CAJ | 학술논문

在298.2 K下，用吊环法测定了烷基二甲基苄基氯化铵水溶液的表面张力，结果表明，随着该类表面活性剂的疏水基链长从12增加到18个碳原子，其临界胶束浓度（CMC）从9.1 mmol/L降低至0.053 mmol/L；其在溶液表面的饱和吸附量（Γmax）减小，吸附效率（pC20）增大。还用电导率法研究了该类表面活性剂在不同温度下的CMC及胶束化热力学函数，在298.2~318.2 K，CMC随着温度的升高而增大；胶束形成的自由能0m?G 均为负值，表明该表面活性剂溶液胶束化过程是自发的；胶束形成的主要驱动力是熵。
재298.2 K하，용조배법측정료완기이갑기변기록화안수용액적표면장력，결과표명，수착해류표면활성제적소수기련장종12증가도18개탄원자，기림계효속농도（CMC）종9.1 mmol/L강저지0.053 mmol/L；기재용액표면적포화흡부량（Γmax）감소，흡부효솔（pC20）증대。환용전도솔법연구료해류표면활성제재불동온도하적CMC급효속화열역학함수，재298.2~318.2 K，CMC수착온도적승고이증대；효속형성적자유능0m?G 균위부치，표명해표면활성제용액효속화과정시자발적；효속형성적주요구동력시적。
By the ring method, the surface tension of alkyldimethylbenzylammonium chloride(BAC-n)was measured in aqueous solution at 298.2 K. The results show that the hydrophobic carbon chain lengths increase from 12 to 18, their CMCs decrease from 9.1 mmol/L to 0.053 mmol/L. Meanwhile the values of adsorption amount (Γmax ) decrease, and adsorption efficiency(pC20)increases. The critical micelle concentrations(CMCs)at the temperature range of 298.2 ~ 318.2 K were measured by the conductivity method, and the values of CMC of BAC-n increase with increasing the temperature. Furthermore, the thermodynamic functions of micellization were obtained. The values of micellization free energies( 0m?G )show negative sign, which means the process of micellization is a spontaneous process. And the process of micellization of BAC-n in aqueous solution is mainly driven by the entropy.