R. Rajavel

Electrochemical deposition of a Zn-HNT/p(EDOT-co-EDOP) nanocomposite on LN SS for anti-bacterial and anti-corrosive applications

A copolymer composite of Zn-HNT/p(EDOT-co-EDOP) was deposited on low nickel stainless steel (LN SS) using an electrochemical polymerization method. The structure of the copolymer and the composite was confirmed by various analytical studies. In this work, the anticorrosion ability of the coatings was assessed in acidic solutions using an electrochemical method and their antibacterial activity was examined against marine bacteria.

Synthesis and catalytic properties of copper(II) Schiff-base complex immobilized silica materials

Cu(II) Schiff base complex immobilized silica was prepared via the one pot reaction of thiophene-2-carbaldehyde with silica functionalized 3-aminopropyltriethoxysilane (APTES) and copper acetate by refluxing in ethanol. The formation of this complex was confirmed by FT-IR, UV–DRS, XRD, SEM, EDX, ICP-AES and BET analytical methods. In addition, the catalytic activity of the as synthesized Cu(II) Schiff base complex immobilized silica was evaluated through the oxidative coupling of benzylamines to the corresponding imines. The catalyst was easily recovered and reused for five times without any significant loss of its catalytic activity.

Fabrication of Bilayer Coating of Poly(3,4-ethylenedioxythiophene)-Halloysite/Chitosan and Mg2+/Sr2+-Doped HAP on Titanium Alloy for Biomedical Implant Applications: Physicochemical and In Vitro Biological Performances Studies

The prime objective of the present work is to develop biocompatible overlayer-deposited titanium alloys to replace already available titanium alloy-based biomaterials for implantation applications. Here, we prefer to use a bilayer coating on titanium alloys instead of single coating. The adhesion and biocompatibility of titanium alloy is improved by coating with a bilayer, for example, PEDOT-HNT/CS-MHA composite using the electrochemical deposition method. Corrosion behavior of the PEDOT-HNT/CS-MHA bilayer composite coating was investigated in the PBS medium by polarization studies. The functional groups, phase purity, surface morphology, and wettability of the PEDOT-HNT/CS-MHA were characterized by various instrumental techniques like FTIR, XRD, SEM, and contact angle techniques. From the above studies, it is proved that PEDOT-HNT/CS-MHA-coated Ti alloy showing a better biocompatibility and corrosion resistance than the PEDOT-HNT-deposited Ti alloy. In addition, the in vitro bactericidal and cell viability studies were also carried out to further confirm the biocompatibility of the protective coating. Hence, the bilayer deposition has shown excellent stability and biocompatibility and can be used for the potential biomaterials for orthopedics applications.