Start
Apr 13, 2010 - 16:00
End
Apr 13, 2010 - 17:30
Venue
Creativity Hall (Room No 118)
Event Type
Speaker
Dr. Basavaraj M Gurappa Department of Chemical Engineering University of Delaware
Title
Self‐assembly of particles and surfactants
ABSTRACT: Understanding and controlling interactions between colloids surfactants polymers and their mixtures is important to design new materials and to tailor many emulations that are used in day-to-day life. In this talk effect of particle shape on structure thermodynamics and surface rheology of two dimensional (2D) suspensions will be discussed. We explore the effect of particle aspect ratio and surface chemistry on particle stabilized ‘Pickering’ emulsions. The results shed some light on the role of surface rheology of the particle film in emulsion stabilization. A part of the talk would also focus on surfactants which are active ingredients in many personal care products. Self-assembly of surfactants in solutions can lead to a number of structures such as spherical/warm-like micelles vesicles planar bilayers. We create metastable nanovesicles and develop a novel methodology to characterize their properties. A combination of techniques (SANS viscometry Cryo-TEM densitometry DLS and SAXS) is used to characterize the nanostructure of well-defined surfactant nano-vesicles (~ 15 nm in diameter). The method presented is demonstrated to completely characterize metastable dispersions of paucidisperse nanovesicles which is of considerable importance in the quantitative estimation of nanovesicle performance in various applications.About the speaker: Basavaraj M. Gurapap is currently a postdoctoral researcher in the group of Prof. Norman J. Wagner at the University of Delaware. After obtaining a Bachelor of engineering in Chemical Engineering from Bangalore University he received Master of Science by research degree from the faculty of engineering by working with Prof. Govid S. Gupta at Indian Institute of Science in 2003. He obtained his PhD in Chemical Engineering from KULeuven Belgium in 2008 working with Prof. Jan Vermant. His research interests include particles at interfaces surface and bulk rheology use of scattering techniques to characterize and understand colloidal dispersions.