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Study on the coating of nano-scale SiO_2.film on the surface of nanocrystalline Mg-Al layered double hydroxides

Science china Chemistry 2005年第2期48卷 107-114页

作者： zhang zejiang1,2.{2. MEI Xiujuan2. XU Chenghua1 & QIU Fali1 1. Chengdu Institute of Organic Chemistry, chinese {{2. of Sciences, Chengdu 610041, china 2. Sichuan Fire Research Institute of Public Security Ministry, Chengdu 6118{2., china {2. g.aduate school of the chinese {{2. of Sciences, beijing 100039, china correspondence should be addressed to zhang zejiang (email: zzjzzjzz@***) Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu China Sichuan Fire Research Institute of Public Security Ministry Chengdu China g.aduate school of the {2. {3. of Sciences Beijing China

The coating process of a nano-scale SiO2.film on the nanocrystalline Mg-Al layered double hydroxides via a sol-gel process was investigated. The uniform and dense SiO2.ilm with a thickness of about 5 nm on the nano-LDHs particles was characterized by the solubility test in the dilute HNO3.or HCl acid, TEM and FT-IR, XRD, Tg and DSC. The chemical shifts of binding en- ergies of Al 2., Mg 2., Si 2. and O 1s on the coated particles indicate that the coating of the SiO2.nano-film on the surface of the nano-LDHs proceeds through the formation of Mg-O-Si and Al-O-Si bonds. The thermal analysis shows that both the SiO2.coated nano-LDHs and the nano-LDHs have a similar mass loss process, in which there are three obvious stages of mass loss in the temperature range of 40—700℃. Furthermore, the more the coatedamount of SiO2.n the surface of the nano-LDHs is, the less the mass loss of the samples is at 700℃.The nano- LDHs have two obvious endothermic peaks at 2.4.67℃ and 43..13., whose corresponding heat absorption capacities are 412.2. J/g and 3.6.3. J/g, respectively. In contrast, the coated nano-LDHs have only one endothermic peak at 2.3.60℃ with a heat absorption capacity of 2.1.2. J/g.

关键词： layered double hydroxides, nanocrystalline, silica, coating.

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Cloning and roles of goldfish maternal factor β-Catenin cDNA in embryonic development

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chinese Science Bulletin 2004年第7期49卷 683-688页

作者： zhang Jingpu1,2.WANg Weixian1 & ZHU Shaoxia1 1.Institute of genetics and Developmental Biology,chinese {2. of Sciences,{3. 100080,china 2.The g.aduate school of the chinese {2. of Sciences,{3. 100039,china {12. {13. be addressed to zhang Jingpu Institute of genetics and Developmental Biology Chinese Academy of Sciences Beijing 100080 China g.aduate school of the {2. {3. of Sciences Beijing 100039 China

Interaction between nucleus and cytoplasm has been focused in the field of animal embryonic development, in which study of maternal factors is required positively. b-Catenin, an important maternal factor in early embryo-genesis, has been analyzed in its expression pattern and func-tions in this paper. We have cloned goldfish b-Catenin cDNA gene and compared it with zebrafish b-Catenin cDNA. High homology was found in cDNA and in amino acid sequences between them, 93. (2.2./2.0}4 bp) and 98.5% (768/780 aa) respectively. The expression pattern of b-Catenin by in situ hybridization and the roles of b-Catenin on embryonic de-velopment by co-injection of anti-sense RNA and reporter gene, EgFP have been investigated in the whole process of goldfish embryonic development. The results suggest that b-Catenin presents dynamic distribution, mainly locates at body axis, dorsal tissues, head and tail structures after being fertilized. The loss of b-Catenin activity would cause serious destruction of embryo in dorsal tissues and in anteroposte-rior axes, and leads embryos to die before larva get hatched.

关键词：胚胎发育母体因子金鱼基因克隆氨基酸序列 cDNA 细胞质细胞核

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Ultramafic xenoliths in Mesozoic diorite in west Shandong Province

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Science china Earth Sciences 2004年第6期47卷 489-499页

作者： CHEN Lihui1,2.& ZHOU Xinhua2.1.The Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,china and school of Earth and Space Sciences,Peking University,{2. 100871,china 2.Institute of geology and geophysics,chinese academy of Sciences,{2. 10002.,china correspondence should be addressed to Chen Lihui(email: lihui_chen@***) The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education China and School of Earth and Space Science Peking University Beijing China Institute of geology and geophysics Chinese Academy of Sciences Beijing China

Ultramafic xenoliths are common in Tietonggou intrusion, Laiwu, Shandong Prov-ince. Peridotite xenoliths develop two-stage metasomatism popularly: (i) The early metasoma-tism is characterized by intergranular clinopyroxene and phlogopite; (ii) The later metasomatism is characterized by orthopyroxene veins with a few plagioclases and amphiboles. These ul-tramafic xenoliths are thought to be mostly from the crust-mantle transitional zone on the basis of their combination, mineral chemistry, equilibrium temperature, and metasomatic characteristics. Major elements, rare earth elements, and Sr-Nd isotopic composition of the ultramafic xenoliths indicate that there is a petrogenetic relationship between the silica-enriched xenoliths and their host diorites. We propose that such silica enrichment might be an indicator of melt-rock interac-tions in the Mesozoic lithosphere beneath western Shandong.

关键词： ultramafic xenoliths, crust-mantle transitional zone,metasomatism, Tietonggou intrusion, Laiwu.

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Assembly of gold nanoparticles with H_(10)TTPR (3., 4, 5, 8, 9, 9a, 10, 11-octa-hydro-2.,3.-1,6,7,12.tetrathia-perylene) as the rigid cross-linker

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chinese Science Bulletin 2004年第8期49卷 789-792页

作者： SHAO Xiangfeng1,2. WANg Tongxin1, zhang Deqing1, XU Wei 1 & ZHU Daoben1 1. Organic Solids Laboratory, Center for Molecular Sciences, Institute of Chemistry, chinese {2. of Sciences, {3. 100080, china 2. g.aduate school, chinese {2. of Sciences, {3. 100080, china correspondence {12. be {13. to Zhu Daoben or zhang Deqing (e-mail: dqzhang@***) Organic Solids Laboratory Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China g.aduate school Chinese Academy of Sciences Beijing 100080 China

gold nanoparticles were assembled with the rigid cross-linker, H10TTPR. The assembly process was stud-ied with the UV-vis spectroscopy and TEM. By adjusting the amount of H10TTPR added to the gold nanoparticle solutio... 详细信息

关键词：纳米金粒子集成刚性交叉连接 TEM UV-力光谱学

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