消光法测量乳剂颗粒的研究  

Study on the measurement of emulsion particles by using light extinction method

作　　者：龙明晖[1] 苏明旭[1] 蔡小舒[1] 

机构地区：[1]上海理工大学颗粒与两相流测试技术研究所,上海200093

出　　处：《光学仪器》2010年第3期18-22,共5页Optical Instruments

基　　金：国家自然科学基金资助项目(50706029;50836003);上海科委纳米计划资助项目(0852nm06700)

摘　　要：为研究消光法颗粒粒径测量中浓度和双层球形颗粒问题,根据Lambert-Beer定律,对不同浓度下的乳剂和PBA/PMMA双层球颗粒乳剂采用多波长消光法进行测量分析。实验结果表明:当颗粒物浓度超出某一临界浓度范围后,由消光法测量的粒径结果将受浓度变化的剧烈影响;对于核壳结构的双层球形颗粒,如果两层结构的折射率相差不大,采用其中一种折射率通过消光法来测量,其结果仍比较准确,误差不大。To investigate the effects of concentration and core-shell spherical particles on particle sizing in light extinction method, and based on Lambert-Beer Law, a series of experiments on emulsion particle sizing at different concentrations for PBA/PMMA core-shell particles are carried out by using multi-spectral light extinction method. The measured results of particle size demonstrate that experiments have been dramatically affected by variation of particle concentration over a critical concentration. In addition, the measurement and comparison with classical light scattering method for PBA/PMMA core-shell particles illustrate that for the case of similar refractive indices in core and shell layer, the assumption of coreshell particle in theoretical model could be replaced safely by a single spherical particle with one of the refractive indices above, which still yields accurate results.

关 键 词：消光法 浓度 PBA/PMMA 核壳双层颗粒 

分 类 号：TN249[电子电信—物理电子学]