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关键词： 材料化学   实践教学   体系建设  

摘要： 实践教学在材料化学专业教育中占有重要地位,对培养荦生的创新精神和实践能力具有十分重要的意义.本文介绍了我校材料化学系为培养高素质的创新人才在实践教学体系所进行的实践和探索,阐述了实践教学理念、实践教学内容体系、实践教学方法等,提出以基础教学实践环节为主,同时也要加强探索性实践环节,建立校内实验主与校外基地相结合,实践教学与理论教学相衔接的分层次、多模块的实践教学体系.

关键词： 材料化学   重点实验室   江西省   功能  

关键词： 独立学院   化学化工   实验   实践   教学改革  

摘要： 本文结合电子科技大学中山学院化学与生物系的教学改革实践,根据培养应用型人才的需要,提出了一种阶梯式实践教学模式,将大学四年的实验实践分成"基础实验→专业实验→综合实验→实训实验→专业生产实习→毕业设计"等6个层次,分阶段由低到高,各具特色的阶梯式实践教学体系,每个阶梯层次的侧重点不同,层次间又互相衔接融合。论述了各个层次的内涵、培养目标、特色、实施办法。

摘要： Solid acid is a class of materials that shows potential as a fuel cell electrolyte. Understanding the phase and mechanical stability are required for further development of this technology. We addressed both issues in this work. We expanded the use of the crystallographic theory of the phase transformation to three major classes of solid acids. That allowed us to relate material properties hysteresis to fundamental crystallographic and thermodynamic parameters. The understanding of the mechanism of the transformation can guide the effort to create materials with desired hysteresis. Careful investigation of the thermal and phase behavior of CsHSO4, CsH2PO4, Rb3H(SeO4)2 and in Cs1-xRb xH2PO4 solid solution series for both low and high temperature phases was performed and crystal symmetry and lattice parameters for Cs0.75Rb0.25H2PO4, T=240°C phase were found for the first time. Consistency between predicted and measured properties was shown for all three different classes of solid acids as well as for the isostructural solid solution series. Nanocomposite materials based on cesium hydrogen sulfate and nanometer size silica were characterized. We observed 30–40 nm size surface stabilization of our material at the high temperature phase, otherwise metastable at room temperature. We developed methods to quantitatively study interface phases and its effect on ion mobility. The method allowed us to quantitatively find crystalline and amorphous amounts in the composites. We observed 3–4 order decrease in spin-lattice relaxation values of the metastable phase in the composite. Solid state NMR allowed surface interactions directly and suggest high ion mobility. Strong effect on superprotonic transition temperature in composites was observed. Superprotonic phase was stable in composites at temperatures up to 70°C below phase transition compared with pure phase CsHSO4. The mechanism and activation energy of the creep plastic deformation in CsHSO4 were found. Based on that, a met

关键词： ORGANIC compounds   ALKOXIDES   CRYSTALLOGRAPHY   CHEMICAL vapor deposition   PHYSICAL & theoretical chemistry  

摘要： A series of novel organozinc aminoalcoholates have been synthesized by the reaction of the amino alcohols HOCH(x)(CH(2)NMe(2))(3-x) (x = 2, Hdmae;1, Hbdmap;0, Htdmap) with R(2)Zn (R = Me, Et). The 1:1 reaction with Hdmae leads to the tetramers [RZn(dmae)](4) [R = Me (1), Et (2)], while with Htdmap, dimeric [RZn(tdmap)](2) [R = Me (7), Et (8)] are produced. Reaction with Hbdmap only yields [MeZn(bdmap)](n) (3), an oil which mass spectral data suggests contains a mixture of Zn(2) - Zn(7) species, when a 2-fold excess of ligand is used. Crystals of dimeric [Zn(bdmap)(2)center dot Hbdmap](2) (4) deposit from this oil on prolonged standing. Reaction of Et(2)Zn with Hbdmap (1:1) affords [EtZn(bdmap)](n) (5), also an oil made up of Zn(3) and Zn(4) clusters on the basis of mass spectral evidence. Crystals of EtZn(3)(bdmap)(5) (6) are formed within the oil that is 5 on standing. [MeZn(tdmap)](2) (7) has been used as a single-source precursor for hexagonal ZnO films under low pressure chemical vapor deposition (LPCVD) conditions and a substrate temperature of 500 degrees C.

