Special features for functionalization of carbon nanotubes nanopowders
Physical and mechanical properties of carbon nanotube (CNT) powders depend on the method of their synthesis and chemical refinement. In order to create new composite materials that contain CNT powders as a filler, it is necessary to achieve functionalization of powder surface. Functionalization of...
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Chuiko Institute of Surface Chemistry of NAS of Ukraine
2019-11-01
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| Series: | Хімія, фізика та технологія поверхні |
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| Online Access: | https://cpts.com.ua/index.php/cpts/article/view/521 |
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| author | N. O. Oliinyk G. D. Ilnytska G. A. Bazaliy I. M. Zaitseva M. A. Marinich O. M. Sizonenko A. S. Torpakov |
| author_facet | N. O. Oliinyk G. D. Ilnytska G. A. Bazaliy I. M. Zaitseva M. A. Marinich O. M. Sizonenko A. S. Torpakov |
| author_sort | N. O. Oliinyk |
| collection | DOAJ |
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Physical and mechanical properties of carbon nanotube (CNT) powders depend on the method of their synthesis and chemical refinement. In order to create new composite materials that contain CNT powders as a filler, it is necessary to achieve functionalization of powder surface.
Functionalization of MWCNT-A brand CNT powder surface using pulse processing by high voltage electric discharges (HVED) in liquid leads to changes in distribution of its particles by size, a decrease in amorphous carbon content and in powder thermostability. Sedimentation separation of powder after HVED processing leads to formation of powder in three size ranges (0.118–0.139, 2.639–20.895 and 2.44–33.701 µm). Thermochemical modification of CNT powders leads to an increase in specific surface area, total volume of pores and micropores, their mean radii, a decrease in impurities content, changes in distribution of its particles by size, a decrease in amorphous carbon content and in powder thermostability. Electrochemical reconstruction of the surface of specimens of initial MWCNT-A brand CNT powder allows decreasing impurities content, free energy of surface saturation by water vapor, specific magnetic susceptibility, electrokinetic potential as well as increasing specific surface area, pores total volume and hydrogen adsorption.
Consecutive application of these methods leads to a decrease in impurities content in MWCNT-A brand CNT powder and to changes of its physical and chemical characteristics. Mass share of impurities decreases 3.7 times, mass share of soluble impurities decreases 7 times, specific magnetic susceptibility increases 5.2 times, electrokinetic potential increases 7.8 times. Specific electric resistivity increases 1.3 times, which leads to changes of adsorption and structural characteristics of powder: specific surface area increases 1.4 times and free energy of surface saturation by water vapor decreases by 11.9 %, which means that surface becomes more hydrophobic. As a result of such changes, rate of hydrogen adsorption on powders surface increases by 46 % and the current density at the potential of –0.6 V increases by 50 %.
