Browse Prior Art Database

Controlled Flow Over a Quartz Microbalance in Electrochemical Systems

IP.com Disclosure Number: IPCOM000109960D
Original Publication Date: 1992-Oct-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Armstrong, M: AUTHOR [+4]

Abstract

Disclosed is a method by which an AT-cut quartz crystal microbalance is integrated into an electrochemical cell under conditions of controlled flow.

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This is the abbreviated version, containing approximately 69% of the total text.

Controlled Flow Over a Quartz Microbalance in Electrochemical Systems

       Disclosed is a method by which an AT-cut quartz crystal
microbalance is integrated into an electrochemical cell under
conditions of controlled flow.

      Mounting the quartz crystal microbalance for use in liquids
has, in the past, required the use of an insulating, sealing
elastomer on the crystal face (1).  For systems under mass-transport
control, a uniform hydrodynamic boundary layer on an unrestricted
flat surface is desired.  The limitations of the previous mounting
technique have been removed by simultaneously incorporating the
following.

      First, electrical connection between electrodes on both faces
of the crystal and an external oscillator is made through
spring-loaded pins facing the back side.  A conducting bridge
extending over the edge of the crystal, shown in Fig. 1, is used to
accommodate contact to the liquid side electrode (working electrode).
Second, the crystal is housed in a well with an elastomeric washer
placed under it to provide the requisite seal, as shown in Fig. 2.  A
reliable seal is crucial in electrochemical measurements where the
only exposed metal to the liquid should be the working electrode.
Since both electrical contacts are made to the back side of the
crystal, no sealant is required on he exposed face.  Third, instead
of using a physical device on top to press the crystal against the
elastomer, a partial vacuum is applied to the well re...