EP0229051A1 - Process and device for measuring the electrokinetic potential of fibres, powders and the like - Google Patents
Process and device for measuring the electrokinetic potential of fibres, powders and the likeInfo
- Publication number
- EP0229051A1 EP0229051A1 EP19850903191 EP85903191A EP0229051A1 EP 0229051 A1 EP0229051 A1 EP 0229051A1 EP 19850903191 EP19850903191 EP 19850903191 EP 85903191 A EP85903191 A EP 85903191A EP 0229051 A1 EP0229051 A1 EP 0229051A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring
- diaphragm
- powders
- zeta potential
- measuring cell
- 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- Withdrawn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
- G01N27/26—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
Definitions
- the invention relates to a method and a device for measuring the electrokinetic potential of fibers, powders, etc. by determining the electroosmotic liquid transfer. Measurements of the electrokinetic or zeta potential of solids provide important information about technologically relevant material properties, e.g. about soiling and washing behavior, processability of fiber materials, etc.
- a device for measuring the electroosmotic liquid transfer which consists of a measuring cell (diaphragm) to be installed in a glass apparatus via ground joints, to which a DC voltage is applied via Ag / Ag 2 SO 4 or calomel electrodes, which is what leads to a migration of the fluid through the diaphragm.
- a voltage of 100 to 500 V is required, which can endanger the operating personnel.
- the liquid transfer is due to displacement of the liquid meniscus in a graduated measuring capillary measured (Deutsche lext iltechnik 20 (1 970) issue 1 0, p. 651; WP G 01 N / 222 81 9).
- the zeta potential is determined using the v. Helmholtz-S Molukhovsky equation.
- V is the rate of migration of the measuring liquid in the
- movably arranged platinum electrodes are guided close to the diaphragm and first the electrical resistance of the diaphragm filled with the measurement solution is determined.
- the measuring solution is then removed from the apparatus and, after thorough rinsing of the apparatus and diaphragm, it is filled with M / 10 KCl solution and the resistance of the diaphragm thus filled is determined.
- the value of x results from the relationship
- the value of x N / 10 KCl can be found in table values. Since resistance measurements on the diaphragm are inaccurate, a relatively high error occurs. In addition, a high cleaning effort is required when changing the measuring liquid.
- the aim of the invention is to measure the electrokinetic or zeta potential of fiber materials more easily and precisely.
- the invention has for its object to solve the measurement of the electroosmotic liquid transfer in a novel way.
- the object is achieved in that a voltage drop is measured directly on a diaphragm, a liquid transfer is determined at different diaphragm densities and the zeta potential according to the following formulas
- the invention further provides a device for carrying out the method in which a diaphragm space of a measuring cell is delimited by displaceable stamps having perforated palladium electrodes and the palladium electrodes have connections for supplying voltage.
- a diaphragm space of a measuring cell is delimited by displaceable stamps having perforated palladium electrodes and the palladium electrodes have connections for supplying voltage.
- voltages of 50 V are sufficient.
- Resistance measurements on the diaphragm are also omitted.
- a simplified measuring cell makes measurements of the electrokinetic potential easier and more precise.
- FIG. 1 shows the schematic dismantling of the device and FIG. 2 shows a section through the measuring cell of the device.
- the measuring cell 1 consists of a glass body 2, which is closed by union nuts 3.
- the union nuts 3 represent guides for the displaceable punch 4, which form the diaphragm space 5 due to their limitation.
- the punches 4 On the end faces facing the diaphragm space 5, the punches 4 have perforated palladium electrodes 6, which have a connection to the voltage supply 7.
- the storage vessels for the measuring solution 10 and the measuring capillary 6 are placed on the measuring cell 1 via ground joints. The function of the device is demonstrated on the basis of the measurement on a fiber. The measurement is carried out in such a way that the fibrous material is suspended in the measuring liquid.
- the measuring cell is brought into the vertical position, with only one electrode in the measuring cell, namely at the lower end.
