: Unraveling physicochemical and structural changes","authors":"Yago A.A. Bernardo , Riccardo Zulli , Pietro Andrigo , Fabio Santi , Denes K.A. Do Rosario , Alessandro Zambon , Sara Spilimbergo , Carlos A. Conte-Junior","doi":"10.1016/j.supflu.2025.106621","DOIUrl":"10.1016/j.supflu.2025.106621","url":null,"abstract":"<div><div>This study explores and optimises the innovative supercritical carbon dioxide (SC-CO<sub>2</sub>) drying process for tuna fillets (<em>Thunnnus albacares</em>), offering a sustainable alternative for food preservation. Using a central composite rotatable design (CCRD), we assessed the effect of drying time (120–360 min), temperature (35–45°C), and flow rate (15–25 kg/h) at 10 MPa on key quality attributes: moisture content, water activity (a<sub>w</sub>), rehydration capacity (RC), pH, and total colour difference (ΔE). Our findings indicated that drying time and CO<sub>2</sub> flow rate are the main factors affecting the water content. Drying time and flow rate significantly reduced moisture content and a<sub>w</sub>, while RC improved with prolonged time and higher flow rates. Despite increases in pH (from 6.01 to 6.405) and ΔE (23.51) due to the treatment, these changes did not compromise the product’s overall quality. Optimal drying parameters were determined as 377.2 min, 39.7 °C, and 27.3 kg/h, with subsequent confirmatory experiments using three different conditions validating the moisture model. However, spectroscopy and microscopy analyses indicated potential lipid and protein oxidation related to the CO<sub>2</sub> flow rate, highlighting avenues for future research to refine this promising drying technique.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106621"},"PeriodicalIF":3.4,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867910","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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Analysis of flow process of CO2 in wellbore and prediction of fracture initiation pressure during SC-CO2 fracturing SC-CO2压裂井筒中CO2流动过程分析及起裂压力预测

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Journal of Supercritical Fluids Pub Date : 2025-04-15 DOI: 10.1016/j.supflu.2025.106632

Hao Chen , Jie Tu , Can Cai , Liehui Zhang , Man Huang , Xianpeng Yang , Xiaohong Yuan

{"title":"Analysis of flow process of CO2 in wellbore and prediction of fracture initiation pressure during SC-CO2 fracturing","authors":"Hao Chen , Jie Tu , Can Cai , Liehui Zhang , Man Huang , Xianpeng Yang , Xiaohong Yuan","doi":"10.1016/j.supflu.2025.106632","DOIUrl":"10.1016/j.supflu.2025.106632","url":null,"abstract":"<div><div>Numerical simulation of the behavior of supercritical CO<sub>2</sub> during the entire fracturing operations is performed to investigate the pressurization features and flow characteristics before and after rock breakdown. To achieve these goals, a numerical model coupling fluid convective heat transfer and conduction heat from the formation is developed. Results indicate that the accumulation of CO<sub>2</sub> density can slow the growth of frictional pressure drop to promote pressurization, and that a higher injection temperature is not conducive to pressurization. After the rock breakdown, the injection temperature is above 263.15 K, and the CO<sub>2</sub> at the bottomhole can maintain a supercritical phase. The change of bottomhole pressure has no significant effect on the variation of CO<sub>2</sub> temperature. A higher bottomhole temperature can elevate the rock fracture initiation pressure, and in-situ stress difference <em>σ</em><sub>H</sub>/<em>σ</em><sub>h</sub> increases from 1 to 3, with a 93 % decrease in initiation pressure due to increased temperature.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106632"},"PeriodicalIF":3.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143885949","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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Lignin valorization in biorefineries: A techno-economic analysis of a novel process for biolubricant production from lignin and waste cooking oil 木质素在生物炼制中的增值：利用木质素和废食用油生产生物润滑剂新工艺的技术经济分析

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-14 DOI: 10.1016/j.supflu.2025.106631

Elena Barbera , Andrea Guarise , Alberto Bertucco , Randy L. Maglinao , Sandeep Kumar

{"title":"Lignin valorization in biorefineries: A techno-economic analysis of a novel process for biolubricant production from lignin and waste cooking oil","authors":"Elena Barbera , Andrea Guarise , Alberto Bertucco , Randy L. Maglinao , Sandeep Kumar","doi":"10.1016/j.supflu.2025.106631","DOIUrl":"10.1016/j.supflu.2025.106631","url":null,"abstract":"<div><div>This work aims at preliminary evaluating the techno-economic feasibility of a biolubricant production process starting from lignin and waste cooking oil, to be integrated in a lignocellulosic biorefinery. A phenyl-branched FAMEs mixture is obtained, which exhibit improved lubricity and oxidative stability compared to standard FAMEs-based biolubricants. The product is obtained exploiting aromatic hydrocarbons from lignin, generated via hydrothermal liquefaction followed by selective hydrodeoxygenation. The economic analysis compares the minimum ethanol selling price (MESP) of a generic U.S. biorefinery processing 2000 tonne/day of corn stover with and without the integration of biolubricant production. Results indicate potential improvement in the biorefinery economic performance, with MESP decreasing from $0.798/L in the reference case (ethanol production only) to $0.697/L when the biolubricant process is included. Reduction in the price of waste cooking oil improves the performances, although the biolubricant selling price has a large impact on the economic profitability of the process.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106631"},"PeriodicalIF":3.4,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834806","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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Corrigendum to “Supercritical fluid remediation for soil contaminants: Mechanisms, parameter optimization and pilot systems” [J. Supercrit. Fluids 189 (2022) 105718] “超临界流体修复土壤污染物：机制、参数优化和试点系统”[J]。Supercrit。流体189 (2022)105718]

