DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effect of Methyl Groups on Formation of Ordered or Layered Graphitic Materials from Aromatic Molecules

Journal Article · · Small

Abstract Developing functionally complex carbon materials from small aromatic molecules requires an understanding of how the chemistry and structure of its constituent molecules evolve and crosslink, to achieve a tailorable set of functional properties. Here, molecular dynamics (MD) simulations are used to isolate the effect of methyl groups on condensation reactions during the oxidative process and evaluate the impact on elastic modulus by considering three monodisperse pyrene‐based systems with increasing methyl group fraction. A parameter to quantify the reaction progression is designed by computing the number of new covalent bonds formed. Utilizing the previously developed MD framework, it is found that increasing methylation leads to an almost doubling of bond formation, a larger fraction of the new bonds oriented in the direction of tensile stress, and a higher basal plane alignment of the precursor molecules along the direction of tensile stress, resulting in enhanced tensile modulus. Additionally, via experiments, it is demonstrated that precursors with a higher fraction of methyl groups result in a higher alignment of molecules. Moreover, increased methylation results in the lower spread of single molecule alignment which may lead to smaller variations in tensile modulus and more consistent properties in carbon materials derived from methyl‐rich precursors.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1986354
Journal Information:
Small, Journal Name: Small Journal Issue: 43 Vol. 19; ISSN 1613-6810
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

References (63)

