论文部分内容阅读
有关表面活性的基本概念1.什么叫“相”在药剂学上经常可以遇到“相”这一名词。相是物质体系中的均匀物质;它必须具有:(1)相同组成;(2)相同物理性质;(3)相同化学性质。不论是单质、化合物或混合物,只要具有上述的三个相同性质,就是同一相的物质。反之,如果具有一个、两个或三个不相同的条件存在,那么就不能属于同一相。例如,空气虽然是混合物,但由于内部均匀,所以是一个相。水、冰、水蒸气三者,虽组成同为 H_2O,但因物理性质不同,所以分属三个相。2.表面和界面
The basic concept of surface activity 1. What is the “phase” in pharmacy can often encounter “phase ” the term. The phase is a homogeneous material in the material system; it must have: (1) the same composition; (2) the same physical properties; and (3) the same chemical properties. Whether a simple substance, a compound or a mixture, as long as it has the above three same properties, it is the substance of the same phase. Conversely, if one, two or three different conditions exist, then they can not belong to the same phase. For example, although the air is a mixture, it is a phase because the interior is uniform. Water, ice, steam three, although composed of the same H_2O, but because of different physical properties, so belong to three phases. 2 surface and interface