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Synthesis and monolayer film of a series of new twin-tailed gemini cationic surfactants at the air/water interface

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Chen Z., Feng Y., Zhou D., Zhu P., Wu D.

Open Chemistry

2008

vol. 6

issue 3

477-481

A series of new dimeric surfactants, twin-tailed gemini surfactants, 2(12)-s-2(12), were successfully prepared and characterized, and their monolayer films investigated by the measurement of surface pressure-area (π-A) and surface pressure-time (π-t) isotherms at the air/water interface by a Langmuir film balance. Compared to their monomeric counterparts, their collapse pressure (γcollapse) is smaller, whilst all the molecular area parameters are larger. The limited area (Alimited) and the initial area (Ainitial) of these twin-tailed gemini surfactants change with increasing spacer length s, and the surface pressure decreases with increasing time. It was also found that the higher the initial surface pressure, the larger the attenuation. [...]

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

100%

Sun Y., Feng Y., Dong H., Chen Z., Han L.

Open Chemistry

2007

vol. 5

issue 2

620-634

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. [...]

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2 Open Chemistry

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2 Chen Z.

2 Feng Y.

1 Dong H.

1 Han L.

1 Sun Y.

1 Wu D.

1 Zhou D.

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Synthesis and monolayer film of a series of new twin-tailed gemini cationic surfactants at the air/water interface

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