Håkansson B, Pons R, Söderman O
Division of Physical Chemistry 1, Lund University, Sweden.
Magn Reson Imaging. 1998 Jun-Jul;16(5-6):643-6. doi: 10.1016/s0730-725x(98)00034-4.
Diffraction-like effects have been observed by applying pulsed field gradient (PFG) nuclear magnetic resonance (NMR) to a highly concentrated water-in-oil (W/O) emulsion, made up of the nonionic surfactant C12E4 [CH3(CH2)11(OCH2CH2)4OH], n-decane, and brine [1 wt% NaCl(aq) solution]. The pulsed field gradient NMR data show one pronounced maximum and the shoulder of a second maximum in the attenuation curve of the NMR signal from water, the so-called Bragg interference peaks. From the diffraction-like peaks, the average distance (center to center) between the emulsion droplets can be obtained, in this case related to the average size of an emulsion droplet. Furthermore, we note that the long-term stability of the emulsion can be followed by pulsed field gradient NMR.
通过将脉冲场梯度（PFG）核磁共振（NMR）应用于由非离子表面活性剂C12E4 [CH3(CH2)11(OCH2CH2)4OH]、正癸烷和盐水[1 wt% NaCl(aq)溶液]组成的高浓度油包水（W/O）乳液，观察到了类似衍射的效应。脉冲场梯度NMR数据显示，来自水的NMR信号衰减曲线中有一个明显的最大值和第二个最大值的肩部，即所谓的布拉格干涉峰。从类似衍射的峰中，可以获得乳液液滴之间的平均距离（中心到中心），在这种情况下与乳液液滴的平均尺寸有关。此外，我们注意到，可以通过脉冲场梯度NMR跟踪乳液的长期稳定性。
