Electrochemical Behaviour of Ti/Al2O3/Ni Nanocomposite Material in Artificial Physiological Solution: Prospects for Biomedical Application

Abstract

Inorganic-based nanoelements such as nanoparticles (nanodots), nanopillars and nanowires, which have at least one dimension of 100 nm or less, have been extensively developed for biomedical applications. Furthermore, their properties can be varied by controlling such parameters as element shape, size, surface functionalization, and mutual interactions. In this study, Ni-alumina nanocomposite material was synthesized by the dc-Ni electrodeposition into a porous anodic alumina template (PAAT). The structural, morphological, and corrosion properties were studied using x-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and electrochemical techniques (linear sweep voltammetry). Template technology was used to obtain Ni nanopillars (NiNPs) in the PAAT nanocomposite. Low corrosion current densities (order of 0.5 µA/cm2) were indicators of this nanocomposite adequate corrosion resistance in artificial physiological solution (0.9% NaCl). A porous anodic alumina template is barely exposed to corrosion and performs protective functions in the composite. The results may be useful for the development of new nanocomposite materials technologies for a variety of biomedical applications including catalysis and nanoelectrodes for sensing and fuel cells. They are also applicable for various therapeutic purposes including targeting, diagnosis, magnetic hyperthermia, and drug delivery. Therefore, it is an ambitious task to research the corrosion resistance of these magnetic nanostructures in simulated body fluid.

Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane

“…The primary attention of researchers is focused on the electrochemical synthesis of nanostructures and nanowires (NW) based on them using porous materials as a template. Porous materials (substrates) such as films of nanoporous anodic alumina [5][6][7], mica with etched nuclear tracks [8], polymer membranes [9,10], two-block copolymers [11], porous glasses with a nanochannel array of holes, and SiO 2 with nanocapillary pores [12][13][14] are used as porous templates. It is possible to form the arrays of parallel NWs using these porous materials as a template and multilayer NWs by changing the conditions of electrodeposition (voltage, current, electrolyte composition) [15,16].…”

Microcrystal alignment in drawn fiber over sub-meter to kilometer length scales

“…Since the 1980′s when carbon nanotubes were first reported, persistent attempts have been made to organize nanostructures and microcrystals [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], over macroscale dimensions, in order to fully exploit their excellent crystalline properties, including mechanical, electrical, thermal, and optical properties [16][17][18][19]. Here we report on a method to align stiff microcrystals of aspect ratio on the order of 10, using geometric confinement within an interior liquid shell layer of a polymer-host, composite fiber.…”

“…High-density arrays of aligned nanostructures were achieved in ordered matrices, including electrodeposition into a porous anodic alumina template [5,6] as well as electrodeposition into the pores of a polymer membrane [7]. Further attempts at aligning nanotubes, nanofibers, and nanowires have included electrospinning [8], microcombing [9] and evaporation processes [10].…”

Biocompatible Iron–Boron Nanoparticles Designed for Neutron Capture Therapy Guided by Magnetic Resonance Imaging

“…This is the case, for instance, of transformable nanoalloys of Au–Fe [ 9 ] or liquid Ga eutectics [ 10 ] that have the ability to spontaneously dissolve in physiological environments, as required to solve the crucial issue of the in vivo biopersistence of inorganic and organic nanomedicines. [ 11–14 ] In particular, composition, shape, and surface coating of alloys dramatically influence their resistance to corrosion in body fluids [ 15 ] that can change from high durability to rapid degradation. [ 9,16,17 ]…”