共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
4.
5.
6.
7.
在电化学授课过程中应用Materials Studio和VESTA等软件对电极材料结构及催化剂催化活性的影响因素等知识点进行辅助教学,使相关的教学内容变得形象、简单。这不仅激发了学生对电化学课程的学习兴趣,提高了课堂教学效果,更有利于培养学生的科研思维和探索能力。 相似文献
8.
9.
作为超级电容器的电极材料,Ni(OH)2具有理论比电容高、来源丰富、环境友好等优点,但较低的电导率影响了其实际性能。解决该问题的一种有效方法是在碳布导电基底上原位生长Ni(OH)2薄膜。以此为基础设计综合化学实验,通过Ni(OH)2/碳布薄膜电极的制备、表征及电化学性能测试,使学生进一步理解化学平衡原理在材料合成中的应用,了解材料的基本表征方法,掌握循环伏安法、恒流充放电法等电化学分析方法在实际测试中的运用与解析,从而达到巩固电化学理论知识、培养学生的实验技能、提高学生综合实验能力的目的。本实验的开展还可以帮助学生了解储能领域的科技前沿,激发学生的科研兴趣,培养学生的科研创新意识,适合在大学化学实验中推广应用。 相似文献
10.
金属电化学腐蚀的实验探究 总被引:2,自引:0,他引:2
金属的电化学腐蚀是高二化学新教材(人教版)“原电池原理及其应用”一节的教学难点,教师按照传统的教学方法向学生讲清楚钢铁在潮湿空气里形成原电池时正、负极发生的反应并不容易。笔者在教学实践中采用实验探究式教学,把课堂教学与研究性学习结合起来,引导学生通过自主活动来探究金属电化学腐蚀的一些规律,既有助于理解、巩固化学知识,又能培养学生的实践能力和探究精神。 相似文献
11.
由于方法的使用范围广、光学系统简单和操作容易,电致化学发光(ECL)得到人们的广泛重视。随着对ECL研究的深入,ECL研究所涉及的领域和层面已有很大的扩展,特别是近十年来,ECL研究发展更为迅猛。除ECL理论研究外,为了适应分析检测的应用的需求,ECL在新材料、新实验技术和方法方面出现了许多的研究报道。本文综述最近几年来ECL研究在新材料应用和新实验技术的开发方面的一些进展,包括纳微米材料和量子点材料在ECL方面的研究,同时对固态ECL和基于三原色(RGB)机理的可视化ECL研究进展,进行了一些讨论。最后,综述展望纳米和量子点材料修饰电极ECL的研究和应用的前景。 相似文献
12.
介绍了中国烟花发生和发展的历史梗概,以及烟花中的化学知识和化学反应原理,阐述了北京奥运会和残奥会上烟花所体现出来的“科技奥运”、“绿色奥运”和“人文奥运”,诠释并展现了绿色化学的新视野。 相似文献
13.
J. Gopalakrishnan 《Journal of Chemical Sciences》1984,93(3):421-432
A survey of recent developments in preparative solid state chemistry shows that, with a knowledge of structural chemistry
and reactivity patterns of solids, it is possible to synthesize a variety of new solids possessing novel structures. A distinction
is made between synthesis ofnew solids and synthesis of solids bynew methods. Three new routes to solid state synthesis are recognized: the precursor method, and topochemical methods involving redox
and ion-exchange reactions. The low-temperature topochemical methods enable synthesis of metastable phases that are inaccessible
by the high temperature route. Several illustrative examples of solid state synthesis from the recent literature are presented. 相似文献
14.
P. S. Gill S. R. Sauerbrunn B. S. Crowe 《Journal of Thermal Analysis and Calorimetry》1992,38(3):255-266
A new thermogravimetric instrument is introduced, Hi-ResTM TGA 2950. The Hi-ResTM TQA gives a significant improvement to TG results. The instrument control parameters are varied as a function of the sample's rate of weight change. This novel feature improves resolution and reduces analysis time. The maximum heating rate and resolution index are user selectable.Data presented demonstrate improved resolution for survey TG thermal curves and very high resolution for difficult to resolve complex materials. Results are demonstrated for many types of samples including: homopolymers, polymer blends, inorganic reference materials, and complex organic mixtures.Hi-Res trademark and patent applied for by TA Instruments, Inc.
