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Preparation and characteristics of nano-crystalline Cu-Ce-Zr-O composite oxides via a green route: supercritical anti-solvent process 被引量:8
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作者 况丽 黄盼 +2 位作者 孙焕花 姜浩锡 张敏华 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第2期137-144,共8页
The nano-crystalline Cu-Ce-Zr-O composite oxides were successfully prepared by the supercritical anti-solvent (SAS) process. The physicochemical properties and catalytic performances were investigated by X-ray diffr... The nano-crystalline Cu-Ce-Zr-O composite oxides were successfully prepared by the supercritical anti-solvent (SAS) process. The physicochemical properties and catalytic performances were investigated by X-ray diffraction (XRD), Raman spectroscopy, H2 temperature-programmed reduction (H2 -TPR), oxygen storage capacity (OSC) measurement and catalytic activity evaluation. It was found that Cu2+ ions incorporated into CeO2 -ZrO2 lattice to form Cu-Ce-Zr-O solid solution associated with the formation of oxygen vacancies. The Cu-Ce-Zr-O catalysts prepared via the SAS process with the Cu content 2.63 mol.% showed the highest OSC index of 636.9 μmol/g. Compared with the samples prepared by impregnation method, Cu doping using SAS process could improve the dispersion of Cu2+ in the composite oxide, enhance the interaction between Cu2+ and CeO2-ZrO2 , improve the reducibility of catalyst, and thus improve the OSC performance and increase the catalytic activity for CO oxidation at low temperature. 展开更多
关键词 CO oxidation supercritical anti-solvent (SAS) process Cu-Ce-Zr-O composite oxides oxygen storage capacity threeway catalysts rare earths
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超临界反溶剂过程制备灰黄霉素超细微粒 被引量:4
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作者 李志义 李文秀 +2 位作者 刘学武 孟庭宇 夏远景 《化学反应工程与工艺》 EI CAS CSCD 北大核心 2006年第2期156-161,共6页
超临界反溶剂过程(SAS)是近年来提出的一种制备纳微米粉体的新方法。通过一套超临界反溶剂过程间歇式实验装置,以灰黄霉素、丙酮和二氧化碳系统为研究对象,实验研究了SAS过程参数对制备的微粒形态及其尺寸的影响。当操作条件为10 MPa,40... 超临界反溶剂过程(SAS)是近年来提出的一种制备纳微米粉体的新方法。通过一套超临界反溶剂过程间歇式实验装置,以灰黄霉素、丙酮和二氧化碳系统为研究对象,实验研究了SAS过程参数对制备的微粒形态及其尺寸的影响。当操作条件为10 MPa,40℃,溶液浓度13.3 mg/mL和溶液流速1.5 mL/min时,制备了较为理想的灰黄霉素微粒,粒径分布均匀、形状基本呈球状;当8 MPa,42℃,溶液浓度15 mg/mL和溶液流速4.0 mL/min时,微粒粒径分布比较均一、主要呈细小针状。研究结果表明:采用丙酮作为有机溶剂,可制备出不同大小和形态的灰黄霉素超细微粒。这为改变灰黄霉素传统制剂做了前期准备工作,为制成可持缓释药物提供了可能性。 展开更多
关键词 超临界反溶剂过程 超细微粒 灰黄霉素
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Anti-solvent assisted treatment for improved morphology and efficiency of lead acetate derived perovskite solar cells 被引量:1
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作者 Mengqin Kong Hang Hu +3 位作者 Kingsley Egbo Binghai Dong Li Wan Shimin Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2019年第6期1325-1328,共4页
An efficient solution-processable route employing Pb(Ac)2 as lead source and anti-solvent treatment to achieve fully covered and homogenous perovskite films is reported. The effect of different solution methods and de... An efficient solution-processable route employing Pb(Ac)2 as lead source and anti-solvent treatment to achieve fully covered and homogenous perovskite films is reported. The effect of different solution methods and device architectures on the morphologies of perovskite films were systematically investigated. Our results show that the planar perovskite layer fabricated by one-step solution method achieved fully covered and pinhole-free films. Further anti-solvent treatment using chlorobenzene (CB) promoted a perovskite film with highly smooth surfaces and enlarged grain sizes. Device fabricated from CB treated perovskite film achieved a best PCE of 15.80%, in comparison with 14.02%for the untreated device. These results evidently suggest a feasible route towards controlling the crystallization and morphology of planar heterojunction (PHJ) PSCs for improved efficiency. 展开更多
关键词 Lead acetate DERIVED PEROVSKITE anti-solvent process CHLOROBENZENE IMPROVED MORPHOLOGY Enlarged grain sizes
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Protein microspheres for pulmonary drug delivery
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作者 Yongda SUN 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2010年第1期82-86,共5页
A new supercritical fluid(SCF)technique was developed for the preparation of microspheres for pulmonary drug delivery(PDD).This technique,based on the anti-solvent process,has incorporated advanced engineering design ... A new supercritical fluid(SCF)technique was developed for the preparation of microspheres for pulmonary drug delivery(PDD).This technique,based on the anti-solvent process,has incorporated advanced engineering design features to enable improved control of the particle formation process.Human recombinant insulin(HRI)was used as a model compound to evaluate the efficiency of this SCF process.An aqueous solution of HRI with a co-solvent was sprayed into high pressure carbon dioxide that extracted the solvent and water,leading to a dry fine powder with good particle size distribution and near ideal morphology for pulmonary drug delivery. 展开更多
关键词 supercritical fluid anti-solvent process pulmonary drug delivery protein microsphere human recombinant insulin
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