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| format | Article |
| id | doaj-art-5442d270af5b4e9f9c92ece822f08b0b |
| institution | DOAJ |
| issn | 2079-1704 2518-1238 |
| language | English |
| publishDate | 2019-11-01 |
| publisher | Chuiko Institute of Surface Chemistry of NAS of Ukraine |
| record_format | Article |
| series | Хімія, фізика та технологія поверхні |
| spelling | doaj-art-5442d270af5b4e9f9c92ece822f08b0b2025-08-20T02:47:03ZengChuiko Institute of Surface Chemistry of NAS of UkraineХімія, фізика та технологія поверхні2079-17042518-12382019-11-0110410.15407/hftp10.04.367Special features for functionalization of carbon nanotubes nanopowdersN. O. Oliinyk0G. D. Ilnytska1G. A. Bazaliy2I. M. Zaitseva3M. A. Marinich4O. M. Sizonenko5A. S. Torpakov6N. Bakul Institute for Superhard Materials of National Academy of Sciences of UkraineN. Bakul Institute for Superhard Materials of National Academy of Sciences of UkraineN. Bakul Institute for Superhard Materials of National Academy of Sciences of UkraineN. Bakul Institute for Superhard Materials of National Academy of Sciences of UkraineN. Bakul Institute for Superhard Materials of National Academy of Sciences of UkraineInstitute of Pulse Processes and Technologies of National Academy of Sciences of UkraineInstitute of Pulse Processes and Technologies of National Academy of Sciences of Ukraine Physical and mechanical properties of carbon nanotube (CNT) powders depend on the method of their synthesis and chemical refinement. In order to create new composite materials that contain CNT powders as a filler, it is necessary to achieve functionalization of powder surface. Functionalization of MWCNT-A brand CNT powder surface using pulse processing by high voltage electric discharges (HVED) in liquid leads to changes in distribution of its particles by size, a decrease in amorphous carbon content and in powder thermostability. Sedimentation separation of powder after HVED processing leads to formation of powder in three size ranges (0.118–0.139, 2.639–20.895 and 2.44–33.701 µm). Thermochemical modification of CNT powders leads to an increase in specific surface area, total volume of pores and micropores, their mean radii, a decrease in impurities content, changes in distribution of its particles by size, a decrease in amorphous carbon content and in powder thermostability. Electrochemical reconstruction of the surface of specimens of initial MWCNT-A brand CNT powder allows decreasing impurities content, free energy of surface saturation by water vapor, specific magnetic susceptibility, electrokinetic potential as well as increasing specific surface area, pores total volume and hydrogen adsorption. Consecutive application of these methods leads to a decrease in impurities content in MWCNT-A brand CNT powder and to changes of its physical and chemical characteristics. Mass share of impurities decreases 3.7 times, mass share of soluble impurities decreases 7 times, specific magnetic susceptibility increases 5.2 times, electrokinetic potential increases 7.8 times. Specific electric resistivity increases 1.3 times, which leads to changes of adsorption and structural characteristics of powder: specific surface area increases 1.4 times and free energy of surface saturation by water vapor decreases by 11.9 %, which means that surface becomes more hydrophobic. As a result of such changes, rate of hydrogen adsorption on powders surface increases by 46 % and the current density at the potential of –0.6 V increases by 50 %. https://cpts.com.ua/index.php/cpts/article/view/521carbon nanotube powderspowder modificationphysicochemical characteristics |
| spellingShingle | N. O. Oliinyk G. D. Ilnytska G. A. Bazaliy I. M. Zaitseva M. A. Marinich O. M. Sizonenko A. S. Torpakov Special features for functionalization of carbon nanotubes nanopowders Хімія, фізика та технологія поверхні carbon nanotube powders powder modification physicochemical characteristics |
| title | Special features for functionalization of carbon nanotubes nanopowders |
| title_full | Special features for functionalization of carbon nanotubes nanopowders |
| title_fullStr | Special features for functionalization of carbon nanotubes nanopowders |
| title_full_unstemmed | Special features for functionalization of carbon nanotubes nanopowders |
| title_short | Special features for functionalization of carbon nanotubes nanopowders |
| title_sort | special features for functionalization of carbon nanotubes nanopowders |
| topic | carbon nanotube powders powder modification physicochemical characteristics |
| url | https://cpts.com.ua/index.php/cpts/article/view/521 |
| work_keys_str_mv | AT nooliinyk specialfeaturesforfunctionalizationofcarbonnanotubesnanopowders AT gdilnytska specialfeaturesforfunctionalizationofcarbonnanotubesnanopowders AT gabazaliy specialfeaturesforfunctionalizationofcarbonnanotubesnanopowders AT imzaitseva specialfeaturesforfunctionalizationofcarbonnanotubesnanopowders AT mamarinich specialfeaturesforfunctionalizationofcarbonnanotubesnanopowders AT omsizonenko specialfeaturesforfunctionalizationofcarbonnanotubesnanopowders AT astorpakov specialfeaturesforfunctionalizationofcarbonnanotubesnanopowders |