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Synthesis of graphene derivatives from asphaltenes and effect of carbonization temperature on their structural parameters

A method for synthesizing graphene derivatives from asphaltene is proposed in this work. The graphene derivatives are mainly composed of few-layer graphene-like nano-sheets of randomly distributed heteroatoms; mainly sulfur and nitrogen. The proposed method is based on a thermal treatment in which a...

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Autores principales: AlHumaidan, Faisal S., Rana, Mohan S., Vinoba, Mari, AlSheeha, Hanadi M., Ali, Afnan A., Navvamani, R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9993227/
https://www.ncbi.nlm.nih.gov/pubmed/36909755
http://dx.doi.org/10.1039/d2ra07481h
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author AlHumaidan, Faisal S.
Rana, Mohan S.
Vinoba, Mari
AlSheeha, Hanadi M.
Ali, Afnan A.
Navvamani, R.
author_facet AlHumaidan, Faisal S.
Rana, Mohan S.
Vinoba, Mari
AlSheeha, Hanadi M.
Ali, Afnan A.
Navvamani, R.
author_sort AlHumaidan, Faisal S.
collection PubMed
description A method for synthesizing graphene derivatives from asphaltene is proposed in this work. The graphene derivatives are mainly composed of few-layer graphene-like nano-sheets of randomly distributed heteroatoms; mainly sulfur and nitrogen. The proposed method is based on a thermal treatment in which asphaltene is carbonized in a rotating quartz-tube furnace under an inert atmosphere at a temperature in the range of 400–950 °C. Asphaltenes from different origins were employed to verify the synthesis method. The results indicate that graphene derivatives obtained at high carbonization temperature have similar structural parameters, despite the evident differences in parent asphaltenes structures and compositions. The transformation of asphaltene to graphene derivatives mainly occurred due to three factors: the reduction in the average number of aromatic layers (n), the expansion in aromatic sheet diameter (L(a)), and the elimination of alkyl side chains. The reduction in the number of aromatic sheets per stack is primarily ascribed to thermal exfoliation, while the increase in the aromatic sheet diameter is attributed to secondary reactions in the aromatic core of asphaltene. The elimination of side chains, on the other hand, is mainly credited to thermal cracking. The quantification of defect density (L(D)) in the graphene derivatives suggests an association between defects and heteroatoms presence.
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spelling pubmed-99932272023-03-09 Synthesis of graphene derivatives from asphaltenes and effect of carbonization temperature on their structural parameters AlHumaidan, Faisal S. Rana, Mohan S. Vinoba, Mari AlSheeha, Hanadi M. Ali, Afnan A. Navvamani, R. RSC Adv Chemistry A method for synthesizing graphene derivatives from asphaltene is proposed in this work. The graphene derivatives are mainly composed of few-layer graphene-like nano-sheets of randomly distributed heteroatoms; mainly sulfur and nitrogen. The proposed method is based on a thermal treatment in which asphaltene is carbonized in a rotating quartz-tube furnace under an inert atmosphere at a temperature in the range of 400–950 °C. Asphaltenes from different origins were employed to verify the synthesis method. The results indicate that graphene derivatives obtained at high carbonization temperature have similar structural parameters, despite the evident differences in parent asphaltenes structures and compositions. The transformation of asphaltene to graphene derivatives mainly occurred due to three factors: the reduction in the average number of aromatic layers (n), the expansion in aromatic sheet diameter (L(a)), and the elimination of alkyl side chains. The reduction in the number of aromatic sheets per stack is primarily ascribed to thermal exfoliation, while the increase in the aromatic sheet diameter is attributed to secondary reactions in the aromatic core of asphaltene. The elimination of side chains, on the other hand, is mainly credited to thermal cracking. The quantification of defect density (L(D)) in the graphene derivatives suggests an association between defects and heteroatoms presence. The Royal Society of Chemistry 2023-03-08 /pmc/articles/PMC9993227/ /pubmed/36909755 http://dx.doi.org/10.1039/d2ra07481h Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
AlHumaidan, Faisal S.
Rana, Mohan S.
Vinoba, Mari
AlSheeha, Hanadi M.
Ali, Afnan A.
Navvamani, R.
Synthesis of graphene derivatives from asphaltenes and effect of carbonization temperature on their structural parameters
title Synthesis of graphene derivatives from asphaltenes and effect of carbonization temperature on their structural parameters
title_full Synthesis of graphene derivatives from asphaltenes and effect of carbonization temperature on their structural parameters
title_fullStr Synthesis of graphene derivatives from asphaltenes and effect of carbonization temperature on their structural parameters
title_full_unstemmed Synthesis of graphene derivatives from asphaltenes and effect of carbonization temperature on their structural parameters
title_short Synthesis of graphene derivatives from asphaltenes and effect of carbonization temperature on their structural parameters
title_sort synthesis of graphene derivatives from asphaltenes and effect of carbonization temperature on their structural parameters
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9993227/
https://www.ncbi.nlm.nih.gov/pubmed/36909755
http://dx.doi.org/10.1039/d2ra07481h
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