Characterization of Dense Particle Suspensions Using Frequency-Domain Photon Migration

eva M. Sevick-Muraca，普渡大学，目的是开发频率域光子迁移（FDPM）技术，用于评估10%至50%体积的浓缩悬浮液中的粒径和颗粒相互作用参数。这种反问题分析是基于混浊、多重散射样品中的光扩散。该技术包括发射强度调制光并监测其在介质中传播时的相位延迟和幅度解调。测量可以提供颗粒大小分布或颗粒相互作用。将发展在线测量能力。粒子相互作用的聚合物诱导损耗增强，静电排斥，和立体稳定的胶体粒子将被测量。如果成功，该研究将为在线测量油漆、油墨、聚合物复合材料和其他胶体混合物中感兴趣的密集悬浮液中的粒径分布和颗粒相互作用提供一种技术。

Abstract9876583Eva M. Sevick-Muraca, Purdue UniversityThe objective is to develop the frequency domain photon migration (FDPM) technique for assessment of particle size and particle interaction parameters in concentrated suspensions of 10% to 50% by volume. This inverse problem analysis is based upon the light diffusion in turbid, multiple scattering samples. The technique consists in launching intensity-modulated light and monitoring the phase-delay and amplitude demodulation as it propagates through the medium. The measurement can provide either particle size distribution or particle interactions. On-line measurement capabilities will be developed. Particle interactions for polymer induced depletion enhancement, electrostatic repulsion, and steric stabilization of colloidal particles will be measured. If successful, the research will provide a technique for on-line measurement of particle size distribution and particle interactions in dense suspensions of interest in paints, inks, polymer composites and other colloid mixture applications.