Catalytic Methods for Preparation of Composites Based on Polyethylene and Multilayer Carbon Nanotubes

Kuznetsov, V. L.; Semikolenova, Nina V.; Mikenas, Tatiana B.; Мосеенков, С. И.; Matsko, Mikhail A.; Kazakova, Мariya A.; Захаров, В. А.; Zdanovich, A. A.; Koshevoi, E. I.

doi:10.18412/1816-0387-2016-4-13-19

Cited by 5 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was interesting to compare this value with any independent data on the average distance between nanotubes in the aerogel. Unfortunately the analysis of average distances between MWCNTs using SEM images of aerogel is a complex task that requires obtaining tomographic images and extremely time‐consuming statistical analysis due to the tangled structure of curved nanotubes. So we used the analysis based on the volume fraction of nanotubes.…”

Section: Experiments On An Aerogel and Simulation Resultsmentioning

confidence: 99%

“…In the case of aerogels, the technological capabilities make it possible to manufacture such samples in the form of plates, washers, etc., whose dimensions exceed the beam aperture already in the low‐frequency (from 100 GHz) part of the terahertz range (Figure ). Flat MWCNT aerogel samples were synthesized via the original one‐step technique using preformed thin round tablets of Fe–Co/CaO catalyst at 650–700 °C in C 2 H 4 /Ar feedstock . The molded catalyst powder provides a multi‐center intensive growth of tangled nanotubes, accompanied by a sharp increase in the volume of the molded preform, which leads to the formation of an aerogel structure that repeats the shape of the primary molded catalyst.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Interaction of Multiwalled Carbon Nanotube Aerogels with Quasi‐Optical Terahertz Beams

Dorofeev

Suslyaev

Мосеенков

et al. 2019

Physica Status Solidi (b)

View full text Add to dashboard Cite

This article presents the measurements of the reflectance from a plane‐parallel aerogel sample formed by multiwalled carbon nanotubes (MWCNTs) in the terahertz range. With an increase in frequency from 100 GHz to 1.5 THz, the reflectance decreases by more than a factor of two. Based on the experimental data and the well‐known wire medium model formed by a three‐dimensional lattice of intersecting conductors, a model of a regular wire medium is constructed using MWCNTs with effective electrophysical characteristics equivalent to those of an irregular aerogel medium. This model reveals that a significant drop in the reflectance in the terahertz frequency range occurs because the plasma frequency of the equivalent medium is located here. The model allows estimating the properties of the aerogel environment in the frequency range extending up to 5 THz and with variations in the packing density of MWCNTs in aerogel. Estimates of the reflection, transmission, and absorption are presented for the case of normal incidence on a thin (submillimeter) layer of such a medium. The aerogel absorption at a given conductivity of CNTs is determined by their packing density.

show abstract

Section: Experiments On An Aerogel and Simulation Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Interaction of Multiwalled Carbon Nanotube Aerogels with Quasi‐Optical Terahertz Beams

Dorofeev

Suslyaev

Мосеенков

et al. 2019

Physica Status Solidi (b)

View full text Add to dashboard Cite

show abstract

“…Multiwalled carbon nanotubes were produced by an in situ high-temperature decomposition of ethylene on the FeCo/Al 2 O 3 catalyst as described in ref. The average diameter of the CNT was 7.8 nm.…”

Section: Methodsmentioning

confidence: 99%

Composite Sorbents Based on Carbon Nanotubes and K₂CO₃ for CO₂ Capture from Ambient Air

Derevschikov,

Kuznetsov,

Veselovskaya

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

K 2 CO 3 -containing sorbents supported on carbon nanotubes (CNT) were prepared via one-pot extrusion molding and heat treatment. The porous CNTs were mixed with a waterisopropyl alcohol solution of potassium acetate (CH 3 COOK) and extruded by a plunger extruder. After drying in air, extrudates were calcined at 500 °C in argon to obtain the sorbents with a K 2 CO 3 weight content in a range of 13.1−44.8 wt %. Samples were characterized using various techniques (scanning electron microscopy (SEM), X-ray diffraction (XRD), and low-temperature nitrogen adsorption) and were tested in the process of carbon dioxide capture from ambient air. The sorbent with 44.8 wt % K 2 CO 3 demonstrated the promising dynamic CO 2 -sorption capacity (up to 8.9 wt %) under temperature-swing adsorption (TSA) cycle conditions. Taking into account that the sorbents need a relatively low temperature for regeneration (150 °C) while demonstrating high CO 2 -sorption capacity in the sequence of TSA cycles, these sorbents may be of interest for direct air capture applications.

show abstract

“…MWCNT aerogels were synthesized via the original one‐step technique . The Fe‐Co/CaO catalyst was produced via polymerized complex route (the Pechini technique) .…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic Interaction Between Spherical Aerogels of Multi‐Walled Carbon Nanotubes

Krasnikov

Dorofeev

Smirnova

et al. 2017

Physica Status Solidi (b)

View full text Add to dashboard Cite

Lightweight materials for efficient electromagnetic interference shielding over a wide range of frequency are of great interest. Aerogels of multi-walled carbon nanotubes (MWCNTs) distributed in a dielectric matrix may interact effectively with electromagnetic radiation. Moreover, being arranged in specific patterns, they can also provide metamaterial characteristics (e.g., negative refractive index). In the present paper, we have studied the interaction between two spheres of the carbon nanotube aerogels in order to obtain a comprehensive basis for producing periodic 2D and 3D structures of such aerogel spheres in a dielectric matrix. We have extended the open resonator technique to the case of two units of MWCNT aerogels in order to reveal the interaction between them. The performance of the system depends on the orientation of the electric field to the axis of the aerogel cluster: MWCNT aerogel spheres (d ¼ 4.5 mm) interact considerably at the gap between spheres $0.2λ (11.6 GHz) for perpendicular orientation, while, in case of axial orientation, the interaction is negligible even at the distances close to the contact between aerogels ($0.02λ). Additionally, the cluster of two carbon nanotube aerogel spheres provides the polarizability close to that of copper spheres while having only 1% of their weight.

show abstract

Catalytic Methods for Preparation of Composites Based on Polyethylene and Multilayer Carbon Nanotubes

Cited by 5 publications

References 0 publications

Interaction of Multiwalled Carbon Nanotube Aerogels with Quasi‐Optical Terahertz Beams

Interaction of Multiwalled Carbon Nanotube Aerogels with Quasi‐Optical Terahertz Beams

Composite Sorbents Based on Carbon Nanotubes and K₂CO₃ for CO₂ Capture from Ambient Air

Electromagnetic Interaction Between Spherical Aerogels of Multi‐Walled Carbon Nanotubes

Contact Info

Product

Resources

About

Catalytic Methods for Preparation of Composites Based on Polyethylene and Multilayer Carbon Nanotubes

Cited by 5 publications

References 0 publications

Interaction of Multiwalled Carbon Nanotube Aerogels with Quasi‐Optical Terahertz Beams

Interaction of Multiwalled Carbon Nanotube Aerogels with Quasi‐Optical Terahertz Beams

Composite Sorbents Based on Carbon Nanotubes and K2CO3 for CO2 Capture from Ambient Air

Electromagnetic Interaction Between Spherical Aerogels of Multi‐Walled Carbon Nanotubes

Contact Info

Product

Resources

About

Composite Sorbents Based on Carbon Nanotubes and K₂CO₃ for CO₂ Capture from Ambient Air