Natural Carbon By‐Products for Transparent Heaters: The Case of Steam‐Cracker Tar journal July 2019
PACKMOL: A package for building initial configurations for molecular dynamics simulations journal October 2009
Graphene Oxide, Highly Reduced Graphene Oxide, and Graphene: Versatile Building Blocks for Carbon-Based Materials journal March 2010
Mesoscopic Structure and Properties of Liquid Crystalline Mesophase Pitch and Its Transformation into Carbon Fiber journal March 2002
Graphite Fibers and Composites book January 1982
A structural study on the stabilization and enhancement of mesophase pitch fibre journal January 1990
Chemical changes during the mild air oxidation of pitch journal January 1978
The electronic and structural characteristics of carbon fibers from mesophase pitch journal January 1979
Most stable configurations of polynuclear aromatic hydrocarbon molecules in pitches via molecular modelling journal January 1992
A structural study on oxidative stabilization of mesophase pitch fibers derived from coaltar journal January 1992
Effects of reductively introduced alkyl groups and hydrogen to mesophase pitch on carbonization properties journal January 1993
Preparation of isotropic pitch precursors for general purpose carbon fibers (GPCF) by air blowing—II. Air blowing of coal tar, hydrogenated coal tar, and petroleum pitches journal January 1993
Reorganization of molecular alignment in naphthalene and methyl-naphthalene derived pitches journal January 1994
The flow properties of mesophase pitches derived from methylnaphthalene and naphthalene in the temperature range of their spinning journal January 1994
The oxidative stabilization and carbonization of a synthetic mesophase pitch, part I: The oxidative stabilization process journal January 1995
The oxidative stabilization and carbonization of a synthetic mesophase pitch, part II: The carbonization process journal January 1995
VMD: Visual molecular dynamics journal February 1996
Relationships between pitch composition and optical texture of cokes journal January 1997
Effect of Methylation on Local Mechanics and Hydration Structure of DNA journal April 2018
Observations on a low-angle X-ray diffraction peak for AR-HP mesophase pitch journal July 2008
A comparison of the effect of graphitization on microstructures and properties of polyacrylonitrile and mesophase pitch-based carbon fibers journal October 2012
Carbon fibers from dry-spinning of acetylated softwood kraft lignin journal April 2014
The thermotropic liquid crystalline behavior of mesophase pitches with different chemical structures journal January 2015
Molecular characterization of large polycyclic aromatic hydrocarbons in solid petroleum pitch and coal tar pitch by high resolution MALDI ToF MS and insights from ion mobility separation journal December 2015
Enhancing the tensile strength of isotropic pitch-based carbon fibers by improving the stabilization and carbonization properties of precursor pitch journal April 2016
Analysis of thermally induced changes in the structure of coal tar pitches by an advanced evaluation method of X-ray scattering data journal November 2016
Analyses of oxidation process for isotropic pitch-based carbon fibers using model compounds journal February 2019
Fabrication of low-cost carbon fibers using economical precursors and advanced processing technologies journal February 2019
Generation and characterization of carbon fiber microstructures by atomistic simulations journal November 2019
Structural evolutions of small aromatic mixtures under extreme temperature conditions: Insights from ReaxFF molecular dynamics investigations journal December 2019
Preparation and characterization of high-spinnability isotropic pitch from 1-methylnaphthalene-extracted low-rank coal by co-carbonization with petroleum residue journal December 2019
Manufacturing spinnable mesophase pitch using direct coal extracted fraction and its derived mesophase pitch based carbon fiber journal March 2020
Predicting cost-effective carbon fiber precursors: Unraveling the functionalities of oxygen and nitrogen-containing groups during carbonization from ReaxFF simulations journal April 2020
Petroleum pitch: Exploring a 50-year structure puzzle with real-space molecular imaging journal May 2020
Adverse effect of mesophase pitch draw-down ratio on carbon fiber strength journal October 2020
Generation and characterization of an improved carbon fiber model by molecular dynamics journal March 2021
Carbon fiber synthesis from pitch: Insights from ReaxFF based molecular dynamics simulations journal May 2021
Correlation between molecular stacking and anisotropic texture in spinnable mesophase pitch journal June 2022
Processing, structure, and properties of carbon fibers journal December 2016
Mechanism of sp3 bond formation in the growth of diamond-like carbon journal March 2005
Insight into the oxidative reactivity of pitch fractions for predicting and optimizing the oxidation stabilization of pitch journal April 2019
Preparation of mesocarbon microbeads as anode material for lithium-ion battery by co‑carbonization of FCC decant oil and conductive carbon black journal March 2022
Evaluating the stabilization of isotropic pitch fibers for optimal tensile properties of carbon fibers journal January 2017
A review of shape memory alloy research, applications and opportunities journal April 2014
Parallel reactive molecular dynamics: Numerical methods and algorithmic techniques journal April 2012
The Role of Methyl Groups in the Early Stage of Thermal Polymerization of Polycyclic Aromatic Hydrocarbons Revealed by Molecular Imaging journal January 2021
Ex Situ and In Situ Thermal Transformations of M-50 Pitch Revealed by Non-contact Atomic Force Microscopy journal September 2021
Unexpected Structural Effects on the Onset of Thermal Reactions of Aromatic Hydrocarbons journal April 2023
Atomistic Scale Analysis of the Carbonization Process for C/H/O/N-Based Polymers with the ReaxFF Reactive Force Field journal May 2019
Highly Conductive and Permeable Nanocomposite Ultrafiltration Membranes Using Laser-Reduced Graphene Oxide journal March 2021
Constructing the Bridge from Isotropic to Anisotropic Pitches for Preparing Pitch-Based Carbon Fibers with Tunable Structures and Properties journal August 2020
Effect of Liquid Crystalline Texture of Mesophase Pitches on the Structure and Property of Large-Diameter Carbon Fibers journal January 2019
Effects of Air-Blowing on the Molecular Size and Structure of Coal-Tar Pitch Components journal October 2002
Carbonization in Polyacrylonitrile (PAN) Based Carbon Fibers Studied by ReaxFF Molecular Dynamics Simulations journal April 2012
Review Carbon fibers for composites journal January 2000
A unified formulation of the constant temperature molecular dynamics methods journal July 1984
Molecular modeling of the microstructure evolution during carbon fiber processing journal December 2017
On the role of steric clashes in methylation control of restriction endonuclease activity journal December 2015
Canonical dynamics: Equilibrium phase-space distributions journal March 1985
Compressed glassy carbon: An ultrastrong and elastic interpenetrating graphene network journal June 2017
Laser-engineered heavy hydrocarbons: Old materials with new opportunities journal April 2020
Atoms to fibers: Identifying novel processing methods in the synthesis of pitch-based carbon fibers journal March 2022
The effect of the spinning conditions on the structure of mesophase pitch-based carbon fibers by Taguchi method journal July 2016