The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Alexander R Cruden - One of the best experts on this subject based on the ideXlab platform.
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rheology of petrolatum Paraffin Oil mixtures applications to analogue modelling of geological processes
Journal of Structural Geology, 2014Co-Authors: Joao C Duarte, Wouter Pieter Schellart, Alexander R CrudenAbstract:Paraffins have been widely used in analogue modelling of geological processes. Petrolatum and Paraffin Oil are commonly used to lubricate model boundaries and to simulate weak layers. In this paper, we present rheological tests of petrolatum, Paraffin Oil and several homogeneous mixtures of the two. The results show that petrolatum and all petrolatumeParaffin Oil mixtures are strain, strain rate and temperature dependent under typical experimental strain rates (10 � 3 e10 � 1 s � 1 ). For the same conditions, pure Paraffin Oil is a slightly temperature-dependent, linear, Newtonian fluid. All mixtures have yield stress and flow stress (strain softening) values that decrease with decreasing shear rate, and with increasing relative amounts of Paraffin Oil. The degree of strain rate dependence (shear thinning) also decreases with increasing Paraffin Oil content. Because these materials have rheologies that can be characterized and controlled, they are suitable for use in a large number of analogue model settings, either as a lubricant or to simulate weak layers. When used as a lubricant, mixtures with higher Paraffin Oil content should perform better than pure petrolatum.
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Rheology of petrolatum–Paraffin Oil mixtures: Applications to analogue modelling of geological processes
Journal of Structural Geology, 2014Co-Authors: Joao C Duarte, Wouter Pieter Schellart, Alexander R CrudenAbstract:Paraffins have been widely used in analogue modelling of geological processes. Petrolatum and Paraffin Oil are commonly used to lubricate model boundaries and to simulate weak layers. In this paper, we present rheological tests of petrolatum, Paraffin Oil and several homogeneous mixtures of the two. The results show that petrolatum and all petrolatumeParaffin Oil mixtures are strain, strain rate and temperature dependent under typical experimental strain rates (10 � 3 e10 � 1 s � 1 ). For the same conditions, pure Paraffin Oil is a slightly temperature-dependent, linear, Newtonian fluid. All mixtures have yield stress and flow stress (strain softening) values that decrease with decreasing shear rate, and with increasing relative amounts of Paraffin Oil. The degree of strain rate dependence (shear thinning) also decreases with increasing Paraffin Oil content. Because these materials have rheologies that can be characterized and controlled, they are suitable for use in a large number of analogue model settings, either as a lubricant or to simulate weak layers. When used as a lubricant, mixtures with higher Paraffin Oil content should perform better than pure petrolatum.
Francesca Ravera - One of the best experts on this subject based on the ideXlab platform.
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dynamic properties of span 80 adsorbed layers at Paraffin Oil water interface capillary pressure experiments under low gravity conditions
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017Co-Authors: P Pandolfini, G Loglio, Francesca Ravera, Libero Liggieri, V I Kovalchuk, Aliyar Javadi, Mohsen Karbaschi, J Kragel, R Miller, B A NoskovAbstract:Abstract Measurements by capillary pressure tensiometry, under microgravity conditions aboard the International Space Station, supplied a consistent set of reliable results for the dynamic interfacial tension and for the interfacial dilational viscoelastic modulus, quantitatively characterizing the dynamics of Span-80 adsorbed layers at the Paraffin-Oil/water interface. The experiments were executed at three different temperatures, i.e., 20, 30 and 40 °C, according to a pre-established built-in time-line in the orbiting facility. The interfacial area was subjected to perturbations with various functional forms (square pulses, ramps and harmonic oscillations), at three consecutive amplitudes (5%, 10% and 20%). Each experiment was performed in three successive repetitions, in view of an advantageous telemetered data redundancy. The interfacial responses to imposed perturbations, for the studied minimal surfactant concentration of Span-80 in Paraffin-Oil (that is (2 ÷ 3) × 10−5 mol/dm3) revealed a diffusion-controlled adsorption mechanism, definitely matching the Lucassen & Van den Tempel model in the frequency-domain representation. The interfacial responses also showed a linearity range up to the 20% amplitude. Interfacial relaxation responses to transient interfacial perturbations substantially validated the diffusion-controlled model for the adsorption mechanism, in the time-domain representation.
