Abstract:
The present invention generally relates to microfluidic droplets and, in particular, to multiple emulsion microfluidic droplets. In one set of embodiments, multiple emulsion droplets are provided, where an inner shell of the droplet is relatively thin, compared to the outer shell (or other shells) of the droplet. For instance, in one set of embodiments, the inner droplet has an average thickness of less than about 1000 nm. In some cases, the inner shell may be rigidified, e.g., to form a gel or a polymeric layer. This may be useful, for example, for preventing coalescence of fluids within the microfluidic droplet. Other embodiments of the present invention are generally directed to methods of making such droplets, methods of using such droplets, microfluidic devices for making such droplets, and the like.
Abstract:
Multiple emulsions and techniques for the formation of multiple emulsions are generally described. A multiple emulsion, as used herein, describes larger droplets that contain one or more smaller droplets therein. In some embodiments, the larger droplet or droplets may be suspended in a carrying fluid containing the larger droplets that, in turn, contain the smaller droplets. As described below, multiple emulsions can be formed in one step in certain embodiments, with generally precise repeatability, and can be tailored in some embodiments to include a relatively thin layer of fluid separating two other fluids.
Abstract:
A process for making a resin emulsion suitable for use in forming toner particles is provided. In embodiments, a suitable process includes melt mixing a resin in the absence of an organic solvent, optionally adding a surfactant to the resin, adding to the resin a basic agent and water, and subjecting the resin, basic agent and water to acoustic mixing at a suitable frequency to form an emulsion of resin particles. In embodiments, the resin emulsion thus produced may be utilized to form a toner.
Abstract:
The invention relates to medicine. The method for producing a cosmetic remedy comprises stagewise dispersion of the components at room temperature, wherein the components are introduced into an apparatus having a powerful hydroacoustic action, in which the components are dispersed and the emulsion is subjected to cavitation homogenization and then packaged. An acoustic cavitation mode is formed by a dual resonance effect within a continuous-flow mechanical oscillation system/channel of rectangular cross section in the final length, on the opposite sides of which channel sonic oscillations are generated in the parallel mode, with a standing wave being formed at the fundamental harmonic frequency for the specific channel wall, said sonic oscillations in turn forming a quasi-flat standing wave in a moving multi-phase medium, consisting of the ingredients being mixed, in the gap between the channel walls. The width of the channel gap h is selected by a multiple of one fourth of the wavelength being excited in the specific multi-phase medium by the channel walls. The oscillation amplitude of the channel wall is selected to be optimum for the various stages of preparing the emulsion and exceeds the acoustic cavitation threshold for the specific moving multi-phase medium being processed.
Abstract:
An agitator (1) is for a liquid analysis system (3, 50). It has a chamber (5) for reception of a sample liquid. A passageway (6) from the bottom of the chamber (5) ends in an agitator chamber (7). A side wall of the agitator chamber (7) is formed by a diaphragm (8). The diaphragm (8) is connected to an electric motor (9) with an eccentric drive for reciprocating movement of the diaphragm (8). A gas inlet (10) in the opposite side of the body (2) is connected by a passageway (11) to the agitator chamber (7). The agitation chamber has a domed internal face opposed to the diaphragm, by which about 10% of the agitation chamber (7) volume is displaced by the inward movement of the diaphragm (8). Also, advantageously, there is a uniform application of displacement force within the agitation chamber (7) by virtue of the domed internal surface.
Abstract:
Provided herein are methods for the assembly of a polynucleic acid sequence that is at least partially carried out on a microfluidic device; methods for the preparation of a library of polynucleic acid sequences; microfluidic devices; methods for designing nucleic acid sequences; methods for planning the assembly of a polynucleic acid sequence from a plurality of nucleic acid sequences; systems comprising components for carrying out these methods; computer programs which, when run on a computer, implements these methods; and computer readable medium or carrier signals encoding such a computer program.
Abstract:
Die vorliegende Erfindung betrifft ein Testelement sowie eine Vorrichtung und ein Verfahren zum Erzeugen einer durchmischten Flüssigkeit mittels eines mikrofluidischen, rotierenden Testelements (2) mit einem Substrat und einer mikrofluidischen Kanalstruktur (10) zur Aufnahme der Flüssigkeit. Das Verfahren umfasst das Rotieren des Testelements (2) mit der Flüssigkeit gemäß eines Rotationsprofils, das wenigstens zwei Zyklen umfasst, wobei in einem Zyklus die folgenden Schritte ausgeführt werden: Beschleunigen der Rotation des Testelements (2) mit einer Beschleunigung a1 bis zum Erreichen einer ersten End-Winkelgeschwindigkeit ω1 und anschließend das Beschleunigen der Rotation des Testelements (2) mit einer Beschleunigung a2 bis zum Erreichen einer zweiten End-Winkelgeschwindigkeit ω2. Die Beschleunigung a1 und die Beschleunigung a2 sind entgegengerichtet. Wenigstens eine der Beschleunigungen a1,a2 und/oder wenigstens eine der End-Winkelgeschwindigkeiten ω1,ω2 ändert sich von einem Zyklus zum nächsten Zyklus, wodurch ein gleichmäßiger Transport von in der Flüssigkeit enthaltenen Molekülen an eine aktive Oberfläche in der Kanalstruktur (10) erzielt wird.
Abstract:
A mixer apparatus for use with a vessel centered about a longitudinal axis is disclosed. The mixer has a blade which: defines a central head axis; has a first end and a second end. The second end defines an inside blade diameter 'ID' and the first end defines an outer blade diameter 'OD'. The blade is positioned within and coaxial to the vessel. A scotch yoke, operatively connected to the blade by a shaft, effects reciprocating longitudinal movement of the blade through a stroke 'S', with a duration 'T' for each cycle, wherein 175 0.36 x OD2/ID2 x S/T 250 when OD, ID and S are expressed in inches, and T is expressed in minutes.
Abstract:
This invention relates to preparation of micro emulsions having a controlled size. It provides methods, measures, apparatus and products produced by the methods. The method is particularly suitable for preparing micro emulsions of water containing one or more ionic species in an oil and/or dense fluid phase such as CO2 containing fluids under near or supercritical conditions, thereby enabling the use of said dense fluids as solvents for extraction of ionic species, as nano-reactor templates and/or as a carrier for further processing such as deposition on a solid material and/or in a process for producing fine particles, such as particles in the nano- or micrometer range.