R
Ronald Marquez
Researcher at University of Los Andes
Publications - 22
Citations - 344
Ronald Marquez is an academic researcher from University of Los Andes. The author has contributed to research in topics: Drop (liquid) & Microemulsion. The author has an hindex of 7, co-authored 21 publications receiving 174 citations. Previous affiliations of Ronald Marquez include North Carolina State University & University of the Andes.
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Extended Surfactants Including an Alkoxylated Central Part Intermediate Producing a Gradual Polarity Transition—A Review of the Properties Used in Applications Such as Enhanced Oil Recovery and Polar Oil Solubilization in Microemulsions
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Instability of Emulsions Made with Surfactant–Oil–Water Systems at Optimum Formulation with Ultralow Interfacial Tension
TL;DR: It is shown that the interfacial compression elastic modulus and viscosity also exhibit a minimum at optimum formulation, and it is proposed that this minimum is related to the acceleration of the surfactant exchanges between the interface, oil and water, near the optimum formulation.
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Interfacial rheology of low interfacial tension systems using a new oscillating spinning drop method.
TL;DR: A new type of instrument based on spinning drop oscillations is used, allowing to extend the interfacial rheology studies to low and ultralow interfacial tension systems, and the data shown for low interfacial tensions are the first reported in the literature.
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How to Use the Normalized Hydrophilic-Lipophilic Deviation (HLDN) Concept for the Formulation of Equilibrated and Emulsified Surfactant-Oil-Water Systems for Cosmetics and Pharmaceutical Products
TL;DR: In this paper, a semi-empirical formulation of the hydrophilic-lipophilic deviation (HLD) from optimum formulation is proposed, which integrates in a simple linear relationship the effects of six to eight variables including surfactant head and tail, sometimes a cosurfactant, oil-phase nature, aqueous-phase salinity, temperature, and pressure.
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Breaking of Water-In-Crude Oil Emulsions. Part 9. New Interfacial Rheology Characteristics Measured Using a Spinning Drop Rheometer at Optimum Formulation
TL;DR: Water-crude oil interfaces often exhibit a viscoelastic layer with a high mechanical resistance, consisting of natural surfactants in crude oil, mainly asphaltenes, which stabilize water-in-oil emu....