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Studies on anionic surfactant structure in the aggregation with (hydroxypropyl)cellulose

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Studies on anionic surfactant structure in the aggregation with (hydroxypropyl)cellulose

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Título Studies on anionic surfactant structure in the aggregation with (hydroxypropyl)cellulose
Autor Martins, Ricardo Martins de
Silva, Carolina A. da
Becker, Cristiane Miotto
Samios, Dimitrios
Bica, Clara Ismeria Damiani
Christoff, Marcelo
Abstract Abstract: 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).
Contido em Polímeros (São Carlos): ciência e tecnologia. São Carlos, SP. Vol. 12, n. 2 (abr./jun. 2002), p. 109-114
Assunto Espalhamento de luz
Surfactantes aniônicos
[en] (Hydroxypropyl) Cellulose
[en] Aggregate
[en] Bile salt
[en] Fluorescence
[en] Hydrophobic
[en] Light scattering
[en] Viscosity
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/19545
Arquivos Descrição Formato
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