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3 results on '"Popescu MN"'

1. Exactly solvable model of monomer-monomer reactions on a two-dimensional random catalytic substrate.

Author

Oshanin G, Popescu MN, and Dietrich S

Subjects
Carbon Monoxide, Catalytic Domain, Models, Chemical, Models, Statistical, Oxygen chemistry, Substrate Specificity, Catalysis, Chemistry methods
Abstract

We study the equilibrium properties of a monomer-monomer A+B--> reaction on a two-dimensional substrate containing randomly placed catalytic bonds. Interacting A and B species undergo continuous exchanges with particle reservoirs and react as soon as a pair of unlike particles appears on sites connected by a catalytic bond. For annealed disorder in the placement of catalytic bonds the model is mapped onto a general spin S=1 model and solved exactly for the pressure in a particular case. At equal activities of the two species a second order phase transition is revealed.

Published
2004
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2. Capillary rise dynamics of aqueous glycerol solutions in glass capillaries: a critical examination of the Washburn equation

Author

Muireann O’Loughlin, Mihail N. Popescu, Craig Priest, John Ralston, K. Wilk, O'Loughlin, M, Wilk, K, Priest, C, Ralston, J, and Popescu, MN

Subjects
Aqueous solution, Washburn equation, Capillary action, capillary rise, Dynamics (mechanics), Analytical chemistry, glycerol-water mixtures, Thermodynamics, Critical examination, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, Biomaterials, Viscosity, chemistry.chemical_compound, Colloid and Surface Chemistry, chemistry, Washburn's equation, Glycerol, Physical Chemistry (incl. Structural, dynamic contact angle, Scaling
Abstract

The classic description of capillary rise given by the Washburn equation was recently questioned in the light of experimental evidence for a velocity dependent dynamic contact angle at a moving contact line. We present a systematic investigation of the capillary rise dynamics of glycerol and aqueous glycerol solutions in vertical glass capillaries of various radii. For pure glycerol, the results of our experiments are in almost perfect agreement with the predictions of the Washburn equation using independently measured values for the liquid and capillary parameters. For aqueous glycerol solutions we observe discrepancies between the theoretical expectations and the experimental results, which are increasing with the water content of the solution. A thorough analysis, combined with scaling arguments, allows us to conclude that dynamic contact angle effects alone cannot provide a consistent explanation for these discrepancies. Rather, they can be perfectly accounted for if the mixture flowing in the capillary would have an effective, increased viscosity (in respect to the nominal value). We suggest and briefly discuss various mechanisms that could contribute to this observed behavior. Refereed/Peer-reviewed

Published
2013

3. Cascade partial coalescence phenomena at electrolyte-oil interfaces and determination of bounds for the surface potential

Author

Zhenghe Xu, John Ralston, Mihail N. Popescu, Marta Krasowska, Jacob H. Masliyah, Natalie P. Kuznicki, P. M. F. Sellaperumage, Kuznicki, NP, Krasowska, M, Sellapperumage, PMF, Xu, Z, Masliyah, J, Ralston, J, and Popescu, MN

Subjects
Coalescence (physics), Surface (mathematics), Analytical chemistry, Absolute value, General Chemistry, Electrolyte, surfaces, Condensed Matter Physics, oil, Toluene, Physics::Fluid Dynamics, chemistry.chemical_compound, chemistry, Cascade, Chemical physics, Oil droplet, Physical Chemistry (incl. Structural, Physics::Chemical Physics, Event (particle physics)
Abstract

Small oil droplets (diameter

Published
2013

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