DE10318864B3 - Micro-fluidic valve, for controlled introduction of fluid into channel during capillary electrophoresis, combines electrical potential gradient with curvature inducing Coanda effect - Google Patents
Micro-fluidic valve, for controlled introduction of fluid into channel during capillary electrophoresis, combines electrical potential gradient with curvature inducing Coanda effect Download PDFInfo
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- DE10318864B3 DE10318864B3 DE10318864A DE10318864A DE10318864B3 DE 10318864 B3 DE10318864 B3 DE 10318864B3 DE 10318864 A DE10318864 A DE 10318864A DE 10318864 A DE10318864 A DE 10318864A DE 10318864 B3 DE10318864 B3 DE 10318864B3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures 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
- B01L3/502738—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures 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 characterised by integrated valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/30—Micromixers
- B01F33/3031—Micromixers using electro-hydrodynamic [EHD] or electro-kinetic [EKI] phenomena to mix or move the fluids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/447—Systems using electrophoresis
- G01N27/44704—Details; Accessories
- G01N27/44743—Introducing samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/447—Systems using electrophoresis
- G01N27/44756—Apparatus specially adapted therefor
- G01N27/44791—Microapparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/06—Fluid handling related problems
- B01L2200/0605—Metering of fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
- B01L2400/0415—Moving fluids with specific forces or mechanical means specific forces electrical forces, e.g. electrokinetic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0475—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure
- B01L2400/0487—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure fluid pressure, pneumatics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/06—Valves, specific forms thereof
- B01L2400/0622—Valves, specific forms thereof distribution valves, valves having multiple inlets and/or outlets, e.g. metering valves, multi-way valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures 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
- B01L3/50273—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures 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 characterised by the means or forces applied to move the fluids
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Electrochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Fluid Mechanics (AREA)
- Hematology (AREA)
- Clinical Laboratory Science (AREA)
- Micromachines (AREA)
Abstract
Description
Zur Behandlung von Fluiden, insbesondere für deren Analyse, beispielsweise durch Kapillarelektrophorese, kann es notwendig sein, zwei Fluidströme derart miteinander zu koppeln, dass für eine bestimmte Zeit oder in einer vorgegebenen Menge eine Probe des einen Fluidstroms an einer Kreuzungs- oder Kontaktstelle in den anderen Fluidstrom eingefügt wird.For the treatment of fluids, in particular for their Analysis, for example by capillary electrophoresis, may be necessary be two fluid flows to couple in such a way that for a certain time or a sample of the one fluid stream in a predetermined amount a crossing or contact point is inserted into the other fluid stream.
So ist aus der
Aus der WO 00/70080 A1 und der WO 03/006133 A2 ist jeweils eine mikrofluidische Einrichtung bekannt, bei der mittels ei nes Fluids durch einen Kanal transportierte Zellen durch Fluoreszenz-Detektion nach unterschiedlichen Eigenschaften klassifiziert werden. In Abhängigkeit von dem Detektionsergebnis werden anschließend die Zellen druckgesteuert mit Hilfe von einer oder mehreren seitlich in den Kanal eingeleiteten Steuerströmungen entweder in den einen oder den anderen von zwei Kanalabzweigen umgeleitet.From WO 00/70080 A1 and WO 03/006133 A microfluidic device is known in each case in which cells transported through a channel by means of a fluid Fluorescence detection classified according to different properties become. Dependent on The cells are then pressure-controlled from the detection result with the help of one or more laterally introduced into the channel control flow redirected to one or the other of two channel branches.
Aus der
Die WO 02/083988 A2 offenbart einen Mikroreaktor mit einer elektrochemischen Zelle, durch die hindurch zwischen zwei an einer Spannungsquelle angeschlossenen Elektroden eine oder mehrere ionisch leitende Fluide fließen, wobei es in der Zelle zu einer elektrochemischen Reaktion kommt. Zur besseren Trennung der hineinfließenden Edukte bzw. herausfließenden Reaktionsprodukte können die Edukte über zwei Kanäle in die elektrochemische Zelle eingeleitet werden, von denen der eine Kanal näher zu der einen Elektrode und der andere Kanal näher zu der anderen Elektrode in die elektrochemische Zelle einmündet; entsprechend können die Reaktionsprodukte aus dem zu der einen oder anderen Elektrode jeweils näheren Bereich über unterschiedliche Kanäle aus der Zelle herausgeführt werden.WO 02/083988 A2 discloses one Microreactor with an electrochemical cell through which between two electrodes connected to a voltage source One or more ionically conductive fluids flow in the cell there is an electrochemical reaction. For better separation the flowing one Educts or flowing out Reaction products can the educts about two channels are introduced into the electrochemical cell, of which the one channel closer to one electrode and the other channel closer to the other electrode opens into the electrochemical cell; accordingly, the Reaction products from one to the other electrode closer Area about different channels led out of the cell become.