关键词： Diamond软件   材料化学   辅助教学  

摘要： 材料的晶体结构是《材料化学》课程中的重要内容,是理解材料物理性质的基础。本文针对晶体结构的几何学描述理论体系,总结应用Diamond软件辅助课程教学,帮助学生理解复杂晶体结构的学习过程。具体以金红石型TiO_2和萤石CaF_2的结构为例,运用该软件分别构建它们的晶体结构,从帮助学生理解和掌握抽象晶体结构概念的角度出发,阐明学习和理解晶体结构的描述几何学原理相关参数的意义。

关键词： 材料化学导论   教学改革   教学效果  

摘要： 材料化学导论是材料化学专业一门重要的基础学科。本文阐述了在课程教改过程中,对教学内容、教学模式和考核方式方面的探索和体会。

关键词： 材料化学   科研   本科教育   创新机制  

摘要： 本文在对比研究了国内外材料化学本科教育的现状及发展趋势的基础上,提出了以培养创新意识为目的、以科研促进材料化学本科教育、让理论基础与实践前沿更好结合的新型教育机制。这其中包括科研在理论教学中的有机渗透,以及科研与实践教学的有机融合。分别从教学手段的多元化和教学内容的多层次化等方面探讨了科研与本科理论教学有机结合的切入点,并试图构建"走近科研"、"专业综合性实验"、"创新人才培养计划"等多个科研与本科实践教学良好衔接的载体,力争实现科研与教学的相互融合与促进,最终达到两者的双赢。

关键词： 材料科学与工程学院   计量   中国   材料物理   材料化学   重点学科   化学学科   硕士学位  

关键词： ORGANOCADMIUM compounds   SOLUTION (Chemistry)   LIGANDS (Biochemistry)   CADMIUM   DIMERS  

摘要： The novel methylcadmium aminoalkoxides MeCd(dmae) (Hdmae = dimethylaminoethanol), MeCd(bdmap) [Hbdmap = 1,3-bis-(dimethylamino)-propan-2-ol], and MeCd(tdmap) [tdmap = 1,3-bis(dimethylamino)-2-(dimethylaminomethyl)propan-2-ol] have been synthesized and structurally characterized. MeCd(dmae) (1) forms a tetrameric heterocubane with a Cd4O4 core, while MeCd(bdmap) (2) is trimeric and MeCd(tdmap) (3) is a dimer. Only in the case of MeCd(dmae) are all the ligand donors fully utilized. In solution, MeCd(tdmap) undergoes a Schlenk equilibrium, with Me2Cd and Cd(tdmap)(2) evident at 218 K. The structure and solution-state chemistry of Cd(tdmap)(2) (5) have been independently studied and, in the solid-state, found to exist as a dimer whose coordination number at cadmium (CN = 6) is greater than in the organocadmium complexes (CN = 4, 5). MeCd(tdmap) has been used as a single-source precursor for CdO films by LPCVD with a glass substrate temperature of only 140 degrees C. Evidence is also presented for the formation of a heterometallic precursor, [(MeZn)(MeCd)(tdmap)(2)] (6), which has been used to deposit films of CdO mixed with ZnO by LPCVD at 140 degrees C. The structure of Me4Cd4(tdmap)(2)Cl-2 (4), obtained serendipitously, is also included. Crystal data: 1, C20H52Cd4N4O4, FW 862,26, triclinic, P (1) over bar, a = 11.47560(10), b = 13.55400(10), c = 21.5966(2) angstrom, alpha = 99.7869(4), beta = 90.7476(4), gamma = 98.7823(4)degrees, V = 3268.82(5) angstrom(3), Z = 4;2, C27H67Cd3N6O3, FW 861.07, triclinic, P (1) over bar, a = 11.4148(2), b = 13.1886(2), c = 14.3139(3) A, alpha = 102.1962(10), beta = 108.3064(10), gamma = 100.8446(10)degrees, V = 1923.09(6) angstrom(3), Z = 4;3, C22H54Cd2N6O2, FW 659.51, monoclinic, P2(t)/n, a = 10.2912(1), b = 13.46930(1), c = 11.79130(1) angstrom, beta = 112.8051 (1)degrees, V = 1506.59(2) angstrom(3), Z = 2;4, C24H60Cd4Cl2N6O2, FW 985.28, monoclinic, P2(1)/c, a = 10.89780(10), b = 20.3529(2), c = 16.5317(2) A, p = 94,8550(10)degrees, V