多角度动态光散射法的纳米颗粒精确测量

doi:10.3969/j.issn.1000-1158.2020.05.04

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Abstract Based on the principle of dynamic light scattering, an independent multi-angle dynamic light scattering device was used to investigate the accurate measurement methods of nano and submicron particle size. The precision incident light path design with diaphragm group, matching liquid pool and beam-stop design were adopted in the self-developed device, which greatly improved the signal-to-noise ratio. At the same time, the interference of the reflected light signal caused by the different refractive index between the sample cell and the air interface in the complementary direction of the measurement angle was avoided. On this basis, the polystyrene (PS) particle solution with different concentration and particle size was determined and its uncertainty was analyzed. The results showed that for PS particles with the same particle size, multiple scattering first occurs at large and small measurement angles when the particle concentration is increased. The closer to 90°, the higher the multiple scattering concentration is. With the increase of particle size, the particle size measurement results showed a strong angular dependence and even volatility due to the non-negligible interaction between particles.

Key words： metrology particle size measurement nanoparticle multi-angle dynamic light scattering multiple scattering angle dependence

Received: 30 April 2019 Published: 14 May 2020

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TB92

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2020.05.04 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2020/V41/I5/529

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