Influence of thermal overlap effects on the ultrasonic attenuation spectra of polydisperse oil-in-water emulsions
Influence of thermal overlap effects on the ultrasonic attenuation spectra of polydisperse oil-in-water emulsions
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DOI：
10.1021/la981195f
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发表时间：
1999-05-11
期刊：
影响因子：
3.9
通讯作者：
McClements, DJ
中科院分区：
文献类型：
--
作者：
Chanamai, R;Herrmann, N;McClements, DJ
本研究考察了热重叠效应对多分散乳液超声衰减的影响。测定了一系列玉米水包油乳状液的超声衰减系数与液滴浓度(1-50wt%)、体积-表面平均液滴半径(r(32)=0-12和0.58µm)和频率(1-120 MHz)的关系。对于含有0.58微米液滴的乳状液，这些测量结果与传统的超声散射理论(UST)的预测有很好的一致性，但由于热重叠效应，传统的超声散射理论(UST)大大高估了含有0.12微米液滴的乳状液的衰减，特别是在液滴浓度较高时。我们表明，UST可以扩展到使用核-壳模型来解释这些影响，并强调了可以成功使用现有UST的实验条件范围。
This study examines the influence of thermal overlap effects on the ultrasonic attenuation of polydisperse emulsions. The ultrasonic attenuation coefficient of a series of corn oil-in-water emulsions was measured as a function of droplet concentration (1-50 wt %), volume-surface mean droplet radius (r(32) = 0-12 and 0.58 mu m), and frequency (1-120 MHz). There was good agreement between these measurements and predictions of the traditional ultrasonic scattering theory (UST) for the emulsions containing 0.58 mu m droplets, but the UST greatly overestimated the attenuation of the emulsions containing 0.12 mu m droplets, especially at higher droplet concentrations, due to thermal overlap effects. We show that the UST can be extended to account for these effects using a core-shell model and highlight the range of experimental conditions over which the existing UST can be successfully used.