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Kyung-hee Lim - One of the best experts on this subject based on the ideXlab platform.
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Changes in Two-Phase Emulsion morphology in temperature-amphiphile concentration or fish diagram for ternary amphiphile/oil/water systems.
Journal of colloid and interface science, 2005Co-Authors: Jong-moon Lee, Kyung-hee LimAbstract:Abstract We examined the morphologies of Two-Phase Emulsions in the ternary 2-butoxyethanol/n-decane/water system at various temperatures and water-to-oil ratios (WORs). The Two-Phase Emulsion morphologies depended on temperature, WOR, and amphiphile concentration, and the results are presented in a temperature–amphiphile concentration coordinate system or a “fish” diagram. The observations made in this work contradict the predictions by the Phase-inversion-temperature (PIT) concept. At WOR T T lc (lower critical endpoint temperature), dividing the Two-Phase region into the subregions of B/T (W/O) and T/B (O/W) Emulsions. At T > T uc (upper critical endpoint temperature) and at low amphiphile concentrations, only B/T Emulsions appeared, irrespective of temperature. At WOR > 1, the situation was reversed; T/B Emulsions at T T lc , T/B and B/T Emulsions at T > T uc , and T/B Emulsions at low amphiphile concentrations, irrespective of temperature. At WOR = 1, Two horizontal inversion lines, one each at T T lc and T > T uc , were observed. The morphologies of the Two-Phase Emulsions were B/T or T/B Emulsions at low amphiphile concentrations, and at higher amphiphile concentrations T/B at T T lc and B/T at T > T uc . All these findings along with three-Phase Emulsion data result in complete Emulsion morphology diagrams in the temperature–amphiphile concentration space or fish diagram.
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changes in Two Phase Emulsion morphology in temperature amphiphile concentration or fish diagram for ternary amphiphile oil water systems
Journal of Colloid and Interface Science, 2005Co-Authors: Jong-moon Lee, Kyung-hee LimAbstract:Abstract We examined the morphologies of Two-Phase Emulsions in the ternary 2-butoxyethanol/n-decane/water system at various temperatures and water-to-oil ratios (WORs). The Two-Phase Emulsion morphologies depended on temperature, WOR, and amphiphile concentration, and the results are presented in a temperature–amphiphile concentration coordinate system or a “fish” diagram. The observations made in this work contradict the predictions by the Phase-inversion-temperature (PIT) concept. At WOR T T lc (lower critical endpoint temperature), dividing the Two-Phase region into the subregions of B/T (W/O) and T/B (O/W) Emulsions. At T > T uc (upper critical endpoint temperature) and at low amphiphile concentrations, only B/T Emulsions appeared, irrespective of temperature. At WOR > 1, the situation was reversed; T/B Emulsions at T T lc , T/B and B/T Emulsions at T > T uc , and T/B Emulsions at low amphiphile concentrations, irrespective of temperature. At WOR = 1, Two horizontal inversion lines, one each at T T lc and T > T uc , were observed. The morphologies of the Two-Phase Emulsions were B/T or T/B Emulsions at low amphiphile concentrations, and at higher amphiphile concentrations T/B at T T lc and B/T at T > T uc . All these findings along with three-Phase Emulsion data result in complete Emulsion morphology diagrams in the temperature–amphiphile concentration space or fish diagram.
Jong-moon Lee - One of the best experts on this subject based on the ideXlab platform.
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Changes in Two-Phase Emulsion morphology in temperature-amphiphile concentration or fish diagram for ternary amphiphile/oil/water systems.
Journal of colloid and interface science, 2005Co-Authors: Jong-moon Lee, Kyung-hee LimAbstract:Abstract We examined the morphologies of Two-Phase Emulsions in the ternary 2-butoxyethanol/n-decane/water system at various temperatures and water-to-oil ratios (WORs). The Two-Phase Emulsion morphologies depended on temperature, WOR, and amphiphile concentration, and the results are presented in a temperature–amphiphile concentration coordinate system or a “fish” diagram. The observations made in this work contradict the predictions by the Phase-inversion-temperature (PIT) concept. At WOR T T lc (lower critical endpoint temperature), dividing the Two-Phase region into the subregions of B/T (W/O) and T/B (O/W) Emulsions. At T > T uc (upper critical endpoint temperature) and at low amphiphile concentrations, only B/T Emulsions appeared, irrespective of temperature. At WOR > 1, the situation was reversed; T/B Emulsions at T T lc , T/B and B/T Emulsions at T > T uc , and T/B Emulsions at low amphiphile concentrations, irrespective of temperature. At WOR = 1, Two horizontal inversion lines, one each at T T lc and T > T uc , were observed. The morphologies of the Two-Phase Emulsions were B/T or T/B Emulsions at low amphiphile concentrations, and at higher amphiphile concentrations T/B at T T lc and B/T at T > T uc . All these findings along with three-Phase Emulsion data result in complete Emulsion morphology diagrams in the temperature–amphiphile concentration space or fish diagram.
