| Revista: | Polimeros (Sao Carlos) |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000314021 |
| ISSN: | 1678-5169 |
| Autores: | Martins, Ricardo M. de1 Silva, Carolina A Becker, Cristiane Samios, Dimitrios Bica, Clara I.D Christoff, Marcelo |
| Instituciones: | 1Universidade Federal do Rio Grande do Sul, Instituto de Quimica, Porto Alegre, Rio Grande do Sul. Brasil |
| Año: | 2002 |
| Volumen: | 12 |
| Número: | 2 |
| Paginación: | 109-114 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, analítico |
| Resumen en inglés | Fluorescence probing, viscosity and light scattering measurements have been combined to study the aggregation of different anionic surfactants mainly in dilute solutions (0.5% w/v) of (hydroxypropyl)cellulose (HPC MW 173,000), in moderate ionic strength (NaCl 0.1 mol.L-1). The set of surfactants includes natural cholesterol derivatives, sodium cholate (CS) and sodium deoxycholate (DC), and the alkylsulphate, sodium dodecylsulphate (SDS). At 298 K the critical surfactant concentration related to aggregate/HPC formation (C1) decreases for SDS and DC whereas it increases slightly for CS. At 312 K the C1 values for CS and DC are slightly shifted toward higher values whereas it is not changed for SDS. All surfactant/HPC systems increase C1 values as the HPC concentration increases to 1.2%. Above C1 the viscosity increases for all surfactant/HPC systems but it is sharper in the increasing order CS, DC and SDS. The hydrodynamic behavior indicates that CS induces higher diffusion to HPC than SDS and DC. The aggregation in the surfactant/HPC systems is analyzed through the feature of surfactant/aggregate structure (size, charge density, etc) |
| Disciplinas: | Química |
| Palabras clave: | Química orgánica, Agregados, Sales biliares, Hidrofobicidad, Hidroxipropil celulosa, Fluorescencia, Dispersión de luz, Viscosidad |
| Keyword: | Chemistry, Organic chemistry, Aggregate, Bile salts, Hydrophobicity, Cellulose hydroxypropyl, Fluorescence, Light scattering, Viscosity |
| Texto completo: | Texto completo (Ver HTML) |