Gegenstand der vorliegenden Erfindung ist eine mikrofluidische Einrichtung zur gesteuerten Einleitung eines ersten Fluids aus einem ersten Kanal in einen ein zweites Fluid enthaltenden zweiten Kanal und zur elektrokinetischen Förderung beider Fluide durch den zweiten Kanal,
- – wobei die beiden Kanäle an einer für die Einleitung des ersten Fluids in den zweiten Kanal vorgesehenen Verbindungsstelle miteinander fluidisch verbunden sind,
- – wobei eine das erste Fluid mittels Druck durch den ersten Kanal in Richtung auf die Verbindungsstelle fördernde Vorrichtung vorhanden ist,
- – wobei der erste Kanal an einer der Verbindungsstelle gegenüberliegenden Innenseite eine konvexe Krümmung aufweist, an der sich das erste Fluid aufgrund des Coanda-Effekts bei einer ein Mindestmaß übersteigenden Strömung anlegt und daran entlangfließt,
- – wobei in Bezug auf die Strömungsrichtung des zweiten Fluids zwischen einer vor der Verbindungsstelle liegenden Stelle des zweiten Kanals und einer hinter der Verbindungsstelle liegenden Stelle des zweiten Kanals eine elektrische Spannung anliegt und
- – wobei in Bezug auf die Strömungsrichtung des ersten Fluids zwischen einer vor der Verbindungsstelle liegenden Stelle des ersten Kanals und der oder einer weiteren hinter der Verbindungsstelle liegenden Stelle des zweiten Kanals dieselbe oder eine weitere elektrische Spannung zur Einleitung des ersten Fluids in den zweiten Kanal anlegbar ist.
- The two channels are fluidly connected to one another at a connection point provided for introducing the first fluid into the second channel,
- A device which conveys the first fluid by means of pressure through the first channel in the direction of the connection point,
- The first channel has a convex curvature on an inner side opposite the connection point, on which the first fluid, due to the Coanda effect, attaches to and flows along a flow that exceeds a minimum,
- - With respect to the direction of flow of the second fluid, an electrical voltage is present between a point of the second channel lying in front of the connection point and a point behind the connection point of the second channel and
- - With respect to the direction of flow of the first fluid between a point in front of the connection point of the first channel and one or more points behind the point of connection of the second channel, the same or a further electrical voltage for introducing the first fluid into the second channel can be applied ,
Im Unterschied zu der bekannten Einrichtung wird bei der erfindungsgemäßen Einrichtung im ersten Betriebszustand das erste Fluid nicht elektrokinetisch, sondern druckgetrieben durch den ersten Kanal gefördert, wobei im Bereich der Verbindungsstelle beider Kanäle das Eindringen des ersten Fluids in den zweiten Kanal durch Ausnutzen des so genannten Coanda-Effekts verhindert wird. Der Coanda-Effekt beschreibt die Eigenschaft von Fluiden, die angenähert tangential zu einer Wand ausgeschleust werden und deren Strömung ein Mindestmaß übersteigt, sich an dieser Wand anzulegen und an ihr entlangzuströmen. Die Nutzung des Coanda-Effekts zur Steuerung von Fluiden, auch in mikrofluidischen Einrichtungen ist an sich bekannt.In contrast to the known device, in the device according to the invention in the first operating state the first fluid is conveyed through the first channel, not electrokinetically, but rather in a pressure-driven manner, the penetration of the first fluid into the second channel in the region of the connection point of the two channels by utilizing the so-called Coanda Effect is prevented. The Coanda effect describes the property of fluids, which are discharged approximately tangentially to a wall and whose flow exceeds a minimum, to contact this wall and to flow along it. The use of the Coanda effect for Control of fluids, even in microfluidic devices, is known per se.
