EP1093578A1 - Module a microdebit pour l'analyse chimique - Google Patents

Module a microdebit pour l'analyse chimique

Info

Publication number
EP1093578A1
EP1093578A1 EP98910665A EP98910665A EP1093578A1 EP 1093578 A1 EP1093578 A1 EP 1093578A1 EP 98910665 A EP98910665 A EP 98910665A EP 98910665 A EP98910665 A EP 98910665A EP 1093578 A1 EP1093578 A1 EP 1093578A1
Authority
EP
European Patent Office
Prior art keywords
chip
module according
microflow module
microflow
thin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98910665A
Other languages
German (de)
English (en)
Inventor
Ulrich Dillner
Ernst Kessler
Johann Michael KÖHLER
Martin Zieren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institut fuer Physikalische Hochtechnologie eV
Original Assignee
Institut fuer Physikalische Hochtechnologie eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Institut fuer Physikalische Hochtechnologie eV filed Critical Institut fuer Physikalische Hochtechnologie eV
Publication of EP1093578A1 publication Critical patent/EP1093578A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0093—Microreactors, e.g. miniaturised or microfabricated reactors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • G01N25/48—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
    • G01N25/4873—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation for a flowing, e.g. gas sample
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00781—Aspects relating to microreactors
    • B01J2219/00783—Laminate assemblies, i.e. the reactor comprising a stack of plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00781—Aspects relating to microreactors
    • B01J2219/00819—Materials of construction
    • B01J2219/00824—Ceramic
    • B01J2219/00828—Silicon wafers or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00781—Aspects relating to microreactors
    • B01J2219/00819—Materials of construction
    • B01J2219/00831—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00781—Aspects relating to microreactors
    • B01J2219/00873—Heat exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00781—Aspects relating to microreactors
    • B01J2219/00889—Mixing

