Nizri G, Magdassi S, Schmidt J, Cohen Y, Talmon Y
Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Langmuir. 2004 May 25;20(11):4380-5. doi: 10.1021/la0364441.
We have studied the nano- and microparticles formed by complexation of PDAC [poly(diallyldimethyl-ammoniumchloride)] and SDS (sodium dodecyl sulfate). The complexation phenomenon was characterized by light scattering and zeta-potential measurements. The nature of the complexes was revealed by direct-imaging cryogenic temperature transmission electron microscopy (cryo-TEM), showing nanometric details of the complexes formed around the point of neutralization. The images also reveal how those aggregates are solubilized by excess surfactant, first into faceted particles with threadlike micelles attached to their surfaces, prior to complete solubilization, then into lacelike aggregates, and finally into spheroidal micelles. The nanostructure of the complexes strongly suggests they are made of a hexagonal liquid crystalline phase. This was further supported by small-angle X-ray scattering (SAXS).
我们研究了由聚二烯丙基二甲基氯化铵（PDAC）与十二烷基硫酸钠（SDS）络合形成的纳米和微粒。通过光散射和ζ电位测量对络合现象进行了表征。通过直接成像低温透射电子显微镜（cryo-TEM）揭示了络合物的性质，显示了在中和点周围形成的络合物的纳米级细节。图像还揭示了这些聚集体是如何被过量的表面活性剂溶解的，首先溶解成表面附着有丝状胶束的多面体颗粒，在完全溶解之前，然后溶解成花边状聚集体，最后溶解成球状胶束。络合物的纳米结构强烈表明它们是由六方液晶相构成的。小角X射线散射（SAXS）进一步证实了这一点。
