EP0035878A2
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EP
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Method and apparatus for measuring interfacial electrokinetic phenomena
Assignee: Kureha Corp
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Filing: 1981-03-05
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Granted: —
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Expires: 2001-03-05
Abstract
Abstract Amethodofandapparatusformeasuringinterfacialelec- trokinetic phenomena such as electrophoresis by applying stationary electric field to a sample, wherein the voltage between two points (50,51) in the sample other than the electrodes (30,31) for an electric current application is detected and an electric current is supplied to the sample to maintain the detected voltage constant, and the sample is preheated while the particles are substantially kept in a stationary state by applying an alternating voltage prior to the application of the stationary voltage, to thereby obtain the mobility of the charged particle in the sample with high accuracy.
Inventors
- 👤 Yoshio Kawai
- 👤 Kiyoshi Kitagawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 03:44
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/447; G01N27/44704; G01N27/44713
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
43 words
A method of measuring interfacial electrokinetic phenomena of a sample in a chamber by the application of stationary electric field by way of electrodes to the sample, characterised by the step of controlling the conditions inside the chamber under which measurements are made.
Claim 2
Independent Claim
43 words
A method of measuring interfacial electrokinetic phenomena of a sample in a chamber by the application of stationary electric field by way of electrodes to the sample, characterised by the step of controlling the conditions inside the chamber under which measurements are made.
Claim 3
Dependent Claim
82 words
A method of measuring interfacial electrokinetic phenomena according to claim 1, characterised in that said step of controlling the measuring conditions includes supplying AC (alternating,current) to the sample to be measured prior to the measurement of the interfacial electrokinetic phenomena during the application of the measuring stationary electric field to said sample so that electric power is previously imparted to said sample at a rate substantially equal to that at which it is imparted upon application of the measuring stationary electric field.
Claim 4
Dependent Claim
46 words
A method of measuring interfacial electrokinetic phenomena according to claim 2, characterised in that the AC is of such a frequency that the particles to be measured in said sample can be regarded as being in a stationary state upon measurement of the electrophoretic mobility thereof.
Claim 5
Dependent Claim
64 words
A method of measuring interfacial electrokinetic phenomena according to claim 1, 2 or 3, characterised in that said step of controlling the measuring conditions includes detecting the voltage between two points situated between and other than at said electrodes in the sample to be measured, and controlling the current supplied to said sample so that the voltage detected between said two points is constant.
Claim 6
Dependent Claim
28 words
A method of measuring interfacial electrokinetic phenomena according to claim 1, 2, 3 or 4, characterised in that the electrophoretic mobility of particles in the sample is measured.
Claim 7
Dependent Claim
38 words
Apparatus for measuring interfacial electrokinetic phenomena having a power source system for applying an electric field to a sample to be measured, characterised in that said power source system (7) has the function of controlling the measuring conditions.
Claim 8
Dependent Claim
38 words
Apparatus for measuring interfacial electrokinetic phenomena having a power source system for applying an electric field to a sample to be measured, characterised in that said power source system (7) has the function of controlling the measuring conditions.
Claim 9
Dependent Claim
73 words
Apparatus according to claim 6, characterised in that said power source system comprises a DC (direct current) power source (A1) for applying the measuring electric field to the sample to be measured, and AC power source (A 2 ) for supplying AC to said sample prior to the application of the measuring electric field and an output selection circuit (C) for selecting either of the DC power source or the AC power source.
Claim 10
Dependent Claim
50 words
Apparatus according to claim 7, for measuring the electrophorectic mobility of particles in the sample, characterised in that the AC output from the AC power source (A 2 ) is of such a frequency that said particles to be measured can be regarded as being in a substantially stationary state.
Claim 11
Dependent Claim
62 words
Apparatus according to claim 6, 7 or 8, characterised in that the power source system comprises a pair of current supply electrodes (30,31), that a pair of voltage detecting terminals (50,51) is situated between said pair of current supply electrodes (30,31) and that a device (43,47) for controlling the current so that the voltage detected between said voltage detecting terminals is provided.
References Cited (Backward Citations)
No citation records indexed.
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