Zusammenfassung Es wird das neue thermogravimetrische Gerät Hi-ResTMTGA2950 vorgestellt. Mit Hilfe von Hi-ResTMTGA2950 ergibt sich eine eindeutige Verbesserung der TG-Resultate. Die Kontrollparameter des Gerätes werden als eine Funktion der Massenänderungsgeschwindigkeit der Probe geändert. Diese neue Eigenschaft verbessert die Auflösung und verringert die Analysenzeit. Maximale Aufheizgeschwindigkeit und Auflösungsindex können vom Anwender bestimmt werden.Die dargelegten Daten zeigen eine verbesserte Auflösung der TG-Kurven und eine sehr hohe Auflösung für schwer aufzulösende komplexe Substanzen. Es werden Ergebnisse für zahlreiche Beispiele gegeben: Homopolymere, Polymergemische, anorganische Referenzsubstanzen und komplexe organische Gemische.Das Warenzeichen Hi-Res und das Patent wurde von TA Instruments,Inc. beantragt.相似文献
15.
P. Davies W. -D. Emmerich S. Knappe 《Journal of Thermal Analysis and Calorimetry》1993,40(3):1025-1030
The capabilities of the new NETZSCH thermo-microbalance TG 209 are illustrated by four applications from the polymer industry. 相似文献
16.
Green Chemistry and Modern Technology 总被引:4,自引:0,他引:4
The basic principles, approaches, and early achievements of green chemistry are considered. The definition of green chemistry as a branch of chemistry that studies the laws of passing of chemical reactions and the properties of substances participating in such reactions, with the aim of acquiring basic knowledge that provides a basis for designing chemical technologies that eliminate (sharply curtail) the use and production of materials that pose a risk to the environment. 相似文献
17.
Summary Three columns, mono-ol, butylphenyl and perfluorinated synthesized through the reaction of an olefin with a silica hydride intermediate, are evaluated for the separation of various model compounds. Two of the columns, mono-ol and perfluorinated, can operate in both the normal phase and reversed phase modes. Some effects of the hydride surface are detected, particularly for the perfluorinated phase. A four-component steroid mixture is tested on both the mono-ol and perfluorinated phases in the normal mode. 相似文献
18.
It has been well-known that the heat distortion temperature of resin is effectively enhanced by the incorporation of a maleimide unit. However, an economical industrial production method for maleimide was not yet established. We have established a new industrial production method of maleimides based on a reaction model which was revealed by analyzing the reactions occurring in the dehydration of maleamic acid. Especially, we have developed a new re-usable catalyst which has high performance without corrosion problems and a new process having superior productivity of maleimide with a high yield. This method contains the following two features: (1) a new catalyst, supported orthophosphoric acid and its amine salt mixture; (2) employment of a reaction to change the by-product to maleimide. 相似文献
19.
计算PbO—Bi_2O_3—Nb_2O_5系化合物的声光品质因数M_2在14—19范围,可与PbO·MoO_3相比,故选择此系统作为开拓新声光材料的研究对象。 用X-射线相分析、电子探针、差热分析等手段,确定了一个新的化合物,其组成为3PbO·Nb_2O_5:Bi_2O_3=20:1(mole),属3PbO·Nb_2O_5—Bi_2O_3膺二元系中一稳定化合物,采用熔剂法生长了外形为六角形、深桔色的透明片状单晶。用透射Laue、Weissenberg照相及四园衍射仪,对其结晶学特征进行了研究。 相似文献
20.
R. T. Richardson 《Journal of Thermal Analysis and Calorimetry》1994,42(4):771-780
A thermobalance has been converted to allow interactive control of the heating rate from the rate of mass loss of the sample (Constrained Rate Thermogravimetry). The interfacing of the balance and temperature controller both to an ACORN RISC microcomputer and to a PC microcomputer is described along with an outline of the software required. This provides an economic route for the conversion of existing thermobalances. Problems of achieving effective control and acceptable data recording are outlined. The nature of the TG curves obtained from interactive temperature control and the influence of control parameters is discussed. 相似文献