Surface Tension of Aqueous Solutions of Small-Chain Amino and Organic Acids

Mohsin Raza, Paul D Hallett, Xiangyang Liu, Maogang He, Waheed Afzal

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)
9 Downloads (Pure)


Surface tension was measured for aqueous solutions of DL-malic acid, L-glutamine, L-serine, L-proline, L-methionine, L-valine, and L-lactic acid as a function of concentration using a Du Noüy ring over a temperature range between 298 K and 328 K at 101 kPa atmospheric pressure. Surface tensions of several concentrations of each organic acid were measured to develop four isotherms with a temperature ramp of 10 K starting from 298 K. Cohesive forces between molecules were weakened by temperature rise, resulting in decreased surface tension. Mass concentration and temperature effects on surface tension were reflected by the slopes of the relationships between surface tension and either mass concentration or temperature, respectively. In this study L-serine and L-glutamine showed hydrophilic behaviour while Lproline, L-methionine, DL-malic acid, L-valine, and L-lactic acid had hydrophobic behaviour. For all acids studied here, increased temperature caused decreased surface tension of aqueous solutions of solute.
Original languageEnglish
Pages (from-to)5049-5056
Number of pages8
JournalJournal of Chemical and Engineering Data
Issue number12
Early online date23 Oct 2019
Publication statusPublished - 12 Dec 2019


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