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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 defined in the ISO standard document 13321:1996 E and ISO 22412:2008. Ö¬ÖÊÌåµÄ·ÖÉ¢ÐÔ¿ÉÒÔÓÃPDIÀ´±íÕ÷£¬PDIµÄ¼ÆËã¿ÉÒÔ°´ÕÕÏàÓ¦µÄISO±ê×¼µÃµ½¡£ºÃµÄÖ¬ÖÊÌå·ÖÉ¢ÐÔPDIֵͨ³£Ð¡ÓÚ0.10£¬µ«ÕýÈçÉÏÃæËµµÄ£¬PDIҪСÓÚ0.05ÊǺܺ±¼ûµÄ¡£PDIÓëÖ¬ÖÊÌåµÄ´¦·½ÒÔ¼°¹¤ÒÕÃÜÇÐÏà¹Ø£¬ÊÇÖ¬ÖÊÌåÎïÀíÎȶ¨ÐÔµÄÒ»¸öÖØÒª¿¼²ìÖ¸±ê¡£ |
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