Fluorescence Study of Premicellar Aggregation in Cationic Gemini Surfactants

Mathias, Joann H.; and, Milton J. Rosen; Davenport, Lesley

doi:10.1021/la010852s

Cited by 134 publications

(104 citation statements)

References 41 publications

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“…This shift was also accompanied by an abrupt decrease in the fluorescence intensity (data not shown) resulting from the bromide counterions condensation at the micelle surface as that observed for the ANS probe. The presence of preaggregates in submicellar concentrations of dimeric surfactants has been suggested by Mathias et al in a recent work using time resolved fluorescence spectroscopy [23], and thereafter their method was contested by Zana [24,25].…”

Section: Pca Fluorescence Steady-state Experimentsmentioning

confidence: 99%

A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)

B.S.

Tiera

2007

Eclet. Quím.

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Abstract:Two series of alkanediyl-a,w-bis (dimethylalkylammonium bromide (n-2-n and n-6-n; n=8, 10,12, and 16) have been synthesized and their micelles properties studied in aqueous solution using pyrene, pyrenecarboxaldehyde (PCA) and 1,8 anilinonaphtalene sulfonic acid sodium salt (ANS) as fluorescent probes. The micelles from these surfactants have been characterized on the basis of the information provided by micelle-solubilized fluorescent probes. The obtained results indicated that the surfactant concentration at which a marked decrease in l max parameter of pyrenecarboxaldehyde (PCA) occurs corresponds to the CMC determined by conductimetric measurements. Changes in the emission spectra of ANS and PCA observed in the submicellar range for both surfactants series (n-2-n and n-6-n) were interpreted as formation of pre-aggregates. It was found that the dimeric surfactants with long spacer (s= 6) form more hydrated aggregates when compared with those formed by the n-2-n and C n TAB surfactants series. This was attributed to a more difficult packing of n-6-n surfactant molecules to form micelles.

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Section: Pca Fluorescence Steady-state Experimentsmentioning

confidence: 99%

A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)

B.S.

Tiera

2007

Eclet. Quím.

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“…They have two hydrophobic chains and two hydrophilic head groups in the molecule. The gemini surfactants are the subject of more studies, because of the extraordinary surface activity (3,9,13,14,19,20).For several years, Tsubone and coworkers have studied the anionic gemini surfactant (CH 2 ) 2 [N(COC 11 H 23 )-CH 2 CH 2 (CO 2 Na)] 2 (compound 212), having N,N-dialkylamide and carboxylate groups, a dimer corresponding to SDMA, its homologs,. An interesting finding for the anionic gemini surfactants is that they show little or no break in their specific conductance vs. surfactant concentration plots.…”

mentioning

confidence: 99%

Micelle ionization degree of anionic gemini surfactant having N,N‐dialkylamide and carboxylate groups

