Global Patent Index - EP 1315851 A1

EP 1315851 A1 2003-06-04 - METHOD FOR ETCHING AT LEAST ONE ION TRACK TO A PORE IN A MEMBRANE AND ELECTROLYTIC CELL FOR PREPARING SAID MEMBRANE

Title (en)

METHOD FOR ETCHING AT LEAST ONE ION TRACK TO A PORE IN A MEMBRANE AND ELECTROLYTIC CELL FOR PREPARING SAID MEMBRANE

Title (de)

VERFAHREN ZUM ÄTZEN MINDESTENS EINER IONENSPUR ZU EINER PORE IN EINER MEMBRANE UND ELEKTROLYTISCHE ZELLE ZUR PRÄPARIERUNG EINER SOLCHEN

Title (fr)

PROCEDE D'ATTAQUE D'AU MOINS UNE PISTE IONIQUE POUR OBTENIR UN PORE DANS UNE MEMBRANE ET CELLULE ELECTROLYTIQUE DESTINEE A PREPARER LADITE MEMBRANE

Publication

EP 1315851 A1 (DE)

Application

EP 01962978 A

Priority

  • DE 10044565 A
  • EP 0109911 W

Abstract (en)

[origin: WO0220877A1] A membrane consisting of dielectric material such as an organic polymer, separates two chambers of an electrolytic cell from each other. The membrane is produced using an etching solution which is provided in one of the chambers. Said etching solution contains active etching ions which etch the organic polymer. The other chamber contains a solution which does not have an etching action. An electrical field is generated through the membrane with an electrode that is dipped into the respective electrolytes and a voltage source connecting the two electrodes. The etching process makes its way along the ion tracks on one side, through the membrane and first produces one funnel-shaped pore per ion track. Immediately prior to the breakthrough, the ions which do not have an etching action begin to penetrate the still existent thin layer with fine pores - the active layer - and to displace the ions with an etching action at the exit point. An intensified electric current, driven by the adjacent field, is established. The etching process on the floor of the pore shifts sideways according to the concentration of etching ions still present. The process can be stopped by deactivating the field and washing the membrane and the sole size, i.e. the active layer size, adjusted. A membrane produced in this way can be operated as an electrochemical valve and can be used with one or more pores as a sensor or with many pores to control concentration.

IPC 1-7 (main, further and additional classification)

C25F 3/02; B01D 67/00; B01D 69/02; B01D 69/14

IPC 8 full level (invention and additional information)

B01D 67/00 (2006.01); C25F 3/02 (2006.01)

CPC (invention and additional information)

C25F 3/02 (2013.01); B01D 67/003 (2013.01); B01D 67/0032 (2013.01); B01D 2325/26 (2013.01)

Citation (search report)

See references of WO 0220877A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

EPO simple patent family

WO 0220877 A1 20020314; DE 10044565 A1 20020404; DE 10044565 B4 20050630; EP 1315851 A1 20030604; US 2005072689 A1 20050407; US 7001501 B2 20060221

INPADOC legal status


2017-02-15 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20160908

2008-12-24 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20081119

2008-12-17 [RAP1] TRANSFER OF RIGHTS OF AN APPLICATION

- Owner name: GSI HELMHOLTZZENTRUM FUER SCHWERIONENFORSCHUNG GMB

2003-06-04 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20030204

2003-06-04 [AK] DESIGNATED CONTRACTING STATES:

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR