Interlaboratory comparison of nanoparticle size measurements between NMIJ and NIST using two different types of dynamic light scattering instruments
Interlaboratory comparison of nanoparticle size measurements between NMIJ and NIST using two different types of dynamic light scattering instruments
复制标题
使用两种不同类型的动态光散射仪器对 NMIJ 和 NIST 之间的纳米颗粒尺寸测量进行实验室间比较
DOI：
10.1088/1681-7575/ab3073
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发表时间：
2019
期刊：
影响因子：
2.4
通讯作者：
K. Ehara
中科院分区：
文献类型：
--
作者：
Kayori Takahashi;J. Kramar;N. Farkas;K. Takahata;I. Misumi;K. Sugawara;S. Gonda;K. Ehara
讨论了如何将固定角度动态光散射（DLS）仪器测量的粒径与多角度动态光散射（DLS）仪器测量的粒径相关联。采用两种不同类型的DLS仪器测量了公称直径为100nm、70nm、50nm和30nm的近单分散聚苯乙烯乳胶（PSL）颗粒，其中一种是日本国家计量研究所（NMIJ）的多角度型DLS仪器，另一种是美国国家标准技术研究所（NIST）的固定角度型DLS仪器。采用多角度仪测量了不同散射角和不同悬浮液浓度下PSL颗粒的平均粒径。利用这些数据，通过最小二乘拟合方法建立了测量粒度与散射角和颗粒浓度的函数关系。然后用建立的函数来预测如果在NMIJ选择与NIST相同的散射角和颗粒浓度，将得到的平均颗粒尺寸。在补偿了角度和浓度差异后，NIST和NMIJ获得的四种PSL颗粒样品的平均粒径相当一致。本研究的结果清楚地表明，在使用DLS获得的平均粒径的方法内比较中，考虑测量粒度对散射角和颗粒浓度的依赖是至关重要的。
The question of how to relate particle sizes measured using a fixed-angle dynamic light scattering (DLS) instrument with those measured using a multi-angle DLS instrument is addressed. A series of nearly monodisperse polystyrene latex (PSL) particles with nominal diameters of 100 nm, 70 nm, 50 nm, and 30 nm were measured using two different types of DLS instruments: one owned by the National Metrology Institute of Japan (NMIJ) of the multi-angle type and the other owned by the National Institute of Standards and Technology (NIST) of the fixed-angle type. The mean particle size of the PSL particles was measured using the multi-angle-type instrument at various scattering angles and at various concentrations of particle suspension. These data were used to establish the functional dependence of the measured particle size on the scattering angle and particle concentration through the least-squares fitting method. The established function was then used to predict the mean particle sizes that would have been obtained if the same scattering angle and particle concentrations as those used at NIST had been selected at NMIJ. The mean particle sizes obtained at NIST and at NMIJ agreed quite well for all four PSL particle samples after compensating for the angle and concentration differences. The result of this study clearly demonstrates that consideration for the dependence of measured particle sizes on the scattering angle and particle concentration is crucial in intra-method comparisons of mean particle sizes obtained using DLS.