Paper Number
PO62
Session
Poster Session
Title
Rheology of concentrated nanoemulsions with different volume fractions
Presentation Date and Time
October 23, 2019 (Wednesday) 6:30
Track / Room
Poster Session / Ballroom C on 4th floor
Authors
- Salimi-Kenari, Hamed (New Mexico State University, Department of Chemical and Materials Engineering)
- Abbasian Chaleshtari, Zahra (New Mexico State University, Department of Chemical and Materials Engineering)
- Foudazi, Reza (New Mexico State University, Department of Chemical and Materials Engineering)
Author and Affiliation Lines
Hamed Salimi-Kenari, Zahra Abbasian Chaleshtari, and Reza Foudazi
Department of Chemical and Materials Engineering, New Mexico State University, Las Cruces, NM 88003
Speaker / Presenter
Salimi-Kenari, Hamed
Text of Abstract
The aim of this work is to evaluate the colloidal gelation of silicone oil in aqueous solutions containing sodium dodecyl sulfate (SDS) and poly(ethylene glycol)-diacrylate (PEGDA). Therefore, we investigate the rheological response of the nanoemulsions with different volume fraction by using simple and oscillatory shear flows. It is observed that the liquid nanoemulsions transformed into viscoelastic gels at 25% of oil volume fraction, ?. The apparent viscosity, yield stress, and storage modulus of the nanogels increase with oil volume fraction up to 45% of oil volume fraction. The storage modulus rapidly increases at the onset of gelation, followed by a gradual increase at higher ?. Weakening in gelation due to oscillatory structural forces takes place at volume fraction higher than 45%. The structural forces are present due to the layered-structuring of excess micelles in the interdroplet regions resulting in loss of droplet aggregation. The nanoemulsion gels developed could be used in low-fat foods, pharmaceuticals, and cosmetics products.