Tsubone¹,

Ghosh

2003

J Surfact & Detergents

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The critical micelle concentration (cmc) behavior in aqueous NaCl solutions of the anionic gemini surfactant N, N'-ethylenebis(sodium N-dodecanoyl-β-alanate), (CH 2 ) 2 [N-(COC 11 H 23 )CH 2 CH 2 (CO 2 Na)] 2 (212), having N,N-dialkylamide and carboxylate groups in a molecule was investigated to measure the value of micelle ionization degree (α). For comparison, the behavior of sodium N-dodecanoyl-N-methyl-β-alanate (SDMA), a monomer corresponding to 212, also was investigated. The α value obtained from the Corrins-Harkins plot for 212 is 0.97 when [Na + ] ≤ 0.025 M and the value for SDMA is 0.51 when [Na + ] ≤ 0.1 M. That the α for 212 is larger than that for SDMA reflects the higher pK a1 value for 212 than the pK a value of SDMA. For 212, when [Na + ] ≤ 0.025 M the amount of Na + released during micellization is so large that the Na + concentration above the cmc is almost equal to that below the cmc, and therefore 212 nearly behaves as a nonionic surfactant.Paper no. S1330 in JSD 6, 225-229 (July 2003).KEY WORDS: Anionic gemini surfactant, Corrin-Harkins plot, degree of counter-ion binding, micelle ionization degree.Unusual interfacial behaviors are shown by two anionic surfactants, sodium N-dodecanoyl-N-methyl-β-alanate (SDMA) and sodium N-dodecanoylsarcosinate (SDSA), having N,Ndialkylamide and carboxylate groups, in comparison with those of sodium N-dodecanoyl-N-methyltaurate (SDMT), having a sulfonate group instead of a carboxylate group, and sodium decyloxyacetate (SDOA), containing an ether oxygen instead of an N-methyl adjacent to the methylenecarboxylate group (1). The unusual behaviors were found to be due to the simultaneous presence of the N,Ndialkylamide and carboxylate groups in the same molecule. Namely, the increasing order of conductance/surface tension critical micelle concentration (cmc) ratios is SDOA < SDMT < SDSA < SDMA. This order is the same as those of the parameters, A min (the minimum area occupied by the surfactant molecule at the air/water interface) and cmc/C 20 ratio (a measure of the factors inhibiting micellization relative to adsorption at the air/water interface), implying that there is a steric factor inhibiting micellization for the compounds having N,N-dialkylamide and carboxylate groups. The same order of increase in pH with surfactant concentration in the vicinity of the cmc appears to indicate H-bonded interaction between amide and protonated carboxylate groups. Thus, anionic surfactants having N,N-dialkylamide and carboxylate groups release Na + in micellization.In the past decade, a new type of surfactant called gemini surfactants has attracted considerable interest (2-19), since these compounds have much smaller cmc values and much greater efficiency in reducing surface tension than expected. They have two hydrophobic chains and two hydrophilic head groups in the molecule. The gemini surfactants are the subject of more studies, because of the extraordinary surface activity (3,9,13,14,19,20).For several years, Tsubone and coworkers have studied the anionic gemini surfa...

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“…It has been demonstrated that the properties of these new surfactants are superior to those of conventional surfactants, and include better solubility in water, better effect in lowering the surface tension of water, more efficient in forming micelles, etc. [8,9]. In order to further improve the solubility and inhibition performance of imidazolines, imidazoline-based dissymmetric bis-quaternary ammonium salt (DBA) has been successfully synthesized in our laboratory and has already been applied to inhibit the corrosion of Q235 steel in hydrochloric acid [10].…”

Section: Introductionmentioning

confidence: 99%

The synergistic inhibition effect between imidazoline-based dissymmetric bis-quaternary ammonium salts and thiourea on Q235 steel in CO2 corrosion process

Ren

Zhang

et al. 2015

Res Chem Intermed

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The inhibition effect of imidazoline-based dissymmetric bis-quaternary ammonium salt (DBA) and Thiourea (TU) on Q235 steel in CO 2 -saturated simulated oilfield-produced water was studied by means of the weight-loss method, polarization and electrochemical impedance spectroscopy (EIS). The polarization measurements reveal that the compound inhibitors are anodic-type inhibitors that mainly inhibit the anodic process. EIS results show that the changes in the impedance parameters are due to the formation of a protective layer on the Q235 steel surface by the adsorption of inhibitor molecules. The results of energy dispersive X-ray spectroscopy and scanning electron microscopy confirm the existence of the protective layer. The results also show that adsorption model obeys to the FloryHuggins adsorption isotherm. The synergism parameter suggests that the synergistic effect is obvious at concentrations of 100 and 200 mg L -1 , and there is a cooperative mechanism between the DBA and TU.

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Fluorescence Study of Premicellar Aggregation in Cationic Gemini Surfactants

Cited by 134 publications

References 41 publications

A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)

A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)

Micelle ionization degree of anionic gemini surfactant having N,N‐dialkylamide and carboxylate groups

The synergistic inhibition effect between imidazoline-based dissymmetric bis-quaternary ammonium salts and thiourea on Q235 steel in CO2 corrosion process

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