Hills B P, Manoj P, Destruel C
Institute of Food Research, Norwich Research Park, Colney, Norwich, UK.
Magn Reson Imaging. 2000 Apr;18(3):319-33. doi: 10.1016/s0730-725x(99)00143-5.
The pulsed field gradient stimulated echo technique with selective excitation is used to probe the diffusion of water in the continuous phase of concentrated oil-in-water emulsions. The dependence of the echo amplitude, S(q,Delta), on wavevector, q, and diffusion time, Delta, shows that the water diffusion propagator is sensitive to emulsion microstructure. This is analyzed using a multiple exponential time series expansion of S(q,Delta) in Delta, with wavevector dependent expansion coefficients. These coefficients are compared with predictions from several theoretical models for three types of stable emulsion, each differing in microstructure. The relationship between the nuclear magnetic resonance q-space measurements and bulk rheology for all three types of emulsion is also explored.
采用具有选择性激发的脉冲场梯度刺激回波技术来探测水在浓水包油乳液连续相中的扩散。回波幅度S(q,Δ)对波矢q和扩散时间Δ的依赖性表明，水扩散传播子对乳液微观结构敏感。利用S(q,Δ)在Δ中的多重指数时间序列展开来分析这一现象，展开系数与波矢有关。将这些系数与三种不同微观结构的稳定乳液的几种理论模型的预测结果进行了比较。还探讨了所有三种乳液的核磁共振q空间测量与本体流变学之间的关系。
