The influence of chain length of n -alcohols such as 1-butanol, 1-pentanol, 1-hexanol and 1-heptanol on cationic dodecyl trimethyl ammonium bromide (DTAB) micelles has been investigated. The effect of concentration was determined at alcohol concentrations of (10, 20, 30, 40 and 50) mM and at temperatures of 298.15 K, 303.15 K, 308.15 K and 313.15 K using ultrasonic velocity, density, viscosity and conductivity measurements. To study molecular interactions in micelles of various mixtures of DTAB and n -alcohols by using acoustical parameters, such as adiabatic compres-sibility ( β ad ), intermicellar free length ( L f ), acoustic impedance ( Z ), molar volume ( V M ) have been calculated by using ultrasonic velocity ( U ) and density ( ρ ). With the help of the trends observed when varying these parameters, the molecular interactions and thus the micellar growth of mixed systems of DTAB and n –alcohol were discussed. Viscosity data such as absolute viscosity, viscous relaxation time, oil solubilization, foam stability and conductance data complemented the observed ultrasonic data.

中文翻译：

---

超声分析研究正醇对水性 DTAB 胶束的影响

研究了1-丁醇、1-戊醇、1-己醇和1-庚醇等正醇链长对阳离子十二烷基三甲基溴化铵(DTAB)胶束的影响。使用超声波速度、密度、粘度和电导率测量在 (10, 20, 30, 40 和 50) mM 的酒精浓度和 298.15 K、303.15 K、308.15 K 和 313.15 K 的温度下确定浓度的影响。利用绝热压缩性 (β ad )、胶束间自由长度 ( L f )、声阻抗 ( Z )、摩尔体积 ( VM ) 等声学参数研究 DTAB 和正醇的各种混合物胶束中的分子相互作用已通过使用超声速度 ( U ) 和密度 ( ρ ) 计算得出。借助改变这些参数时观察到的趋势，讨论了 DTAB 和正醇混合体系的分子相互作用以及胶束生长。诸如绝对粘度、粘性弛豫时间、油溶解度、泡沫稳定性和电导率数据等粘度数据补充了观察到的超声波数据。