Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 14854-14863 |
| Number of pages | 10 |
| Journal | Journal of physical chemistry C |
| Volume | 121 |
| Issue number | 27 |
| DOIs | |
| Publication status | Published - 13 Jul 2017 |
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Modeling of Unidirectional-Overloaded Transition in Catalytic Tubular Microjets. / Klingner, Anke; Khalil, Islam S. M.; Magdanz, Veronika; Fomin, Vladimir M.; Schmidt, Oliver G.; Misra, Sarthak.
In: Journal of physical chemistry C, Vol. 121, No. 27, 13.07.2017, p. 14854-14863.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Modeling of Unidirectional-Overloaded Transition in Catalytic Tubular Microjets
AU - Klingner, Anke
AU - Khalil, Islam S. M.
AU - Magdanz, Veronika
AU - Fomin, Vladimir M.
AU - Schmidt, Oliver G.
AU - Misra, Sarthak
PY - 2017/7/13
Y1 - 2017/7/13
N2 - A numerical time-resolved model is presented for predicting the transition between unidirectional and overloaded motion of catalytic tubular microjets (Ti/Fe/Pt rolled-up microtubes) in an aqueous solution of hydrogen peroxide. Unidirectional movement is achieved by periodic ejection of gas bubbles from one end, whereas formation of multiple bubbles hinders microjet movement in overloaded regime. The influence of nucleation positions of bubbles, hydrogen peroxide concentration, liquid-platinum contact angle, microjet length, and cone angle on the bubble ejection frequency and microjet speed are investigated. We find agreement between the theoretical speeds of the microjet for a range of bubble nucleation positions (0.4L ≤ x0 ≤ 0.6L) and our measurements (108 ± 35 μm/s) for unidirectional motion. In addition, we observe experimentally that transition to overloaded motion occurs for hydrogen peroxide concentration of 5%, whereas our model predicts this transition for concentrations above 2.5%.
AB - A numerical time-resolved model is presented for predicting the transition between unidirectional and overloaded motion of catalytic tubular microjets (Ti/Fe/Pt rolled-up microtubes) in an aqueous solution of hydrogen peroxide. Unidirectional movement is achieved by periodic ejection of gas bubbles from one end, whereas formation of multiple bubbles hinders microjet movement in overloaded regime. The influence of nucleation positions of bubbles, hydrogen peroxide concentration, liquid-platinum contact angle, microjet length, and cone angle on the bubble ejection frequency and microjet speed are investigated. We find agreement between the theoretical speeds of the microjet for a range of bubble nucleation positions (0.4L ≤ x0 ≤ 0.6L) and our measurements (108 ± 35 μm/s) for unidirectional motion. In addition, we observe experimentally that transition to overloaded motion occurs for hydrogen peroxide concentration of 5%, whereas our model predicts this transition for concentrations above 2.5%.
U2 - 10.1021/acs.jpcc.7b02447
DO - 10.1021/acs.jpcc.7b02447
M3 - Article
VL - 121
SP - 14854
EP - 14863
JO - Journal of physical chemistry C
JF - Journal of physical chemistry C
SN - 1932-7447
IS - 27
ER -