- a plastic funnel is screwed onto the upper end and the pulp suspension is filled into the measuring cell and the pulp mass is filtered off on the electrode. It is important to ensure that the resulting diaphragm is always covered with the measuring liquid (avoidance of air bubbles).
- the second electrode is installed in the measuring cell in such a way that a diaphragm of relatively loose packing is created.
- the measuring cell as described above, is completed and the device with the measuring liquid; filled to the extent that the meniscus is at the beginning of the measuring capillary 8. The fine adjustment of the meniscus takes place with the aid of the displacement body 11.
- the diaphragm By applying a voltage, a liquid flow is generated through the diaphragm, the speed of which is determined by measuring the time in which a certain volume travels in the measuring capillary. The measurement of the voltage drop and the electrode spacing is also necessary for the evaluation. With a known measuring cell cross section and known fiber weight, the packing density d can be calculated. The diaphragm is then compressed in stages by changing the electrode spacing and the sizes U, D and L are determined for each packing density.
- the zeta potential is determined using the following relationships
- L M length of the measuring cell
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Un procédé pour mesurer le potentiel électrocinétique de fibres, poudres et matériaux similaires en déterminant le transfert électro-osmotique des liquides. Les mesures du potentiel électrocinétique ou zéta de solides fournissent d'importantes informations sur les propriétés technologiquement importantes du matériau. Pour déterminer le potentiel zéta, on mesure un champ de tension directement sur un diaphragme (5), on détermine un transfert de liquides avec différentes densités de diaphragme et on calcule le potentiel zéta. L'invention comporte également un dispositif pour mettre en oeuvre le procédé.A method for measuring the electrokinetic potential of fibers, powders and similar materials by determining the electro-osmotic transfer of liquids. Measurements of the electrokinetic or zeta potential of solids provide important information about the technologically important properties of the material. To determine the zeta potential, a voltage field is measured directly on a diaphragm (5), a transfer of liquids with different diaphragm densities is determined and the zeta potential is calculated. The invention also includes a device for implementing the method.
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/AT1985/000017 WO1987000285A1 (en) | 1985-07-08 | 1985-07-08 | Process and device for measuring the electrokinetic potential of fibres, powders and the like |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0229051A1 true EP0229051A1 (en) | 1987-07-22 |
Family
ID=3682202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850903191 Withdrawn EP0229051A1 (en) | 1985-07-08 | 1985-07-08 | Process and device for measuring the electrokinetic potential of fibres, powders and the like |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0229051A1 (en) |
WO (1) | WO1987000285A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9021830D0 (en) * | 1990-10-08 | 1990-11-21 | Wiggins Teape Group Ltd | Electrokinetic potential measuring electrodes |
US5599046A (en) * | 1994-06-22 | 1997-02-04 | Scientific Games Inc. | Lottery ticket structure with circuit elements |
US5475205A (en) * | 1994-06-22 | 1995-12-12 | Scientific Games Inc. | Document verification system |
DE19540206C2 (en) * | 1995-10-28 | 1999-07-01 | Inst Polymerforschung Dresden | Device for determining the zeta potential of fine particles |
DE19724014B4 (en) * | 1997-06-06 | 2006-11-09 | Heckmann, Klaus, Prof. Dr. | Method and apparatus for determining the zero charge of electrically charged colloidal and / or suspended particles |
DE10159566B4 (en) * | 2001-11-30 | 2007-04-26 | Leibniz-Institut Für Polymerforschung Dresden E.V. | Device for determining the zeta potential and the permeability of membranes |
-
1985
- 1985-07-08 WO PCT/AT1985/000017 patent/WO1987000285A1/en unknown
- 1985-07-08 EP EP19850903191 patent/EP0229051A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO8700285A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1987000285A1 (en) | 1987-01-15 |
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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: 19870916 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHURZ, JOSEF Inventor name: JACOBASCH, JOERG Inventor name: BAUBOECK, GUENTHER |