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71.
In this paper, poly(amide-6-b-ethylene oxide) (Pebax1657)/SAPO-34 mixed matrix membranes (MMMs) were prepared by solvent-evaporation method with acetic acid as a novel solvent. CO2, N2, CH4 and H2 permeation properties were investigated, and the physical properties of Pebax/SAPO-34 MMMs were characterized by XRD and SEM. At low SAPO-34 content, it was homogeneously distributed in the Pebax ma- trix, and then precipitated and agglomerated at high SAPO-34 content. The crystallinity of Pebax phase in Pebax/SAPO-34 MMMs decreased initially and then rebounded as a result of phase separation. With the increase of transmembrane pressure difference, CO2 permeability was en- hanced due to the effect of pressure-induced plasticization. Owing to the happening of stratification, the CO2 permeability of Pebax/SAPO-34 MMMs (50 wt% SAPO-34) increased to 338 Barrer from 111 Barrer of pristine Pebax, while the selectivities of CO2/CH4 and CO2/N2 were almost unchanged. Compared with the pristine Pebax, the gas separation performances of Pebax/SAPO-34 MMMs were remarkably enhanced. 相似文献
72.
Atif Ali Fan Cheng Wei-Hong Wen Xiao Ying Jaipal Kandhadi Hui Wang Hai-Yang Liu Chi-Kwong Chang 《中国化学快报》2018,29(12):1888-1892
A new bulky 2-chloro-5,10,15-tris(2,4,6-triphenylphenyl)-corrole was casually synthesized and the effect of mono-β-chlorination on its photophysical, electrochemical properties and light-induced singlet oxygen generation was investigated. 相似文献
73.
<正>A novel polyester containing ferrocenyl was prepared by low-temperature interface polycondensation of 1,1'-ferrocenedicarboxylic acid chloride with 4-(4-hydroxyphenyl)-2,3-phthalazin-1-one(DHPZ),which is a twisted non-coplanar heterocyclic bisphenol-like monomer.The newly generated polymer was evaluated based on characterization of its solubility,viscosity measurements,elemental analysis,FTIR spectroscopy,differential scanning calorimetric and thermogravimetric studies. 相似文献
74.
合成CFC-12替代物HFC-134a的CrF_3/AlF_3催化剂研究(Ⅴ)──CrF_3与AlF_3的相互作用 总被引:1,自引:0,他引:1
由于氟氯烃(CFCs)对大气臭氧层的破坏作用,使得开发CFCs无污染替代品的研究成为热门课题[1~4].氢氟烃(HFCs,如HFC-134a)是CFCs的理想替代物.在氟氯交换合成HFC-134a的反应中,AlF3基催化剂的活性、稳定性明显优于CrF... 相似文献
75.
MENG Fanbo CHEN Bo LIU Guang DING Jianying & MA Hui . Department of Physics Key Laboratory of Atomic Molecular Nano Sciences Ministry of Educa- tion Tsinghua University Beijing China . Graduate School at Shenzhen Tsinghua University Shenzhen China 《中国科学G辑(英文版)》2005,48(3):336-344
Fluorescence fluctuation spectroscopy (FFS)[1,2] is a kind of fluorescence detection techniques suitable for monitoring interaction and transportation processes in a small detection zone of biological systems. FFS detects and analyzes the fluorescence signal of the fluorescent molecules in the detection zone to retrieve the dynamical parameters of the system including concentration, diffusion coefficient and interaction constants. FFS utilizes various statistical methods to analyze the data,… 相似文献
76.
自动聚焦是数码设备、计算机视觉中的一项关键技术。自动聚焦过程中,聚焦的准确性和抗噪声性能至关重要。以高频分量作为度量的聚集评价函数具有灵敏性高、聚焦准确的优点,适用于实时系统,但是对噪声十分敏感,受噪声污染时可能导致聚焦失败。因此,提出了一种具有噪声稳健性的高频分量自动聚焦评价函数。该函数通过小波多分辨力分析提取高频分量,利用了信号的每个子带的小波系数存在一定相关性,而噪声不存在这样的相关性的特点,设定高频子带阈值,认为低于阈值的系数是噪声的贡献,大致分离图像信号与噪声信号,从而将其滤除。经过大量的实验,证明提出的方法具有单峰性好、灵敏度高等优点,特别是在抗噪声性能方面有很大提高。 相似文献
77.
Tao Wang Yi Hua Zhang Hui Ji Yan Ping Chen Si Xun Peng 《中国化学快报》2008,19(1):26-28
Novel phthalimide derivatives (4a, 4b and 6a-6e) were designed as hybrids of thalidomide and NO-ASA, and their chemical synthesis and in vitro biological activities were presented. The preliminary results showed that compared to thalidomide 4a and 4b exhibited enhanced activities against ECV304 and HepG2 cells, whereas 6e was more potent against HepG2 cells. 2007 Yi Hua Zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved. 相似文献
78.
The effect of an adsorbed anionic surfactant sodium dodecyl benzene sulfonate(SDBS) on electron transfer(ET) reaction between ferricyanide aqueous solution and decamethylferrocene(DMFc) located on the adjacent organic phase was investigated for the first time by thin layer method.The adsorption of SDBS at the interface resulted in a decay in the cathodic plateau current of bimolecular reaction with increasing concentrations of SDBS in aqueous phase.However,the rate constant of electron transfer(k_(et)) i... 相似文献
79.
SinceKaminskyeIal.discoveredthehighlyactivezirconocenedich1oride/methyl-aluminoxane(MAO)catalyticsystemforolefinpolymerization',intensiveresearchworkhasbeenfocusedondevelopingnewgroup4metal1ocenecatalystsforimprovingcatalystactivitiesandpolymerproperties"'.Inthedevelopmentofnewmetallocenecatalystsystems,liganddesignandmodificationhaveplayedanimportantrole.lthasbeenknownthatevenminormodificationofagivenligandframeworkcouldresultinsignificantchangesincatalystactivitiesandpolymerproperties'.Int… 相似文献
80.
van der Rest G Hui R Frison G Chamot-Rooke J 《Journal of the American Society for Mass Spectrometry》2011,22(9):1631-1644
Electron capture dissociation (ECD) of a series of five residue peptides led to the observation that these small peptides
did not lead to the formation of the usual c/z ECD fragments, but to a, b, y, and w fragments. In order to determine how general this behavior is for small sized peptides, the effect of peptide size on ECD
fragments using a complete set of ECD spectra from the SwedECD spectra database was examined. Analysis of the database shows
that b and w fragments are favored for small peptide sizes and that average fragment size shows a linear relationship to parent peptide
size for most fragment types. From these data, it appears that most of the w fragments are not secondary fragments of the major z ions, in sharp contrast with the proposed mechanism leading to these ions. These data also show that c fragment distributions depend strongly on the nature of C-terminal residue basic site: arginine leads to loss of short neutral
fragments, whereas lysine leads to loss of longer neutral fragments. It also appears that b ions might be produced by two different mechanisms depending on the parent peptide size. A model for the fragmentation pathways
in competition is proposed. These relationships between average fragment size and parent peptide size could be further exploited
also for CID fragment spectra and could be included in fragmentation prediction algorithms. 相似文献