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Fabrication and Properties of Titania Nanotube Arrays by Anodic Oxidation

Author: LiangJianHe
Tutor: XiaoXiuFeng；LiuZuoFang
School: Fujian Normal University
Course: Inorganic Chemistry
Keywords: Drug delivery Anodic oxidation method TiO2 nanotube arrays Thermal stability Biological Activity
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 149
Quote: 1
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Abstract


In this paper, the electrochemical anodic oxidation method to build a layer of Ti02 nanotube arrays on the surface of the titanium in the fluorine-containing electrolyte by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) by means of The morphology and structure of TiO2 nanotube arrays were characterized and studied the oxidation voltage, ambient temperature and the type of electrolyte process parameters on the morphology of nanotube arrays. The results showed that: glycerol / water mixing system, the TiO2 nanotube arrays can be prepared in the oxidation of a wide voltage range; within the same oxidation time, the nanotube diameter and tube length with the oxidation voltage increases; oxidation voltage is 100V, the nanotubes dispersed nanotubes dispersed on a titanium substrate, nanotubes obvious bifurcation structure; improve the ambient temperature, which permits the manufacturing of nanotubes pore size, but Mr. tube length increases significantly reduced; suitable moisture content of TiO2 nanotube array is prepared at a high voltage closely arranged key; added a small amount of state (NH4) 28O4, NH4H2PO4 and (NH4) 2TiF6 modified glycerol / H2O electrolysis solution can be prepared longer TiO2 nanotube arrays. Glycerol / DMF mixed system, the TiO2 nanotube arrays at low voltage surface oxide agglomeration significantly mitigate, as the voltage increases the surface agglomeration; most of the sample surface accumulation of more granular sediments. Direct Preparation of TiO2 nanotube arrays is amorphous, annealing treatment will be a series of phase transformation occurs in the air. After annealing at 450 ℃ amorphous into anatase phase after 600 ° C annealing rutile, rutile phase increased the proportion of 700 ° C annealing, the nanotube array structure remains intact, shows high thermal stability sex. Glycol system and DMF / glycerol system prepared TiO2 nanotube arrays after annealing the sample particles, the lower thermal stability. In addition, the wetting properties of TiO2 nanotube arrays, nanotube layer and the substrate binding force, biological activity and corrosion resistance, etc.. The results show that the improved hydrophilicity of the surface of the anodized titanium metal: the nano-tube layer and the bonding strength with the substrate oxidation voltage and enhanced with the annealing temperature increases, but if the initial bonding strength of the nano-tube layer and the substrate oxidation of the titanium substrate is too low, the annealing treatment of the nano-tube layer off; analog mineralization in vitro tests showed that after the anodic oxidation of titanium metal bioactive improved; showed that the corrosion resistance after anodizing titanium metal by an electrochemical test decline, but the corrosion resistance with annealing temperature increased gradually increased. Furthermore, calcium and phosphorus-containing TiO2 nanotube arrays were prepared by two-step method, ie anodic oxidation of phosphorus-containing TiO2 nanotube arrays, and then through the saturated Ca (OH) 2 solution water treatment calcification. Easy to Ca (OH) 2 reaction rectangular columnar calcium titanate showing the crystalline phase of TiO2 in strong alkaline conditions, the nanotube structural damage; without amorphous TiO2 nanotube arrays after hydrothermal treatment calcification, can still maintain nanotube array structure. Analog mineralization in vitro tests showed that calcium and phosphorus-containing TiO2 nanotube arrays with better biological activity. Finally, the use of TiO2 nanotube arrays with good adhesion with the titanium substrate and has a hollow structure features, try as drug delivery. By vacuum drying method such as bovine serum albumin, lysozyme and cephradine given drug load to the nanotube, the load sustained release drug in a few days. At the same time a high aspect ratio TiO2 nanotube arrays with bovine serum albumin adsorption and desorption.

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