Journal
SYNTHETIC METALS
Volume 161, Issue 1-2, Pages 124-131Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2010.11.007
Keywords
Chitosan; Pd; Wool fabric; Chemical plating; Electromagnetic shielding fabric
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In this study, an effective deposition of Ni-P alloy on wool fabric is proposed by a chemical plating approach with PdCl2 solution and a carrier agent chitosan (CTS). CTS possesses strong ability to absorb metal ions through several mechanisms, such as electrostatic attraction and chelation, depending on the pH of the solution. The lowest surface resistance of the wool fabric is achieved when Pd (II) ions are absorbed in acid condition (around pH = 2.5). Sorption isotherms are obtained and modeled using Langmuir and Freundlich model and kinetic curves nicely fitted to the pseudo-first-order equation. Also, isotherms have been introduced to obtain the thermodynamic parameters, such as Gibbs free energy, enthalpy and entropy. The resulting positive value of the enthalpy indicates that the adsorption is an endothermic process. Conductive wool fabrics are characterized by scanning electron microscopy (SEM). Fourier transform-infrared (FT-IR) spectroscopy. Evidenced by SEM, CTS-Pd is found on the surface of fabrics and effectively activated the chemical plating. FT-IR shows the adsorption of Pd (II) ions on CTS is mainly controlled by physical adsorption. Mechanical and physical tests were investigated and the encouraging results show no significant modification and open new perspectives for future application of wool fabrics. (C) 2010 Elsevier B.V. All rights reserved.
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