APPLIED THERMAL ENGINEERING
·
2017
·
IF 3.444
Xue-Feng Shao,Song-Ping Mo,Ying Chen,Tao Yin,Zhi Yang,Li-Si Jia,Zheng-Dong Cheng
The solidification behavior of hybrid nanofluids containing TiO 2 nanotubes (TiNTs) and nanoplatelets (TiNPs) was investigated in 10 freeze–melt cycles and the results were compared with those of individual TiNT and TiNP nanofluids. Hybrid TiO 2 nanofluids showed lower supercooling degrees because of larger surface area exposed to water, and shorter freezing time as a result of higher thermal conductivities, compared with individual TiNT and TiNP nanofluids. A maximum reduction of 5.27 ± 0.2 °C in supercooling degree and 56.42% in freezing time were achieved for hybrid nanofluids containing 25% and 50% TiNPs, respectively. The supercooling degree and freezing time of hybrid nanofluids showed less of an increase across 10 freeze–melt cycles as they have better dispersion stability compared with individual nanofluids. Evidently, the smallest increase of 0.68 ± 0.2 °C in supercooling degree and 29.85% in freezing time was achieved in 0.1 wt.% hybrid nanofluid compared with 2.02 ± 0.2 °C and 130.37% for individual TiNT nanofluids and 3.98 ± 0.2 °C and 101.08% for individual TiNP nanofluids. These promising performances highlight the outstanding thermal energy storage applications of hybrid nanofluids.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Liyan Jia,Xin Huang,Wenfei Zhao,Huihui Wang,Xu Jing
In this study, a simple, efficient, and green effervescence tablet-assisted microextraction method based on the solidification of deep eutectic solvent (ETA-ME-SDES) was developed to determine picoxystrobin, pyraclostrobin, and trifloxystrobin in water, juice, wine, and vinegar samples by HPLC. An eco-friendly, hydrophobic, deep eutectic solvent (DES, acting as the extraction solvent) was synthesized by thymol and octanoic acid in the molar ratio of 1:5. The extraction solvent dispersed in sample solutions with the assistance of pH adjustment and effervescence reaction, and was collected after solidification in an ice bath. Several essential conditions, including the type and the volume of DESs, the amount of ammonia hydroxide, and the components of effervescence tablets were optimized. The limits of detection ranged from 0.15 to 0.38 μg L −1 . Extraction recovery ranged from 77.4 to 106.9%. The proposed method was successful in determining the amount of strobilurin fungicides in water, juice, wine, and vinegar samples.
研究领域:
分析化学
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环境科学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 43
·36223-36230
·
IF 3.289
Lu Hu,Wanyu Shan,Ying Zhang,Songqing Li,Haixiang Gao,Runhua Lu,Sanbing Zhang,Wenfeng Zhou
A novel liquid phase microextraction method based on the solidification of floated ionic liquids (SFIL-LPME) was developed to determine four phthalate esters (diethyl phthalate, diallyl phthalate, benzyl butyl phthalate, and dicyclohexyl phthalate) in environmental waters and bottle beverages and subsequently separate them using high-performance liquid chromatography. In this work, we customized a tributyldodecylphosphonium tetrafluoroborate ([P4 4 4 12][BF4]) ionic liquid (IL) to obtain a low density such that it can be solidified at a low temperature, and then used as an extraction solvent in liquid-phase microextraction based on the solidification of floated organic drops (SFO-LPME). This means that more potential ILs can be customized to broaden extraction solvents in SFO-LPME. To identify the significant factors that affect extraction efficiency, parameters such as the volume of [P4 4 4 12][BF4], the extraction time, the rotation speed, the extraction temperature and the ionic strength were optimized using a Plackett–Burman design. A central composite design was then used to optimize the identified significant factors to study the effect of interactions on the experiment. Under these optimized conditions, the extraction recoveries of the four phthalate esters in water samples ranged from 73.0 to 94.6% and in bottled beverage were from 70.2 to 101.3%, with relative standard deviations (RSDs) ranging from 0.6 to 8.2% and 0.6 to 7.8%. Good linearity for both water samples and bottled beverages were obtained in the range of 5–500 μg L−1, with correlation coefficients greater than 0.9993. The limits of detection for the four phthalate esters varied from 0.27 to 1.1 μg L−1 for water samples and 1.22 to 2.36 μg L−1 for bottled beverages. The two developed methods were then successfully applied to the determination of phthalate esters in environmental waters and bottled beverages.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2013
·Vol. 180
·期 5
·341-346
·
IF 3.434
Hou Fang,Deng Ting,Jiang Xinyu
We have developed a simple and efficient method for dispersive liquid-liquid microextraction of 4-nitrophenol, 2-naphthol and bisphenol A in real water samples. It is making use of solidified floating organic droplets of 1-dodecanol which has low density and a proper melting point. The type and volume of extraction solvent and dispersive solvent, the effect of salts, pH value and extraction time were optimized and resulted in enrichment factors of 84 for 4-nitrophenol, 123 for 2-naphthol, and 97 for bisphenol A. The limits of detection by HPLC are 1.50, 0.10 and 1.02 ng · mL −1 , respectively. Excellent linearity is observed in the concentration range from 10 to 800 ng · mL −1 , with coefficients of correlation ranging from 0.9988 to 0.9999. The relative standard deviations (for n = 5) are from 3.2 to 5.3 %, and relative recoveries for the three phenols in tap, river and spring water range from 85.0 to 105.0 %, 98.3 to 110.0 %, and 98.6 to 109.0 %, respectively.