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-10 DOI: 10.1016/j.supflu.2025.106619

Lin Chen , Jahongir Hasanov , Jiaxiang Chen , Yongchang Feng , Yuki Kanda , Atsuki Komiya

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Theoretical understanding of pharmaceutics solubility in supercritical CO2: Thermodynamic modeling and machine learning study 超临界CO2中药物溶解度的理论认识：热力学建模和机器学习研究

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-05 DOI: 10.1016/j.supflu.2025.106605

Lishen He , Chen Zhang , Ke Hu , Yutong Zhu

{"title":"Theoretical understanding of pharmaceutics solubility in supercritical CO2: Thermodynamic modeling and machine learning study","authors":"Lishen He , Chen Zhang , Ke Hu , Yutong Zhu","doi":"10.1016/j.supflu.2025.106605","DOIUrl":"10.1016/j.supflu.2025.106605","url":null,"abstract":"<div><div>Both experimental and theoretical studies of drug solubility in supercritical CO<sub>2</sub> are essential for optimizing supercritical techniques in pharmaceutical formulation. This study explores the solubility of Chlorothiazide and Chloroquine, two drugs with low solubility and bioavailability, in supercritical CO₂ using various theoretical models, including empirical models, a non-cubic equation of state (PC-SAFT), a recently developed expanded liquid model proposed by Sodeifian, the regular solution model, and artificial neural network method (ANN). The reliability of these models in predicting and analyzing the solubility of the desired drugs in supercritical CO<sub>2</sub> is validated by comparing their results with experimental data previously recorded at temperatures between 308 K to 338 K and pressures ranging from 130 bar to 290 bar for Chlorothiazide and 120 bar to 400 bar for Chloroquine. The study found that all empirical and thermodynamic models provided satisfactory accuracy in correlating the solubility of both drugs, with <em>AARD</em> values below 10 %. For Chlorothiazide, the most accurate models were the empirical models (<em>AARD</em>%= 1.78–2.72), followed by PC-SAFT (<em>AARD</em>% = 5.23), the Sodeifian model (<em>AARD</em>% = 8.257), and the regular solution model (<em>AARD</em>% = 9.77–10.9). For Chloroquine, the ranking was slightly different, with PC-SAFT (<em>AARD</em>% = 4.15) performing the best, followed by the empirical models (<em>AARD</em>% = 7.1–8.3), the Sodeifian model (<em>AARD</em>% = 7.94), and the regular solution model (<em>AARD</em>% = 8.03–9.74). Moreover, the ANN-based multilayer perceptron (MLP), trained using Bayesian Regularization and Levenberg-Marquardt backpropagation, achieved exceptional accuracy, with over 99 % of predictions closely matching the experimental solubility data in supercritical CO<sub>2</sub>.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106605"},"PeriodicalIF":3.4,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838412","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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Rapid extraction of xanthohumol, α- and β-acids from spent hops using pressurized liquids and supercritical fluids 利用加压液体和超临界流体快速提取酒花中黄腐酚、α-酸和β-酸

IF 3.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-04-05 DOI: 10.1016/j.supflu.2025.106609

Amanda Mellissa Bezerra Oliveira , Aureliano Agostinho Dias Meirelles , Francisco Manuel Barrales , Arthur Luiz Baião Dias , Luiz Henrique Fasolin , Juliane Viganó , Julian Martínez

{"title":"Rapid extraction of xanthohumol, α- and β-acids from spent hops using pressurized liquids and supercritical fluids","authors":"Amanda Mellissa Bezerra Oliveira , Aureliano Agostinho Dias Meirelles , Francisco Manuel Barrales , Arthur Luiz Baião Dias , Luiz Henrique Fasolin , Juliane Viganó , Julian Martínez","doi":"10.1016/j.supflu.2025.106609","DOIUrl":"10.1016/j.supflu.2025.106609","url":null,"abstract":"<div><div>The recovery of bioactive compounds from spent hops from dry-hopping was obtained by pressurized liquid (PLE) and supercritical fluids (SFE) with cosolvent. PLE was performed at 10 MPa, with 50, 75, and 100 wt% ethanol in water at 70, 90, and 110 °C. SFE was performed using carbon dioxide with 10 wt% ethanol at 15, 25, and 35 MPa, and 40, 50, and 60 °C. The extracts were evaluated in terms of global yield, total reducing capacity (TRC), antioxidant capacity (ORAC), and content of target compounds. Temperature had little influence on the PLE results, except for α-acids, which were converted to iso-α-acids at 110 °C. The solvent composition impacted TRC, with 75 % ethanol being more efficient in extracting phenolic compounds (30.31 ± 2.86 mg GAE/g spent hops at 110 °C). The kinetics of PLE showed that most compounds are rapidly extracted in the first 6 min. In SFE, pressure was the most important factor, with 25 MPa and 60 °C being the most effective condition (36.21 ± 1.77 % global yield). Higher pressures and temperatures led to the co-extraction of undesired compounds, reducing α- and β-acid yields. The kinetics SFE curves exhibited a similar pattern to those of PLE, revealing that most compounds were quickly recovered in the first 6–7 min. Spent hops from dry-hopping are a promising source of xanthohumol and α- and β-acids, with high antioxidant capacity and potential applications in the food, cosmetic, and pharmaceutical industries.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"223 ","pages":"Article 106609"},"PeriodicalIF":3.4,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143816806","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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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}

引用次数: 0