Journal ArticleDOI
Microstructure and dynamics of the water-in-oil CTAB/n-pentanol/n-hexane/water microemulsion: A spectroscopic and conductivity study
Mauro Giustini,Gerardo Palazzo,and Giuseppe Colafemmina,Mario Della Monica,Marcello Giomini,Andrea Ceglie +5 more
TLDR
In this article, the conductivity behavior of a quaternary water-in-oil microemulsion of a cationic surfactant (cetyltrimethylammonium bromide, CTAB), n-hexane, water, and n-pentanol has been investigated using conductivity, quasi-elastic light scattering, near-infrared absorption spectroscopy, and pulsed field gradient spin-echo NMR measurements.Abstract:
Quaternary water-in-oil microemulsion of a cationic surfactant (cetyltrimethylammonium bromide, CTAB), n-hexane, water, and n-pentanol has been investigated using conductivity, quasi-elastic light scattering, near-infrared absorption spectroscopy, and pulsed field gradient spin-echo NMR measurements The conductivity behavior shows features characteristic of the migration of charged droplets Consequently, using the charge fluctuation model, the conductivity data were correlated with the droplet radius obtained from self-diffusion coefficients for different obstruction factors Conductivity and self-diffusion measurements were found to be self-consistent for spherical droplets with hard-sphere interactions Comparison between collective diffusion and self-diffusion coefficients fully supports this conclusion The average head-group area of CTAB, the amount of water free in the organic bulk, and the fraction of alcohol present into the aggregates were evaluated together with the thickness of both the interread more
Citations
More filters
Journal ArticleDOI
Microemulsion-based media as novel drug delivery systems
M. Jayne Lawrence,Gareth D. Rees +1 more
TL;DR: The use of microemulsions and closely related microemulsion-based systems as drug delivery vehicles is reviewed, with particular emphasis being placed on recent developments and future directions.
Journal ArticleDOI
Confinement or the nature of the interface? Dynamics of nanoscopic water.
TL;DR: The results demonstrate that confinement by an interface to form a nanoscopic water pool is a primary factor governing the dynamics ofnanoscopic water rather than the presence of charged groups at the interface.
Journal ArticleDOI
Phenolic acids enzymatic lipophilization.
TL;DR: A panorama of the advances in the esterification of phenolic acids with fatty alcohol enhances their hydrophobicity and results in a multifunctional amphiphilic molecule is presented.
Journal ArticleDOI
Synthesis and Characterization of CdS Nanoclusters in a Quaternary Microemulsion: the Role of the Cosurfactant
Maria Lucia Curri,Angela Agostiano,and Liberato Manna,Mario Della Monica,Massimo Catalano,Luca Chiavarone,and Vincenzo Spagnolo,Mario Lugarà +7 more
TL;DR: In this article, a novel synthetic medium has been exploited, consisting of a quaternary CTAB/n-pentanol/nhexane/water microemulsion, allowing the simultaneous modulation of the water droplets dimensions and their exchange dynamics.
Journal ArticleDOI
Structural characterisation of water-Tween 40/Imwitor 308-isopropyl myristate microemulsions using different experimental methods.
TL;DR: The ability to determine type and structure of such microemulsion systems could enable partitioning and release rates of drugs from microemulsions to be predicted and to confirm the prediction of a percolation transition to a bicontinuous structure.
References
More filters
Journal ArticleDOI
Restricted Self‐Diffusion of Protons in Colloidal Systems by the Pulsed‐Gradient, Spin‐Echo Method
J. E. Tanner,E. O. Stejskal +1 more
TL;DR: The pulsed gradient, spin-echo technique has been used to study self-diffusion of protons in several colloidal systems in order to examine the usefulness of that technique in determining the extent to which the free movement of molecules in these systems is restricted by the colloidal structures present as discussed by the authors.