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Parameters Optimization of Catalytic Tubular Nanomembrane-Based Oxygen Microbubble Generator

1
State Key Laboratory for Modification of Chemical Fibers and Polymer Material Science and Engineering, Donghua University, Shanghai 201620, China
2
Department of Materials Science, Fudan University, Shanghai 200433, China
3
College of Science, Donghua University, Shanghai 201620, China
4
Department of Electronic and Engineering, Fudan University, Shanghai 200433, China
*
Authors to whom correspondence should be addressed.
Micromachines 2020, 11(7), 643; https://doi.org/10.3390/mi11070643
Received: 18 May 2020 / Revised: 16 June 2020 / Accepted: 22 June 2020 / Published: 29 June 2020
A controllable generation of oxygen gas during the decomposition of hydrogen peroxide by the microreactors made of tubular catalytic nanomembranes has recently attracted considerable attention. Catalytic microtubes play simultaneous roles of the oxygen bubble producing microreactors and oxygen bubble-driven micropumps. An autonomous pumping of peroxide fuel takes place through the microtubes by the recoiling microbubbles. Due to optimal reaction–diffusion processes, gas supersaturation, leading to favorable bubble nucleation conditions, strain-engineered catalytic microtubes with longer length produce oxygen microbubbles at concentrations of hydrogen peroxide in approximately ×1000 lower in comparison to shorter tubes. Dynamic regimes of tubular nanomembrane-based oxygen microbubble generators reveal that this depends on microtubes’ aspect ratio, hydrogen peroxide fuel concentration and fuel compositions. Different dynamic regimes exist, which produce specific bubble frequencies, bubble size and various amounts of oxygen. In this study, the rolled-up Ti/Cr/Pd microtubes integrated on silicon substrate are used to study oxygen evolution in different concentrations of hydrogen peroxide and surfactants. Addition of Sodium dodecyl sulfate (SDS) surfactants leads to a decrease of bubble diameter and an increase of frequencies of bubble recoil. Moreover, an increase of temperature (from 10 to 35 °C) leads to higher frequencies of oxygen bubbles and larger total volumes of produced oxygen. View Full-Text
Keywords: oxygen; hydrogen peroxide; microreactor; catalytic; nanomembrane; microtube; bubble oxygen; hydrogen peroxide; microreactor; catalytic; nanomembrane; microtube; bubble
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MDPI and ACS Style

Naeem, S.; Naeem, F.; Zhang, J.; Mujtaba, J.; Xu, K.; Huang, G.; Solovev, A.A.; Mei, Y. Parameters Optimization of Catalytic Tubular Nanomembrane-Based Oxygen Microbubble Generator. Micromachines 2020, 11, 643.

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