One of the two-phase separation processes in a two-component mixture. Considering the curve (a in the figure) of the free energy G and composition C of a two-component mixture with a positive enthalpy of mixing at a certain temperature T 0 , the two phases are stable against fluctuations at , but are unstable at . Therefore, the points on the G - C curve, i.e., the inflection points, are found and plotted on the two-phase separation curve (b in the figure). The locus of inflection points obtained by changing T 0 in a similar manner is called the spinodal curve (named by van der Waals). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
2成分混合系における2相分離過程の一つ。ある温度T0における混合エンタルピーが正である2成分混合系の自由エネルギーGと組成Cの曲線(図のa)を考えた場合,では2相はゆらぎに対し安定であるが,では不安定である。そこで,G‐C曲線上での点,すなわち変曲点を求め,これを2相分離曲線(図のb)にプロットし,同様な操作でT0を変化させて得られる変曲点の軌跡をスピノダル曲線(ファン・デル・ワールスの命名)という。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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