Pisárcik Martin, Rosen Milton J, Polakovicová Mária, Devínsky Ferdinand, Lacko Ivan
Department of Chemical Theory of Drugs, Faculty of Pharmacy, Comenius University, Kalinciakova 8, SK-83232 Bratislava, Slovakia.
J Colloid Interface Sci. 2005 Sep 15;289(2):560-5. doi: 10.1016/j.jcis.2005.03.092.
Areas per surfactant molecule at the liquid/hydrophobic solid (A(LS)) and the liquid/air (A(LA)) interface as a function of the spacer length are reported for cationic gemini surfactants having (CH2)n spacer s. A(LA) increases with increasing spacer length up to 6-8 CH2 groups in the spacer and then levels off. A(LS) values indicate a more closely packed arrangement of the surfactant molecules than that at the liquid/air interface. Comparison of A(LA) and A(LS) values indicates that the surfactant molecules at the liquid/hydrophobic solid interface are almost three times as closely packed as those at the liquid/air interface. A comparison of the experimental values of the area per surfactant molecule at both interfaces was made with those calculated from dimensions of the surfactant molecule in vacuo.
对于具有(CH2)n间隔基的阳离子双子表面活性剂，报告了在液/疏水固体(A(LS))和液/气(A(LA))界面处每个表面活性剂分子的面积随间隔基长度的变化情况。A(LA)随着间隔基长度增加而增大，直至间隔基中有6 - 8个CH2基团，然后趋于平稳。A(LS)值表明表面活性剂分子的排列比在液/气界面处更为紧密。A(LA)和A(LS)值的比较表明，在液/疏水固体界面处的表面活性剂分子排列紧密程度几乎是液/气界面处的三倍。将两个界面处每个表面活性剂分子面积的实验值与根据表面活性剂分子在真空中的尺寸计算得到的值进行了比较。
