Wydział Chemii

K. Zielińska

Kazimiera A. Wilk

Adam Jezierski

Teofil Jesionowski

2008

Journal of Colloid and Interface Science

321

408-417

10.1016/j.jcis.2008.02.016

Naukowa

Angielski

Artykuł

Significant efforts were undertaken to characterize the microstructure and structural properties of water-in-oil (w/o), oil-in-water (o/w), and bicontinuous (bc) microemulsions composed of N-alkyl-N-methylgluconamides (n-alkyl = n-C₁₂H₂₅, n-C₁₄H₂₉, n-C₁₆H₃₃) and n-alcohols (ethanol, n-propanol, n-butanol) or iso-alcohols (iso-propanol, iso-butanol) as cosurfactants, as well as iso-octane and water. The internal structure of so created four-component system was elucidated by means of an analysis of isotropic area magnitudes in phase diagrams and conductivity measurements. Dynamic light scattering (DLS) measurements provided the microemulsion size and polydispersity. Polarity and viscosity of microemulsion microenvironment were acquired by means of electron paramagnetic resonance (EPR), UV–vis absorption spectroscopy (in the case of w/o droplets), and steady-state fluorescence (SSF) (in the case of o/w droplets). The results show that both the surfactant and the cosurfactant types affect the shape and extent of microemulsions. The size of droplets depends strongly on the type of examined microemulsion and the type of cosurfactant (linear or brunched) but is almost independent of the length of the surfactant alkyl chain. The size of microemulsion droplets ranges from 8.1 to 22.6 nm and from 3.7 to 14.3 nm respectively, for o/w and o/w microemulsions, making them good candidates for both template-based reactions and household components solubilizing media.

o/w and w/o Microemulsions, Phase diagram, Glucose-derived surfactant, Light scattering technique, Microenvironment polarity, Spin probe technique

https://doi.org/10.1016/j.jcis.2008.02.016

http://www.elsevier.com