Polyelectrolyte-surfactant complexes on solid surface.
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.
Kundu
Sarathi
S
Laboratoire de Physique des Solides, Université Paris Sud, CNRS, UMR 8502, Orsay, France. sarathi@bose.res.in
D000818:Animals; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D002417:Cattle; D004247:DNA / Q000737:chemistry*; D004573:Electrolytes / Q000737:chemistry; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*
D004573:Electrolytes; D011108:Polymers; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents; D004247:DNA; C427203:calf thymus DNA; C022806:dodecyltrimethylammonium; D002266:Carboxymethylcellulose Sodium