Thermodynamics of non-ionic surfactant Triton X-100-cationic surfactants mixtures at the cloud point
Küçük Resim Yok
Tarih
2011
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Academic Press Ltd- Elsevier Science Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
This study investigates the effects of gemini and conventional cationic surfactants on the cloud point (CP) of the non-ionic surfactant Triton X-100 (TX-100) in aqueous solutions. Instead of visual observation, a spectrophotometer was used for measurement of the cloud point temperatures. The thermodynamic parameters of these mixtures were calculated at different cationic surfactant concentrations. The gemini surfactants of the alkanediyl-alpha-omega-bis (alkyldimethylammonium) dibromide type, on the one hand, with different alkyl groups containing m carbon atoms and an ethanediyl spacer, referred to as m-2-m (m = 10, 12, and 16) and, on the other hand, with -C-16 alkyl groups and different spacers containing s carbon atoms, referred to as 16-s-16 (s = 6 and 10) were synthesized, purified and characterized. Additions of the cationic surfactants to the TX-100 solution increased the cloud point temperature of the TX-100 solution. It was accepted that the solubility of non-ionic surfactant containing polyoxyethylene (POE) hydrophilic chain was a maximum at the cloud point so that the thermodynamic parameters were calculated at this temperature. The results showed that the standard Gibbs free energy (Delta G(cp)(o)), the enthalpy (Delta H-cp(o)) and the entropy (Delta S-cp(o)) of the clouding phenomenon were found positive in all cases. The standard free energy (Delta G(cp)(o)) increased with increasing hydrophobic alkyl chain for both gemini and conventional cationic surfactants; however, it decreased with increasing surfactant concentration. (C) 2011 Elsevier Ltd. All rights reserved.
Açıklama
Anahtar Kelimeler
Cloud Point, Gemini Surfactant, Triton X-100, Thermodynamic Parameter, Gemini Surfactants, Anionic Surfactants, Organic Additives, Amphiphilic Drug, Behavior, Electrolytes, Micelles, Length
Kaynak
Journal Of Chemical Thermodynamics
WoS Q Değeri
Q1
Scopus Q Değeri
Q2
Cilt
43
Sayı
12
