EP0225322A1 - Verfahren zur bestimmung des zeta-potentials von feststoffen - Google Patents
Verfahren zur bestimmung des zeta-potentials von feststoffenInfo
- Publication number
- EP0225322A1 EP0225322A1 EP85903192A EP85903192A EP0225322A1 EP 0225322 A1 EP0225322 A1 EP 0225322A1 EP 85903192 A EP85903192 A EP 85903192A EP 85903192 A EP85903192 A EP 85903192A EP 0225322 A1 EP0225322 A1 EP 0225322A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- potential
- flow
- pressure difference
- zeta potential
- measuring
- 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- Withdrawn
Links
Classifications
-
- 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
- G01N27/60—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrostatic variables, e.g. electrographic flaw testing
Definitions
- the invention relates to a method for determining the zeta potential of solids which are in contact with liquids by means of flow potential / flow current measurements.
- the zeta potential is a measurement variable that provides information about the structure of the electrochemical double layer at the solid / liquid phase boundary.
- the structure of the electrochemical double layer and thus also the sign and the level of the zeta potential greatly influence numerous processes in nature and technology as well as the processing and use behavior of materials. examples are
- the zeta potential at the solid / liquid phase boundary is in
- the liquid used for the measurement is pressed by a compressed gas through capillaries or capillary systems, which are formed by the solid bodies to be examined, and the potential difference which arises as a result of the liquid flow is measured by electrodes which are located on both sides of the capillary system .
- the zeta potential ⁇ results from the relationship
- R electrical resistance between the electrodes
- the prerequisite for the latter method is the conversion of the pressure difference; ⁇ p into an analog electrical signal.
- the linear pressure change with time is obtained by opening or closing the valve of a nitrogen or compressed air tank in a defined manner via a stepper motor.
- Both measuring principles require the use of a nitrogen or compressed air tank for the appropriate safety precautions Application must come.
- the transportation of zeta potential measuring devices to their place of use in process control is made more difficult.
- the space requirement is considerable.
- the first-mentioned measuring principle requires a considerable amount of time.
- the complex control of a stepper motor and the calculation of the quotient E p / ⁇ p from the slope of a straight line are required.
- the aim of the invention is to reduce the expenditure on equipment for determining the zeta potential and to significantly reduce the time required for the measurement process.
- the object is achieved in that a pressure difference across a measuring section is generated with the aid of a speed-controlled pump, the pressure difference and the flow potential or the flow flow are measured synchronously, the quotient
- the invention provides a device for carrying out the method in which a centrifugal pump and a 4-way valve are arranged between a measuring liquid reservoir and a measuring cell, a differential pressure sensor being located between the outlet and inlet of the measuring cell.
- FIG. 1 shows the schematic structure of the measuring device.
- a time-variable pressure difference is generated with the help of a speed-controllable centrifugal pump over a measuring section, in which the material to be measured and through which a liquid flows, synchronously with the pressure difference, the flow potential, e.g. measured as a voltage or as a current between the electrodes, and both measured values are simultaneously fed to a microprocessor for processing.
- the pressure difference is measured with a differential pressure sensor, the output signal of which is a voltage proportional to the pressure difference, which can be processed directly by the microprocessor.
- the device for carrying out the method is constructed as follows:
- a pressureless storage container 1 is accommodated, from which a speed-controllable centrifugal pump 2 sucks the measuring liquid 3 and pumps it through a replaceable measuring cell 5 via a built-in conductivity measuring cell 4 and the measuring liquid 3 flows back from the measuring cell 5 into the storage container 1, between one - And exit from the measuring cell 5, a differential pressure sensor 6 is arranged and between the conductivity measuring cell 4 and the exchangeable measuring cell 5 4-way valve 7 is arranged, through which the flow direction through the exchangeable measuring cell 5 can be changed.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (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)
- Separation Using Semi-Permeable Membranes (AREA)
- Automatic Analysis And Handling Materials Therefor (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD26502184 | 1984-07-09 | ||
DD265021 | 1984-07-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0225322A1 true EP0225322A1 (de) | 1987-06-16 |
Family
ID=5558647
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85903192A Withdrawn EP0225322A1 (de) | 1984-07-09 | 1985-07-08 | Verfahren zur bestimmung des zeta-potentials von feststoffen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0225322A1 (de) |
AU (1) | AU4602785A (de) |
WO (1) | WO1986000707A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU597442B2 (en) * | 1986-09-30 | 1990-05-31 | Colloidal Dynamics Pty. Ltd. | Determination of particle size and electric charge |
HU194998B (en) * | 1986-10-28 | 1988-03-28 | Mta Kutatasi Eszkoezoeket Kivi | Test method for detecting zeta potential of suspended substance in liquid medium |
US5245290A (en) * | 1989-02-27 | 1993-09-14 | Matec Applied Sciences, Inc. | Device for determining the size and charge of colloidal particles by measuring electroacoustic effect |
GB9011333D0 (en) * | 1990-05-21 | 1990-07-11 | Paper Chemistry Lab Inc | A method and apparatus for measuring an electrical characteristic of a fibrous dispersion |
GB9110318D0 (en) * | 1991-05-13 | 1991-07-03 | Wiggins Teape Group Ltd | Streaming potential measurement cell |
AT503235B1 (de) * | 2002-08-09 | 2008-02-15 | Volker Dr Ribitsch | Verfahren und vorrichtung zur bestimmung des strömungspotentials bzw. zeta-potentials |
AT414211B (de) * | 2002-08-09 | 2006-10-15 | Wolfgang Dipl Ing D Strohmaier | Verfahren zur bestimmung der güte bzw. funktionsfähigkeit von surfaktant |
AT515744B1 (de) | 2014-05-13 | 2016-08-15 | Anton Paar Gmbh | Verfahren und Vorrichtung zum Ermitteln des Zetapotenzials zum Charakterisieren einer Fest-Flüssig-Phasengrenze mit gesteuerter Druckprofilbeaufschlagung |
DE102023102380A1 (de) | 2023-02-01 | 2024-08-01 | Festo Se & Co. Kg | Sensoranordnung zur Durchflussmessung für einen Fluidstrom und Verfahren zur Durchflussmessung für einen Fluidstrom in einem Fluidkanal |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3130529C2 (de) * | 1981-08-01 | 1985-01-31 | Bayer Ag, 5090 Leverkusen | Vorrichtung zur Messung des Zetapotentials |
ATE26888T1 (de) * | 1981-11-09 | 1987-05-15 | Wiggins Teape Group Ltd | Apparat zur bestimmung eines elektrischen merkmals einer faser-dispersion. |
-
1985
- 1985-07-08 AU AU46027/85A patent/AU4602785A/en not_active Abandoned
- 1985-07-08 EP EP85903192A patent/EP0225322A1/de not_active Withdrawn
- 1985-07-08 WO PCT/AT1985/000018 patent/WO1986000707A1/de unknown
Non-Patent Citations (1)
Title |
---|
See references of WO8600707A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU4602785A (en) | 1986-02-10 |
WO1986000707A1 (en) | 1986-01-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19860411 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHURZ, JOSEF Inventor name: JORDE, CHRISTIAN Inventor name: HANKE, R. Inventor name: JACOBASCH, HANS, JOERG Inventor name: RIBITSCH, VOLKER Inventor name: KOERBER, H. |