Aerothermochemistry by Gregorio Millán Barbany

By Gregorio Millán Barbany

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Floc Restructuring in Varied Turbulent Mixing. J. Colloid Interface Sci. 147 (1991) 407 Leif Eriksson and Barbro AIm Institute for Surface Chemistry Box 5607 S-11486 Stockholm Sweden Amphophilic Cationic Polymers as Both Flocculants and Depollutants E. Ferrer and R. Audebert Abstract Linear and cross-linked cationic polystyrene derivatives were prepared and tested as flocculating agents towards some silica suspensions used as model of raw water. For a ratio of substitution of the aromatic ring by an alkyl ammonium group higher than 35 %, the linear polymers are water soluble and flocculate the silica suspensions according to a classical charge neutralization mechanism.

Ferrer and R. t partition chromatography, characterized by a partition coefficient, k. k = solute concentration in the polymer phase/solute concentration outside the gel. 05 kg/dm3): This relation is just obtained by using the k and A definition and expressing the mass conservation of the solute. e, the swelling of the gel. This expression of the absorption agrees well with the experimental results (see, for instance, Fig. 1). The corresponding k values are rep~rted in Table 1. It can be seen that k increases with the octanol/water partition coefficient and decreases with the solubility in water.

For the N-substituted derivatives of polystyrene, this hydrophobicity increases in the order: Triethyl < Dimethylbenzyl < Tributyl, but is always smaller than the hydrophobicity measured in micelles of classical n-alkyl chain surfactants (n > 10) or in associative polyelectrolytes [29]. 9 11/13 Fig. 5. Pyrene absorption (A %) versus the hydrophobicity of the polymer expressed by the relative ratio (II/la) of the first and third fluorescence peak of the pyrene. 18 mg/l. (. - Pure water; " - PET type polymers; polymers) 0 - PBZ type polymers; 0 - PBU type .

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