表面活性剂：在添加量很低的情况下也能显著降低界面张力的物质。
Surfactant: in addition amount of low also can significantly reduce the interfacial tension of the material.
研究表明，在液滴表面张力及界面能的共同作用下，硅油液滴一般呈现中间厚边缘薄的不均匀分布；
Because of the surface tension effect and the interfacial energy of the oil drop, the oil thickness near the substrate edge is smaller than that of the center region of the sample.
实验结果证明，芳纶表面改性显著提高了其复合材料界面的粘结强度，相反却降低了其界面断裂能。
The results show that the interfacial adhesion strength increased noticeably for composites of active aramid fiber but the fracture energy of the interface decreased.
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