Defining an electrode area

G - Physics – 01 – N

Patent

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Details

G01N 27/416 (2006.01) B01D 67/00 (2006.01) B29C 44/56 (2006.01) G01N 27/30 (2006.01)

Patent

CA 2216911

The present invention relates to a method for defining an area (4) of a layer on a porous substrate comprising compressing a volume of the substrate to produce a compressed region (8) which defines, or which in combination with an edge (7) of the substrate or of the layer defines, a boundary of the area and which substantially prevents the transport of material through or across its surface. The present invention also relates to an electrochemical sensing device comprising: a porous substrate; and an electrode (1) on one side of the substrate; wherein a region of the substrate is compressed to an extent which forms a barrier to migration of electrolyte within the substrate, the compressed region defining, or in combination with an edge of the substrate or the electrode defining, a zone on the electrode of predetermined area.

La présente invention concerne un procédé servant à définir une zone (4) d'une couche sur un substrat poreux, consistant à comprimer un volume du substrat pour produire une région comprimée (8) qui définit, seule ou en combinaison avec un bord (7) du substrat ou de la couche, une limite de zone et qui empêche sensiblement le transport de matériau à travers sa surface. La présente invention concerne également un détecteur électrochimique comprenant: un substrat poreux; et une électrode (1) sur un côté du substrat; dans lequel une région du substrat est comprimée à un degré permettant de faire obstacle à la migration d'électrolyte à l'intérieur du substrat, ladite région comprimée définissant, seule ou en combinaison avec un bord du substrat ou de l'électrode, une zone sur l'électrode d'une surface prédéterminée.

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