Millisecond timescale reactions observed via X-ray spectroscopy in a 3D microfabricated fused silica mixer

Huyke, D.A.; Ramachandran, A.; Ramirez-Neri, O.; Guerrero-Cruz, J.A.; Gee, L.B.; Braun, A.; Sokaras, D.; Garcia-Estrada, B.; Solomon, E.I.; Hedman, B.; Delgado-Jaime, M.U.; DePonte, D.P.; Kroll, T.; Santiago, J.G.

doi:10.1107/S1600577521003830

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Figure 6
Results of X-ray experiments and comparison with predictions from simulations. (a) Reference K-edge XAS spectra of ferricyanide $[{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{3-}]$ reactant and ferrocyanide $[{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{4-}]$ product. The inset shows a zoom into the K pre-edge region. (b) Reference Fe Kβ XES spectra for the same species. (c) Predicted (line) and measured (symbols) depth-averaged, unreacted sample fraction M_R versus the sample residence time t. The shaded area near the line shows the range of possible M_R given variations in sample and sheath species diffusivities of 10%. Vertical uncertainty bars denote the standard error of the X-ray measurement and horizontal uncertainty bars denote the sample residence time uncertainty. In this diffusion-limited scenario, mixing and reactions occur simultaneously. We therefore report the average sample residence time since sample species were exposed to sheath species. Data are for Q_sa = 30 µl min⁻¹, Q_sh = 1 ml min⁻¹, $[{\left[{{\rm{Fe}}\left({{\rm{CN}}}\right)_6^{3-}}\right]_0}]$ = 40 mM, and [H₂Asc]₀ = 200 mM, and pH = 10.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 28| Part 4| July 2021| Pages 1100-1113

https://doi.org/10.1107/S1600577521003830

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