Da der Coanda-Effekt eine Mindestströmung des Fluids voraussetzt, ist in vorteilhafter Weise vorgesehen, dass sich der erste Kanal vor der Verbindungsstelle und mit Beginn der Krümmung verengt und im Bereich der Krümmung verengt bleibt, so dass dort die Strömungsgeschwindigkeit des ersten Fluids erhöht wird.Since the Coanda effect is a minimum flow of the Assuming fluids, it is advantageously provided that the first channel before the junction and at the beginning of the curvature narrowed and in the area of curvature remains narrowed so that the flow velocity of the first fluid there elevated becomes.
Zum Einleiten des ersten Fluids in den zweiten Kanal wird in einem zweiten Betriebszustand die weitere Spannung zwischen dem ersten und dem zweiten Kanal angelegt. Als Folge davon wird das erste Fluid elektrokinetisch in den zweiten Kanal umgelenkt, wobei der Coanda-Effekt aufgehoben wird bzw. nicht zustande kommt. Die Umleitung des ersten Fluids in den zweiten Kanal kann in Abhängigkeit von der Höhe der weiteren Spannung vollständig oder teilweise erfolgen.To introduce the first fluid into the second channel becomes the second in a second operating state Voltage applied between the first and second channels. As As a result, the first fluid becomes electrokinetic in the second Channel deflected, whereby the Coanda effect is canceled or not comes about. The diversion of the first fluid into the second channel can depend on the height of further tension completely or partially done.
Die zwischen dem ersten und dem zweiten Kanal angelegte weitere Spannung kann zu der an dem ersten Kanal liegenden Spannung identisch sein. Die erfindungsgemäße mikrofluidische Einrichtung kommt dann mit nur einer einzigen Spannungsquelle aus, um das erste Fluid in den zweiten Kanal einzuleiten und im Weiteren zusammen mit dem zweiten Fluid elektrokinetisch durch den zweiten Kanal zu fördern. Da nur eine einzige Spannung an den Kanälen angelegt wird, kann die Spannung weitgehend frei gewählt und beispielsweise für eine elektrophoretische Trennung des ersten Fluids in dem zweiten Kanal optimal eingestellt werden.The one between the first and the second channel further voltage applied can be to that on the first channel Voltage be identical. The microfluidic device according to the invention then gets by with only one voltage source, the first Introduce fluid into the second channel and further together with the second fluid electrokinetically through the second channel promote. Since only a single voltage is applied to the channels, the Voltage largely chosen freely and for example for electrophoretic separation of the first fluid in the second Channel can be optimally set.
Vorzugsweise ist die druckgetriebene Förderung des ersten Fluids steuerbar, so dass sie in dem zweiten Betriebszustand zur Unterstützung der Einleitung des ersten Fluids in den zweiten Kanal reduziert oder sogar abgeschaltet werden kann, um die elektrokinetische Förderung der ersten Fluids in den zweiten Kanal aus dem ruhenden Medium heraus zu ermöglichen.Preferably the is pressure driven advancement of the first fluid controllable so that it is in the second operating state for support the introduction of the first fluid into the second channel is reduced or can even be switched off to promote the electrokinetic the first fluid into the second channel out of the quiescent medium to enable.
Als Vorrichtung zur druckgetriebenen Förderung des ersten Fluids kommt insbesondere eine Pumpe in Betracht. Alternativ kann die Vorrichtung ein an einer von der Verbindungsstelle entfernten Stelle mit dem ersten Kanal verbundenes Fluidreservoir aufweisen, das höher als die Verbindungsstelle angeordnet ist, so dass das erste Fluid durch den sich aus der Höhendifferenz ergebenden hydrostatischen Druck in Richtung auf die Verbindungsstelle gefördert wird. Darüber hinaus kann der Druck zur Förderung des ersten Fluids auch anderweitig, beispielsweise durch Zentrifugalkräfte, Kapillarkräfte oder Elektrolyse, erzeugt werden.As a device for pressure driven advancement A pump is particularly suitable for the first fluid. alternative the device can be located at a location remote from the connection point have fluid reservoir connected to the first channel which is higher than the connection point is arranged so that the first fluid passes through deriving from the height difference resulting hydrostatic pressure is promoted towards the connection point. About that In addition, the pressure to promote of the first fluid in another way, for example by centrifugal forces, capillary forces or Electrolysis.
