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

Abstract

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.

Synthesis and properties of cationic surfactants with tuned hydrophylicity

“…Pyridinium surfactants [1], in particular, are important as ingredients of cosmetic products [2], and are also used as corrosion inhibitors [3], in emulsion polymerization [4] and textile processing [5]. Within biological applications, they show a good antimicrobial activity [6] and can be used as drugs [7], gene delivery agents [8] or in DNA extraction methods [9].…”

Effect of N-cetylpyridinium chloride in adsorption of graphene oxide onto polyester

“…On the other hand, the H þ and OH À ions of the liquid phase determine the potential of PET, and the negative charge of the PET arises from the presence of carboxyl groups on the surface of the fabric. When the PET is treated with a 10 À4 M solution of the surfactant, the zeta potential values of the pretreated fabric are positive, probably owing to the pyridinium group of the surfactant, which is positively charged [15,16].…”

Pigment dyeing of polyamide‐epichlorohydrin cationized cotton fabrics

“…Colorant adsorption on different kinds of fibers is varied according to the colorants used, which can be analyzed by measuring the zeta potentials of fiber/dye interface. In works done by Espinosa‐Jimenez et al surface free energy and zeta potential of the adsorption process of colloidal dye Disperse Blue 3 onto polyester fabric were measured after the fabric was pretreated with N ‐cetylpyridinium chloride 16, 17. According to Yeung and Shang's research, the action of Ca 2+ or Mg 2+ on silk dyeing with reactive dyes was influenced by the electrokinetic properties of silk 18.…”