TY - JOUR
T1 - Effects of the net charge on abundance and stability of supramolecular surfactant aggregates in gas phase
AU - Ferrugia, Mirella
AU - Ruggirello, Angela Monia
AU - Bongiorno, David
AU - Indelicato, Serena
AU - Ceraulo, Leopoldo
AU - Turco Liveri, Vincenzo
AU - Indelicato, Serena
AU - Ferrugia, Mirella
AU - Bongiorno, David
AU - Ruggirello, Angela
AU - Liveri, Vincenzo Turco
AU - Ceraulo, Leopoldo
AU - Giorgi, Gianluca
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
KW - DFT calculations
KW - anhydrous reverse micelles
KW - electrospray ionization
KW - energy-resolved mass spectrometry
KW - self-assembling
KW - DFT calculations
KW - anhydrous reverse micelles
KW - electrospray ionization
KW - energy-resolved mass spectrometry
KW - self-assembling
UR - http://hdl.handle.net/10447/54569
M3 - Article
VL - 46
SP - 195
EP - 201
JO - Journal of Mass Spectrometry
JF - Journal of Mass Spectrometry
SN - 1076-5174
ER -