Zur weiteren Erläuterung der mikrofluidischen Einrichtung wird im Folgenden auf die Figuren der Zeichnung Bezug genommen; im Einzelnen zeigenTo further explain the microfluidic In the following, the device is referred to the figures in the drawing taken; show in detail
Die
In dem in
In dem in
Claims (3)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10318864A DE10318864B3 (en) | 2003-04-25 | 2003-04-25 | Micro-fluidic valve, for controlled introduction of fluid into channel during capillary electrophoresis, combines electrical potential gradient with curvature inducing Coanda effect |
PCT/EP2004/004346 WO2004096444A1 (en) | 2003-04-25 | 2004-04-23 | Microfluidic device for the controlled introduction of a fluid into a duct |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE10318864A DE10318864B3 (en) | 2003-04-25 | 2003-04-25 | Micro-fluidic valve, for controlled introduction of fluid into channel during capillary electrophoresis, combines electrical potential gradient with curvature inducing Coanda effect |
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DE10318864B3 true DE10318864B3 (en) | 2004-09-23 |
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DE10318864A Expired - Fee Related DE10318864B3 (en) | 2003-04-25 | 2003-04-25 | Micro-fluidic valve, for controlled introduction of fluid into channel during capillary electrophoresis, combines electrical potential gradient with curvature inducing Coanda effect |
Country Status (2)
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DE (1) | DE10318864B3 (en) |
WO (1) | WO2004096444A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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GB0812781D0 (en) * | 2008-07-11 | 2008-08-20 | Deltadot Ltd | Material separation device |
CN103240023B (en) * | 2013-05-09 | 2015-01-07 | 四川大学 | Method for triggering droplet fusion through micro scalpel |
CA3178413A1 (en) * | 2020-05-15 | 2021-11-18 | Lei Huang | Mixer for generating particles |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000070080A1 (en) * | 1999-05-17 | 2000-11-23 | Caliper Technologies Corp. | Focusing of microparticles in microfluidic systems |
DE19947496A1 (en) * | 1999-10-01 | 2001-04-05 | Hewlett Packard Co | New microfluid microchip, useful for chemical, physical and/or biological analysis or synthesis of materials in mass spectrometry, comprises a channel structure and an integrated micro spraying tip |
US20020112959A1 (en) * | 2000-10-04 | 2002-08-22 | Qifeng Xue | Unbiased sample injection for microfluidic applications |
WO2002083988A2 (en) * | 2001-04-12 | 2002-10-24 | Astra Zeneca Ab | Micro-engineered reactors |
EP0775306B1 (en) * | 1994-08-01 | 2002-10-30 | UT-Battelle, LLC | Apparatus and method for performing microfluidic manipulations for chemical analysis and synthesis |
WO2003006133A2 (en) * | 2001-07-13 | 2003-01-23 | Caliper Technologies Corp. | Microfluidic devices and systems for separating components of a mixture |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US3853695A (en) * | 1972-10-12 | 1974-12-10 | S Back | Entraining a liquid into a fiber slurry to accelerate it prior to discharge from a flow path onto a forming wire |
US4657667A (en) * | 1984-04-05 | 1987-04-14 | The University Of Toronto Innovations Foundation | Particle classifier |
DE19520298A1 (en) * | 1995-06-02 | 1996-12-05 | Bayer Ag | Sorting device for biological cells or viruses |
WO2001031322A1 (en) * | 1999-10-27 | 2001-05-03 | Caliper Technologies Corp. | Pressure induced reagent introduction and electrophoretic separation |
-
2003
- 2003-04-25 DE DE10318864A patent/DE10318864B3/en not_active Expired - Fee Related
-
2004
- 2004-04-23 WO PCT/EP2004/004346 patent/WO2004096444A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0775306B1 (en) * | 1994-08-01 | 2002-10-30 | UT-Battelle, LLC | Apparatus and method for performing microfluidic manipulations for chemical analysis and synthesis |
WO2000070080A1 (en) * | 1999-05-17 | 2000-11-23 | Caliper Technologies Corp. | Focusing of microparticles in microfluidic systems |
DE19947496A1 (en) * | 1999-10-01 | 2001-04-05 | Hewlett Packard Co | New microfluid microchip, useful for chemical, physical and/or biological analysis or synthesis of materials in mass spectrometry, comprises a channel structure and an integrated micro spraying tip |
US20020112959A1 (en) * | 2000-10-04 | 2002-08-22 | Qifeng Xue | Unbiased sample injection for microfluidic applications |
WO2002083988A2 (en) * | 2001-04-12 | 2002-10-24 | Astra Zeneca Ab | Micro-engineered reactors |
WO2003006133A2 (en) * | 2001-07-13 | 2003-01-23 | Caliper Technologies Corp. | Microfluidic devices and systems for separating components of a mixture |
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WO2004096444A1 (en) | 2004-11-11 |
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