Are the mixtures of homologous surfactants ideal?

Schulz, Pablo C.; Rodrı́guez, José Luis; Minardi, R. M.; Sierra, María Belén; Morini, Marcela A.

doi:10.1016/j.jcis.2006.07.012

Cited by 72 publications

(83 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is defined as the ratio of the difference between cmc id and cmc to cmc id (Dcmc/cmc id ). [18,19] found that the difference in tail lengths of the two components affects the process of micellization. In our systems the difference in tails of surfactants and drug is maximum in 8(-)-2-16(?)…”

Section: Resultsmentioning

confidence: 99%

Effect of Asymmetric Dimeric Zwitterionic Surfactants on Micellization Behavior of Amphiphilic Drugs

et al. 2015

View full text Add to dashboard Cite

The micellization process in mixtures of amphiphilic drugs and asymmetric dimeric zwitterionic surfactants have been investigated tensiometrically. The drugs used are from two families: imipramine hydrochloride (IMP)-a tricyclic antidepressant and ibuprofen (IBF)-a nonsteroidal antiinflammatory drug, whereas zwitterionic dimeric surfactants are heterogemini surfactants that contain quaternary ammonium and phosphate groups as heads. The results show that the cmc of drug-surfactant mixtures decreases with the increase in stoichiometric mole fraction of surfactants (a 1 ), suggesting attractive interaction among the two components. This is supported by the values of cmc id (critical micelle concentration values for ideal mixing) which are always greater than experimental cmc values. Also, the decrease in magnitude is more in IBF-dimeric surfactant mixed systems than in IMP-dimeric surfactant mixed systems. Micellar mole fraction values, obtained using Rubingh's (X m 1 ) and Motomura's (X m 1 ) models, are lower than the micellar mole fraction for ideal mixing (X id 1 ). The micellar interaction parameter (b m ) follows the order: 8(. The results are explained on the basis of difference in tail lengths. Interfacial mole fraction (X r 1 ) values, evaluated using Rosen's model, are higher than X m 1 values for IMP-10(-)-2-16(?) and IMP-10(-)-2-14(?) systems while for all other systems (except 8(-)-2-14(?)) the values are smaller than X m 1 . The interaction parameter at the interface (b r ) is negative and b m av values are greater than b r av in magnitude. All the results indicate that the dimeric surfactants are mostly in cationic form.

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of Asymmetric Dimeric Zwitterionic Surfactants on Micellization Behavior of Amphiphilic Drugs

et al. 2015

View full text Add to dashboard Cite

show abstract

“…This decreases the surface exposed to water and may produce stabilization in mixed micelles. Schulz et al [46] studied mixed micellization of two homologous surfactants having different tail lengths. They observed that larger the difference between the two tails, lower is the proportion of shorter chain surfactant in the mixed micelles.…”

Section: Micellar Behavior Of Gemini:pl Mixturesmentioning

confidence: 99%

Effect of surfactant structure on the mixed micelle formation of cationic gemini–zwitterionic phospholipid systems

Naqvi

Noori

Kabir-ud-Din

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

“…Several workers have analyzed CMC data by Motomura's equation [8] which does take into account electro-neutrality but not the activity of the surfactant aggregate ion. The results reported for mixtures of alkyltrimethylammonium bromides give positive or negative values of the interaction parameter or excess Gibbs energy [9][10][11][12]. It is also reported that the interaction between surfactants is attractive for other homologous surfactants [9,13].…”

Section: Introductionmentioning

confidence: 81%

Unusual behavior of CMC for binary mixtures of alkyltrimethylammonium bromides: Dependence on chain length difference

Akisada

Kuwahara

Koga

et al. 2007

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Are the mixtures of homologous surfactants ideal?

Cited by 72 publications

References 53 publications

Effect of Asymmetric Dimeric Zwitterionic Surfactants on Micellization Behavior of Amphiphilic Drugs

Effect of Asymmetric Dimeric Zwitterionic Surfactants on Micellization Behavior of Amphiphilic Drugs

Effect of surfactant structure on the mixed micelle formation of cationic gemini–zwitterionic phospholipid systems

Unusual behavior of CMC for binary mixtures of alkyltrimethylammonium bromides: Dependence on chain length difference

Contact Info

Product

Resources

About