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changes in Two Phase Emulsion morphology in temperature amphiphile concentration or fish diagram for ternary amphiphile oil water systems
Journal of Colloid and Interface Science, 2005Co-Authors: Jong-moon Lee, Kyung-hee LimAbstract:Abstract We examined the morphologies of Two-Phase Emulsions in the ternary 2-butoxyethanol/n-decane/water system at various temperatures and water-to-oil ratios (WORs). The Two-Phase Emulsion morphologies depended on temperature, WOR, and amphiphile concentration, and the results are presented in a temperature–amphiphile concentration coordinate system or a “fish” diagram. The observations made in this work contradict the predictions by the Phase-inversion-temperature (PIT) concept. At WOR T T lc (lower critical endpoint temperature), dividing the Two-Phase region into the subregions of B/T (W/O) and T/B (O/W) Emulsions. At T > T uc (upper critical endpoint temperature) and at low amphiphile concentrations, only B/T Emulsions appeared, irrespective of temperature. At WOR > 1, the situation was reversed; T/B Emulsions at T T lc , T/B and B/T Emulsions at T > T uc , and T/B Emulsions at low amphiphile concentrations, irrespective of temperature. At WOR = 1, Two horizontal inversion lines, one each at T T lc and T > T uc , were observed. The morphologies of the Two-Phase Emulsions were B/T or T/B Emulsions at low amphiphile concentrations, and at higher amphiphile concentrations T/B at T T lc and B/T at T > T uc . All these findings along with three-Phase Emulsion data result in complete Emulsion morphology diagrams in the temperature–amphiphile concentration space or fish diagram.
Didier Dupont - One of the best experts on this subject based on the ideXlab platform.
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Development of an aqueous Two-Phase Emulsion using hydrophobized whey proteins and erythritol
Food Hydrocolloids, 2019Co-Authors: Ashkan Madadlou, Arnaud Saint-jalmes, Fanny Guyomarc’h, Juliane Floury, Didier DupontAbstract:Formation of aqueous Two-Phase (ATP) Emulsions relies on the immiscibility of Two (bio)polymeric Phases. Herein, we report that hydrophobization of whey proteins via a pre-acetylation and succeeding acetylation/heating combined process makes solutions of whey protein isolate (WPI) immiscible with alginate solutions. Erythritol was also added at different concentrations (0, 52, 105, and 158 mg/g) into the hydrophobized WPI solution. Subsequently, Emulsions at an alginate to WPI weight ratio of 0.1–0.9 were prepared. Erythritol supplementation facilitated emulsification and increased Emulsion stability, so that at the erythritol concentration of 105 mg/g, the Emulsion was stable for a minimum duration of 7 days. The droplet size evolved and reached to ≈5 μm during this period. The hydrophobized protein had a mean hydrodynamic diameter of 80 nm, ζ-potential of −39 mV, and intrinsic fluorescence emission peak of 335 nm. Erythritol addition did not influence any of the above-mentioned characteristics. However, the hydrophobized WPI solution changed from Newtonian to a more viscous and shear-thinning fluid by adding erythritol at concentrations ≥105 mg/g, due probably to the induction of interaction among protein particles. A diameter of 150 nm was calculated for the air-dried hydrophobized protein particles using atomic force microscopy images, supporting the assumption that exclusion of erythritol from the protein particles surface induced inter-particle interactions. Erythritol addition at 105 mg/g had a Twofold larger influence on the surface tension of hydrophobized WPI compared to water. It decreased the surface tension of hydrophobized WPI to 45 mN/m after droplet ageing for 350 s.
Sven Wieβner - One of the best experts on this subject based on the ideXlab platform.
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Preparation and properties of a composite made by barium sulfate-containing polytetrafluoroethylene granular powder:
High Performance Polymers, 2016Co-Authors: Luke Yan, Rongrong Huang, Jian Xiao, Huiyun Xia, Min Chao, Sven WieβnerAbstract:Barium sulfate (BaSO4)-containing polytetrafluoroethylene (PTFE) granular powder was prepared through a Two-Phase Emulsion dispersion granulation method. Because of its large bulk density, small av...
