摘要:
Methods for preparing all-aqueous emulsions, including stable emulsions or emulsions having high viscosity and/or ultra-low interfacial tension are described. The method includes mixing, combining, or contacting a first electrically charged phase containing a first solute (e.g., dispersed phase) with at least a second phase containing a second solute (e.g., continuous phase). The solutes are incompatible with each other. The electrostatic forces between the two phases induce the formation of droplets of a dispersed phase in a continuous phase. The dispersed and continuous phases contain oppositely charged molecules, such as surfactants or other macromolecules and colloids which stabilize the drops of the dispersed phase. Complex coacervation of the oppositely charged molecules or colloids at the interface of the two aqueous phases results in formation of a membrane or barrier which prevents coalescence or aggregation of the droplets. The membrane also prevents leakage of any encapsulated agents from the droplets.
摘要:
The invention relates to a process for preparing an emulsion of a first liquid in a second liquid wherein (a) at least one of the liquids comprises a surfactant or a precursor thereof, and (b) said second liquid has an electrical conductivity of less than 100 microSiemens/ centimeter, and (c) interfacial tension between said liquids is at least 0.0001 mN/m, and (d) said liquids are subjected to an electric field of strength between 5000 to 107 V/m.
摘要:
The disclosed invention relates to a process for treating or making an emulsion in a microchannel. Microchannel repeating unit (200) comprises process microchannel (210) apertured section (240) and liquid channel (270). Process microchannel (210) has opposite sidewalls (212) and (214). Apertured section (240) is in sidewall (212). The apertured section (240) may be referred to as a porous section or porous substrate. The apertured section (240) may comprise a sheet or plate (242) having a plurality of apertures (244) extending through it. The liquid channel (270) opens to process microchannel (210) through apertured section (240). The liquid channel (270) is a flow-through channel with an outlet indicated at arrow (275). The process microchannel (210) has mixing zone (216), and may have non-apertured regions (not shown in the drawings) upstream and/or downstream from mixing zone (216). The mixing zone (216) is adjacent to the apertured section (240). In one embodiment, the mixing zone (216) may have a restricted cross section to enhance mixing. In operation, the first liquid flows into process microchannel (210), as indicated by directional arrow (218), and into the mixing zone (216). A second liquid flows into liquid channel (270), as indicated by arrow (272), and then flows through apertured section (240), as indicated by arrows (274), into the mixing zone (216). In mixing zone (216), the second liquid contacts and mixes with the first liquid to form an émulsion. Heating or cooling may be optional.
摘要:
Disclosed are apparatuses, systems, and methods for programmable fluidic processors. In one embodiment, the invention involves manipulating droplets across a reaction surface of the processor substantially contact-free of any surfaces. The reaction surface and the electrodes of the processor may include a coating repelling the droplets. Further, the present invention provides for a suitable suspending medium for repelling droplets away from fixed surfaces.
摘要:
Les électrodes (11) utilisées pour créer un champ électrique sont revêtues d'au moins deux couches de matériaux isolants différents, la première couche (22b) en contact avec l'électrode étant constituée d'un matériau liquide isolant, par exemple de benzylnéocaprate ou d'huile de transformateur, et la couche externe (22a) étant constituée d'un matériau solide isolant, par exemple de polytétrafluoroéthylène. Ces électrodes ont de préférence la forme de barreaux disposés parallèlement au sens de l'écoulement des fluides et elles sont munies de déflecteurs (24) pour empêcher qu'il ne s'établisse un écoulement de la phase dispersée sous la forme de film le long des barreaux.
摘要:
The present invention relates to a hydrodynamic supercavitation apparatus in which effects of biodiesel production, emulsification, water treatment, descaling, and particle crushing or the like are doubled according to a significant increase in an acting force of an output side of the apparatus where a water vapor bubble-type cavitation collapses. The hydrodynamic supercavitation apparatus according to the present invention includes: a body having one side connected to a fluid supply line for supplying fluid and a section decreasing space portion whose cross sectional area is gradually decreased formed at the inside thereof, the section decreasing space portion having a large space portion formed on one side thereof in such a manner as to communicate with the fluid supply line and a small space portion formed on the other side thereof; an outlet cap coupled to one end of the body and having a first section increasing space portion formed on one side of the interior thereof in such a manner as to communicate with the small space portion of the body and a second section increasing space portion formed on the other side of the interior thereof in such a manner as to be gradually increased from a smaller cross sectional area than the first section increasing space portion toward a larger cross sectional area than the first section increasing space portion; a closing cap coupled to the other end of the body so as to close the other end of the body; and a center bar supportedly coupled to the closing cap on one end thereof and passed through the interior of the body in such a manner as to be extended to the second section increasing space portion of the outlet cap.
摘要:
The invention relates to a method for producing fine particle suspensions by melt emulsification, comprising at least one material having a melting temperature above room temperature, comprising the following steps: (a) transferring at least one pre-emulsion comprising a continuous and a disperse phase in a rotor-stator machine, a rotor-rotor machine, or to a continuous and/or disperse phase; (b) optionally adding one or more further components to the at least one pre-emulsion in the rotor-stator machine; (c) emulsifying the at least one pre-emulsion by means of mechanical shearing and/or stretching and/or turbulence at a temperature no greater than 10 K above the melting temperature of the at least one material having a melting temperature above room temperature, or at a temperature no less than 10 K below and no greater than 10 K above the glass transition temperature or the melting temperature, as long as the material having a melting temperature above room temperature is a polymer, for producing a fine particle emulsion; and (d) cooling the fine particle emulsion for producing a fine particle suspension; wherein the disperse phase portion is in the range of 85% to 99.5% at least in step (c).
摘要:
Plant for the production of an emulsion of water in hydrocarbons, comprising: pump means (13;22) for the drawing and mixing in a first tank (16) of dosed amounts of an hydrocarbon, or of a mixture of hydrocarbons contained in a second tank (12), with an emulsifier contained in a third tank (18); pump means (22) for drawing and introducing dosed amounts of water, drawn from a fourth tank (6) in said mixture of hydrocarbons and emulsifier contained in said first tank (16); pump means (22) for pressure circulating many times said mixture of water, hydrocarbons and emulsifier from said first tank (16) through an emulsifier device (E) and from this again in said first tank (16) until obtaining a stable emulsion of water in hydrocarbons, and for transferring said emulsion from said first tank (16) until obtaining a stable emulsion of water in hydrocarbons, and for transferring said emulsion from said first tank (16) in a stocking tank (37) from which said emulsion may be drawn for the delivery to the users.