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Use of NMR imaging to measure interfacial properties of asphalts

机译：使用NMR成像测量沥青的界面特性

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An NMR imaging method that allows for direct calculation of interfacial surface tensions of asphalts is described. The method is based upon acquiring NMR images of water drops on the surface of asphalt as a function of time. By expressing the contact angle for the water drop either in terms of Young's equation, or the liquid lens equation for the initial placement of the water drop on the asphalt surface, and for a later time when the water drop has penetrated below the asphalt surface, two equations that incorporate the asphalt-air surface and asphalt-water interfacial tensions are obtained which can be solved analytically. The NMR imaging method was used to determine the surface tensions of the eight Strategic Highway Research Program (SHRP) core asphalts at 25 deg C. Asphalt-water interfacial tension values ranged from 25 to 40 dynes/cm, and asphalt-air surface tension values ranged from about 38-50 dynes/cm. These results are in general agreement with other asphalt surface tension measurements that have been made using the du Nouy ring tensiometer, or the Wilhelmy Plate method. Spreading coefficients and capillary numbers derived from the surface tension calculations are also reported.
机译：描述了一种NMR成像方法，该方法可以直接计算沥青的界面张力。该方法基于获取沥青表面随时间变化的NMR图像。通过用杨氏方程式或水滴在沥青表面初始放置的液镜方程式表示水滴的接触角，以及在水滴渗入沥青表面以下的情况下表达水滴的接触角，得到了包含沥青-空气表面张力和沥青-水界面张力的两个方程，可以通过解析来求解。 NMR成像方法用于确定25摄氏度时八种战略公路研究计划（SHRP）核心沥青的表面张力。沥青-水界面张力值介于25到40达因/厘米，并且沥青-空气表面张力值范围为约38-50达因/厘米。这些结果与使用du Nouy环张力计或Wilhelmy Plate方法进行的其他沥青表面张力测量总体上是一致的。还报道了由表面张力计算得出的扩散系数和毛细管数。

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