Центральная Научная Библиотека УрО РАН

Вид документа : Статья из журнала
Шифр издания : 54/E 58
Автор(ы) : Enyashin A. N., Ivanovskii A. L.
Заглавие : Mechanical and electronic properties of a C/BN nanocable under tensile deformation
Место публикации : Nanotechnology. - 2005. - V. 16, N 8. - С. 1304-1310. - ISSN 0957-4484. - ISSN 0957-4484
Примечания : Bibliogr.: p. 1309-1310 (48 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Atomistic simulations are performed to investigate the structural, mechanical and electronic properties of a coaxial C/BN nanocable under axial elongation using molecular dynamics. Our results show that the mechanism of the breaking process essentially differs from those for initial single-walled carbon and BN nanotubes. The formation of a carbon as well as a -C-B-N-atomic chain connecting two cable fragments before fracture is obtained, and due to such bridges the cable can be stretched until complete rupture up to epsilon max~29% as compared with epsilon max~23% for a single-walled carbon nanotube. After breakage the opposite tips of cable fragments form different individual atomic morphologies and compositions and can have promising potential as electron emitters. The Young moduli of the C/BN cable and C-NT are comparable. An analysis of the electronic structure shows that during tensile deformation the C/BN cable retains the basic electronic characteristics (metallic-like for the inner carbon nanotube and dielectric for the outer BN tube); however, the bandgap between the highest occupied N 2p and lowest unoccupied B 2p states decreases from 4.0 to 1.2 eV
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Вид документа : Статья из журнала
Шифр издания : 54/H 65
Автор(ы) : Shveikin G. P., Polyakov E. V., Denisova T. A., Grigorov I. G., Shtin A. P.
Заглавие : Hierarchy of sizes and sorption selectivity of ultrafine particles of hydrated titania
Место публикации : International Journal of Nanotechnology. - 2006. - Vol. 3, № 1. - С. 39-46
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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Вид документа : Статья из журнала
Шифр издания : 54/G 96
Автор(ы) : Gusev A. I., Kurlov A. S.
Заглавие : Production of nanocrystalline powders by high-energy ball milling: model and experiment
Место публикации : Nanotechnology. - 2008. - Vol. 19, № 26. - С. 265302/1-265302/8
Примечания : Библиогр. : с. 265302/8 (8 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нанокристаллические порошки--карбид вольфрама
Аннотация: A model of high-energy ball milling of powders has been proposed. It is demonstrated that part of the energy is consumed for initiation of microstrains ε during milling and, hence, the process of the powder grinding is decelerated. An analytical expression has been deduced describing the size of nanocrystalline powder particles as a function of the milling time. The model and the experiment have been compared, using a powder of tungsten carbide (WC). The average size of the particles and the value of the microstrains in the ball-milled powder were determined by an x-ray method from broadening of diffraction reflections. The size of the particles was also evaluated using scanning electron microscopy and the sedimentation method
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Вид документа : Статья из журнала
Шифр издания : 54/E 58
Автор(ы) : Enyashin A. N., Gemming S., Seifert G.
Заглавие : DNA-wrapped carbon nanotubes
Место публикации : Nanotechnology. - 2007. - V. 18, № 24. - С. P. 245702(10 pp.): il.
Примечания : Bibliogr. : p. 245702-10(47 ref.)
ISSN: 0957-4484
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нанотрубки углеродные--дезоксирибонуклеиновая кислота
Аннотация: The stability and electronic properties of complexes of single-walled carbon nanotubes wrapped by homopolymeric single-stranded DNA molecules (CNT@DNA) are considered using a quantum mechanical density-functional tight-binding method (DFTB). A phenomenological model of the CNT@DNA formation energy depending on the nanotube radii is developed,which shows that the decoration of a CNT by a few DNA chains leads to a high water solubility of CNT@DNA. Pyrimidine-based DNAs are found to be more effective to wrap the CNTs than other DNAs. The densities of states of the CNT@DNA complexes are close to the superposition of those of the ‘free’ components with some additional states below the Fermi level. The band gap in a hybrid CNT@DNA system is determined by the competition between the Fermi levels of the ‘free’ DNA and CNT. In a few specific cases a considerable charge transfer from the DNA to the CNT was observed, combined with an additional gain in the CNT@DNA formation energy
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Сиглы отделов ЦНБ УрО РАН

  бр.ф. - Бронированный фонд

  бф - Научно-библиографический отдел

  БХЛ - Фонд художественной литературы

  ИИиА -Фонд исторической литературы в ЦНБ УрО РАН

  ИМЕТ -Отдел ЦНБ в Институте металлургии УрО РАН

  кх - Отдел фондов (книгохранениe)

  МБА - Межбиблиотечный абонемент

  мф - Методический фонд

  ок - Отдел научной каталогизации

  оку - Отдел комплектования и учета

  орф - Обменно-резервный фонд

  пф - Читальный зал деловой и патентной информации

  рк - Фонд редкой книги

  ч/з - Главный читальный зал

  эр - Зал электронных ресурсов

Сиглы библиотек институтов и НЦ УрО РАН

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