Definitions

  • the invention relates to a microflow module, in particular for calorimetric measurements in the context of research, quality control and on a laboratory scale and for other analytical tasks.
  • Measuring apparatuses, evaluation units and sampling devices for the applications mentioned are known in principle and are offered commercially. With the measuring method of scanning calorimetry it is possible, for example, to recognize the temperature at which a sample is converted or reacted and how large the amount of heat required for this, which is a quantity which is necessary to be known for the stated purposes. Compared to purely optical measurement methods for the same or similar purposes, the method mentioned has the advantage that optically non-transparent samples are also accessible for measurement. According to the prior art, thermostatted chambers, which can optionally be pressurized with a defined pressure, are used to take the measurement sample. A typical sample chamber of the type mentioned is e.g. can be found in the brochure of BAHR The ⁇ noanalysis GmbH DSC301 4/94.
  • a sample receiver and sensor for scanning calorimetry in particular differential scanning calorimetry, which includes a heating element and a sample receiving area, one with a recess provided support frame has a membrane-shaped thin support layer, on which a layer arrangement consisting of at least one sensor arrangement and an electrically heatable thin metal layer structure, which are separated from one another by an electrical insulation layer, is applied and provide this with a further layer receiving the sample to be examined is.
  • this device has a significantly improved time constant in relation to a single measurement compared to the otherwise known devices, it, like the other known calorimeters, only allows a very low sample throughput.
  • thermocouples are provided in the vicinity of the channel outlet, where the beads mentioned also collect and in fact the biochemical reaction is only catalyzed there, which locally heats up the liquid.
  • This microbiosensor is not very suitable for analyzing chemical reactions which are induced, for example, by mixing two reactants present in solution, since it does not allow the reaction to be recorded in its entirety. This applies in particular to very fast chemical reactions which, when using the I-shaped channel, may have taken place before the sample volume has even reached the detectable channel area. An analysis of the reaction kinetics is not possible with this microbiosensor.
  • the invention has for its object to provide a microflow module for chemical analysis, the fast sample change and thus inexpensive investigations of fast-running processes time-resolved and with small time constants and optionally also the possibility of performing a scanning calorimetry offers and can be used as a transducer for miniaturized analysis of a wide range of substances.
  • the microflow module contains a first chip, into which an extended channel area with a Y-shaped branched input area, to which two input channels adjoin, is introduced and the first chip is connected to cover a second chip, which is provided on the channel side with at least one thermosensitive thin-film element, preferably in the form of a thermopile.
  • FIG. 1 shows a first assembly of the microflow module
  • FIG. 2 shows a second assembly of the microflow module
  • FIG. 3 shows a lateral section of the complete microflow module along a section plane A-A according to FIG. 2.
  • the microflow module comprises a first chip 1, as indicated in plan view in FIG. 1, which preferably consists of glass or silicon.
  • An elongated channel region 10 is etched into this chip 1 by wet chemistry; the etching depth in the example is 100 ⁇ m with a chip 1 thickness of 500 ⁇ m.
  • the stretched channel area 10 is followed by a Y-shaped branched input area 11 with two input channels 12, 13, which is produced in the same etching step.
  • the sum of the area cross sections of the input channels 12, 13 should preferably correspond to the area cross section of the extended channel area 10.
  • the extended channel region 10 is essentially above to assign its extension length on both sides to a chamber 14 filled with a gas in the assembled state.
  • the microflow module comprises a second chip 2, which is shown in plan view with its essential components in FIG. 2.
  • This chip 2 can also be made of glass or silicon again. With a view to achieving a good signal-to-noise ratio and the greatest possible sensitivity, the most advantageous choice is glass for the first chip 1 and silicon for the second chip 2.
  • thermosensitive thin-film element 21 is formed by three thermopiles 211, 212, 213, each of which consists of 48 BiSb / Sb thermocouple pairs.
  • thermopiles are arranged with respect to the channel 10 on the chip 2 such that the hot contact points 214 arranged symmetrically to the longitudinal axis of the channel essentially capture the channel 10, whereas the cold contact points 215 in heat sink areas of the microflow module, in the example on the support frame 27, are arranged.
  • twenty-three thermocouples are on one side and twenty-four thermocouples on the opposite side of the channel, one thermocouple forming the contact between the two thermocouple areas.
  • Each of these thermopiles 211, 212, 213 is furthermore assigned, separated by the electrical insulation layer 22, an electrical thin-film heating element 23 such that it only covers the channel region 10.
  • each thin-film heating element is formed by a meandered NiCr layer.
  • the thin-film heating element 25 is preferably designed such that it also covers the areas of the input channels 12, 13. All of the last-mentioned electrical assemblies 211 to 213, 23 and 25 are covered with a final second insulation layer 29.
  • This layer 29 is designed as a lacquer layer and serves to protect the metallic functional layers against mechanical and chemical influences and to avoid electrical coupling between the hot contact points via the liquid.
  • the two chips 1 and 2 mentioned are connected to one another by an adhesive 28, as indicated in a section along the plane AA in FIG. 2. Anodic bonding can also be considered for the connection.
  • the input channels 12, 13 are connected to corresponding supply lines, not shown.
  • a microflow module designed in this way can be calibrated and used as described below.
  • the microflow module is calibrated in such a way that distilled water is passed through the two channels 12, 13 at a defined flow rate into the extended channel area 10.
  • the following procedure is carried out for each of the thermopiles 211, 212, 213 provided in the example: a defined heating power is applied to the thin-film heater assigned to each heating element and the response signal of the associated thermopile is recorded. This process is repeated for different heating powers, which are typically between 1 ⁇ W - 1 mW, and different flow rates, which in the example are between 0.1 - 50 ⁇ l / min.
  • calibration curves or calibration hyper surfaces are obtained for each thermopile, which represent the thermoelectric signal as a function of the heating power fed in and the flow rate.
  • Kahbrier curves can be used in the analysis of chemical reactions for the evaluation of individual thermopile signals in order to determine the power fed in by the reaction from the signal level.
  • the calibration of the Thermopiles if they are connected in series to be able to evaluate an integral signal.
  • thermopiles 211, 212, 213 are to be connected in series in this example.
  • the reagents are mixed in the Y-shaped entrance area and a chemical reaction begins.
  • the heat that is converted is integrally detected by the thermopiles, a thermal equilibrium being established over time; the initially rising thermoelectric signal saturates.
  • the microflow module is to be used as a scanning calorimeter.
  • a liquid to be examined for characteristic temperatures, phase transitions, crystallization processes or the like is fed through the input channels 12, 13 to the device.
  • the liquid is heated more and more by a linearly increasing, optionally sinusoidal or other modulated electrical heating power application of the thin-film heaters 23 and 25 and the associated thermoelectric signal is detected.
  • This signal shows a proportional increase in the thermoelectric signals following the heating power with slight deviations from the linearity at the temperatures corresponding to a specific heating power at which heat is consumed or released by physicochemical processes. The location of these deviations over time corresponds to the associated heating power and temperature.
  • thermoelectric signal with the linearly interpolated undisturbed signal as the baseline.
  • a reactant in solution should flow in through the first input channel, while a liquid, such as distilled water, which is initially free of reactants, is fed in through the second input channel.
  • This second input channel is provided with a supply hose, which is provided with a T-branching piece, not shown, to which a reservoir with an analyte liquid is connected, in such a way that analyte volumes defined in a timed manner can be added to the carrier stream.
  • analyte volumes With sufficiently small analyte volumes and a low flow rate, the entire chemical reaction takes place in the channel region 10 and is therefore detectable in its entirety.
  • analyte volumes there are defined analyte volumes in this mode of operation, so that here, in addition to a statement about the detected concentration, one can also obtain information about the amount of substance detected.
  • thermopiles used in the example have the advantage over thermoresistive measuring elements, the alternative use of which is also possible within the scope of the invention, that they do not have to be addressed with an electrical signal.
  • thermoresistive measuring elements the alternative use of which is also possible within the scope of the invention, that they do not have to be addressed with an electrical signal.
  • Example used thermopile has an expansion in the direction of
  • thermopiles Channel longitudinal axis of 3.2 mm, each covering a channel volume of 0.64 ⁇ l with the channel geometry provided here.
  • the spacing of the thermopiles from one another is chosen so that analyzer volumes up to the named size are not at all
  • thermoelectric signals of each individual thermopile are read out individually, which means that the time and location of the flow rate are also resolved
  • the thin-film heating element 25 With the help of the thin-film heating element 25 provided, extremely fast chemical reactions at low flow rates can be simulated, in which the sample volume forms the first thermopile Reached the point in time at which the simulated reaction would have practically been completed.
  • the thin-film heating element 25 can advantageously also be used when performing the scanning calorimetry described above, in order to be able to couple in a greater overall power. In addition, its use offers the possibility of thermally activating chemical reactions and then subsequently thermoelectrically recording them, as described above.

