Article
Chemistry, Physical
J. M. De Sousa, A. L. Aguiar, E. C. Girao, Alexandre F. Fonseca, A. G. Souza Filho, D. S. Galvao
Summary: The newly proposed Penta-graphene membrane exhibits interesting mechanical and electronic properties, including typical band gap values of semiconducting materials. It can withstand up to 20% of strain and shows stress-strain behavior with linear elasticity followed by a plastic regime, involving carbon atom re-hybridization.
Article
Chemistry, Physical
J. M. De Sousa, A. L. Aguiar, E. C. Girao, Alexandre F. Fonseca, V. R. Coluci, D. S. Galvao
Summary: This study investigated the structural stability, mechanical properties, and fracture behavior of penta-graphene nanotubes through computational simulations. The nanotubes exhibited high values of Young's modulus and ultimate tensile stress, showing auxetic behavior. During stretching, the nanotubes underwent a structural transition leading to fracture.
Article
Materials Science, Multidisciplinary
Tongwei Han, Ren Li, Xiaoyan Zhang, Fabrizio Scarpa
Summary: The deformation and fracture mechanisms of penta-graphene are investigated using molecular dynamics simulations with free-standing nanoindentation techniques. The indentation behaviors of penta-graphene under spherical and cylindrical indenters are compared and parametrically analyzed. The results show unusual plastic deformation characteristics originating from pentagon-to-polygon structural transformation. The Young's modulus of penta-graphene is generally unaffected by loading rate, but decreases with increasing temperature under both spherical and cylindrical indenters.
MECHANICS OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
S. Ajori, A. R. Eftekharfar
Summary: Classical molecular dynamics simulations were used to investigate the mechanical properties of defective penta-graphene under uniaxial tension. The results showed that defects can tune the Young's modulus and Poisson's ratio, and the material exhibited weak anisotropic behavior.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Tongwei Han, Jabin Dong, Xueyi Wang, Xiaoyan Zhang, Yikai Lv, Fabrizio Scarpa
Summary: The hydrogenation significantly influences the mechanical properties and failure mechanism of penta-graphene, with low hydrogenation coverage leading to plastic deformation and complete hydrogenation changing the failure mechanism to brittle fracture. The tensile and shear moduli of defective penta-graphene decrease dramatically and then increase slowly with increasing hydrogenation coverage, while tensile and shear strain increases almost monotonically with rising hydrogenation coverage. Complete hydrogenation can result in large enhancement of tensile and shear elastic stress limit and strain.
Article
Nanoscience & Nanotechnology
Tongwei Han, Xueyi Wang, Xiaoyan Zhang, Fabrizio Scarpa, Chun Tang
Summary: This study evaluates the mechanical properties of defective penta-graphene under tensile and shear loading, finding that the elastic constants and nonlinear mechanics are influenced by different defect topologies and concentrations. The tensile and shear moduli decrease linearly with defect concentration, while yielding stresses and strains show smaller reductions.
Article
Physics, Multidisciplinary
Han Tong-Wei, Li Ren, Cao Shu-Min, Zhang Xiao-Yan
Summary: Functionalization can effectively tune the mechanical properties of penta-graphene, with partially functionalized samples still exhibiting plastic deformation failure behavior, while fully functionalized samples show brittle fracture. Temperature can trigger structural reconstruction in partially functionalized penta-graphene.
ACTA PHYSICA SINICA
(2021)
Article
Engineering, Electrical & Electronic
Shambhu Bhandari Sharma, Issam A. Qattan, Meghnath Jaishi, Durga Paudyal
Summary: A new ternary auxetic metallic monolayer, penta-SiCN, is theoretically predicted to have highly tunable negative Poisson's ratio. This monolayer exhibits structural, thermal, dynamic, and mechanical stability, making it experimentally feasible at and beyond room temperature. It also has nontrivial geometrical and mechanical isotropy.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hongcai Xie, Zhichao Ma, Wei Zhang, Hongwei Zhao, Luquan Ren
Summary: In this study, molecular dynamics simulations were used to investigate the dislocation-graphene interactions and strengthening mechanisms in FeNiCrCoCu high-entropy alloy/graphene nanopillars. The results showed that graphene hinders the mobility of dislocations and promotes the formation of immobile dislocations, especially Stair-rod dislocations, leading to a significant strengthening effect. The reduction in dislocation length induced by dislocation reactions and the absorption effect to mobile dislocations also contribute to the formation of more Stair-rod dislocations. Additionally, it was found that reducing the diameter of graphene directly weakens the nanopillars due to the role of graphene edges as dislocation sources.
