1. The term 3D coherent ordering means self organization of bulk SWCNT and their composites in process of synthesis,
dispersion and condensed phase formation, which leads to appearance of 3D electronic and vibrational coherence between carbon nanotubes.
2. Intermolecular coherent interactions can appear between nanotubes, which are in absolutely identical structural and electronic state only.
3. That is, conditions of 3D coherent ordering are very sensitive to any type of disorder and defects.
4. The standard modifications of SWCNT can differ by diameter and diameter distribution, tube length and length distribution, chirality and chirality distribution,
concentration of different types of defects, and defects distribution. Besides they can be metallic and semiconducting.
5. When concentration of nanotubes, which are in absolutely identical state, exceeds certain limit, 3D intermolecular coherent vibrations appear and system transforms to macroscopic coherent state.
6. We suppose that 3D coherently ordered metallic SWCNT with very low concentration of defects should be high-temperature superconductors.
1. There are two approaches to develop of 3D coherently ordered SWCNT and their gels and composites.
2. The first approach is high-temperature matrix synthesis of SWCNT. For example, synthesis of SWCNT at the active support, surface of which chemically modified by highly ordered catalyst.
3. The second approach is cleaning and self organization soluble suspensions of SWCNT in high viscous medium.
1. Supermat Intl. develops new method of solubilization of metallic and semiconducting SWCNT in organic solvents.
2. It was shown that SWCNT (1), bipolar molecules (2) and polar polymers (3) form ternary complexes (1-2-3), which are soluble in organic solvents.
3. Dispersions (gels, high viscous solutions) of SWCNT were used for cleaning SWCNT from defects and preparation of fractions with different solubility.
4. Based on results obtained 3D coherently ordered nano-gels and nano-composites of SWCNT in different polymeric matrices were elaborated.
1. It was shown, that both metallic and semiconducting forms of SWCNT can be dispersed in organic solvents.
2. 3D coherently ordered nano-gels and nano-composites of SWCNT are characterized by exceptionally high intensity of Raman scattering.
3. Currently we produce highly ordered (special cleaning) SWCNT and 3D coherently ordered nano-composites of SWCNT in poly-oxy-ethylene matrix.
Composites can be prepared in the form of highly viscous solutions, gels and films with thickness of 50 - 200 microns.
2-2 Emitters and receivers of coherent electromagnetic radiation.
2-3 High power opto-electronic devices.
Fig. 1 The IR spectra of poly-p-phenylene films vacuum deposited on KBr substrate. Conditions of film formation: evaporation temperature 680C; substrate temperature 300C.
Fig. 2 Dependence of two vibronic bands position in room temperature luminescence spectrum of poly-p-phenylene film on the frequency of excitation.
It was shown that increase of support temperature to 300C (Fig. 1) results in decrease of the intensity of 1480 cm-1 band is assigned to C=C skeletal vibration of phenylene rings
and formation of new band at 1375 cm-1 with abnormally high intensity, which could be assigned to quinoid structure of poly-p-phenylene film. Site selective luminescence spectra
(dependence of vibrational bands emission frequency versus excitation frequency) of these films characterized (Fig. 2) by sharp transition between field, where vibronic band position has no
dependence on excitation frequency and site selective field, where vibronic band position has linear dependence on excitation frequency. It is known that sharp transitions between resonant excitation field and site selective
field in luminescence spectra of standard conjugated polymers are observed for very low temperatures only.
Abnormally high intensity of skeletal vibrations in IR spectra and sharp transitions in site selective luminescence spectra is convincing evidence of 3D coherent ordering of non-degenerate conjugated polymers.
Magnetic field effects on photoluminescence in PPP. Investigation of the influence of chain length and degree of order.
Frankevich, E. L.; Zoriniants, G. E.; Chaban, A. N.; Triebel, M. M.; Blumstengel, S.; Kobryanskii, V. M. Chem. Phys. Lett. (1996), 261(4,5), 545-550.
Exciton localization in thin polymer films probed by selective fluorescence spectroscopy. Drobizhev, M. A.; Sapozhnikov, M. N.; Kobryanskii, V. M., J. Lumin. (1997), 72-74 490-493.
Formation of quinoid fragments in vacuum-deposited poly-para-phenylene films: IR spectroscopy evidence. Kobryanskii, V. M.; Kotova, S. L. J. Polym. Sci., Part A: Polym. Chem. (1998), 36(7), 1043-1052.
3D coherently ordered gels of some big conjugated molecules possess properties of high-temperature BEC.
The term 3D coherently ordered conjugated system means system with 3D electronic and vibrational coherence between conjugated molecules,
macromolecules and nanoparticles.