Effects of the net charge on abundance and stability of supramolecular surfactant aggregates in gas phase

Vincenzo Turco Liveri, Leopoldo Ceraulo, Angela Monia Ruggirello, Serena Indelicato, Mirella Ferrugia, David Bongiorno, Serena Indelicato, Mirella Ferrugia, David Bongiorno, Angela Ruggirello, Vincenzo Turco Liveri, Leopoldo Ceraulo, Gianluca Giorgi

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Self-assembling of amphiphilic molecules under electrospray ionization (ESI) conditions is characterized by quite unexpected phenomenology. The noticeable differences with respect to the condensed phase are attributable to the absence of the surfactant-solvent interactions, the presence of net charge in the aggregates, and the strong deviation from equilibrium conditions. Aiming to investigate the effects of the net charge on abundance and stability of supramolecular surfactant aggregates, positively and negatively charged aggregates of sodium bis(2-ethylhexyl)sulfosuccinate (AOT) and sodium methane sulfonate (MetS), butane sulfonate (ButS) and octane sulfonate (OctS) have been studied by ESI mass spectrometry, energy resolved mass spectrometry and density functional theory calculations. The negatively charged aggregates are found to be less stable than their positive counterparts. The results are consistent with a self-assembling pattern dominated by electrostatic interactions involving the counterions and head groups of the investigated amphiphilic compounds while the alkyl chains point outwards, protecting the aggregates from unlimited growth processes.
Original languageEnglish
Pages (from-to)195-201
Number of pages7
JournalJournal of Mass Spectrometry
Volume46
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Spectroscopy

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