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interfacial rheology of span 80 adsorbed layers at Paraffin Oil water interface and correlation with the corresponding emulsion properties
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007Co-Authors: Eva Santini, Libero Liggieri, Linda Sacca, Daniele Clausse, Francesca RaveraAbstract:Abstract The correlation between the interfacial properties of the surfactant adsorbed layer at the water–Oil interface and the emulsification and stability of the corresponding emulsion has been investigated. To this aim an Oil soluble surfactant, sorbitane monooleate (Span 80), has been studied at the Paraffin Oil–water interface, together with the water in Oil emulsions stabilized by the same surfactant at the same bulk concentrations, above the cmc. The equilibrium and dynamic interfacial tension and the interfacial rheological properties have been measured by coupling two different tensiometers: a capillary pressure tensiometer (CPT) and a drop shape tensiometer. By this way the dilational viscoelasticity has been determined in a frequency range from 0.01 to 20 Hz. To investigate the emulsion properties, besides the observation by optical microscope, a differential scanning calorimeter (DSC) has been used which allows for the evaluation of the drop size distribution. The results show a correlation between the surfactant concentration and the emulsion properties, which can be explained on the basis of the dilational properties. For very concentrated solutions however the stabilizing effect of inverse micelles must be accounted for. Moreover, dilational properties have been found to be also important to determine emulsification conditions.
Joao C Duarte - One of the best experts on this subject based on the ideXlab platform.
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rheology of petrolatum Paraffin Oil mixtures applications to analogue modelling of geological processes
Journal of Structural Geology, 2014Co-Authors: Joao C Duarte, Wouter Pieter Schellart, Alexander R CrudenAbstract:Paraffins have been widely used in analogue modelling of geological processes. Petrolatum and Paraffin Oil are commonly used to lubricate model boundaries and to simulate weak layers. In this paper, we present rheological tests of petrolatum, Paraffin Oil and several homogeneous mixtures of the two. The results show that petrolatum and all petrolatumeParaffin Oil mixtures are strain, strain rate and temperature dependent under typical experimental strain rates (10 � 3 e10 � 1 s � 1 ). For the same conditions, pure Paraffin Oil is a slightly temperature-dependent, linear, Newtonian fluid. All mixtures have yield stress and flow stress (strain softening) values that decrease with decreasing shear rate, and with increasing relative amounts of Paraffin Oil. The degree of strain rate dependence (shear thinning) also decreases with increasing Paraffin Oil content. Because these materials have rheologies that can be characterized and controlled, they are suitable for use in a large number of analogue model settings, either as a lubricant or to simulate weak layers. When used as a lubricant, mixtures with higher Paraffin Oil content should perform better than pure petrolatum.
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Rheology of petrolatum–Paraffin Oil mixtures: Applications to analogue modelling of geological processes
Journal of Structural Geology, 2014Co-Authors: Joao C Duarte, Wouter Pieter Schellart, Alexander R CrudenAbstract:Paraffins have been widely used in analogue modelling of geological processes. Petrolatum and Paraffin Oil are commonly used to lubricate model boundaries and to simulate weak layers. In this paper, we present rheological tests of petrolatum, Paraffin Oil and several homogeneous mixtures of the two. The results show that petrolatum and all petrolatumeParaffin Oil mixtures are strain, strain rate and temperature dependent under typical experimental strain rates (10 � 3 e10 � 1 s � 1 ). For the same conditions, pure Paraffin Oil is a slightly temperature-dependent, linear, Newtonian fluid. All mixtures have yield stress and flow stress (strain softening) values that decrease with decreasing shear rate, and with increasing relative amounts of Paraffin Oil. The degree of strain rate dependence (shear thinning) also decreases with increasing Paraffin Oil content. Because these materials have rheologies that can be characterized and controlled, they are suitable for use in a large number of analogue model settings, either as a lubricant or to simulate weak layers. When used as a lubricant, mixtures with higher Paraffin Oil content should perform better than pure petrolatum.
Libero Liggieri - One of the best experts on this subject based on the ideXlab platform.
