It is given the description of expanded graphite (EG) as a cluster-assembled nanoscale system. It is shown that in the structure of EG there are both extended defects formed by the convolution of one or more graphene layers and orientation defects - disclination. The strength characteristics of EG compacted materials can be controlled by changing the parameters of the production process in a limited interval (the ratio of the amount of oxidizing agent, intercalant, with natural dispersed graphite, its particle size). The procedure for treating multiwalled carbon nanotubes (MW CNTs) with a solution of potassium dichromate in sulfuric acid was carried out according to the known technology of oxidation of natural graphite in order to obtain expandable graphite. It provides for the use of sulfuric acid as an intercalating agent and potassium dichromate (K2Cr2O7) as an oxidizing agent. The aqueous dispersion of oxidized MW CNTs is stable over time: the average particle size is 50 nm; two fractions - from 20 to 100 nm, amount - 99.9%, mass - 10%; from 250 to 500 nm and amount of 0.1%, mass - 90%; high polydispersity ranges from 0.35-0.4, that is, the particles are quite close to the spherical shape. Modification of CNTs by oxygen simultaneously with anodic oxidation of natural dispersed graphite allowed for the first time to create a carbon-carbon composite "EG – MW CNTs" with enhanced physical and mechanical characteristics without additional use of binders.
Published in | International Journal of Materials Science and Applications (Volume 8, Issue 6) |
DOI | 10.11648/j.ijmsa.20190806.16 |
Page(s) | 127-134 |
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
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Copyright © The Author(s), 2019. Published by Science Publishing Group |
Expanded Graphite, Multi-walled Carbon Nanotubes, Carbon-Carbon Composite, Oxidative Intercalation, Declination
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APA Style
Sementsov Yurii, Grebel’na Yulia, Strelchuk Victor, Dovbeshko Galyna, Zhuravskyi Serhii, et al. (2019). Carbon-Carbon Composition “Expanded Graphite – Multiwalled Carbon Nanotubes”. International Journal of Materials Science and Applications, 8(6), 127-134. https://doi.org/10.11648/j.ijmsa.20190806.16
ACS Style
Sementsov Yurii; Grebel’na Yulia; Strelchuk Victor; Dovbeshko Galyna; Zhuravskyi Serhii, et al. Carbon-Carbon Composition “Expanded Graphite – Multiwalled Carbon Nanotubes”. Int. J. Mater. Sci. Appl. 2019, 8(6), 127-134. doi: 10.11648/j.ijmsa.20190806.16
AMA Style
Sementsov Yurii, Grebel’na Yulia, Strelchuk Victor, Dovbeshko Galyna, Zhuravskyi Serhii, et al. Carbon-Carbon Composition “Expanded Graphite – Multiwalled Carbon Nanotubes”. Int J Mater Sci Appl. 2019;8(6):127-134. doi: 10.11648/j.ijmsa.20190806.16
@article{10.11648/j.ijmsa.20190806.16, author = {Sementsov Yurii and Grebel’na Yulia and Strelchuk Victor and Dovbeshko Galyna and Zhuravskyi Serhii and Makhno Stanislav and Wang Bo and Kartel Mykola}, title = {Carbon-Carbon Composition “Expanded Graphite – Multiwalled Carbon Nanotubes”}, journal = {International Journal of Materials Science and Applications}, volume = {8}, number = {6}, pages = {127-134}, doi = {10.11648/j.ijmsa.20190806.16}, url = {https://doi.org/10.11648/j.ijmsa.20190806.16}, eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmsa.20190806.16}, abstract = {It is given the description of expanded graphite (EG) as a cluster-assembled nanoscale system. It is shown that in the structure of EG there are both extended defects formed by the convolution of one or more graphene layers and orientation defects - disclination. The strength characteristics of EG compacted materials can be controlled by changing the parameters of the production process in a limited interval (the ratio of the amount of oxidizing agent, intercalant, with natural dispersed graphite, its particle size). The procedure for treating multiwalled carbon nanotubes (MW CNTs) with a solution of potassium dichromate in sulfuric acid was carried out according to the known technology of oxidation of natural graphite in order to obtain expandable graphite. It provides for the use of sulfuric acid as an intercalating agent and potassium dichromate (K2Cr2O7) as an oxidizing agent. The aqueous dispersion of oxidized MW CNTs is stable over time: the average particle size is 50 nm; two fractions - from 20 to 100 nm, amount - 99.9%, mass - 10%; from 250 to 500 nm and amount of 0.1%, mass - 90%; high polydispersity ranges from 0.35-0.4, that is, the particles are quite close to the spherical shape. Modification of CNTs by oxygen simultaneously with anodic oxidation of natural dispersed graphite allowed for the first time to create a carbon-carbon composite "EG – MW CNTs" with enhanced physical and mechanical characteristics without additional use of binders.}, year = {2019} }
TY - JOUR T1 - Carbon-Carbon Composition “Expanded Graphite – Multiwalled Carbon Nanotubes” AU - Sementsov Yurii AU - Grebel’na Yulia AU - Strelchuk Victor AU - Dovbeshko Galyna AU - Zhuravskyi Serhii AU - Makhno Stanislav AU - Wang Bo AU - Kartel Mykola Y1 - 2019/12/09 PY - 2019 N1 - https://doi.org/10.11648/j.ijmsa.20190806.16 DO - 10.11648/j.ijmsa.20190806.16 T2 - International Journal of Materials Science and Applications JF - International Journal of Materials Science and Applications JO - International Journal of Materials Science and Applications SP - 127 EP - 134 PB - Science Publishing Group SN - 2327-2643 UR - https://doi.org/10.11648/j.ijmsa.20190806.16 AB - It is given the description of expanded graphite (EG) as a cluster-assembled nanoscale system. It is shown that in the structure of EG there are both extended defects formed by the convolution of one or more graphene layers and orientation defects - disclination. The strength characteristics of EG compacted materials can be controlled by changing the parameters of the production process in a limited interval (the ratio of the amount of oxidizing agent, intercalant, with natural dispersed graphite, its particle size). The procedure for treating multiwalled carbon nanotubes (MW CNTs) with a solution of potassium dichromate in sulfuric acid was carried out according to the known technology of oxidation of natural graphite in order to obtain expandable graphite. It provides for the use of sulfuric acid as an intercalating agent and potassium dichromate (K2Cr2O7) as an oxidizing agent. The aqueous dispersion of oxidized MW CNTs is stable over time: the average particle size is 50 nm; two fractions - from 20 to 100 nm, amount - 99.9%, mass - 10%; from 250 to 500 nm and amount of 0.1%, mass - 90%; high polydispersity ranges from 0.35-0.4, that is, the particles are quite close to the spherical shape. Modification of CNTs by oxygen simultaneously with anodic oxidation of natural dispersed graphite allowed for the first time to create a carbon-carbon composite "EG – MW CNTs" with enhanced physical and mechanical characteristics without additional use of binders. VL - 8 IS - 6 ER -