Mercury

3) the size of molecules
• Small-sized surface active agents have better
wettability and permeability;
• Large-sized agents have better ablution ( 洗 涤
作 用 ) and dispersant effect ( 分 散 作 用 ).
e.g. the order of the ablution effectiveness of
alkyl sodium sulfate surface active agent is as
follows:
C 16 H 33 SO 4 Na> C 14 H 29 SO 4 Na> C 12 H 25 SO 4 Na
• Concerning wettability, it appears the
opposite.