The Curvature Model for Mixed Surfactant Microemulsion Systems
Author | : Arti Suresh Bhakta |
Publisher | : |
Total Pages | : 99 |
Release | : 2007 |
ISBN-10 | : 0494400552 |
ISBN-13 | : 9780494400555 |
Rating | : 4/5 (555 Downloads) |
Download or read book The Curvature Model for Mixed Surfactant Microemulsion Systems written by Arti Suresh Bhakta and published by . This book was released on 2007 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this work were to develop a simple procedure to determine the hydrophilic/lipophilic nature of surfactants based on microemulsion phase behavior and to characterize mixed surfactant systems. The concept of hydrophilic-lipophilic difference (HLD) and the net-average curvature (NAC) were used to develop a model to characterize systems containing anionic-anionic and anionic-nonionic surfactant mixtures. Salinity and temperature scans were carried out and phase changes were noted. It was found that in anionic-anionic systems the linear mixing rule is applicable, and was used to calculate the intrinsic curvature parameter (Ci), which can be used as an alternative scale to the HLB and packing factor to characterize the behavior of a surfactant in microemulsion systems. For anionic-nonionic systems the linear mixing rule does not apply because of the interactions between anionic and nonionic surfactants which seem to be dominated by the charge shielding effect that nonionic surfactants have on anionic surfactants.