Chromatograms of river water blank (b) and spiked river water (a, 500 ng ∙ mL −1 ) analyzed with DLLME-SFO-HPLC. Peak identification: (1) p-nitrophenol; (2) 2-naphthol; (3) bisphenol A. Liquid-liquid microextraction method based on solidification of floating organic droplet (DLLME-SFO) has a high enrichment factor (84, 123and 97), acceptable relative recovery (85.0 %–110.0 %), good repeatability (5.27 %, 3.54 % and 3.16 %) and a wide linear range (10–800 ng · mL −1 ) for the determination of p-nitrophenol, 2-naphthol and bisphenol A.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Separations
·
2022
·Vol. 10
·期 1
·1
·
IF 3.344
Xian Zhang,Luyun Zhang,Dan Zheng,Zhenzhen Xia,Maomin Peng,Danling Sun,Xizhou Hu,Xitian Peng
In the current study, an effective and simple procedure of extraction for the four benzophenone compounds from water samples was achieved by dispersive liquid–liquid microextraction (DLLME) based on the solidification of floating organic droplets (SFO) with a natural monoterpene enol as the extractant. As a natural, high solidification point, inexpensive, and environmentally friendly hydrophobic solvent, α−terpineol was selected firstly as an extractant for DLLME and could be collected and transferred easily after extraction by solidification at a lower temperature. Several main parameters closely related to extraction efficiencies, such as volume of extractant, extraction time, pH and salt concentration of the sample solution, temperature, and time of the solidification process, were investigated in detail. The results showed that the established method had good extraction performance for benzophenone compounds with enrichment factors in the range of 29–47. Furthermore, the linearities were over the range of 2–2000 µg/L, and the limits of detection were 0.12–0.53 µg/L for four benzophenone compounds. The recoveries ranged from 80.2% to 108.4%, with RSDs (intra- and inter-assay) less than 8.5%. At last, the method applicability was investigated by the determination of the benzophenone compounds in aqueous solutions, and satisfactory recoveries (83.0–107.0%) were acquired. Taken together, α−terpineol, a natural monoterpene enol, was first used as an extractant of DLLME-SFO, which provided an alternative method with simplicity and rapidity for the determination of benzophenone compounds in aqueous samples.Keywords:α−terpineol;dispersive liquid–liquid microextraction (DLLME);solidification of floating organic droplet (SFO);benzophenone compounds
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Qiao Feng Wang,Ming Sun,Jiang Bing Sun,Jun Zhou
A novel and efficient method of surfactant-assisted temperature-controlled solidification ionic liquid dispersion liquid–liquid microextraction (SA-TCS-IL-DLLME) has been developed for the preconcentration and determination of trace five phthalate esters in bottled water. The analysis was completed by ultra-high performance liquid chromatography (UHPLC). In this study, hydrophobic low-density solid quaternary phosphonate ionic liquid ([P 44412 ] BF 4 ) was used as extractant while surfactant Tergitol TMN-6 was employed as dispersant. The dispersion of the extractant in the sample solution was promoted by water bath and vortex. At the same time, the temperature was controlled to transform the extractant from liquid to solid. Then, the separation of the extractant and the sample solution was achieved. Incidentally, extraction of the analyte was also finished. Important parameters which affected SA-TCS-IL-DLLME efficiency, such as the type and volume of extractant and dispersant, the amount of salt, the vortex time and pH value were investigated and optimized by single factor experiments. Under these optimized conditions, the method exhibited linearity ranges of 0.01–1.0 ng mL −1 with correlation coefficients between 0.9994 and 0.9998. The method’s intra-day ( n = 6) and inter-day ( n = 6) precision levels were maintained at ≤ 3.37 %, which was considered to be within acceptable limits. The computed detection and quantification limits were 16.54–24.60 and 54.91–82.04 ng mL −1 , respectively. Above all, this optimized method was effectively employed to extract five phthalate esters from bottled water with recoveries ranging from 94.83 % to 98.72 %. It can be used for rapid analysis and detection of phthalate esters in bottled water samples.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2016
·Vol. 9
·期 10
