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[求助]
DLS动态光散射仪Mean Diameter比Effective Diameter小，请问为什么？
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各位木虫龘龘，我是刚接触DLS动态光散射仪，不是很懂，通过水合粒径分析，给出我几个值，分别是：Effective Diameter、Lognormal Size Distribution Results、Multimodal Size Distribution Results，但是我的effective diameter是19.9纳米的时候，其他的两个results中的值都要小于effective diameter，比如Multimodal Size Distribution Results中的Mean Diameter只有11.246，请问哪个值才是准确的？为什么Mean Diameter要小于Effective Diameter？请帮我解释一下，谢谢各位龘龘 以下是DLS给出的数据： **** Brookhaven Instruments Corp.**** ZetaPlus Particle Sizing Software Version 4.11 Sample Identification:64-1min (Combined) Operator Identification: hhl Notes: 2016-04-29 Measurement Date: Apr 29, 2016 Measurement Time: 22:52:06 Batch: 0 **** Measurement Parameters **** Temperature = 20.0 Suspension = Water Viscosity = 1.002 cp Ref.Index Fluid = 1.331 Angle = 90.00 Wavelength = 659.0 nm Dust Cutoff = 20.00 Runs Completed = 5 Run Duration = 00:00:10 Total Elapsed Time = 00:00:50 Average Count Rate = 439.1 kcps Ref.Index Real = 1.000 Ref.Index Imag = 4.400 **** Measurement Results **** 64-1min (Combined) Effective Diameter: 19.9 Polydispersity: 0.233 Baseline Index: 8.2/100.00% Elapsed Time = 00:00:50 Run Eff. Diam. (nm) Half Width (nm) Polydispersity Baseline Index --------------------------------------------------------------------------- 1 18.3 6.6 0.129 9.1/100.00% 2 18.8 8.8 0.218 7.6/100.00% 3 20.3 9.9 0.237 9.1/100.00% 4 21.4 10.7 0.250 5.8/100.00% 5 22.2 11.7 0.279 7.0/100.00% --------------------------------------------------------------------------- Mean 20.2 9.5 0.223 7.7/100.00% Std.Error 0.7 0.9 0.025 0.6/ 0.00 Combined 19.9 9.6 0.233 8.2/100.00% **** Lognormal Size Distribution Results **** GSD: 1.580 d(nm) G(d) C(d) | d(nm) G(d) C(d) | d(nm) G(d) C(d) -------------------------------------------------------------- 3.3 26 5 | 6.1 97 40 | 9.2 80 75 3.9 44 10 | 6.5 99 45 | 9.9 70 80 4.4 58 15 | 6.9 100 50 | 10.8 58 85 4.7 70 20 | 7.3 99 55 | 12.1 44 90 5.1 80 25 | 7.7 97 60 | 14.2 26 95 5.5 87 30 | 8.1 93 65 | 5.8 93 35 | 8.6 87 70 | **** Multimodal Size Distribution Results **** Mean Diameter: 11.246 Relative Variance: 0.008 Skew: 13.569 d(nm) G(d) C(d) | d(nm) G(d) C(d) | d(nm) G(d) C(d) -------------------------------------------------------------- 8.5 0 0 | 16.3 0 100 | 31.3 0 100 9.0 0 0 | 17.3 0 100 | 33.2 0 100 9.6 0 0 | 18.4 0 100 | 35.2 0 100 10.2 51 16 | 19.5 0 100 | 37.4 0 100 10.8 95 46 | 20.7 0 100 | 39.7 0 100 11.4 100 78 | 21.9 0 100 | 42.1 0 100 12.1 54 95 | 23.3 0 100 | 44.6 0 100 12.9 16 100 | 24.7 0 100 | 47.4 0 100 13.7 0 100 | 26.2 0 100 | 50.2 0 100 14.5 0 100 | 27.8 0 100 | 53.3 0 100 15.4 0 100 | 29.5 0 100 | 56.6 0 100 **** Lognormal Size Distribution Results/Spreadsheet Format **** 3.3, 26, 5 3.9, 44, 10 4.4, 58, 15 4.7, 70, 20 5.1, 80, 25 5.5, 87, 30 5.8, 93, 35 6.1, 97, 40 6.5, 99, 45 6.9,100, 50 7.3, 99, 55 7.7, 97, 60 8.1, 93, 65 8.6, 87, 70 9.2, 80, 75 9.9, 70, 80 10.8, 58, 85 12.1, 44, 90 14.2, 26, 95 **** Multimodal Size Distribution Results/Spreadsheet Format **** 8.5, 0, 0 9.0, 0, 0 9.6, 0, 0 10.2, 51, 16 10.8, 95, 46 11.4,100, 78 12.1, 54, 95 12.9, 16,100 13.7, 0,100 14.5, 0,100 15.4, 0,100 16.3, 0,100 17.3, 0,100 18.4, 0,100 19.5, 0,100 20.7, 0,100 21.9, 0,100 23.3, 0,100 24.7, 0,100 26.2, 0,100 27.8, 0,100 29.5, 0,100 31.3, 0,100 33.2, 0,100 35.2, 0,100 37.4, 0,100 39.7, 0,100 42.1, 0,100 44.6, 0,100 47.4, 0,100 50.2, 0,100 53.3, 0,100 56.6, 0,100 |
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