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加油鄒銅蟲 (小有名氣)
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[求助]
請問DLS中的PDI(分布系數(shù))是怎么算的,公式是什么
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| 如題 |
專家顧問 (知名作家)
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專家經(jīng)驗: +181 |
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Polydispersity Index This index is a number calculated from a simple 2 parameter fi t to the correlation data (the cumulants analysis). The Polydispersity Index is dimensionless and scaled such that values smaller than 0.05 are rarely seen other than with highly monodisperse standards. Values greater than 0.7 indicate that the sample has a very broad size distribution and is probably not suitable for the dynamic light scattering (DLS) technique. The various size distribution algorithms work with data that falls between these two extremes. The calculations for these parameters are defi ned in the ISO standard document 13321:1996 E and ISO 22412:2008. |
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