TY - JOUR
T1 - Characterization of monomeric and gemini cationic amphiphilic molecules by fluorescence intensity and anisotropy
AU - Quagliotto, Pierluigi
AU - Barbero, Nadia
AU - Barolo, Claudia
AU - Costabello, Katiuscia
AU - Marchese, Leonardo
AU - Coluccia, Salvatore
AU - Kalyanasundaram, Kuppuswamy
AU - Viscardi, Guido
N1 - Funding Information:
This work was supported by a contribution of University of Torino (ex-60% funds), Regione Piemonte funds (Ricerca Scientifica Applicata 2004, project code A167 and Ricerca Scientifica Applicata 2005, project codes D14 and D67) and EU COST action D35/0007/05 (Molecular Engineering of Interfaces of Photonic Devices based on Mesoscopic Oxide Layers). PQ, GV, CB and NB thank Compagnia di San Paolo (Torino, Italy) and Fondazione della Cassa di Risparmio di Torino (Italy) for continuous supplying laboratory equipment. KK acknowledges financial support of this work by the Swiss Federal Office for Energy (OFEN).
PY - 2009/8
Y1 - 2009/8
N2 - Pyrene fluorescence intensity and conductivity measurements were used to determine the cmc of two monomeric surfactants namely, dodecyltrimethylammonium bromide and cetyltrimethylammonium bromide as well as two gemini surfactants, 16-3-16 2Br and 16-4-16 2Br of the alkanediyl-α,ω-bis(alkyldimethyl ammonium bromide) type. Cmc measurements were confirmed using fluorescence anisotropy measurements employing fluorescein as probe. Anisotropy-concentration plots showed sigmoidal behaviour and the obtained values for cmc were in good agreement with those determined using conductivity and pyrene fluorescence intensity. Also, the anisotropy of both fluorescein and another fluorescent probe, perylene, were used to provide information on the micellar structure.
AB - Pyrene fluorescence intensity and conductivity measurements were used to determine the cmc of two monomeric surfactants namely, dodecyltrimethylammonium bromide and cetyltrimethylammonium bromide as well as two gemini surfactants, 16-3-16 2Br and 16-4-16 2Br of the alkanediyl-α,ω-bis(alkyldimethyl ammonium bromide) type. Cmc measurements were confirmed using fluorescence anisotropy measurements employing fluorescein as probe. Anisotropy-concentration plots showed sigmoidal behaviour and the obtained values for cmc were in good agreement with those determined using conductivity and pyrene fluorescence intensity. Also, the anisotropy of both fluorescein and another fluorescent probe, perylene, were used to provide information on the micellar structure.
KW - Cmc
KW - Conductivity
KW - Fluorescein sodium salt
KW - Fluorescence anisotropy
KW - Gemini cationic surfactants
KW - Perylene
KW - Pyrene
UR - http://www.scopus.com/inward/record.url?scp=62749172819&partnerID=8YFLogxK
U2 - 10.1016/j.dyepig.2008.12.002
DO - 10.1016/j.dyepig.2008.12.002
M3 - Article
SN - 0143-7208
VL - 82
SP - 124
EP - 129
JO - Dyes and Pigments
JF - Dyes and Pigments
IS - 2
ER -