Origin, characterization and technological effects of interaction forces proceeding from polymer surfaces

Padilla-Weigand

et al. 2003

Macro Materials & Eng

In this work are presented results about the effect on the surface free energy and zeta potential for the adsorption process of the colloidal dye Disperse Blue 3 (DBlue3) onto polyester fabric (dacron 54, stile 777), when the fabric is pretreated with N‐cetylpyridinium chloride (NCPCl). The zeta potential of the fabric as a function of the pH of the liquid phase shows that both H+ and OH− ions are involved in determining the potential. The negative charge of the fiber is caused by the presence of the carboxyl end‐groups of the polyester, which are generated by the acidic and basic hydrolysis of the fabric in these media. The zeta potential of the DBlue3 as a function of the pH of the liquid phase shows that the negative charge of the dye particles are because of the presence of an OH− group, ionized in aqueous media, in the molecular structure of the dye. The zeta potential of the fabric treated with a 10−3 M solution of NCPCl as a function of the pH of the liquid phase is positive over the whole pH range. This behavior can be attributed to the presence of the pyridinium group in the molecular structure of the surfactant, which is positively charged. The adsorption isotherms of the dye DBlue3 onto a polyester pretreated with NCPCl at 293 K, shows that the presence of the surfactant on the surface of the fabric favors the adsorption of the dye onto the fabric. This fact shows that the pretreatment with NCPCl is a very interesting aspect in the textile industry. On the other hand, the isotherms of the adsorption of the above dye onto the polyester pretreated with a 10−4 M solution of NCPCl, at different temperatures, shows that the amount of the dye absorbed onto the pretreated fabric increases with the increase in temperature. These behaviors can be justified by the analysis of the components of the surface free energy and zeta potential.Electron microscopy photographs of the fabric pretreated with NCPCl before (top) and after (bottom) dyeing with DBlue3.magnified imageElectron microscopy photographs of the fabric pretreated with NCPCl before (top) and after (bottom) dyeing with DBlue3.

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Section: Surface Thermodynamicssupporting

confidence: 93%

Interpretation of Colloidal Dyeing of Polyester Fabrics Treated with N‐Cetylpyridinium Chloride in Terms of Zeta Potential and Surface Free Energy Balance

Padilla-Weigand

et al. 2003

Macro Materials & Eng

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“…The starting point is Young's equation, written as [7] where ␥ Li is the surface tension of liquid i forming a contact angle on the solid and ␥ Li LW , ␥ Li ϩ , and ␥ Li Ϫ are the surface tension components of the liquid.…”

Section: Theorymentioning

confidence: 99%

Effect of Tannic Acid on the ζ Potential, Sorption, and Surface Free Energy in the Process of Dyeing of Leacril with a Cationic Dye

Giménez-Martı́n

Journal of Colloid and Interface Science

1998

“…For pH < 4 the zeta potential has a tendency to positive values, which we ascribe to H + adsorption, being the isoelectric point of the material 1.8. Jacobasch and coworkers have obtained the value of 2.0 for the above parameter (23). As the pH increased, the dissociation of carboxyl groups of polyester renders the surface increasingly negative, and for above pH > 8, ζ does increase again toward more negative values, probably indicating direct OH − adsorption on the fiber.…”

Section: Zeta Potential In the Polyester/n-cp-cl Systemmentioning

confidence: 95%

Electrokinetic and Thermodynamic Analysis of the Adsorption Process of N-Cetylpyridinium Chloride on Polyester Fabric

Padilla-Weigand

Journal of Colloid and Interface Science

et al. 2002