Microscopic Measurement of Diffusion

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 centurys
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. 多功能拉曼及成像光谱仪 AFM-拉曼联用 智能型拉曼光谱仪 智能型全自动拉曼光谱仪