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Alekseev N.I.,RAS Ioffe Physical - Technical Institute | Goncharov V.D.,Saint Petersburg State University | Charykov N.A.,ZAO Innovations of Leningrad Institutes and Enterprises
Russian Journal of Physical Chemistry A | Year: 2010

The theoretical foundations of technology for synthesizing overlength carbon nanotubes (i.e., nanotubes of length in ones and tens of cm) were developed that are promising for use as catalyst carriers, heavy duty cables, micro-mechanical activators, electrode components, composite materials, and so on. It was shown that to obtain overlength nanotubes CVD (chemical vapor deposition) technology employing a number of additional conditions (placement of the catalyst nanoparticles at a specified and controlled distance from one another, electromagnetic heating of the substrate, and choosing a gas-phase carbon carrier) is optimal. Technical ways to achieve these conditions are outlined. © 2010 Pleiades Publishing, Ltd. Source


Alekseev N.I.,RAS Ioffe Physical - Technical Institute | Goncharov V.D.,Saint Petersburg State University | Charykov N.A.,ZAO Innovations of Leningrad Institutes and Enterprises
Russian Journal of Physical Chemistry A | Year: 2010

A model of nucleation of carbon nanotubes (CNTs) from catalytic particles oversaturated with carbon has been constructed. The temperature dependences of the number and size of nanotubes on the parameters of the model were derived. The nanotubes begin to grow as individual nanotubes. Then the axis of the nanotube starts to vibrate relative to the normal to the particle surface. In a certain range of conditions, the nanotubes are united into bundles. The diagram of the domains of existence of individual nanotubes and bundles was plotted as the particle size versus temperature. © 2010 Pleiades Publishing, Ltd. Source


Semenov K.N.,Saint Petersburg State University | Kanterman I.G.,Saint Petersburg State University | Charykov N.A.,ZAO Innovations of Leningrad Institutes and Enterprises | Murin I.V.,Saint Petersburg State University | Kritchenkov A.S.,Saint Petersburg State University
Russian Journal of Physical Chemistry A | Year: 2014

Solubility in the ternary fullerenol-d-CuCl2-H2O system at 25°C is studied by means of isothermal saturation in ampoules. It is established that the diagram consists of two branches corresponding to the crystallization of fullerenol-d crystallohydrate and copper(II) chloride dihydrate and contains a single non-variant eutonic point corresponding to the reciprocal saturation with both solid phases. The salting-in effect on the crystallization branch of CuCl2 · 2H2O and the salting-out effect on the crystallization branch of fullerenol-d is revealed. © 2014 Pleiades Publishing, Ltd. Source


Semenov K.N.,Saint Petersburg State University | Charykov N.A.,ZAO Innovations of Leningrad Institutes and Enterprises
Russian Journal of Physical Chemistry A | Year: 2012

Solubility in a ternary fullerenol-d-NaCl-H 2O system is studied at 25°C with the use of isothermal saturation. It is established that the solubility diagram is composed of two branches that are responsible for the crystallization of fullerenol-d crystallohydrate and anhydrous sodium chloride, and it contains one invariant eutonic-type point that corresponds to cosaturation by the above two solid phases. The so-called salting-out effect was observed on the branch of the crystallization of fullerenol-d, while salting in was observed on the branch of the crystallization of sodium chloride. © 2012 Pleiades Publishing, Ltd. Source


Sherstnev V.V.,RAS Ioffe Physical - Technical Institute | Charykov N.A.,ZAO Innovations of Leningrad Institutes and Enterprises | Semenov K.N.,ZAO Innovations of Leningrad Institutes and Enterprises | Alekseev N.I.,RAS Ioffe Physical - Technical Institute | And 2 more authors.
Russian Journal of Physical Chemistry A | Year: 2011

Nonlinear optical properties (particularly optical limiting) are determined for solutions of heavy fullerenes C76 + C78 + C 84 + C90 + ⋯, in the near-ultraviolet region (λ ≈ 280 ± 7 nm). It is shown that no optical limiting is observed in solutions of light fullerenes (C60 and C70), but found in solutions of water-soluble fullerenol-d (a mixture of oxypolyalcohols of fullerene C60-C60(OH) n1O n2, with their sodium salts) based on light fullerenes. © 2011 Pleiades Publishing, Ltd. Source

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