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Design and Creation of Bioinspired Surfaces with Special Wettability

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Design and Creation of Bioinspired Surfaces with Special Wet...

2007年全国高分子学术论文报告会

作者： lei jiang center of molecular sciences,institute of chemistry,chinese academy of sciences,beijing 100080,china

＜正＞Bio-inspired smart materials should be a “live” material with various functions like organism in nature,they must have three essential elements as sense,drive and control. The putting forward of bio-inspired smart interfacial materials just bases on the above mentioned elements,while the design principle can be divided into five levels:（1）

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Super-hydrophobic Surfaces: From Natural to Artificial

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Super-hydrophobic Surfaces: From Natural to Artificial

2003年纳米和表面科学与技术全国会议

作者： lei jiang center of molecular sciences, institute of chemistry, chinese academy of sciences, beijing 100080, china

The wettability of solid surfaces is a very important property, and is governed by both the chemical composition and geometrical microstructure of the surface. The generation by UV illumination of a super-hydrophilic TiO2 surface with a contact angle (CA) for water of 0°has attracted significant attention. This material has already been successfully applied as a transparent super-hydrophilic coating with antifogging and self-cleaning properties. Currently, super-hydrophobic surfaces with water CA higher than 150°are arousing much interest because they will bring great convenience in daily life as well as in many industrial processes. Various phenomena, such as snow sticking, contamination or oxidation, and current conduction, are expected to be inhibited on such a surface.

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Super-hydrophobic Surfaces: From Natural to Artificial

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Super-hydrophobic Surfaces: From Natural to Artificial

2004年中国材料研讨会

作者： lei jiang (center of molecular sciences, institute of chemistry, chinese academy of sciences, beijing 100080, china

＜正＞The wettability of solid surfaces is a very important property, and is governed by both the chemical composition and geometrical microstructure of the surface. Currently, super-hydrophobic surfaces with water CA higher than 150°are arousing much interest because they will bring great convenience in daily life as well as in many industrial processes. Various phenomena, such as snow sticking, contamination or oxidation, and current conduction, are expected to be inhibited on such a surface. Conventionally, super-hydrophobic surfaces have been produced mainly in two ways. One is to create a rough structure on a hydrophobic surface, and the other is to modify a rough surface by materials with low surface free energy. While the water CA has commonly been used as a criterion for the evaluation of hydrophobicity of a solid surface, this alone is insufficient to assess the sliding properties of water droplets on the surface. A fully super-hydrophobic surface should exhibit both high CA and low sliding *** recent studies on lotus and rice leaves reveal that a super-hydrophobic surface with both a large CA

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HYDROPHOBICITY OF CONTAMINATED SILICONE RUBBER SURFACES

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chinese Journal of Polymer Science 2002年第6期20卷 559-564页

作者： Zhi-min Zheng Cai-hong Xu Jian jiang Chang-yu Ren Wei Gao Ze-min Xie center for molecular Science, institute of chemistry, chinese academy of sciences, beijing 100080, china center for molecular Science Institute of Chemistry Chinese Academy of Sciences 北京 100080

Silicone rubber (SIR) shows superior performance when used outdoors, but its surface can be transformed from inherently hydrophobic to hydrophilic by the adsorption of contaminants. Al(OH)(3), Al2O3, quartz powder and active carbon were selected as authentic contaminants. Hydrophobicity of the surface was determined using contact angle measurement. The results indicate that the adsorbability of the contaminants can strongly affect the hydrophobicity of contaminated SIR surface. The increasing rate of contact angle of specimens contaminated by Al(OH)(3) was much faster than that by Al2O3 and quartz due to the adsorption of migrated low molecular weight (LMW) polydimethylsiloxanes. Specimens contaminated by active carbon could achieve surface hydrophobicity within 15 min because active carbon has high adsorbability. Surfaces of contaminated ultrapure SIR, polytetrafluoroethylene (PTFE) and glass remain hydrophilic because they contain no mobile LMW components. The addition of oligomeric polydimethylsiloxanes has little effect on the hydrophobicity of contaminants covered on SIR surface.

关键词： hydrophobicity silicone rubber contact angle contamination

Controlled assembly of copper phthalocyanine with 1-iodooctadecane

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chinese Science Bulletin 2003年第15期48卷 1519-1524页

作者： lei Shengbin, WANG Chen, WAN Lijun & BAI Chunli center of molecular sciences, institute of chemistry, chinese academy of sciences, beijing 100080, china Correspondence should be addressed to Bai Chunli (e-mail: clbai@ ***) center of molecular sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

The binary assembly behavior of 1-iodoocta- decane with substituted phthalocyanine (Pc) is studied using the scanning tunneling microscopy (STM). By altering the substituted alkyl groups attached to the phthalocyanine ring, either uniform assembly or phase separation behavior can be observed. It is suggested that the strength of intermolecular interaction between phthalocyanine molecules is the determining factor for the assembly structure.

