Device for mixing fluids

• US 20040114458A1
• Filed: 09/23/2003
• Published: 06/17/2004
• Est. Priority Date: 10/08/2002
• Status: Abandoned Application

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Berthier, Jean, Masse, Dominique
• Application Number:
  US10/667,303
• Publication Number:
  US 20040114458A1
• Time in Patent Office: Days
• US Class Current: 366/273
• CPC Class Codes: B01F 33/30 Micromixers
• CPC Class Codes: B01F 33/451 wherein the mixture is directly exposed to an electromagnetic field without use of a stirrer, e.g. for material comprising ferromagnetic particles or for molten metal
• CPC Class Codes: B01J 2219/00889 Mixing micromixers B01F33/30
• CPC Class Codes: B01L 3/5027 by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip B01L3/5023 takes precedence; micromixers B01F33/30; microreactors for synthesis B01J19/0093; microcapillary devices in general B81B1/00

Abstract

The invention concerns a device for mixing fluids.

Said device comprises a chamber (C) in which are present the fluids to be mixed (L1, L2) and means (ai, Ei) for displacing, around a central point, under the action of a force, the particles present in said chamber (C), the trajectory of said particles having radial fluctuations in relation to the central point.

The invention applies to mixtures of fluids and colloids in the fields of chemistry or biology.

Claims

1. Device for mixing fluids comprising a chamber (C) in which are present the fluids to be mixed (L1, L2), characterised in that it comprises means (ai, Ei) for displacing, around a central point, under the action of a force, the particles present in said chamber (C), the trajectory of said particles having radial fluctuations in relation to the central point.

2. Device according to claim 1, characterised in that the particles are paramagnetic beads (b) and in that the means for displacing said particles comprise means for establishing a magnetic field rotating around the central point.

3. Device according to claim 2, characterised in that the means for establishing a magnetic field rotating around the central point comprise permanent magnets (A1, A2) rotating around the central point and a ferromagnetic core (Nm) placed at the level of the central point.

4. Device according to claim 2, characterised in that the means for establishing a magnetic field rotating around the central point comprise electromagnets (ai) and a ferromagnetic core (Nm) placed at the level of the central point.

5. Device according to claim 1, characterised in that the particles are molecules (p) of at least one of the fluids to be mixed and in that the means for displacing the particles comprise means for establishing a dielectrophoretic field rotating around the central point.

6. Device according to claim 5, characterised in that the means for establishing a dielectrophoretic field rotating around the central point comprise a dielectric core (Nd) placed at the level of the central point, the dielectric constant (ε

_c) of the dielectric core having a value greater that the dielectric constant of the fluids to be mixed, and electrode pairs (Ei) on the periphery of the chamber, the two electrodes of a pair being situated opposite each other, on either side of the chamber (C), said electrode pairs being supplied alternately, in rotating around the dielectric core, by an alternating current.

7. Device according to claim 6, characterised in that the electrodes (E1) are electrically isolated from the fluids to be mixed in order to avoid a local ionisation of said fluids.

8. Device according to claim 6 or 7, characterised in that the frequency of the alternating current supplying the electrodes (Ei) is between 1 kHz and 100 kHz.