纳米二氧化硅用于LR6电池

通过在溶胶-凝胶法制备二氧化硅(SiO2)的过程中滴加γ-(甲基丙烯酰氧基)丙基三甲氧基硅烷(MPMS),制得改性SiO2。透射电镜和红外光谱分析表明:制备的SiO2粒子为单分散性、粒径均一的纳米球形颗粒。将产物用作LR6电池添加剂,测试电池的电性能、高温贮存性能和防漏性能。纳米SiO2粒子对新电性能的影响不大,但能提高电池的高温贮存性能和防漏性能。当正极中SiO2添加量为0.6%时,60℃高温贮存20 d,综合电性能提高6%;60℃高温、90%湿度贮存60 d,漏液率降低62%。     

乙二胺四乙酸四钠盐缓释微胶囊的制备与表征

The microcapsules with cores of ethylenediamine tetraacetic acid tetrasodium salt (Na4-EDTA) and walls of polyurea were synthesized via an interfacial polycondensation reaction with 2,4-tolylene diisocyanate as an oil-soluble monomer and diethyl triamine as a water-soluble monomer. Various manufacturing parameters, including the amount of emulsifier, agitation speed, stirring time and ratios of the wall materials to core materials, were altered to optimize process variables during the synthesis of microcap-sules, and the effects of these parameters on the characteristics of the microcapsules were examined. The structure, morphology, mean particle size and size distribution were characterized by optical microscope and scanning electron microscopy (SEM), showing that the mean diameter of optimal microspheres was approximately 6 μm, and microcapsules were spherical. In vitro release of Na4-EDTA from these microcapsules was performed in distilled water. Under the optimal preparation conditions, the Na4-EDTA re-lease profiles were biphasic with a burst release followed by a gradual release phase. After an initial burst, a continuous Na4-EDTA release was up to 5-7 days. The optimal synthesis conditions for the microcapsules with stable, good morphology and good con-trolled-release properties were as follows: emulsifier Span-80 10% (by mass), agitation speed 900 r&;#8226;min－1, stirring time 30 min, and the ratio of the wall materials to core materials 0.15.     

膨润土固体酸催化剂的制备及性能研究

用不同酸对膨润土进行酸化处理得到活性白土,并以活性白土为栽体浸渍负载氯化铁,得到FeCl3膨润土固体酸催化剂;以四氢呋喃阳离子开环聚合为探针反应,考察酸化条件对FeCl3膨润土催化剂性能的影响;利用XRD、BET、SEM及正丁胺滴定法对催化剂进行表征.结果表明,在质量分数为25%的硝酸98℃下酸化2 h,制备的催化剂性...     

风景园林规划设计课程建设发展趋势

在当前课程开展形式的基础上,开发出新型教学方法,探讨风景园林规划课程的建设方式,以提高风景园林规划课程的教学水平,让学生学以致用。     

基于WinCE的在线流媒体播放器的软件设计

互联网的迅猛发展和普及为流媒体业务发展提供了强大的市场动力,流媒体业务正变得日益流行。基于此设计了一个基于WinCE 6.0操作系统的在线流媒体播放软件,运用Visual Studio 2005开发工具的Direct-Show技术来开发在线流媒体播放程序的具体方法和程序代码。阐述了整个流媒体播放程序的实现流程,真正实现了在线流媒体播放。