课程文献中心 更多>>

关键词： ORGANOZINC compounds   CARBOXYLATES   CRYSTAL structure   THIN films   CHEMICAL vapor deposition   LOW pressure (Science)   SOLID state chemistry   SYNTHESIS (Chemistry)  

摘要： The organozinc fluorocarboxylates RZnO2CRf and RZnO2CRf center dot TMEDA, along with Zn(O2CRf)(2)center dot TMEDA (R = Me, Et;R-f = C2F5, C3F7) have been synthesized. The structures of EtZnO2C2F5 (5), EtZnO2C3F7 (7), EtZnO2C2F5 center dot TMEDA (11), Zn(O2C2F5)(2)center dot TMEDA (13), along with products from the adventitious reaction with either O-2 or H2O, Zn10Me4(OMe)(4)(O2CC2F5)(12) (2), Zn9Et2(O2CC2F5)(12)(O)(2) (6), Zn8Et4(OEt)(4)(O2CC3F7)(6)(O) (8), [Zn(O2CC3F7)(2)center dot TMEDA](2)center dot H2O (15) have been determined. Thin films of oriented ZnO have been deposited on glass substrates by low-pressure chemical vapor deposition (LPCVD) using 3 and 10 as precursors, though no fluorine incorporation in the films was noted. LPCVD using 13 as precursor also yielded fluorine-free ZnO, but lacking the oriented growth observed using 3, 10. However, 5, which exhibits short intermolecular Zn center dot center dot center dot F contacts in the solid state, thermally decomposes to bulk ZnF2.

关键词： 三氟甲基化   中国科学院上海有机化学研究所   碘化反应   苯炔   烃类化合物   银   原位生成   材料化学  

摘要： 含三氟甲基的芳烃类化合物由于其特殊的稳定性和亲脂性在医药、农药、材料化学等领域都有着广泛的应用.中国科学院上海有机化学研究所胡金波课题组利用三氟甲基银对原位生成的苯炔进行三氟甲基化，所得的芳基银中间体被温和的亲电试剂淬灭得到了邻三氟甲基碘苯类化合物．

关键词： 大学化学实验   化学实验课程   教学效果   考核制度   操作技能   材料化学   专业门类   教学质量   大学课堂   学  

摘要： 结合教学实践,介绍作者在长期从事大学化学实验教学实践的基础上,对该课程教学内容,教学方法及考核方式进行有效的改革尝试,结果表明教学体系和方法的改革,及考核制度的更新,大大提高了学生的操作技能和创新意识及能力。

关键词： 材料化学   专业实验   科研结合  

摘要： 本文介绍了黑龙江大学材料化学专业实验课程的一些新举措。依托绝大部分实验指导教师为科研骨干这一事实,材料化学专业实验与科研相结合,在注重基本实验技能的基础上加强探索性实验,极大的提高了学生的学习积极性,并激发了学生的创造热情和求知欲,更加有利于符合新世纪发展需要的培养创新型人才。

关键词： chemical manganese dioxide (CMD)   Na2S2O8   oxidative precipitation   lithium ion battery ternary cathodic material  

摘要： We have conducted studies to produce chemical manganese dioxides (CMDs) from ternary cathodic materials by oxidative precipitation. In this study, a cathodic material was concentrated by pretreatment and leached with sulfuric acid to recover 1 L of a leachate containing 22.0 g/dm(3) of Co, 21.6 g/dm(3) of Mn, 24.2 g/dm(3) of Ni, 9.5 g/dm(3) of Li and 8 mg/dm(3) of Al as valuable metals. For selective oxidative precipitation of Mn (II) the leachate was reacted with 1 equivalent of Na2S2O8 based on the Mn concentration with stirring at 500 rpm at a temperature of 363 K for 18000 s. As a result of the reaction, it was confirmed that the majority of Mn was precipitated from the solution. XRD, PSA, TG-DTA, LECO and ICP analyses were performed to characterize the precipitate. The analytical results revealed the production of a chemical manganese dioxide (CMD) having a chemical composition of 84.60% MnO, 1.40% Co3O4, 0.11% Li2O, 0.25% NiO, 0.02% Al2O3, 0.06% S and 0.52% Na2O, an average particle diameter of 10.7 mu m, a crystal form of gamma-MnO2, and a purity of at least 98%.

关键词： 《大学化学》课程   材料化学专业   教学质量   实践   探索  

摘要： 《大学化学》课程是材料化学专业的第一门专业基础课程。《大学化学》课程的教学质量将直接影响到本专业合格人才的培养。本文从《大学化学》课程教学资源有效效合理的配置、教学实践、课程管理与创新人才培养等方面探讨了提高《大学化学》课程教学质量的有效途径。

关键词： 材料化学   双语教学   教学方法  

摘要： 针对化学系《材料化学导论》双语选修课的特点,课题组在教学内容、课件制作、教学模式及教学方法上进行了有益的探索。通过精选教学内容,使课程在有限的学时内达到预定的教学目的;合理利用双语编写生动、形象的多媒体教学课件以及合理选择双语教学模式,使之适应首次接触材料知识的化学系学生的学习;通过多媒体教学平台将有关内容和相应的动画演示、录像有机结合起来,扩大学生的知识面,提高学生的学习积极性,此外,通过课堂小报告,促进了学生对教学的积极参与,并锻炼了学生口头和学术报告的英语语言交流能力,收到了良好的教学效果。

关键词： 材料化学专业英语   课堂教学   问题   对策  

摘要： 《材料化学专业英语》是针对材料化学专业学生开设的一门专业课程,具有很强的专业性、应用性。从目标、施教方案、反馈效果等方面进行系统策划,围绕材料化学专业英语课程教学,大力推进教学方法改革,开展切实可行的实践教学。结合教学实践,探讨如何设计教学过程,改进教学方法,提高教学效率。

关键词： 普通硅酸盐工业检测   材料化学专业   特色课程   课程实践  

摘要： 为实现材料化学专业应用型人才培养目标,根据就业需求,玉林师范学院对材料化学专业学生开设了《普通硅酸盐工业检测》特色课程。从专业课程定位、课程实施、课程见习、课程实施效果四个角度,探讨了有关特色课程建设具体的做法,并提出了今后建设的思路。这一做法取得了较好的实际效果,证明是行之有效。

关键词： energy storage   transportation   materials chemistry   electrochemistry   nanomaterials  

摘要： Large-scale electrical energy storage has become more important than ever for reducing fossil energy consumption in transportation and for the widespread deployment of intermittent renewable energy in electric grid. However, significant challenges exist for its applications. Here, the status and challenges are reviewed from the perspective of materials science and materials chemistry in electrochemical energy storage technologies, such as Li-ion batteries, sodium (sulfur and metal halide) batteries, Pb-acid battery, redox flow batteries, and supercapacitors. Perspectives and approaches are introduced for emerging battery designs and new chemistry combinations to reduce the cost of energy storage devices.