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Study on Preparation of BaSO4-Containing Polytetrafluoroethylene Granular Powder
Advances in Polymer Technology, 2015Co-Authors: Luke Yan, Jian Xiao, Min Chao, Lining Gao, Sven WieβnerAbstract:The aim of this study was to prepare BaSO4-containing polytetrafluoroethylene granular powder by a Two-Phase Emulsion dispersion method. The granulating process was conducted with stirring in an aqueous medium containing a specific surfactant without a uniform granulator or apparatus. And also we studied the role of surfactant, granulating time in the particle size, and particle size distribution. The properties of granular powder were studied through various methods such as flowability test, bulk density test, average particle size, and particle size distribution test. The shape of particles in the granular powder was studied by a hot stage polarizing optical microscope. The obtained granular powder showed large bulk density, small average particle size, narrow particle size distribution, and superior powder flowability.
Liwei Chen - One of the best experts on this subject based on the ideXlab platform.
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Influences of combustion improver content and motionless time on the stability of Two-Phase Emulsions
Particulate Science and Technology, 2016Co-Authors: Cherngyuan Lin, Chang-ting Tsai, Liwei ChenAbstract:ABSTRACTThe heavy molecular bonds of liquid fuels can be broken with the assistance of a nitromethane fuel additive by virtue of its explosive and flammable properties to obtain greater heat release. Because of the immiscibility between nitromethane and petro-diesel, Two-Phase Emulsions of nitromethane dispersed in the oil Phase of a mixture of diesel and biodiesel were prepared. The experimental results show that microwave irradiation produced an Emulsion with a larger number of dispersed nitromethane droplets in the continuous oil mixture, a smaller mean droplet size, and lower turbidity than magnetic stirring, and thus was a better method for preparation of the Two-Phase Emulsion. The increase in the nitromethane weight fraction increased the number of dispersed nitromethane droplets and the Emulsion turbidity. In addition, allowing the Emulsion preparation to remain motionless for a longer period of time after either method resulted in an obvious reduction in the emulsification stability (ES).
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emulsification characteristics of three and Two Phase Emulsions prepared by the ultrasonic emulsification method
Fuel Processing Technology, 2006Co-Authors: Cherngyuan Lin, Liwei ChenAbstract:Diesel engines exhausting gaseous emission and particulate matter have long been regarded as one of the major air pollution sources, particularly in metropolitan areas, and have been a source of serious public concern for a long time. The emulsification method is one of the potentially effective techniques to reduce emission pollution from diesel engines. Ultrasonic waves are a kind of sound waves with a frequency larger than 20 kHz, and they cannot be detected by the human ear. The phenomena of cavitation and hot spots produced by the rather violent action of ultrasonic waves can cause rapid chemical and physical reactions. This allows immiscible liquids to be well stirred with each other by means of ultrasonics. An ultrasonically vibrating machine that provides ultrasonic waves of a 40-kHz frequency was employed to prepare Two- and three- Phase Emulsions in this experimental study. The fuel properties and the Emulsion stability of the diesel Emulsions were measured and analyzed. Experimental results show that the ultrasonic emulsification method successfully prepared Two- and three-Phase Emulsions with tiny dispersed-Phase droplets that are very evenly distributed in the outer oil or water Phase. The ultrasonic processing time, quantity and HLB of the emulsifying agent were noted to have determinative influences on the formation of the Emulsion and the fuel properties. A longer ultrasonic processing time caused less un-emulsified diesel fuel, smaller sizes and a more even distribution of dispersed-Phase droplets in the outer oil Phase and larger Emulsion viscosity. However, a longer ultrasonic processing time also produced a larger temperature rise in the Emulsion, leading to the deterioration of the Emulsion stability. The O/W Emulsion was found to have the lowest percentage of separation and thus the highest Emulsion stability among the O/W/O, O/W and W/O Emulsions. In addition, in comparison with the W/O Emulsion, the O/W Emulsion was shown to have a smaller size and a more even distribution of the dispersed-Phase droplets. It also had a lesser rise in Emulsion temperature when the ultrasonic processing time increased. The control of the ultrasonic processing time is important to successfully prepare the three-Phase O/W/O Emulsion. Too long a vibration time at the second-stage of emulsification is shown to cause the dispersed-Phase pellets to contract and congregate with the inner-Phase droplets. The three-Phase Emulsion structure then finally disappears and transforms into a Two-Phase Emulsion. The addition of 2% by volume of the emulsifier mixture of Span80 and Tween80 with a HLB = 8, as suggested by this study for the preparation of stable Two- and three-Phase Emulsions, were observed to have the lowest percentage of separation of the W/O and O/W/O Emulsions. For preparing a stable O/W Emulsion, the proportion of the emulsifier could be as low as 1.5% by volume. The percentage of separation of the O/W/O Emulsion was lower and less influenced by the change in Emulsion temperature than was the W/O Emulsion with the same water content. However, the O/W/O Emulsion was found to have a larger viscosity and a more significant variation of its viscosity, depending on the ultrasonic processing time, than the W/O Emulsion.