关键词：铜酞菁碘代十八烷扫描隧道电子显微镜化学结构

Applications of synchrotron-based X-ray techniques in environmental science

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Science china chemistry 2010年第12期53卷 2529-2538页

作者： LUO lei & ZHANG ShuZhen State Key Laboratory of Environmental chemistry and Ecotoxicology Research center for Eco-Environmental sciences,chinese academy of sciences,beijing 100085,china State Key Laboratory of Environmental chemistry and Ecotoxicology Research center for Eco-Environmental sciences Chinese Academy of Sciences Beijing China

Synchrotron-based X-ray techniques have been widely applied to the fields of environmental science due to their element-specific and nondestructive properties and unique spectral and spatial resolution *** techniques are capable of in situ investigating chemical speciation,microstructure and mapping of elements in question at the molecular or nanometer scale,and thus provide direct evidence for reaction mechanisms for various environmental *** this contribution,the applications of three types of the techniques commonly used in the fields of environmental research are reviewed,namely X-ray absorption spectroscopy (XAS),X-ray fluorescence (XRF) spectroscopy and scanning transmission X-ray microscopy (STXM).In particular,the recent advances of the techniques in china are elaborated,and a selection of the applied examples are provided in the field of environmental ***,the perspectives of synchrotron-based X-ray techniques are *** their great progress and wide application,the techniques have revolutionized our understanding of significant geo-and bio-chemical *** is anticipatable that synchrotron-based X-ray techniques will continue to play a significant role in the fields and significant advances will be obtained in decades ahead.

关键词： synchrotron spectroscopy spectromicroscopy environmental science

Synthesize TiO_2 microspheres self-assembled from nanorods via hydrothermal treatment

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Science china chemistry 2007年第2期50卷 175-178页

作者： ZHANG YiBing1,2,FENG XinJian3 & jiang lei2,3 1 Shangrao Teachers’ College,Shangrao 334001,china 2 National center for Nanoscience and Nanotechnology,beijing 100080,china 3 institute of chemistry,chinese academy of sciences,beijing 100080,china Shangrao Teachers’ College Shangrao China National center for Nanoscience and Nanotechnology Beijing China institute of chemistry Chinese Academy of Sciences Beijing China

The TiO2 microspheres were deposited on the glass substrates under certain conditions via hydro-thermal reaction using 0.15 mol·L?1 TiCl3 saturated NaCl aqueous solution adding urea as an additive. The TiO2 is characterized rutile by results of SEM,TEM and XRD techniques,the TiO2 microspheres are large scale assembled from TiO2 nanorods. The affections on the products by the factors of the con-tents of urea being an additive(the key techniques) ,the reaction temperature,the reaction time and the concentration of TiCl3 were studied. The optimum condition was found,and the mechanism of reac-tions was discussed also.

关键词： TiO2 self-assembly nanorods microsphere hydrothermal reaction

Ethylene oligomerization by novel iron(Ⅱ) diimine complexes/MAO

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chinese Science Bulletin 2002年第19期47卷 1616-1618页

作者： WANG Hang, YAN Weidong, jiang Tao, LIU Binbin, XU Wenqing, MA Jianjiang & HU YouliangState Key Laboratory of Engineering Plastics, center for molecular Science, institute of chemistry, chinese academy of sciences, beijing 100080, china Graduate Student of State Key Lab. of Eng. Plastics Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China Grad. Student chinese Acad. of Sci. Beijing 100039 China Inst. of Polymer Science/Engineering School of Chemical Engineering Hebei University of Technology Tianjin 300130 China Dept. of Petrochemical Engineering Daqing Petroleum Institute Anda 151400 China Res. Inst. Dushanzi Petrochem. Co. PetroChina Xinjiang 833600 China

Two novel Fe(Ⅱ) diimine complexes have been synthesized. In combination with MAO, they generate active catalytic systems that oligomerize ethylene with both high catalytic activity and high selectivity for a-olefins. The effects of substituents on the aryl ring, reaction temperatures and molar ratios of Al/Fe on catalytic activity and product distribution are studied.

关键词： late-transition-metal catalysts ethylene oligomerization α-olefin.

Oxidation of n-Butanol and 2-Pentanol with molecular Oxygen in Supercritical CO2

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chinese Chemical Letters 2003年第10期14卷 1070-1072页

作者： Yan Hong CHANG, Tao jiang, Liang GAO, Quo Ying ZHAO, Hai Xiang GAO, Zhong Hao LI, Jun Chun LI, Zhi Min Liu, Bu Xing HANcenter for molecular sciences, institute of chemistry, chinese academy of sciences,beijing 100080 center for molecular sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

Oxidation of n-butanol and 2-pentanol using molecular oxygen in supercritical (SC) CO2 with and without co-solvent is investigated. The results showed that the reaction selectivity is high when the reaction is carried out in SC CO2. It has been observed that co-solvent affects conversion and selectivity of the reaction considerably.

关键词： Oxidation,n-butanol 2-pentanol supercritical CO2 co-solvent.