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The Jones-Ray Effect Is Not Caused by Surface-Active Impurities
Ecole Polytech Fed Lausanne, Inst Bioengn IBI, Sch Engn STI, Lab Fundamental BioPhoton LBP, CH-1015 Lausanne, Switzerland.;Ecole Polytech Fed Lausanne, Inst Mat Sci IMX, Sch Engn STI, CH-1015 Lausanne, Switzerland.;Ecole Polytech Fed Lausanne, Lausanne Ctr Ultrafast Sci LACUS, CH-1015 Lausanne, Switzerland..ORCID-id: 0000-0002-2492-1168
Penn State Univ, Dept Chem, University Pk, PA 16802 USA..ORCID-id: 0000-0002-9989-968X
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi. Ecole Polytech Fed Lausanne, Inst Bioengn IBI, Sch Engn STI, Lab Fundamental BioPhoton LBP, CH-1015 Lausanne, Switzerland.;Ecole Polytech Fed Lausanne, Inst Mat Sci IMX, Sch Engn STI, CH-1015 Lausanne, Switzerland.;Ecole Polytech Fed Lausanne, Lausanne Ctr Ultrafast Sci LACUS, CH-1015 Lausanne, Switzerland..
Penn State Univ, Dept Chem, University Pk, PA 16802 USA.;Penn State Univ, Biochem & Mol Biol, University Pk, PA 16802 USA..ORCID-id: 0000-0002-8524-0438
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2018 (Engelska)Ingår i: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 9, nr 23, s. 6739-6743Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Pure aqueous electrolyte solutions display a minimum in surface tension at concentrations of 2 +/- 1 mM. This effect has been a source of controversy since it was first reported by Jones and Ray in the 1930s. The Jones Ray effect has frequently been dismissed as an artifact linked to the presence of surface-active impurities. Herein we systematically consider the effect of surface-active impurities by purposely adding nanomolar concentrations of surfactants to dilute electrolyte solutions. Trace amounts of surfactant are indeed found to decrease the surface tension and influence the surface chemistry. However, surfactants can be removed by repeated aspiration and stirring cycles, which eventually deplete the surfactant from solution, creating a pristine surface. Upon following this cleaning procedure, a reduction in the surface tension by millimolar concentrations of salt is still observed. Consequently, we demonstrate that the Jones Ray effect is not caused by surface-active impurities.

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American Chemical Society (ACS), 2018. Vol. 9, nr 23, s. 6739-6743
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Kemi
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URN: urn:nbn:se:kth:diva-240730DOI: 10.1021/acs.jpclett.8b02957ISI: 000452929200011PubMedID: 30398354Scopus ID: 2-s2.0-85056707754OAI: oai:DiVA.org:kth-240730DiVA, id: diva2:1276612
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VetenskapsrådetStiftelsen för strategisk forskning (SSF)EU, Europeiska forskningsrådet, 616305
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QC 20190108

Tillgänglig från: 2019-01-08 Skapad: 2019-01-08 Senast uppdaterad: 2019-01-08Bibliografiskt granskad

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