The invention relates to a method and a microsensor for measurement of transport coefficients like diffusivity or flow velocity. The microsensor has a reservoir provided with a mouth and a transducer. The transducer has a tip placed in the mouth, which can be provided with a membrane or insert. The reservoir...http://www.google.de/patents/US6234004?utm_source=gb-gplus-sharePatent US6234004 - Method for measurement of flow velocity or diffusivity, microsensor and application of such microsensor