Interfacial Dilational Rheology of the Novel Zwitterionic Surfactants
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Abstract
The dilational rheological properties of series branched betaine surfactants: Guerbet p-(n-tetradecyl)-benzyl carboxybetaine (C14GCB), Guerbet p-(n-dodecyl)-benzyl polyoxyethylene ether(2) carboxybetaine (C12GE2CB), Guerbet p-(n-tetradecyl)-benzyl polyoxyethylene ether(2) carboxybetaine (C14GCB) and Guerbet p-(n-hexadecyl)-benzyl polyoxyethylene ether(2) carboxybetaine (C16GCB), were investigated by drop shape analysis method at the water-decane interface. The dilational properties of surfactants were investigated as a function of time, frequency and concentration. The experimental results show that the time dependence was complex. It was also found that the dilational modulus were almost independent of frequency in the experimental concentration range for C14GE2CB and C16GE2CB, while the dilational modulus of C14GCB and C12GE2CB increased with the increase of frequency, sharing the same results with conventional zwitterionic surfactants. The results indicated the appearance of a more elastic film for the C14GE2CB and C16GE2CB due to the internal compression and expansion of oxyethylene units (EO). On the other hand, the surfactant with branched alkyl chain came forth a higher maximum value of dilational modulus compared with the straight chain surfactants with the increase of concentration, which means the branching of alkyl chain was another important factor to control the interfacial film.
Acknowledgement
The authors thank financial support from the National Science & Technology Major Project (2011ZX05011-004) and National Natural Science Foundation (51373192) of China.
©2015 Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Frontmatter
- Review Article
- Application of Polarization Modulation Infrared Reflection Absorption Spectrosocpy Under Electrochemical Control for Structural Studies of Biomimetic Assemblies
- Ultrasonic Velocity and Compressibility Studies of Tetraalkylammonium Salts in Acetonitrile + Methanol Binary Mixtures at 298.15 K
- The Au-PANI System. Synthesis and Catalytic Properties of Nanogold
- Synthesis of Azo Polyurethane-Urea and Investigation of its Thermo-Optic Properties
- Structure and Internal Dynamics of Acid K Salt of (E)-2-hydroxyimino-2-cyanoacetic Acid Ethyl Ester
- Interfacial Dilational Rheology of the Novel Zwitterionic Surfactants
- A DFT Study of CO and NO Adsorptions on AlN-, AlP-, and ZnO-doped Graphene Nanosheets
- Theoretical Studies Regarding the Aromaticity of Some Non-Planar Circulenes