·1118-1124
·
IF 7.116
Xuefeng Liu,Zipeng Xing,Hang Zhang,Wenmei Wang,Yan Zhang,Zhenzi Li,Xiaoyan Wu,Xiujuan Yu,Wei Zhou
Graphical Pass the Mo : A 3 D sandwich of mesoporous black TiO 2 (MBT)/MoS 2 /MBT was fabricated using a facile mechanochemistry method combined with an in situ solid-state chemical reduction approach. The material exhibited excellent visible-light-driven photocatalytic performance for pollutant degradation and hydrogen evolution owing to the sandwich-like heterojunction structure and Ti 3+ doping. A novel 3 D mesoporous black TiO 2 (MBT)/MoS 2 /MBT sandwich-like nanosheet was successfully fabricated using a facile mechanochemical process combined with an in situ solid-state chemical reduction approach, followed by mild calcination (350 °C) under an argon atmosphere. The MBT/MoS 2 /MBT exhibits a 3 D sandwich-like nanosheet structure and heterojunctions are formed at the interfaces between MoS 2 and black TiO 2 . The significantly narrowed band gap of MBT/MoS 2 /MBT is attributed to the introduction of MoS 2 and the formed Ti 3+ species in the frameworks. The visible-light photocatalytic degradation rate of methyl orange and the hydrogen production rate are as high as 89.86 % and 0.56 mmol h −1 g −1 , respectively. The introduction of MoS 2 and Ti 3+ in the frameworks favors the visible-light absorption and the separation of photogenerated charges, and the 3 D sandwich-like heterojunction structure facilitates the transfer of photogenerated charges.
研究领域:
材料科学
·
化学
·
环境科学
·
能源科学
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产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 18
·2105924
·
IF 17.521
Bing-Qing Xiong,Shunqiang Chen,Xuan Luo,Qingshun Nian,Xiaowen Zhan,Chengwei Wang,Xiaodi Ren
Solid-state electrolytes (SSEs) hold a critical role in enabling high-energy-density and safe rechargeable batteries with Li metal anode. Unfortunately, nonuniform lithium deposition and dendrite penetration due to poor interfacial solid–solid contact are hindering their practical applications. Here, solid-state lithium naphthalenide (Li-Naph(s)) is introduced as a plastic monolithic mixed-conducting interlayer (PMMCI) between the garnet electrolyte and the Li anode via a facile cold process. The thin PMMCI shows a well-ordered layered crystalline structure with excellent mixed-conducting capability for both Li + (4.38 × 10 –3 S cm –1 ) and delocalized electrons (1.01 × 10 –3 S cm –1 ). In contrast to previous composite interlayers, this monolithic material enables an intrinsically homogenous electric field and Li + transport at the Li/garnet interface, thus significantly reducing the interfacial resistance and achieving uniform and dendrite-free Li anode plating/stripping. As a result, Li symmetric cells with the PMMCI-modified garnet electrolyte show highly stable cycling for 1200 h at 0.2 mA cm –2 and 500 h at a high current density of 1 mA cm –2 . The findings provide a new interface design strategy for solid-state batteries using monolithic mixed-conducting interlayers.
研究领域:
材料科学
·
电化学
·
储能技术
·
固态离子学
·
电池技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Xu Yan,Zipeng Xing,Yan Cao,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Qi Zhu,Shilin Yang,Wei Zhou
In-situ C-N-S-tridoped single crystal black TiO 2 nanosheets with exposed {001} facets are successfully fabricated via a facile hydrothermal method combined with an in-situ solid-state chemical reduction approach, followed by calcination at 450 °C. The crystal structure, crystallinity, morphology and composition of the as-prepared samples are investigated through X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy, respectively. The results suggest that the obtained C-N-S-tridoped single crystal black TiO 2 nanosheets exhibit uniform nanosheet-like structure with exposed {001} facets and average length of ∼300–400 nm, thickness of ∼20 nm. The visible-light photocatalytic degradation rate of methyl orange is up to 92.13%, and photocatalytic hydrogen evolution is 149.7 μmol h −1 g −1 . The excellent photocatalytic activity can be ascribed to the synergetic effect of surface heterojunction between {001} and {101} facets, the C-N-S-tridoping, and the formed Ti 3+ species in photocatalyst, which can not only favor the visible-light absorption but also facilitate the separation and transfer of photogenerated charges.
研究领域:
材料科学
·
化学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）