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SUMMARY:IMX Colloquium - Does H2O transmute to H2O2 or HO• + H• at the
  Air–Water Interface of Microscale Droplets / Bubbles?
DTSTART:20261026T131500
DTEND:20261026T141500
DTSTAMP:20261006T055111Z
UID:daadc2021e477061d18ae2d79e0c91715928a4088bbbf6abed3c263c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Himanshu Mishra\, King Abdullah University of Science 
 and Technology (KAUST)\, Saudi Arabia\nRecent reports claim that hydrogen 
 peroxide (H2O2) is spontaneously generated – without external energy inp
 ut or catalyst – at the air–water interface of microdroplets1\, bubble
 s2\, and soap films3. Several mechanisms have been proposed to explain thi
 s phenomenon\, including: (i) ultrahigh instantaneous electric fields at t
 he air–water interface driving HO− à HO• + e− radicals from hydro
 xide ions\; (ii) water’s comproportionation into H2O•+ and H2O•−\;
  and (iii) partial dehydration of interfacial H+ and HO− followed by rad
 ical formation. In contrast\, our laboratory experiments reveal that H2O2 
 formation is due to the reduction of dissolved O2 at water– solid interf
 aces\, i.e.\, with no role for the air–water interface beyond O2 mass tr
 ansport4-6. Based on these findings\, I will present four diagnostic crite
 ria against which any existing or future mechanistic proposal should be as
 sessed. Our approach reconciles the claims of spontaneous H2O2 formation w
 ithin established physical chemistry and extends naturally to other claims
  of anomalous microdroplet reactivity. \n\nReferences:\n(1) Mehrgardi\, M
 . A.\; Mofidfar\, M.\; Zare\, R. N. Sprayed Water Microdroplets Are Able t
 o Generate Hydrogen Peroxide Spontaneously. Journal of the American Chemic
 al Society 2022\, 144 (17)\, 7606-7609. DOI: 10.1021/jacs.2c02890.\n(2) Na
 mi-Ana\, S. F.\; Mehrgardi\, M. A.\; Mofidfar\, M.\; Zare\, R. N. Sustaine
 d Regeneration of Hydrogen Peroxide at the Water-Gas Interface of Electrog
 enerated Microbubbles on an Electrode Surface. Journal of the American Che
 mical Society 2024\, 146 (46)\, 31945-31949. DOI: 10.1021/jacs.4c11422 Fro
 m NLM PubMed-not-MEDLINE.\n(3) Eldeeb\, A. M.\; Berbille\, A.\; Dick\, J. 
 E. No Microdroplets? No Problem. Soap Films Amplify the Interface and Prod
 uce Hydrogen Peroxide. Journal of the American Chemical Society 2025\, 147
  (37)\, 33325-33329. DOI: 10.1021/jacs.5c05887.\n(4) Eatoo\, M. A.\; Mishr
 a\, H. Busting the myth of spontaneous formation of H2O2 at the air-water 
 interface: contributions of the liquid-solid interface and dissolved oxyge
 n exposed. Chemical Science 2024\, 15 (9)\, 3093-3103. DOI: 10.1039/d3sc06
 534k From NLM PubMed-not-MEDLINE.\n(5) Eatoo\, M. A.\; Wehbe\, N.\; Kharba
 tia\, N.\; Guo\, X.\; Mishra\, H. Why do some metal ions spontaneously for
 m nanoparticles in water microdroplets? Disentangling the contributions of
  the air-water interface and bulk redox chemistry. Chemical Science 2025\,
  16 (3)\, 1115-1125. DOI: 10.1039/d4sc03217a From NLM PubMed-not-MEDLINE.\
 n(6) Eatoo\, M. A.\; Mishra\, H. Disentangling the Roles of Dissolved Oxyg
 en\, Common Salts\, and pH on Spontaneous Hydrogen Peroxide Production in 
 Water: No O2\, No H2O2. Journal of the American Chemical Society 2025\, 14
 7 (39)\, 35392-35400. DOI: 10.1021/jacs.5c09028.\n\nPapers:\n- Busting th
 e myth of spontaneous formation of H2O2 at the air–water interface: cont
 ributions of the liquid–solid interface and dissolved oxygen exposed \n
 - Disentangling the Roles of Dissolved Oxygen\, Common Salts\, and pH on 
 Spontaneous Hydrogen Peroxide Production in Water: No O2\, No H2O2\n\nBio:
  Himanshu Mishra is a scientist-entrepreneur from King Abdullah Universit
 y of Science and Technology (KAUST)\, Saudi Arabia. His team has significa
 ntly contributed to resolving scientific debates surrounding the spontaneo
 us H2O2 formation in water microdroplets\, the electrification at water-hy
 drophobe interfaces\, and liquid–solid adhesion forces. Mishra’s team 
 has also pioneered Carbosoil™ technology to transform desert soils for s
 ustainable greening\, food production\, and carbon sequestration. His star
 t-up Terraxy is now scaling up Carbosoil™ production to advance sustaina
 bility projects in the Middle East and beyond. Mishra’s efforts have bee
 n featured by the World Economic Forum\, Geneva Inventions\, and CNN (LINK
 ).\n 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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