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dynamic properties of span 80 adsorbed layers at Paraffin Oil water interface capillary pressure experiments under low gravity conditions
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017Co-Authors: P Pandolfini, G Loglio, Francesca Ravera, Libero Liggieri, V I Kovalchuk, Aliyar Javadi, Mohsen Karbaschi, J Kragel, R Miller, B A NoskovAbstract:Abstract Measurements by capillary pressure tensiometry, under microgravity conditions aboard the International Space Station, supplied a consistent set of reliable results for the dynamic interfacial tension and for the interfacial dilational viscoelastic modulus, quantitatively characterizing the dynamics of Span-80 adsorbed layers at the Paraffin-Oil/water interface. The experiments were executed at three different temperatures, i.e., 20, 30 and 40 °C, according to a pre-established built-in time-line in the orbiting facility. The interfacial area was subjected to perturbations with various functional forms (square pulses, ramps and harmonic oscillations), at three consecutive amplitudes (5%, 10% and 20%). Each experiment was performed in three successive repetitions, in view of an advantageous telemetered data redundancy. The interfacial responses to imposed perturbations, for the studied minimal surfactant concentration of Span-80 in Paraffin-Oil (that is (2 ÷ 3) × 10−5 mol/dm3) revealed a diffusion-controlled adsorption mechanism, definitely matching the Lucassen & Van den Tempel model in the frequency-domain representation. The interfacial responses also showed a linearity range up to the 20% amplitude. Interfacial relaxation responses to transient interfacial perturbations substantially validated the diffusion-controlled model for the adsorption mechanism, in the time-domain representation.
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interfacial rheology of span 80 adsorbed layers at Paraffin Oil water interface and correlation with the corresponding emulsion properties
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007Co-Authors: Eva Santini, Libero Liggieri, Linda Sacca, Daniele Clausse, Francesca RaveraAbstract:Abstract The correlation between the interfacial properties of the surfactant adsorbed layer at the water–Oil interface and the emulsification and stability of the corresponding emulsion has been investigated. To this aim an Oil soluble surfactant, sorbitane monooleate (Span 80), has been studied at the Paraffin Oil–water interface, together with the water in Oil emulsions stabilized by the same surfactant at the same bulk concentrations, above the cmc. The equilibrium and dynamic interfacial tension and the interfacial rheological properties have been measured by coupling two different tensiometers: a capillary pressure tensiometer (CPT) and a drop shape tensiometer. By this way the dilational viscoelasticity has been determined in a frequency range from 0.01 to 20 Hz. To investigate the emulsion properties, besides the observation by optical microscope, a differential scanning calorimeter (DSC) has been used which allows for the evaluation of the drop size distribution. The results show a correlation between the surfactant concentration and the emulsion properties, which can be explained on the basis of the dilational properties. For very concentrated solutions however the stabilizing effect of inverse micelles must be accounted for. Moreover, dilational properties have been found to be also important to determine emulsification conditions.
B A Noskov - One of the best experts on this subject based on the ideXlab platform.
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dynamic properties of span 80 adsorbed layers at Paraffin Oil water interface capillary pressure experiments under low gravity conditions
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017Co-Authors: P Pandolfini, G Loglio, Francesca Ravera, Libero Liggieri, V I Kovalchuk, Aliyar Javadi, Mohsen Karbaschi, J Kragel, R Miller, B A NoskovAbstract:Abstract Measurements by capillary pressure tensiometry, under microgravity conditions aboard the International Space Station, supplied a consistent set of reliable results for the dynamic interfacial tension and for the interfacial dilational viscoelastic modulus, quantitatively characterizing the dynamics of Span-80 adsorbed layers at the Paraffin-Oil/water interface. The experiments were executed at three different temperatures, i.e., 20, 30 and 40 °C, according to a pre-established built-in time-line in the orbiting facility. The interfacial area was subjected to perturbations with various functional forms (square pulses, ramps and harmonic oscillations), at three consecutive amplitudes (5%, 10% and 20%). Each experiment was performed in three successive repetitions, in view of an advantageous telemetered data redundancy. The interfacial responses to imposed perturbations, for the studied minimal surfactant concentration of Span-80 in Paraffin-Oil (that is (2 ÷ 3) × 10−5 mol/dm3) revealed a diffusion-controlled adsorption mechanism, definitely matching the Lucassen & Van den Tempel model in the frequency-domain representation. The interfacial responses also showed a linearity range up to the 20% amplitude. Interfacial relaxation responses to transient interfacial perturbations substantially validated the diffusion-controlled model for the adsorption mechanism, in the time-domain representation.
