Primary nucleation - Fig

…This nucleation phenomenon is affected by the cooling rate of the solution related to the degree of supersaturation, mechanical energy such as stirring, impurities present in the solution, and whether or not the same type of crystals as the crystals that precipitate are present. Nucleation that occurs when such crystals are not present is called primary nucleation, and when they are present is called secondary nucleation. Secondary nucleation occurs at a lower degree of supersaturation than that at which primary nucleation is observed, and in normal industrial equipment, the secondary nucleation phenomenon occurs predominantly. …

*Some of the terminology explanations that refer to "primary nucleation" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…この核化現象は，過飽和度と関連した溶液の冷却速度，かくはんなどの機械的エネルギー，溶液中に存在する不純物，析出する結晶と同種の結晶が存在するか否か等の影響を受ける。このような結晶が存在しないときに起こる核発生は一次核化，存在するときの現象は二次核化といわれる。二次核化は一次核化が認められるより小さな過飽和度で起こり，通常の工業装置内では，二次核化現象が支配的に起こる。…

※「一次核化」について言及している用語解説の一部を掲載しています。

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