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Synthesis and Properties of Gemini Surfactants

Fa Cheng

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Abstract

A series of sulfonic-acid type Gemini surfactants were synthesized from 1,2-diphenylethane and long-chain aliphatic acyl chloride.Products obtained were characterized by 1H NMR and FT-IR;surface tension curve and related parameters were acquired by surface tension measurements.Results showed that the critical micelle concentra-tion(CMC) decreased with the increasing hydrophobic chain length.Compared with the corresponding linear sodium dodecy1 benzene sulfonate(SDBS),the C20 and CMC of Gemini surfactant G12-2-12 decreased by 94.4% and 91.3%,respectively.The area occupied by the surfactant molecule at the air/water interface(Amin)of G12-2-12 was 27%,less than two times that of SDBS,which suggested that Gemini surfactants packed more closely.

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What this paper is about

A series of sulfonic-acid type Gemini surfactants were synthesized from 1,2-diphenylethane and long-chain aliphatic acyl chloride.Products obtained were characterized by 1H NMR and FT-IR;surface tension curve and related parameters were acquired by surface tension measurements.Results showed that the critical micelle concentra-tion(CMC) decreased with the increasing hydrophobic chain length.Compared with the corresponding linear sodium dodecy1 benzene sulfonate(SDBS),the C20 and CMC of Gemini surfactant G12-2-12 decreased by 94.4% and 91.3%,respectively.The area occupied by the surfactant molecule at the air/water interface(Amin)of G12-2-12 was 27%,less than two times that of SDBS,which suggested that Gemini surfactants packed more closely.

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Available abstract

A series of sulfonic-acid type Gemini surfactants were synthesized from 1,2-diphenylethane and long-chain aliphatic acyl chloride.Products obtained were characterized by 1H NMR and FT-IR;surface tension curve and related parameters were acquired by surface tension measurements.Results showed that the critical micelle concentra-tion(CMC) decreased with the increasing hydrophobic chain length.Compared with the corresponding linear sodium dodecy1 benzene sulfonate(SDBS),the C20 and CMC of Gemini surfactant G12-2-12 decreased by 94.4% and 91.3%,respectively.The area occupied by the surfactant molecule at the air/water interface(Amin)of G12-2-12 was 27%,less than two times that of SDBS,which suggested that Gemini surfactants packed more closely.

Key concepts: Pulmonary surfactant, Surface tension, Critical micelle concentration, Chemistry, Sulfonate, Benzene, Sodium, Sulfonic acid

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