Biomimetic synthesis of BaSO 4 nanotubes using eggshell membrane as template
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Ya-Ping Ding Department of Chemistry, Shanghai University, Shanghai 200436, People’s Republic of China
Shu-Yu Wang Department of Chemistry, Tongji University, Shanghai 200092, People’s Republic of China (Received 13 November 2003; accepted 6 May 2004)
BaSO4 nanotubes were biomimetically synthesized by the combined assembly of eggshell membrane and C12H25SH. The products were tubular structure with the external diameter of 90–140 nm and the length of 1.5–2.5 m. The formation mechanism was also investigated. It provided a novel method for the fabrication of inorganic oxysalt nanotubes.
The discovery of carbon nanotubes1 has initiated an exciting intellectual challenge and attracted a great deal of attention in both fundamental and industrial studies. Nanotubes have potential applications in many fields such as electronics, optics, catalysis, and energy storage/ conversion because of their unique properties. Furthermore, their tubular structure has prompted research into the physical and chemical properties that eventually may lead to the mimicking of biological channels by molecules confined in their inner nanospace. So far, lesser kinds of noncarbon nanotubes have been prepared compared with noncarbon nanoparticles, nanowires, and nanorods because of their difficulties in synthesis. The studies on inorganic nanotubes mainly focus on unitary element nanotubes (carbon,1 bismuth,2 etc.), and binary element nanotubes (such as metallic oxide,3–5 nitride,6 sulfide,7–10 etc.11–13). However, little research has been undertaken about multinary element nanotubes,14–19 especially BaSO4 nanotubes. BaSO4 has been widely used in the chemical industry, medical field, and in other fields. If BaSO4 has a tubular structure, into which can be pharmaceuticals, conductors or semiconductors, its medical effect would be greatly enhanced, and its potential application in electronic fields would also be achieved. At present, the synthesis strategies of noncarbon nanotubes are plasma arc discharge,20 carbon nanotubes templates,21 sol-gel method,22 hydrothermal reaction
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Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/JMR.2004.0395 J. Mater. Res., Vol. 19, No. 10, Oct 2004
http://journals.cambridge.org
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method,2,3,12 gas-solid phase reaction method,8 chiral lipid template,23,24 etc.,4–11,13–19 but the use of a biomembrane template to prepare inorganic nanotubes has not been reported. In this work, using eggshell membrane as template in combination with the n-dodecanethiol (C12H25SH), we synthesized BaSO4 nanotubes through a one-step reaction. This research provides a novel route for the formation of oxysalt nanotubes and increases the application of BaSO4. The outer shell of a fresh eggshell was discarded, and the remains were washed with de-ionized water to prepare the eggshell membrane for use. The eggshell membrane was fastened in a container to separate it into two horizontal compartments, into which were added 25 ml 0.1 mol/l Na2SO4 solution and 25 ml 0.1 mol/L BaCl2
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