A Microfluidic Channel Flow Cell for Electrochemical ESR
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- 作者：Andrew J. Wain ; Richard G. Compton ; Rudolph Le Roux ; Siné ; ad Matthews ; Kamran Yunus ; Adrian C. Fisher
- 刊名：Journal of Physical Chemistry B
- 出版年：2006
- 出版时间：December 28, 2006
- 年：2006
- 卷：110
- 期：51
- 页码：26040 - 26044
- 全文大小：143K
- 年卷期：v.110,no.51(December 28, 2006)
- ISSN：1520-5207
文摘
The design, fabrication, and characterization of microfluidic channel flow devices for in situ simultaneoushydrodynamic electrochemical ESR is reported. The microelectrochemical reactors consist of gold filmelectrodes situated within rectangular ducts of height 350 
m and widths in the range 500-2000 m. Thesmall dimensions of the channels result in minimal dielectric loss when centralized within a cylindrical TE011resonant cavity, leading to a high level of sensitivity. This is demonstrated by using the one-electron oxidationof N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) in acetonitrile as a model system, wherein the ESRspectra obtained for the corresponding stable radical cation are of a high signal-to-noise ratio. Signal intensityis measured as a function of flow rate for this system, and the behavior is validated by means of 3-dimensionalnumerical modeling of the hydrodynamic flow profile.
m and widths in the range 500-2000 m. Thesmall dimensions of the channels result in minimal dielectric loss when centralized within a cylindrical TE011resonant cavity, leading to a high level of sensitivity. This is demonstrated by using the one-electron oxidationof N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) in acetonitrile as a model system, wherein the ESRspectra obtained for the corresponding stable radical cation are of a high signal-to-noise ratio. Signal intensityis measured as a function of flow rate for this system, and the behavior is validated by means of 3-dimensionalnumerical modeling of the hydrodynamic flow profile.