Poly(N-isopropylacrylamide) Microgels at the Oil−Water Interface: Interfacial Properties as a Function of Temperature

Langmuir ◽  
2010 ◽  
Vol 26 (17) ◽  
pp. 13839-13846 ◽  
Author(s):  
Cécile Monteux ◽  
Claire Marlière ◽  
Pauline Paris ◽  
Nadège Pantoustier ◽  
Nicolas Sanson ◽  
...  
Keyword(s):  
Interfacial Properties ◽  
Water Interface ◽  
Oil Water

Adsorption Kinetics and Rheological Interfacial Properties of Plant Proteins at the Oil−Water Interface

2004 ◽  
Vol 5 (6) ◽  
pp. 2088-2093 ◽  
Author(s):  
V. Ducel ◽  
J. Richard ◽  
Y. Popineau ◽  
F. Boury
Keyword(s):  
Adsorption Kinetics ◽  
Interfacial Properties ◽  
Water Interface ◽  
Plant Proteins ◽  
Oil Water

scholarly journals A Complete experimental study of oil/water interfacial properties in the presence of TiO2 nanoparticles and different ions

2019 ◽  
Vol 74 ◽  
pp. 39 ◽  
Author(s):  
Ali Khalilnezhad ◽  
Hosein Rezvani ◽  
Parastoo Ganji ◽  
Yousef Kazemzadeh
Keyword(s):  
Contact Angle ◽  
Zeta Potential ◽  
Interfacial Properties ◽  
Optimum Concentration ◽  
Viscosity Reduction ◽  
Wettability Alteration ◽  
Batch Adsorption ◽  
Water Interface ◽  
Oil Viscosity ◽  
Oil Water

Previous studies on Nanoparticles (NPs) application for Enhanced Oil Recovery (EOR) methods have revealed their effective role in the rock wettability alteration, relative Interfacial Tension (IFT) and oil viscosity reduction, formation and stabilization of the emulsions, and reduced asphaltene precipitation, which are all in direct relationship with oil/water interfacial properties. This study focuses on the interfacial properties of oil/water in the presence of Titania NPs and different ions at different pressures and temperatures. For this, different concentrations of TiO2 NPs in the Formation Water (FW) were prepared to monitor the effects of NPs on the oil/water IFT, carbonate rock wettability, zeta potential, and asphaltene adsorption. The results on IFT values indicated that NPs behavior at high pressures and temperatures is completely different, as compared to the ambient conditions, and 1000 ppm NPs introduced the lowest IFT at 600 psi and 60 °C. This reduction is potentially attributed to the asphaltene adsorption at the oil/water interface by TiO2 NPs, which hinders the asphaltene deposition at the interface and in turn IFT increasing. Contact angle results revealed two distinctive behaviors for NPs at high and low concentrations. In other words, with the first interval (below the optimum concentration), an increase in NPs concentration led to a quick wettability alteration toward the water-wet condition, and with the second one (above the optimum concentration), there was an increase in contact angle with an increase in NPs concentration, which is due to the NPs stacking near the rock surface. These results were in good accordance with zeta potential measurements, in which 1000 ppm nanofluid presented the highest stability (zeta potential value of −46.9 mV). Batch adsorption experiments resulted that catalytic TiO2 NPs are capable of adsorbing asphaltene at the oil/water interface. In addition, the results on fitting experimental data to the Langmuir and Freundlich Isotherms showed that the adsorption best fitted Langmuir Isotherm and hence the adsorption type is a monolayer.

scholarly journals Dynamic interfacial properties of human apolipoproteins A-IV and B-17 at the air/water and oil/water interface

2000 ◽  
Vol 41 (9) ◽  
pp. 1419-1427 ◽  
Author(s):  
Richard B. Weinberg ◽  
Victoria R. Cook ◽  
Jeanine A. DeLozier ◽  
Gregory S. Shelness
Keyword(s):  
Interfacial Properties ◽  
Water Interface ◽  
Oil Water

scholarly journals Interfacial Properties of β-Lactoglobulin at the Oil/Water Interface: Influence of Starch Conversion Products with Varying Dextrose Equivalents

2020 ◽  
Author(s):  
Theresia Heiden-Hecht ◽  
Marco Ulbrich ◽  
Stephan Drusch ◽  
Monika Brückner-Gühmann
Keyword(s):  
Matrix Material ◽  
Milk Proteins ◽  
Interfacial Properties ◽  
Water Interface ◽  
High Concentration ◽  
Oil Water ◽  
Starch Conversion ◽  
Key Indicators ◽  
The Impact ◽  
Β Lactoglobulin

AbstractIn spray dried emulsions, frequently milk proteins are used as interfacial active components and starch conversion products are added as matrix material at high concentrations. To characterize interfacial properties at the oil/water interface by commonly applied methods, low protein, and carbohydrate concentrations from 1 to 2% are usually analyzed. The impact of a higher concentration of starch conversion products was not investigated so far. Therefore, the formation and rheological properties of β-lactoglobulin (β-LG) stabilized films at the oil/water interface were investigated via short and long-time adsorption behavior using pendant drop tensiometry as well as dilatational and interfacial shear rheology. Suitability of the applied methods to the chosen samples with higher concentrations >1–2% was verified by calculation of selected key numbers like capillary number and by detailed reviewing of the results which is summarized further on as key indicators. It is hypothesized, that the increase in concentration via presence of starch conversion products will delay interfacial stabilization as a result of increased bulk viscosity with decreasing degree of degradation (dextrose equivalent) of the starch. Furthermore, this increase in concentration leads to more stable interfacial films due to thermodynamic incompatibility effects between protein and starch conversion products which results in increases of local protein concentration. Key indicators proved a general suitability of applied methods for the evaluation of the investigated samples. Moreover, results showed an increase in interfacial film stability and elastic properties alongside a decreased interfacial tension if starch conversion products were present in a high concentration.

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