EP0225322A1 - Procede pour determiner le potentiel electrocinetique zeta de matieres solides - Google Patents

Procede pour determiner le potentiel electrocinetique zeta de matieres solides

Info

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Withdrawn
Application number
EP85903192A
Other languages
German (de)
English (en)
Inventor
Hans Jörg JACOBASCH
R. Hanke
H. Körber
Josef Schurz
Volker Ribitsch
Christian Jorde
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.)
Forschungsanwendungsgesellschaft Mbh
Original Assignee
Forschungsanwendungsgesellschaft Mbh
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 Forschungsanwendungsgesellschaft Mbh filed Critical Forschungsanwendungsgesellschaft Mbh
Publication of EP0225322A1 publication Critical patent/EP0225322A1/fr
Withdrawn legal-status Critical Current

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)

Abstract

Procédé pour déterminer le potentiel électrocinétique zeta dans lequel la pression différentielle nécessaire pour la mesure, engendrée sur un intervalle de mesure, est obtenue à l'aide d'une pompe commandée en agissant sur la vitesse de rotation de celle-ci et où le potentiel d'écoulement ou le courant sont mesurés en synchronisme avec la pression différentielle et où le potentiel zeta est ensuite calculé de manière connue. Avec ce procédé, on diminue le déploiement d'appareillage ainsi que le temps nécessaire à la mesure du potentiel zeta électrocinétique.
EP85903192A 1984-07-09 1985-07-08 Procede pour determiner le potentiel electrocinetique zeta de matieres solides Withdrawn EP0225322A1 (fr)

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 (fr) 1987-06-16

Family

ID=5558647

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85903192A Withdrawn EP0225322A1 (fr) 1984-07-09 1985-07-08 Procede pour determiner le potentiel electrocinetique zeta de matieres solides

Country Status (3)

Country Link
EP (1) EP0225322A1 (fr)
AU (1) AU4602785A (fr)
WO (1) WO1986000707A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE145986T1 (de) * 1986-09-30 1996-12-15 Colloidal Dynamics Pty Ltd Bestimmung der teilchengrösse und der elektrischen ladung
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
AT414211B (de) * 2002-08-09 2006-10-15 Wolfgang Dipl Ing D Strohmaier Verfahren zur bestimmung der güte bzw. funktionsfähigkeit von surfaktant
AT503235B1 (de) * 2002-08-09 2008-02-15 Volker Dr Ribitsch Verfahren und vorrichtung zur bestimmung des strömungspotentials bzw. zeta-potentials
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)

* Cited by examiner, † Cited by third party
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
DE3276195D1 (en) * 1981-11-09 1987-06-04 Wiggins Teape Group Ltd Apparatus for determining an electrical characteristic of a fibrous dispersion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8600707A1 *

Also Published As

Publication number Publication date
AU4602785A (en) 1986-02-10
WO1986000707A1 (fr) 1986-01-30

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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.