The VersaSCAN SDC integrates the Base with a VersaSTAT, a PTFE machined head, and a peristaltic pump. The SDC technique confines the electrochemical measurement to the small droplet of electrolyte, defining the area of the electrode/electrolyte interface. SDC adds spatial resolution to applications such as kinetics, corrosion, fluid-flow studies, and any application where a small area on a sample needs to be investigated without cutting the sample or subjecting areas to different electrolyte exposure times.
Scanning Droplet System (SDC) uses a compact peristaltic pump to force electrolyte through a small diameter tube and into a specifically designed head. This PTFE-based SDC head is machined to allow electrolyte to flow past an installed Reference Electrode and then to a port at the base of the head.
When the head is positioned sufficiently close to the sample a droplet forms between the head and sample. Tubing is also connected to an output port of the PTFE head. A second channel of the same peristaltic pump is then used to draw electrolyte past an installed Counter Electrode and out of the system. SDC experiments can be configured to either:
Since electrochemistry occurs at an electrode/electrolyte interface, only the portion of the sample that is in contact with the droplet is being measured. This allows experiments to study a small area of a large sample, without cutting the sample and thus limiting edge effects.
When running, the SDC pump creates a flowing droplet. SDC’s pump velocity can be tuned to study different effects of flow rate.
|Current Ranges and Resolution|
|VersaSTAT 4||4nA to 1A standard; 120fA on 4nA range|
|VersaSTAT 3F||4nA to 650mA standard; 120fA on 4nA range|
|VersaSTAT 3||200nA to 650 mA standard; 6pA on 200nA range|
|Counter Electrode||Pt wire|