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dc.contributor.authorMusskopf, Nayara H.
dc.contributor.authorGallo Junior, Adair
dc.contributor.authorZhang, Peng
dc.contributor.authorPetry, Jeferson
dc.contributor.authorMishra, Himanshu
dc.date.accessioned2021-11-22T08:43:15Z
dc.date.available2021-11-22T08:43:15Z
dc.date.issued2021-11-18
dc.date.submitted2021-09-07
dc.identifier.citationMusskopf, N. H., Gallo, A., Zhang, P., Petry, J., & Mishra, H. (2021). The Air–Water Interface of Water Microdroplets Formed by Ultrasonication or Condensation Does Not Produce H2O2. The Journal of Physical Chemistry Letters, 11422–11429. doi:10.1021/acs.jpclett.1c02953
dc.identifier.issn1948-7185
dc.identifier.issn1948-7185
dc.identifier.doi10.1021/acs.jpclett.1c02953
dc.identifier.urihttp://hdl.handle.net/10754/673715
dc.description.abstractRecent reports on the production of hydrogen peroxide (H2O2) on the surface of condensed water microdroplets without the addition of catalysts or additives have sparked significant interest. The underlying mechanism is thought to be ultrahigh electric fields at the air–water interface; smaller droplets present larger interfacial areas and produce higher (detectable) H2O2 yields. To gain insights into this phenomenon, we performed condensation experiments and quantified H2O2 formation as a function of the vapor source. Specifically, we compared the H2O2 concentration in water microdroplets condensed from the vapor realized via (i) heating water in the range of 50–70 °C and (ii) ultrasonic humidification (as exploited in the original report). Experimental results revealed that the H2O2 level inside water microdroplets condensed via heating water was below our detection limit (≥0.25 μM), regardless of the droplet size or the substrate wettability. In contrast, water droplets condensed via ultrasonic humidification contained significantly higher (∼1 μM) H2O2 concentrations. We conclude that the ultrasonic humidifiers contribute to H2O2 production, not droplet interfacial effects.
dc.description.sponsorshipThe authors acknowledge research funding from King Abdullah University of Science and Technology via Grant BAS/1/1070-01-01. The illustration for Figure 6 was created by Ivan Gromicho, Scientific Illustrator, Research Communication and Publication Services, Office of the Vice President for Research, King Abdullah University of Science and Technology.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acs.jpclett.1c02953
dc.rightsThis is an open access article.
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleThe Air–Water Interface of Water Microdroplets Formed by Ultrasonication or Condensation Does Not Produce H2O2
dc.typeArticle
dc.contributor.departmentBiological and Environmental Science and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentInterfacial Lab
dc.contributor.departmentInterfacial Lab (iLab), King Abdullah University of Science and Technology (KAUST), Biological and Environmental Science and Engineering (BESE) Division, Water Desalination and Reuse Center (WDRC), Thuwal 23955-6900, Saudi Arabia
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalThe Journal of Physical Chemistry Letters
dc.eprint.versionPublisher's Version/PDF
dc.identifier.pages11422-11429
kaust.personMusskopf, Nayara H.
kaust.personGallo Junior, Adair
kaust.personZhang, Peng
kaust.personPetry, Jeferson
kaust.personMishra, Himanshu
dc.date.accepted2021-11-01
refterms.dateFOA2021-11-22T10:29:52Z


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