DE202004006069U1 - Stirrer for tensiometer and contact angle measuring apparatus comprises electric motor with shaft, on whose end rare earth magnet is mounted which rotates magnetic stirrer rod in vessel containing test liquid - Google Patents
Stirrer for tensiometer and contact angle measuring apparatus comprises electric motor with shaft, on whose end rare earth magnet is mounted which rotates magnetic stirrer rod in vessel containing test liquid Download PDFInfo
- Publication number
- DE202004006069U1 DE202004006069U1 DE202004006069U DE202004006069U DE202004006069U1 DE 202004006069 U1 DE202004006069 U1 DE 202004006069U1 DE 202004006069 U DE202004006069 U DE 202004006069U DE 202004006069 U DE202004006069 U DE 202004006069U DE 202004006069 U1 DE202004006069 U1 DE 202004006069U1
- Authority
- DE
- Germany
- Prior art keywords
- contact angle
- rare earth
- stirrer
- electric motor
- tensiometer
- 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.)
- Expired - Lifetime
Links
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 5
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 5
- 239000007788 liquid Substances 0.000 title abstract description 18
- 238000003756 stirring Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000000265 homogenisation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 241000446313 Lamella Species 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009974 thixotropic effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002996 emotional effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F35/32—Driving arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
-
- 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
- B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
- B01F33/452—Magnetic mixers; Mixers with magnetically driven stirrers using independent floating stirring elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F35/33—Transmissions; Means for modifying the speed or direction of rotation
- B01F35/331—Transmissions; Means for modifying the speed or direction of rotation alternately changing the speed of rotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F35/33—Transmissions; Means for modifying the speed or direction of rotation
- B01F35/332—Transmissions; Means for modifying the speed or direction of rotation alternately changing the direction of rotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0208—Investigating surface tension of liquids by measuring contact angle
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Rühreinrichtung für Tensiometer und Kontaktwinkelmeßgeräte entsprechend dem Oberbegriff des Anspruchs 1, zur Homogenisierung der zu untersuchenden Flüssigkeitsproben.The Invention relates to a stirring device for tensiometers and contact angle measuring devices accordingly the preamble of claim 1, for the homogenization of the to be examined Fluid samples.
Der Übergang zweier sich nicht vermischender Phasen bezeichnet man allgemein als Grenzfläche. Eine Sonderform stellt der Übergang zwischen einer flüssigen oder festen und einer gasförmigen Phase dar, welcher als Oberfläche bezeichnet wird. Aufgrund der ungleichmäßig wirkenden Kohäsions- und Adhäsionskräfte im Bereich des Phasenübergangs kommt es zu einer in der Grenzfläche tangential wirkenden Kraft, die Form und Größe der Grenzfläche beeinflußt und verantwortlich für die Grenzflächenspannung ist. Die Grenzflächenspannung ist definiert als das Verhältnis von Arbeit, die aufgewendet werden muß, um die Grenzfläche isotherm zu vergrößern:The transition two phases that do not mix are generally called as an interface. The transition is a special form between a liquid or solid and a gaseous phase represents which as surface referred to as. Because of the uneven cohesive and Adhesive forces in the area of the phase transition one occurs in the interface tangential force, which influences and is responsible for the shape and size of the interface for the Interfacial tension is. The interfacial tension is defined as the ratio of work that needs to be done to make the interface isothermal to enlarge:
Zur Messung der Grenzflächenspannung wird seit langem die Wilhelmy-Platten- oder die Du Noüy-Ring-Methode angewandt. Hierbei wird ein Meßkörper, üblicherweise in Form eines Ringes oder einer Platte, der mit einem Kraftaufnehmer verbunden ist, in die Grenzfläche bewegt. Die von der Flüssigkeitslamelle der Länge 1 herrührende am Meßkörper angreifende Kraft F ist ein Maß für die Ober- bzw. Grenzflächenspannung.to Measurement of the interfacial tension have long used the Wilhelmy plate or Du Noüy ring method. in this connection becomes a measuring body, usually in the form of a ring or a plate with a force transducer is connected to the interface emotional. The from the liquid lamella the length 1 originating on the measuring body Force F is a measure of the upper or interfacial tension.
Üblicherweise wird bei dieser Art von Messungen von vollständiger Benetzung des Meßkörpers ausgegangen, so daß der Kontaktwinkel θ null ist. Bei der Wilhelmy-Platten-Methode wird dies durch eine spezielle Oberflächenbeschaffenheit erreicht. Bei der Du Noüy-Ring-Methode wird der Ring aus der Flüssigkeit herausgezogen, bis ein Kraftmaximum entsteht, welches ein Maß für die Grenz- bzw. Oberflächenspannung ist. In diesem Fall kann ebenfalls von einem Kontaktwinkel von null ausgegangen werden, weil die Tangente der Flüssigkeitslamelle am Angriffspunkt des Ringes lotrecht nach unten gerichtet ist.Usually this type of measurement assumes complete wetting of the measuring body, so that the Contact angle θ is zero. With the Wilhelmy plate method this is achieved through a special surface texture. With the Du Noüy ring method the ring from the liquid pulled out until a maximum force is created, which is a measure of the limit or surface tension is. In this case, the contact angle can also be zero be assumed because the tangent of the liquid lamella at the point of application the ring is directed vertically downwards.
Zur Messung des Kontaktwinkels θ an einem Festkörper mit bekannten Abmessungen wird dieser in eine Flüssigkeit mit bekannter Oberflächenspannung getaucht. Hierbei wird ebenfalls die angreifende Kraft gemessen und nach obiger Gleichung der Kontaktwinkel berechnet.to Measurement of the contact angle θ a solid with known dimensions, it is converted into a liquid with a known surface tension dipped. The attacking force is also measured here and calculated the contact angle according to the above equation.
