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Dynamics of liquid interfaces under various types of external perturbations
, Article Current Opinion in Colloid and Interface Science ; Vol. 19, issue. 4 , Aug , 2014 , p. 309-319 ; Karbaschi, M ; Javadi, A ; Mucic, N ; Kragel, J ; Kovalchuk, V. I ; Rubio, R. G ; Fainerman, V. B ; Miller, R ; Sharif University of Technology
Abstract
Dynamic interfacial parameters are the key properties of interfaces in many modern technologies and can be studied in various ways. For applications like foams and emulsions, the dynamics of adsorption and the dilational and shear rheology of liquid-fluid interfaces are investigated most frequently. This work gives an insight into recently developed new experimental approaches, such as fast capillary pressure tensiometry for growing and oscillating drops. These experiments are presented in comparison to more classical techniques like drop profile tensiometry and capillary wave damping. Progress in these experiments based on generated interfacial perturbations can be expected only by a close...
Drop profile analysis tensiometry under highly dynamic conditions
, Article Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 413 , 2012 , Pages 292-297 ; 09277757 (ISSN) ; Bastani, D ; Javadi, A ; Kovalchuk, V. I ; Kovalchuk, N. M ; Makievski, A. V ; Bonaccurso, E ; Miller, R ; Sharif University of Technology
2012
Abstract
Profile analysis tensiometry (PAT) is presently the most frequently used technique for measuring surface tensions of liquids. The basis of this methodology is however an equilibrium force balance as given by the Gauss-Laplace equation. Therefore, its application under dynamic conditions, i.e. for growing drops or bubbles, is questionable. We discuss the limits of the applicability of PAT under dynamic conditions by using a growing drop configuration equipped with a high speed video camera. The systems studied are the water/air and water/hexane interface. The obtained "dynamic" drop profiles are analyzed by fitting the classical Gauss-Laplace equation. The results are additionally compared...
The Dynamic Interfacial Phenomena Investigations on Mobile Fluid Surfaces: Experimental Studies and CFD Simulations
, Ph.D. Dissertation Sharif University of Technology ; Bastani, Dariush (Supervisor) ; Miller, Reinhard (Co-Advisor) ; Yar Javadi, Ali (Co-Advisor)
Abstract
Understanding the hydrodynamic and physical chemistry basis of surface phenomena is very important for many branches of basic science like Chemical Engineering, Mechanics, Space Engineering, and Material Engineering in the level of fundamental studies and applications. In addition to the common technologies, the role of surface phenomena in novel technologies is also very essential. For example, nanotechnology, chemical or physical sensors, or micro electrical systems in which surface phenomena is playing a main role. Therefore, understanding the basis of surface science is very important for any development in many industrial and fundamental studies. The main topic of this thesis which is a...
Mixed protein-surfactant adsorption layers formed in a sequential and simultaneous way at water-air and water-oil interfaces
, Article Soft Matter ; Volume 8, Issue 22 , 2012 , Pages 6057-6065 ; 1744683X (ISSN) ; Kotsmar, C ; Ferri, J. K ; Javadi, A ; Karbaschi, M ; Krägel, J ; Wüstneck, R ; Miller, R ; Sharif University of Technology
2012
Abstract
Mixed protein-surfactant adsorption layers can be built up in two different ways. The classical way is when all components adsorb simultaneously from a mixed solution. Alternatively, the components adsorb one after another, i.e. in a sequential way. In the present work, the formation of such surface layers has been studied with the random coil protein β-casein in the presence of added anionic surfactant SDS and compared for two different interfaces: the water-air (W-A) and water-hexane (W-H) interfaces. The used experimental technique is a drop profile analysis tensiometer PAT-1 specially equipped with a coaxial double capillary for drop volume exchange during the experiments. The results...