Water-cellulose interface, surfactant adsorption

There have been a number of studies concerning mixtures of anionic surfactants with either nonionics or cationics, but only a very few have addressed the kinetics of these complex systems [75, 76]. When looking at enhancement of anionic surfactant adsorption at the water-cellulose interface, Paria et al. [75] fonnd that the greatest rate increase could be achieved by pretreating the snrface with cationic surfactant, rather than using a mixed solution. 

Figure 17.4, in the absence of adsorbed ODTMA surfactant, the adsorption of 2-Naphthol does not exceed 20 pmol.g on the cellulose fibres. On the other hand, retention of 2-naphthol increased with the amount of ODTMA adsorbed up to a certain surfactant concentration close to the critical micellar concentration (CMC), then levelled off rapidly to a very small value. This behaviour has been correlated with the surfactant aggregation at the cellulose/water interface [26, 27, 29]. 

Trabelsi, S. and D. Langevin (2007). Co-adsorption of carboxymethyl-cellulose and cationic surfactants at the air-water interface. Langmuir 23 3) 1248-1252. 

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