SDS/正丁醇/正庚烷/水微乳液稳定性分析及应用

Stability analysis and application of SDS/n-butanol/n-heptanel/water microemulsion system

研究了十二烷基硫酸钠(SDS)/正丁醇/正庚烷/水(或氯化镁与硝酸铝混合水溶液或氢氧化钠溶液)四组分形成稳定微乳液的条件。考察了表面活性剂与助表面活性剂的质量比、温度、pH值、盐浓度对该体系稳定性的影响及水与表面活性剂的摩尔比(ωo)对水核粒径的影响。结果表明,m(SDS)∶m(正丁醇)=4∶6时,反相微乳液最稳定,对温度变化不敏感,pH值为7～13时,具有较好的稳定性,随着镁铝混合盐溶液浓度的增加,反相微乳区域急剧缩小,水核粒径随着ωo增大而增大,在稳定微乳液区域内制备了分布较均匀,尺寸范围30～70 nm的粒状纳米颗粒。

The formation of microemulsion system of sodium dodecyl sulfate （SDS）/n-butanol/n-hepta- nel/water [ or MgCl2 ·6H2O and Al（ NO3 ）3·9H2O mixed aqueous solution or NaOH solution] were studied. The influences of the mass ratio of surfactant to assistant, temperature, pH value and salinity to the systems and the influences of the molar ratio of water to surfactant（tOo） to the sizes of the micelles were investigated. It was found that m（SDS）： m（n-butanol） was 4：6 ,the microemulsion system was stable phase regions,which was insensitive for temperatures and not changed with pH value from 7 to 13 ,but the stable phase region of the microemulsion became smaller with increasing salinity （ Mg, Al sultion）. The sizes of the micelles increased with increasing tOo. Nano-particles were prepared in the stable phase regions and had a narrow size distribution, the sizes were from 30 nm to 70 rim.