Adsorption Properties of Novel Gemini Surfactants with Nonidentical Head Groups

Alami, E.; Holmberg, Krister; Eastoe, Julian

doi:10.1006/jcis.2001.8116

Cited by 59 publications

(45 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This allows for the development of environmental surfactants for a wide variety of industrial applications. Based on a similar strategy, Alami and co-workers have reported oleylnitrile-based nonionic heterogemini surfactants containing hydroxyl and polyoxyethylene headgroups 5 and oleylnitrile-based anionic heterogemini surfactants containing sulfate and polyoxyethylene headgroups 6 .…”

Section: Introductionmentioning

confidence: 99%

Sulfonic-Hydroxyl-Type Heterogemini Surfactants Synthesized from Unsaturated Fatty Acids

et al. 2010

View full text Add to dashboard Cite

Novel anionic heterogemini surfactants have been synthesized from two kinds of unsaturated fatty acids (oleic acid and petroselinic acid). The hydrocarbon chain is covalently bound to the terminal carbonyl group of the unsaturated fatty acids and hydrophilic headgroups (i.e., sulfonic and hydroxyl groups) are introduced to the cis double bond. The aqueous solution properties of the surfactants synthesized here have been studied on the basis of static/dynamic surface tension, conductivity, fl uorescence, and dynamic light scattering (DLS) data. We have mainly focused on the following two factors that may signifi cantly impact the aqueous solution properties of the surfactants: one is hydrocarbon chain length and the other is molecular symmetry. The fi rst key result from our current study is that increased hydrocarbon chain length results in a closely packed monolayer fi lm at the air/aqueous solution interface, even at low concentrations as a result of the increased hydrophobicity of the longer chain analogue. We have previously observed a similar trend when aqueous solution properties of oleic acid-based phosphate-type heterogemini surfactants were studied. The second key fi nding of our current research is that increased molecular symmetry results in greater surface activities (which include lower aqueous surface tension and greater molecular packing at the air/aqueous solution interface). In addition, it seems likely that the size of molecular assemblies spontaneously formed in bulk solution decreases when the molecular symmetry increases. These results suggest that the symmetric analogue provides greater hydrophobic environments, although the exact reason for this is not yet known.

show abstract

Section: Introductionmentioning

confidence: 99%

Sulfonic-Hydroxyl-Type Heterogemini Surfactants Synthesized from Unsaturated Fatty Acids

et al. 2010

View full text Add to dashboard Cite

show abstract

“…However, new classes of gemini surfactants have emerged and have attractive attention: dissymmetric gemini surfactants with hydrocarbon chains of different length and with two identical head groups [21][22][23][24][25][26][27][28] and asymmetric ones with two identical hydrocarbon chains and two different hydrophilic head groups [29][30][31][32][33][34]. The research on asymmetric gemini surfactant was less documented.…”

Section: Introductionmentioning

confidence: 99%

“…The research on asymmetric gemini surfactant was less documented. To our knowledge, Holmberg team [30][31][32][33][34][35] pioneered research on the properties of asymmetric gemini surfactant in solutions. They mainly studied the surface properties and adsorption characters of zwitterionic gemini surfactant at the air-water and solid-water interfaces.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and aqueous solution properties of homologous gemini surfactants with different head groups

et al. 2007

View full text Add to dashboard Cite

A series of homologous gemini surfactants possessing identical hydrophobic chains but different ionic head groups (cationic, anionic, zwitterionic) were synthesized, and their aqueous solution properties were examined. The results showed that the surface activities of gemini surfactants are superior to those of corresponding conventional monomeric surfactants, and molecular arrangements of gemini surfactants at the air-water interface are tighter than those of corresponding conventional surfactants. It was also found that zwitterionic gemini surfactant possesses the highest surface activity among the three surfactants. The behavior at the air-water interface is closely related to the molecular structural features of surfactants, which provide an indication for synthesizing highly-efficient surfactants.

show abstract

“…Most concern in the studies on mixed surfactant systems is paid to synergism or blending effects in surfactant mixtures (1)(2)(3)(4)(5)(6)(7)(8)(9). As the mixing of different species of surfactants, needless to say, has a possibility to result in more useful performance caused by synergism, early representative studies on mixed surfactants have been introduced by a few useful monographs (10)(11)(12) and by books composed of systematically collected papers (13,14).…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Micelle Formation of Mixed Surfactant Systems in Water. III. A Comparison between Cationic Gemini / Cationic and Cationic Gemini / Nonionic Combinations

et al. 2003

View full text Add to dashboard Cite

A surface tension study (drop volume method) was performed at 30 on micellization and adsorbed film formation of a mixed system of a cationic Gemini-type surfactant with a cationic surfactant in comparison with another mixed system of the same Gemini-type surfactant with a nonionic surfactant. The systems studied were Bis-ammonium Gemini derived from tartaric acid dibromide salt [BAGTB, 1,4-Bis(trimethylammonio)-2,3-dodecyloxy butane dibromide] with hexadecyltrimethylammonium bromide (HTAB): BAGTB / HTAB mixed system and with n-decanoyl-N-methylglucamide (MEGA-10): BAGTB/MEGA-10 mixed system. The data of surface tension (g ) vs logarithmic molality plots as a function of mole fraction of surfactant 2 (2 corresponds to HTAB or MEGA-10), X 2 , enabled us to determine the critical micellization concentration (CMC), the surface tension at CMC (g CMC ), surface excess concentration (G t ), the mean molecular surface area (A m ), the partial molecular area (PMA), and the measures of efficiency of adsorption (pC 20 = log C 20 ) and CMC/C 20 which is available for evaluating the facilitating balance between adsorption and micellization. In addition, a newly defined measure of synergism in surface activity, i. e., the minimum surface Gibbs energy (G ) was employed. Based on these data, the examination of synergism in micelle formation and in surface tension reduction elucidated that the Gemini-type surfactant does not exhibit any positive synergism for either BAGTB / HTAB or BAGTB / MEGA-10 mixed systems. Most of these parameters are found to depend conspicuously on the mixing ratio for both mixtures; indicating that the state of adsorbed film is divided into three ranges of X 2 ; the lower, the middle and the higher. The compositions of micelles formed at CMC (Y 2 ) and of adsorbed film (Z 2 ) equilibinated with bulk solution at a fixed surface tension were estimated.

show abstract

Adsorption Properties of Novel Gemini Surfactants with Nonidentical Head Groups

Cited by 59 publications

References 32 publications

Sulfonic-Hydroxyl-Type Heterogemini Surfactants Synthesized from Unsaturated Fatty Acids

Sulfonic-Hydroxyl-Type Heterogemini Surfactants Synthesized from Unsaturated Fatty Acids

Synthesis and aqueous solution properties of homologous gemini surfactants with different head groups

Adsorption and Micelle Formation of Mixed Surfactant Systems in Water. III. A Comparison between Cationic Gemini / Cationic and Cationic Gemini / Nonionic Combinations

Contact Info

Product

Resources

About