摘要
通过用滴体积法对合成纯化所得 N-烷基 - N,N,N-三羟乙基氯化铵 ( AEEC)表面张力测定发现 ,AEEC的表面过剩浓度随疏水基碳链数的增加而有所减小 ,表面分子面积受碳链长度影响 ;疏水基碳链的增加使 AEEC降低表面张力的效能和效率都提高 ;随着疏水基碳链的增加 ,AEEC的 CMC降低。并且在所测定的温度范围内 ,log CMC与疏水基碳链长度成线性关系。在 2 5°C时 ,TΔSomic对 ΔGomic的贡献比 ΔHomic大 ,并且碳链愈长 TΔSomic的贡献愈大 ,AEEC胶束化的主要驱动力是熵变。
The suface tension of N alky N,N,N trihydroxyethyl ammonium chloride (AEEC) synthesized and purified in this work was determined by drop volume method. It was found that the surface excessive concentration of AEEC was decreased with the increase of carbon number of the hydrophobic group. The AEEC's molecular surface area at the surface of aqueous solution was affected by the hydrophobic group. The effectiveness and efficiency of AEEC in decreasing surface tension was increased with the increase of carbon number. The log CMC is proportional to the carbon number. At 25 °C , entropy change is the main drive force for the micelle formation of AEEC.
出处
《化学世界》
CAS
CSCD
北大核心
2002年第11期595-598,共4页
Chemical World
