New self-assembling systems based on bola-type pyrimidinic surfactants
| Autor: | Vyacheslav Semenov, Victor V. Syakaev, Lucia Ya. Zakharova, V. S. Reznik, Azat Bilalov, Rashit Giniyatullin, Farida G. Valeeva, M. V. Voronin, A. R. Ibragimova, Alexander I. Konovalov, Shamil K. Latypov |
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| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Steric effects Conductometry Chemistry Cetrimonium Cationic polymerization Bolaamphiphile Electric Conductivity Pyridinium Compounds Micelle Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Diffusion chemistry.chemical_compound Surface-Active Agents Colloid and Surface Chemistry Bromide Amphiphile Polymer chemistry Cetrimonium Compounds Organic chemistry Surface Tension Counterion Micelles |
| Zdroj: | Journal of colloid and interface science. 342(1) |
| ISSN: | 1095-7103 |
| Popis: | New amphiphilic pyrimidinic (AP) compounds with two ammonium head groups and different kinds of counterions, inorganic bromide anions (APB) and hydrophobic tosylate anions (APT) were synthesized. Self-organization in these systems has been studied by methods of tensiometry, conductometry, potentiometry and NMR spectroscopy. The critical micelle concentrations (cmc's) of bola-type surfactants are only a little lower than those of cetyltrimethylammonium (CTA) analogues. For both pairs APB/CTAB and APT/CTAT the counterion binding is stronger for the conventional cationic surfactants as compared to 'bola' pyrimidinic surfactants. Unlike the CTAT micelles no sharp micellar growth occurs with the APT concentration. The geometry of AP compounds is assumed to be mainly responsible for the above finding. A branched molecular architecture prevents a close packing of the monomers in the bulk solution and at the interface producing a steric hindrance around the head groups. |
| Databáze: | OpenAIRE |
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