Chengbin Huang, Qiuxiao Li, Ming Li, Jinpin Niu, Yongbo Song
November 17, 2014
Guerbet hexadecyl sulfate (C 16 GS) was synthesized by sulfating Guerbet hexadecyl alcohol (C 16 GA) with SO 3 as the sulfating agent and dichloroethane as the solvent. The structure of C 16 GS and C 16 GA was confirmed by IR and NMR. Their surface tension, wetting, emulsifying and foaming properties were tested and compared with that of sodium dodecyl sulfate (SDS). It is found that C 16 GS shows better surface activity than SDS, with both the critical micelle concentration (CMC) and surface tension at CMC (γ CMC ) of C 16 GS lower than that of SDS. Contact angle data demonstrated that C 16 GS exhibits better wetting ability on Teflon surface than SDS. As concentration increases, both the contact angle of C 16 GS and SDS decreases first and then remains constant. The only exception is the 0 s contact angle of C 16 GS decreases first and then increases. The contact angle of SDS becomes the smallest and reaches a plateau at the concentration of CMC. However, the contact angle of C 16 GS reaches the smallest and levels off at the concentration of 2.5 g/L which is much higher than the CMC of C 16 GS. C 16 GS also has a better performance of emulsifying soybean oil and paraffin than SDS. As for the foaming property, C 16 GS has a similar foamability to SDS, but shows worse foam stability than SDS.