Dynamic light scattering, interfacial properties, and conformational analysis of biodegradable quarternary ammonium surfactants.
Aggregation properties of biodegradable ammonium surfactants containing amide and ester groups in the bulk and at the air-water interface were investigated as a function of surfactant tail length m using dynamic light scattering and surface tension experimental methods. The results indicate that surfactants containing an ester group in the structure display higher aggregation ability in the volume and form more densely packed layer of molecules at the air-water interface than those with an amide group. The results of physical measurements were correlated with 3D models of respective surfactant molecules. As the results indicate, a surfactant molecule headgroup containing an ester group shows higher flexibility than that with an amide group in its structure, which is documented by somewhat smaller headgroup size and denser packing at the air-water interface.
Pisárcik
Martin
M
Department of Chemical Theory of Drugs, Faculty of Pharmacy, Comenius University, Kalinciakova 8, SK-83232 Bratislava, Slovakia. pisarcik@fpharm.uniba.sk
Polakovicová
Mája
M
Devínsky
Ferdinand
F
Lacko
Ivan
I
D000478:Alkylation; D008027:Light; D008958:Models, Molecular; D008968:Molecular Conformation; D010316:Particle Size; D000644:Quaternary Ammonium Compounds / Q000737:chemistry* / Q000378:metabolism*; D012996:Solutions; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry* / Q000378:metabolism*
D000644:Quaternary Ammonium Compounds; D012996:Solutions; D013501:Surface-Active Agents