Iodine confined in single-walled carbon nanotubes(SWNTs)exhibits novel structural properties. Iodine molecules adopt electrons from SWNTs to form charged polyiodide chains In(n=3,5…)，and interestingly，the polyiodid...
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Iodine confined in single-walled carbon nanotubes(SWNTs)exhibits novel structural properties. Iodine molecules adopt electrons from SWNTs to form charged polyiodide chains In(n=3,5…)，and interestingly，the polyiodide chains array in the form of single，double or triple helical structures inside different diameters of SWNTs. We investigated the structural transition of iodine confined in SWNTs using Raman spectroscopy. The results show that charged polyiodide chains in SWNTs transform into iodine molecules with temperature increasing，while the reverse process occurs when the temperature decreases. Due to this reversible transition is accompanied by electron transfer between iodine and SWNTs，iodine filled SWNTs provides an approach to modulate the electronic band structure of SWNTs via varying temperatures. This may have some applications in nano-electroniCS based on carbon nanotubes with specific properties.
Polyurethane/montmorillonite nano-composites were synthesized,and then used for fiber *** viscosity of the spinning solutions,dispersion of montmorillonite in cast films and drawn fibers,as well as the mechanical prop...
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Polyurethane/montmorillonite nano-composites were synthesized,and then used for fiber *** viscosity of the spinning solutions,dispersion of montmorillonite in cast films and drawn fibers,as well as the mechanical properties of polyurethane/montmorillonite fibers were *** results indicated that the viscosities of spinning solutions containing montmorillonite were lower than that of the pure polyurethane solution,and the viscosity of spinning solutions increased after standing 24 h at room *** images showed that montmorillonite particles were dispersed at the scale from nanometer to micrometer in fiber *** with pure PU fibers,the mechanical properties of polyurethane/montmorillonite composite fibers were not improved except that the elongation at break was slightly increased.
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