Wall-jet electrode linear sweep voltammetry

Compton, Richard G.; Fisher, Adrian C.; Latham, M. H.; Brett, Christopher M. A.; Brett, Ana Maria C.F. Oliveira

doi:10.1021/j100200a028

Cited by 16 publications

(16 citation statements)

References 8 publications

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“…The fluid cell was designed to produce a vertically impinging fluid jet onto the sample surface within 2 mm of the AFM probe contact. This ''wall-jet'' (Compton et al, 1992) flow configuration produced an effective residence time at the tip-sample contact of approximately 60 ms, which aided the study of transient processes.…”

Section: Methodsmentioning

confidence: 99%

Dissolution kinetics and topographic relaxation on celestite (001) surfaces: The effect of solution saturation state studied using Atomic Force Microscopy

Bose

Higgins

2008

Geochimica et Cosmochimica Acta

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Section: Methodsmentioning

confidence: 99%

Dissolution kinetics and topographic relaxation on celestite (001) surfaces: The effect of solution saturation state studied using Atomic Force Microscopy

Bose

Higgins

2008

Geochimica et Cosmochimica Acta

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“…19, 20 In this work, the optimized 3D-printed WJE device was compared with a 3D-printed TLE device. To ensure an accurate comparison, the TLE channel size is the same as the WJE outlet channel size where the electrode is housed (750 μm × 750 μm).…”

Section: Resultsmentioning

confidence: 99%

“…A wall jet electrode (WJE) is an alternative electrode configuration that has been reported for tubing-based systems. 18–20 A WJE design (Figure 2A) allows the sample to hit the electrode embedded at the end the sample inlet channel, perpendicular to the inlet flow stream, which has proven to enhance mass transport and thus increase sensitivity. Although there are a few reports showing the integration of WJE in microfluidic devices, they used glass microchannels (requiring clean room for fabrication) and the electrode has to be manually aligned with the separation channel since the electrode is separate from the microchip.…”

Section: Introductionmentioning

confidence: 99%

Microchip-based electrochemical detection using a 3-D printed wall-jet electrode device

Munshi

Martin

2016

Analyst

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Three dimensional (3-D) printing technology has evolved dramatically in the last few years, offering the capability of printing objects with a variety of materials. Printing microfluidic devices using this technology offers various advantages such as ease and uniformity of fabrication, file sharing between laboratories, and increased device-to-device reproducibility. One unique aspects of this technology, when used with electrochemical detection, is the ability to produce a microfluidic device as one unit while also allowing the reuse of the device and electrode for multiple analyses. Here we present an alternate electrode configuration for microfluidic devices, a wall-jet electrode (WJE) approach, created by 3-D printing. Using microchip-based flow injection analysis, we compared the WJE design with the conventionally used thin-layer electrode (TLE) design. It was found that the optimized WJE system enhances analytical performance (as compared to the TLE design), with improvements in sensitivity and the limit of detection. Experiments were conducted using two working electrodes – 500 μm platinum and 1 mm glassy carbon. Using the 500 μm platinum electrode the calibration sensitivity was 16 times higher for the WJE device (as compared to the TLE design). In addition, use of the 1 mm glassy carbon electrode led to limit of detection of 500 nM for catechol, as compared to 6 μM for the TLE device. Finally, to demonstrate the versatility and applicability of the 3-D printed WJE approach, the device was used as an inexpensive electrochemical detector for HPLC. The number of theoretical plates was comparable to the use of commercially available UV and MS detectors, with the WJE device being inexpensive to utilize. These results show that 3D-printing can be a powerful tool to fabricate reusable and integrated microfluidic detectors in configurations that are not easily achieved with more traditional lithographic methods.

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“…Computational procedures have also been employed [16] to deduce these parameters; the exploitation of the highly non-uniform accessibility for better discrimination between electrode reaction mechanisms than at uniformly accessible electrodes has been demonstrated [17]. Potential-step chronoamperometry [18,19] and linear sweep voltammetry [20] have also been investigated and the limitations of using approximate theoretical responses examined.…”

mentioning

confidence: 99%

“…In principle, kinetic and mechanistic information can also be obtained and the response analyzed according to the criteria described in Refs. [14][15][16][17][18][19][20]. The following section will discuss how cells should be designed to ensure that wall-jet hydrodynamics can be achieved and the various detection strategies which can be employed.…”

mentioning

confidence: 99%