资料摘要
资料下载The phenomenon of diffusion has been known for centuries. For example,the ancients who dyed fabrics certainly noticed the leading edge of their turquoise dye propagating through their cotton cloth, and biologists have long been aware of osmosis through various membranes. With our century’s advances in engineered materials, scientists and engineers are now able to design diffusive layers to provide controlled rates and selectivity of diffusion. There are a number of applications of engineered diffusion in current technology. Some are medical: drug patches allowing sustained slow release of a pharmaceutical, and membranes are used in dialysis and various laboratory separation procedures. Similar to the use of drug patches is the agricultural use of slow-release nodules to provide sustained fertilisation of soil. Industrial production of chemicals and foodstuffs often depend on separations with various membranes. Other applications are of a less organic nature, as in the separation of gases by selective diffusion through membranes, and of ions through a solid, which might be part of a battery or other electronic device. Sometimes, diffusion is an undesirable phenomenon, as when we wish to store gases dissolved in a solid, and they can diffuse out over time, or when diffusion of oxygen into a semiconductor crystal can depreciate the performance of an electronic device.
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简介:HORIBA AQUALOG同步吸收-三维荧光扫描光谱仪,同时测定紫外可见吸收和三维荧光的光谱仪系统。
EPMA 在稀土元素测试中的应用
简介:我国有丰富的稀土资源,约占世界己探明储量的80%以上。稀土应用已遍及化学工业、冶金金属、电子加工、玻璃陶瓷、激光技术、医疗和农业生产等多个领域及行业,经济效益十分显著。近年来稀土应用领域越来越广泛,新的应用不断出现。稀土在高新技术领域的应用前景十分广阔,是高新技术发展的战略材料。稀土元素具有很好的光、电、磁性质,成为光、电、磁等新型功能材料的核心。它还可以与其他元素组合成性能优异的功能材料,在新材料发展中起重要作用。
氧化锆陶瓷的Rietveld精修
简介:由于相变增韧效果,氧化锆陶瓷再工程陶瓷中有着广泛的应用。本文使用岛津X射线衍射仪测试了氧化锆陶瓷粉末,物相分析结果显示其中含有氧化锆单斜相和四方相。使用MAUD软件完成了Rietveld精修,拟合结果良好。
FluoroLog和FluoroMax的灵敏度-FluorologFluoroMax
简介:FluoroLog和FluoroMax的灵敏度-FluorologFluoroMax FluoroLog和FluoroMax的灵敏度-FluorologFluoroMax
同步吸收-三维荧光扫描光谱仪
简介:同步吸收-三维荧光扫描光谱仪,同时测定紫外可见吸收和三维荧光的光谱仪系统: 扫描速度极快 灵敏度超高 完全消色差的耦合光学系统 自动化程度高
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