Modeling of Unidirectional-Overloaded Transition in Catalytic Tubular Microjets

Anke Klingner, Islam S. M. Khalil, Veronika Magdanz, Vladimir M. Fomin, Oliver G. Schmidt, Sarthak Misra

    Research output: Contribution to journalArticleAcademicpeer-review

    6 Citations (Scopus)

    Abstract

    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%.
    Original languageEnglish
    Pages (from-to)14854-14863
    Number of pages10
    JournalJournal of physical chemistry C
    Volume121
    Issue number27
    DOIs
    Publication statusPublished - 13 Jul 2017

    Fingerprint

    Hydrogen peroxide
    Hydrogen Peroxide
    bubbles
    hydrogen peroxide
    Nucleation
    ejection
    Platinum
    Bubbles (in fluids)
    Contact angle
    Cones
    nucleation
    Gases
    Liquids
    cones
    platinum
    aqueous solutions
    liquids
    gases

    Cite this

    Klingner, Anke ; Khalil, Islam S. M. ; Magdanz, Veronika ; Fomin, Vladimir M. ; Schmidt, Oliver G. ; Misra, Sarthak. / Modeling of Unidirectional-Overloaded Transition in Catalytic Tubular Microjets. In: Journal of physical chemistry C. 2017 ; Vol. 121, No. 27. pp. 14854-14863.
    @article{634ba1b40fe64976a624ff74f75f2dc5,
    title = "Modeling of Unidirectional-Overloaded Transition in Catalytic Tubular Microjets",
    abstract = "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{\%}.",
    author = "Anke Klingner and Khalil, {Islam S. M.} and Veronika Magdanz and Fomin, {Vladimir M.} and Schmidt, {Oliver G.} and Sarthak Misra",
    year = "2017",
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    day = "13",
    doi = "10.1021/acs.jpcc.7b02447",
    language = "English",
    volume = "121",
    pages = "14854--14863",
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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 journalArticleAcademicpeer-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

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    SP - 14854

    EP - 14863

    JO - Journal of physical chemistry C

    JF - Journal of physical chemistry C

    SN - 1932-7447

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    ER -