Laboratoire de Physique des Solides, Université Paris Sud, CNRS, UMR 8502, Orsay, France.
J Colloid Interface Sci. 2010 Apr 15;344(2):547-55. doi: 10.1016/j.jcis.2009.12.038. Epub 2009 Dec 28.
Polyelectrolyte-surfactant complexes have been deposited on hydrophilic silicon substrates by using a horizontal deposition technique. DNA and carboxymethyl cellulose (carboxyMC) were used as short and long polyelectrolyte and dodecyltrimethylammonium bromide (DTAB) was used as water-soluble surfactant. Varying the surfactant concentration, the structural and morphological information have been obtained for these polyelectrolyte-surfactant complexes. Morphology and out-of-plane structures have been obtained by atomic force microscopy and X-ray reflectivity studies. Electron density profiles obtained from the reflectivity study show that DNA-DTAB complexes form lamellar like multilayered structure but carboxyMC-DTAB complexes form coil-like structure. At lower DTAB concentration, these DNA-DTAB and carboxyMC-DTAB complexes form Gibbs layer, whereas at higher surfactant concentration, DTAB molecules themselves form lamellar like multilayered structure that coexists with the structure formed by the complexes.
通过水平沉积技术，在亲水硅衬底上沉积了聚电解质-表面活性剂复合物。DNA 和羧甲基纤维素（羧基 MC）分别用作短链和长链聚电解质，十二烷基三甲基溴化铵（DTAB）用作水溶性表面活性剂。通过改变表面活性剂浓度，获得了这些聚电解质-表面活性剂复合物的结构和形态信息。原子力显微镜和 X 射线反射率研究获得了形貌和面外结构。反射率研究得到的电子密度分布表明，DNA-DTAB 复合物形成层状多层结构，而羧基 MC-DTAB 复合物形成类似线圈的结构。在较低的 DTAB 浓度下，这些 DNA-DTAB 和羧基 MC-DTAB 复合物形成吉布斯层，而在较高的表面活性剂浓度下，DTAB 分子本身形成类似层状的多层结构，与复合物形成的结构共存。
