Journal
CONCEPTS IN MAGNETIC RESONANCE PART A
Volume 22A, Issue 2, Pages 61-68Publisher
WILEY
DOI: 10.1002/cmr.a.20012
Keywords
electrophoretic NMR; pulsed field gradient; electrophoresis; electromigration; stimulated echo; pulse sequence; electric field; sample heating; electroosmosis; coating; Pt black; electrolysis; polyelectrolyte; ionic strength; charged particle
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Artefacts in electrophoretic NMR experiments are investigated in detail. We identify electroosmosis, sample heating, and gas development on the electrodes as main error sources and suggest experimental strategies and setups to suppress their influence on the monitored electrophoretic mobilities. We hereby demonstrate essentially artefact-free experiments up to currents and electric fields 3 mA and 70 V/cm, respectively. (C) 2004 Wiley Periodicals, Inc.
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