Ein
Meßgerät zur Messung
von Ober- bzw. Grenzflächenspannungen
ist beispielsweise aus
Andere Rühreinrichtungen verzichten auf den Einsatz von Elektromotoren und Dauermagneten. So können auch elektronisch gesteuerte Drehfelder mit Hilfe von Elektromagneten erzeugt werden, die durch eine Steuereinheit zyklisch umgepolt werden, so daß sich unterhalb des Probengefäßes ein rotierendes Magnetfeld entsteht, welches den Rührstab ebenso in Bewegung setzt.Other stirrers dispense with the use of electric motors and permanent magnets. So can also electronically controlled rotating fields with the help of electromagnets are generated, which are cyclically reversed by a control unit, so that a rotating one below the sample container Magnetic field is created, which also sets the stir bar in motion.
Bei besonders zähen oder thixotropen Probenflüssigkeiten reicht die magnetische Kopplung zwischen rotierendem Dauermagneten und dem Rührstab im Probengefäß häufig nicht aus, so daß dieser der Rotationsbewegung nicht folgen kann. Dies ist beispielsweise besonders bei sedimentierenden Probenflüssigkeiten und bei konzentrationsabhängigen Messungen, bei denen eine kontinuierliche Zugabe von Substanzen erforderlich ist, problematisch, weil die Homogenisierung der Probenflüssigkeit nicht mehr sichergestellt werden kann.at especially tough or thixotropic sample liquids the magnetic coupling between rotating permanent magnets is sufficient and the stir bar often not in the sample vessel out so this cannot follow the rotational movement. For example, this is especially with sedimenting sample liquids and with concentration-dependent measurements, where a continuous addition of substances is required is problematic because of the homogenization of the sample liquid can no longer be guaranteed.
Dieses Problem wird mit dem Merkmal des Anspruchs 1 gelöst.This Problem is solved with the feature of claim 1.
Mit der Erfindung wird eine stärkere magnetische Kopplung zwischen rotierendendem Dauermagnet und Rührstab im Probengefäß erreicht, so daß auch zähere oder thixotrope Probenflüssigkeiten homogenisiert werden können. Vorteil der Erfindung ist insbesondere, daß auch bestehende Geräte, die mit herkömmlichen Dauermagneten ausgestattet sind leicht umgerüstet werden können. Andererseits handelt es sich um eine vergleichsweise kostengünstige Lösung.With the invention becomes a stronger one magnetic coupling between rotating permanent magnet and stir bar in the Sample vessel reached, so that too tougher or thixotropic sample liquids can be homogenized. The advantage of the invention is in particular that existing devices that with conventional Permanent magnets are easily converted. on the other hand it is a comparatively inexpensive solution.
Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen. Die Ausgestaltung nach Anspruch 2 ermöglicht das Erreichen höherer Drehzahlen.Advantageous embodiments of the invention result from the subclaims. The embodiment according to claim 2 enables this to be achieved higher speeds.
Die Ausgestaltung nach Anspruch 3 erlaubt durch bewußte Verwirbelung eine bessere und schnellere Homogenisierung der Probenflüssigkeit.The Embodiment according to claim 3 allows a better swirling by conscious and faster homogenization of the sample liquid.
Die
Erfindung wird im folgenden anhand der
Der
Elektromotor
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202004006069U DE202004006069U1 (en) | 2004-04-17 | 2004-04-17 | Stirrer for tensiometer and contact angle measuring apparatus comprises electric motor with shaft, on whose end rare earth magnet is mounted which rotates magnetic stirrer rod in vessel containing test liquid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202004006069U DE202004006069U1 (en) | 2004-04-17 | 2004-04-17 | Stirrer for tensiometer and contact angle measuring apparatus comprises electric motor with shaft, on whose end rare earth magnet is mounted which rotates magnetic stirrer rod in vessel containing test liquid |
Publications (1)
Publication Number | Publication Date |
---|---|
DE202004006069U1 true DE202004006069U1 (en) | 2004-09-09 |
Family
ID=32981447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE202004006069U Expired - Lifetime DE202004006069U1 (en) | 2004-04-17 | 2004-04-17 | Stirrer for tensiometer and contact angle measuring apparatus comprises electric motor with shaft, on whose end rare earth magnet is mounted which rotates magnetic stirrer rod in vessel containing test liquid |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE202004006069U1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013036186A1 (en) * | 2011-09-06 | 2013-03-14 | Stefan Axelsson | Whisk |
US10258199B2 (en) | 2016-06-29 | 2019-04-16 | II Victor Anthony Almaraz | Drink mixing device |
-
2004
- 2004-04-17 DE DE202004006069U patent/DE202004006069U1/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013036186A1 (en) * | 2011-09-06 | 2013-03-14 | Stefan Axelsson | Whisk |
US10258199B2 (en) | 2016-06-29 | 2019-04-16 | II Victor Anthony Almaraz | Drink mixing device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R086 | Non-binding declaration of licensing interest | ||
R207 | Utility model specification |
Effective date: 20041014 |
|
R150 | Utility model maintained after payment of first maintenance fee after three years |
Effective date: 20070504 |
|
R079 | Amendment of ipc main class |
Free format text: PREVIOUS MAIN CLASS: B01L0011000000 Ipc: B01L0099000000 |
|
R151 | Utility model maintained after payment of second maintenance fee after six years |
Effective date: 20100511 |
|
R152 | Utility model maintained after payment of third maintenance fee after eight years | ||
R152 | Utility model maintained after payment of third maintenance fee after eight years |
Effective date: 20120420 |
|
R071 | Expiry of right |