Possible time-dependent effect of ions and hydrophilic surfaces on the electrical conductivity of aqueous solutions

Verdel, Nada (author), Jerman, Igor (author), Krašovec, Rok (author), Bukovec, Peter (author), Zupančič, Marija (author)

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.

• Language: English
• Keywords: autothixotropy, conductivity, exclusion zone, extremely dilute solutions, water
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Publication status: Published
• Publication version: Version of Record
• Year: 2012
• Number of pages: Str. 4048-4068
• Numbering: Vol. 13, iss. 4
• PID: 20.500.12556/RUL-129519
• UDC: 546.212:544.35:544.022.822
• ISSN on article: 1661-6596
• DOI: 10.3390/ijms13044048
• COBISS.SI-ID: 35901957
• Publication date in RUL: 03.09.2021

Record is a part of a journal

• Title: International journal of molecular sciences
• Shortened title: Int. j. mol. sci.
• Publisher: MDPI
• ISSN: 1661-6596
• COBISS.SI-ID: 36217605

Licences

• License: CC BY 3.0, Creative Commons Attribution 3.0 Unported
• Link: https://creativecommons.org/licenses/by/3.0/deed.en
• Description: You are free to reproduce and redistribute the material in any medium or format. You are free to remix, transform, and build upon the material for any purpose, even commercially. You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
• Licensing start date: 01.04.2012

Secondary language

• Language: Slovenian
• Keywords: anorganska kemija, fizikalna kemija, molekule, voda, struktura, vodne raztopine, tekočine, električna prevodnost, hidrofobnost, hidrofobne površine, avtotiksotropija, zelo razredčene raztopine, šibki geli, ioni

Projects

• Funder: EC - European Commission
• Funding programme: European Social Fund