Abstract
Shape memory alloys (SMA) have been applied to a wide variety of applications in a number of different fields such as aeronautical applications, sensors/actuators, medical sciences as well as orthodontics. It is a hot topic to enhance the anti-corrosion ability of orthodontic wires for clinical applications. In this letter, a very nice fractal structure, micro-domains with identical nanometer sized grooves, was obtained on the surfaces of the orthodontic wires with an oxygen plasma and acid corrosion. The concave parts of the grooves were dominated by titanium and convex parts were the same as the bulk wires. The micro-nano fractal structure generated a hydrophobic surface with the largest contact angle to water being about 157°. The titanium dominated nanolayer and the hydrophobicity of the surface resulted in jointly the great improvement of the anti-corrosion ability of the orthodontic wires. Because the fractal structures of the wires were formed automatically when they immersed in acidic environment, hence, the self-protection of the oxygen plasma-treated orthodontic wires in acidic environment indicates their potential applications in orthodontics, and should be also inspirable for other applications of SMA materials.
References
Andreason G F, Hilleman T B. An evaluation of 55 cobalt substituted Nitinol wire for use in orthodontics. J Am Den. Assoc, 1971, 82: 1373–1375
Schweitzer P A. Corrosion and Corrosion Protection Handbook. New York: M Dekker, 1983
Gao H, Herminghaus S, Lenz P, et al. Liquid morphologies on structured surfaces: From microchannels to microchips. Science, 1999, 283: 46–49
Abbott N L, Folkers J P, Whitesides G M. Manipulation of the wetability of surfaces on the 0.1-to 1-micrometer scale through micro-machining and molecular self-assembly. Science, 1992, 257: 1380–1382
Lenz P. Wetting phenomena on structured surfaces. Adv Mater, 1999, 11: 1531–1534
Onda T, Shibuchi S, Satoh N, et al. Super-water-repellent fractal surfaces. Langmuir, 1996, 12: 2125–2127
Tada H, Nagayama H. Chemical vapor surface modification of porous glass with fluoroalkyl-functionalized silanes. 2. Resistance to water. Langmuir, 1995, 11: 136–142
Jiang L, Feng X J. Design and creation of super-weting/antiweting surface. Adv Mater, 2006, 18: 3063–3078
Sun T L, Feng L, Gao X F, et al. Bioinspired surfaces with special wettability. Acc Chem Res, 2005, 38: 644–652
Feng F J, Niu J L, Liu F, et al. Towards understanding why a superhydrohobic coating is needed by water strides. Adv Mater, 2007, 19: 2257–2261
Patolsky F, Timko B P, Yu G H, et al. Detection, stimulation, and inhibition of neuronal signals with high-density nanowire transistor arrays. Science, 2006, 313: 1100–1104
Mann D, Kato Y K, Kinkhabwala A, et al. Electrically driven thermal light emission from individual single-walled carbon nanotubes. Nature Nanotechnology, 2007, 2: 33–38
Hsiao H, Miller D, Kellock A. Response surface study of resist etching in high density oxygen plasma and interactions of O2 plasma with NiFe, Cu, Ta, and Al2O3. J Vac Sci Technol A, 1996, 14: 1028–1032
Chusuei C C, Brookshier M A, Goodman D W. Correlation of relative X-ray photoelectron spectroscopy shake-up intensity with CuO particle size. Langmuir, 1999, 15: 2806–2808
Hu W, Manabe K, Furukawa T, et al. Lowering of operational voltage of organic electroluminescent devices by coating indium-tin-oxide electrodes with a thin CuOx layer. Appl Phys Lett, 2002, 80: 2640–2641
Hu W, Matsumura M, Furukawa K. Oxygen plasma generated copper/copper oxides nanoparticles. J Phys Chem B, 2004, 108: 13116–13118
Zhang G Y, Qi P F, Wang X R, et al. Selective etching of metallic carbon nanotubes by gas-phase reaction. Science, 2006, 314: 974–977
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Supported by the National Natural Science Foundation of China (Grant No. 30572067) and Ministry of Science and Technology of China
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Nie, Q., Ji, Z., Lin, J. et al. Surface nanostructures orienting self-protection of an orthodontic nickel-titanium shape memory alloys wire. CHINESE SCI BULL 52, 3020–3023 (2007). https://doi.org/10.1007/s11434-007-0460-1
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DOI: https://doi.org/10.1007/s11434-007-0460-1