Abstract

L'invention porte sur un module à microdébit pour l'analyse chimique. Elle vise à rendre possible un changement rapide d'échantillon de manière à réaliser des analyses à moindre frais, à résolution temporelle et à faibles constantes de temps, et à pouvoir effectuer des test calorimétriques à balayage. A cette fin, le module à microdébit consiste en une première puce (1) dans laquelle est insérée une zone de conduit (10) allongée en forme de Y, donc une zone d'entrée ramifiée (11), à laquelle sont reliés deux canaux d'entrée (12, 13), la première puce (1) étant reliée par chevauchement à une seconde puce (2) qui comporte au moins un élément à couche mince (21) thermosensible du côté du conduit.
EP98910665A 1997-02-21 1998-02-13 Module a microdebit pour l'analyse chimique Withdrawn EP1093578A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1997107044 DE19707044C1 (de) 1997-02-21 1997-02-21 Mikroflußmodul für kalorimetrische Messungen
DE19707044 1997-02-21
PCT/EP1998/000836 WO1998037408A1 (fr) 1997-02-21 1998-02-13 Module a microdebit pour l'analyse chimique

Publications (1)

Publication Number Publication Date
EP1093578A1 true EP1093578A1 (fr) 2001-04-25

Family

ID=7821124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98910665A Withdrawn EP1093578A1 (fr) 1997-02-21 1998-02-13 Module a microdebit pour l'analyse chimique

Country Status (4)

Country Link
EP (1) EP1093578A1 (fr)
JP (1) JP2001513882A (fr)
DE (1) DE19707044C1 (fr)
WO (1) WO1998037408A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6703246B1 (en) * 1999-07-06 2004-03-09 The Dow Chemical Company Thermal method and apparatus
EP1627218A2 (fr) * 2003-04-28 2006-02-22 Arizona Board of Regents, acting for and on behalf of, Arizona State University Biodetecteur thermoelectrique pour analytes dans un gaz
JP4380264B2 (ja) * 2003-08-25 2009-12-09 カシオ計算機株式会社 接合基板及び基板の接合方法
DE10355126A1 (de) * 2003-11-24 2005-06-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Messung der bei chemischsen oder physikalischen Umsetzungen frei werdenden Wärme
FR2894668B1 (fr) * 2005-12-08 2008-01-18 Univ Maine Calorimetre permettant l'etude d'une reaction chimique en continu
JP4851831B2 (ja) * 2006-04-07 2012-01-11 学校法人明治大学 微小熱量測定装置および微小熱量測定方法
DE102007019695B4 (de) 2007-04-24 2009-08-13 Analytik Jena Ag Küvette für die optische Analyse kleiner Volumina
CH702328A2 (de) 2009-12-01 2011-06-15 Acl Instr Ag Wärmefluss-Kalorimeter.
DE102012003863B3 (de) * 2012-02-22 2013-03-07 Technische Universität Bergakademie Freiberg Vorrichtung und Verfahren zur Bestimmung der Wirkung von Nanopartikelmaterialien auf lebende Zellen durch Messung der Wärmeleistungsproduktion der Zellen mittels Chip-Kalorimeter
EP2972259B1 (fr) * 2013-03-15 2021-12-08 The Charles Stark Draper Laboratory, Inc. Système et procédé pour un calorimètre microfluidique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4408352C2 (de) * 1994-03-12 1996-02-08 Meinhard Prof Dr Knoll Miniaturisierter stofferkennender Durchflußsensor sowie Verfahren zu seiner Herstellung
DE4429067C2 (de) * 1994-08-17 2002-11-28 Inst Physikalische Hochtech Ev Probenaufnehmer und Sensor für die Scanning-Kalorimetrie
DE4438785C2 (de) * 1994-10-24 1996-11-07 Wita Gmbh Wittmann Inst Of Tec Mikrochemische Reaktions- und Analyseeinheit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9837408A1 *

Also Published As

Publication number Publication date
JP2001513882A (ja) 2001-09-04
DE19707044C1 (de) 1998-08-06
WO1998037408A1 (fr) 1998-08-27

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