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• Verdel, N
• Jerman, I
• Krasovec, R
• Bukovec, P
• Zupancic, M
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• Verdel, N
• Jerman, I
• Krasovec, R
• Bukovec, P
• Zupancic, M
• [+] on PubMed
• Verdel, N
• Jerman, I
• Krasovec, R
• Bukovec, P
• Zupancic, M

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Int. J. Mol. Sci. 2012, 13(4), 4048-4068; doi:10.3390/ijms13044048

Article

Possible Time-Dependent Effect of Ions and Hydrophilic Surfaces on the Electrical Conductivity of Aqueous Solutions

Nada Verdel ^1,* , Igor Jerman ¹ , Rok Krasovec ¹ , Peter Bukovec ²  and Marija Zupancic ²

¹ Institute Bion d. o. o., Stegne 21, 1000 Ljubljana, Slovenia ² Department of Chemistry, University of Ljubljana, Aškerčeva 5, 1000 Ljubljana, Slovenia

* Author to whom correspondence should be addressed.

Received: 21 January 2012; in revised form: 28 February 2012 / Accepted: 13 March 2012 / Published: 27 March 2012

(This article belongs to the Section Physical Chemistry, Theoretical and Computational Chemistry)

Download PDF Full-Text [541 KB, Updated Version, uploaded 30 March 2012 08:36 CEST]

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Abstract: The purpose of this work was to determine the influence of mechanical and electrical treatment on the electrical conductivity of aqueous solutions. Solutions were treated mechanically by iteration of two steps: 1:100 dilution and vigorous shaking. These two processes were repeated until extremely dilute solutions were obtained. For electrical treatment the solutions were exposed to strong electrical impulses. Effects of mechanical (as well as electrical) treatment could not be demonstrated using electrical conductivity measurements. However, significantly higher conductivity than those of the freshly prepared chemically analogous solutions was found in all aged solutions except for those samples stored frozen. The results surprisingly resemble a previously observed weak gel-like behavior in water stored in closed flasks. We suggest that ions and contact with hydrophilic glass surfaces could be the determinative conditions for the occurrence of this phenomenon.

Keywords: autothixotropy; conductivity; exclusion zone; extremely dilute solutions; water

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