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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, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry. 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 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 9, no 23, p. 6739-6743Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 9, no 23, p. 6739-6743
National Category
Chemical Sciences
Identifiers
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
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research EU, European Research Council, 616305
Note

QC 20190108

Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08Bibliographically approved

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Tyrode, Eric

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