MATERIALS TODAY PHYSICS
(2022)
Article
Engineering, Mechanical
Shu Sun, Guoliang Ru, Weihong Qi, Weimin Liu
Summary: This study investigates the phenomenon of interlayer robust structural superlubricity in Penta-Graphene van der Waals layered structures through molecular dynamics simulation. The dominance of edge effects in the friction process is demonstrated, and the factors affecting the frictional properties are explored. This work is significant for the exploration of novel structural superlubricity systems and the application of two-dimensional pentagonal materials in the field of nanofriction.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Physical
W. H. S. Brandao, A. L. Aguiar, L. A. Ribeiro, D. S. Galvao, J. M. De Sousa
Summary: Carbon-based tubular materials, specifically nanotubes generated from popgraphene, were computationally studied for their mechanical properties in this research. The results indicated that PopNTs are thermally stable and exhibit different mechanical behaviors based on their chirality. Additionally, the mechanical properties of PopNTs were found to be similar to conventional carbon nanotubes, with Young's modulus values not significantly temperature-dependent.
Article
Chemistry, Physical
Viet Hung Ho, Duc Tam Ho, Won Ho Shin, Sung Youb Kim
Summary: Using molecular statics simulations, the negative Poisson's ratio in different types of penta-graphene is investigated. The combination of bond stretching and angle rotating mechanism determines the Poisson's ratio. The dominance of bond stretching leads to the auxeticity of monolayer penta-graphene, while the angle rotating mechanism enhances the in-plane Poisson's ratio of few-layer penta-graphene. The interlayer bond elongation results in a negative out-of-plane Poisson's ratio. The stacking configuration and number of layers have a strong influence on the Poisson's ratio.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Gang Seob Jung, Stephan Irle, Bobby G. Sumpter
Summary: Graphene, as a two-dimensional carbon material, has attracted much attention due to its mechanical properties and failure mechanism. This study utilizes molecular dynamics simulations with density functional based tight binding to investigate the initiation of failure in pristine graphene. The findings suggest that a single threshold value for bond order or bond length is insufficient to determine the failure of pristine graphene, and instead, the collective behavior of local atomic groups plays a crucial role in fracture initiation.
Article
Chemistry, Physical
Caique C. Oliveira, Matheus Medina, Douglas S. Galvao, Pedro A. S. Autreto
Summary: The discovery of graphene has sparked interest in other 2D carbon-based materials. Researchers have proposed a new carbon allotrope, tetra-penta-deca-hexagonal-graphene (TPDH-graphene), which has unique topology and potential applications. Using DFT and reactive molecular dynamics simulations, we studied the hydrogenation dynamics of TPDH-graphene and its effects on its electronic structure, leading to the formation of well-defined pentagonal carbon stripes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Lujuan Li, Qianqian Cao
Summary: Understanding the physical mechanism of wetting transparency of monolayer graphene and its interaction with droplets is important for scientific and practical applications. This study conducted molecular dynamics simulations to investigate the effects of an applied electric field on the interactions between two droplets separated by graphene. The results showed that molecular interactions can drive the migration of droplets towards each other in the absence of an electric field, indicating the partial wetting transparency of graphene. However, under strong electric fields, the droplet-droplet interactions were suppressed, leading to reduced changes in the number of water molecules and droplet elongation at the graphene/droplet interface. The analysis of microscopic structures revealed that the dipole-dipole interaction through graphene played a significant role in the interactions between droplets.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
W. H. S. Brandao, A. L. Aguiar, L. A. Ribeiro, D. S. Galvao, J. M. De Sousa
Summary: Carbon-based tubular materials, specifically nanotubes generated from popgraphene, were computationally studied for their mechanical properties in this research. The results indicated that PopNTs are thermally stable and exhibit different mechanical behaviors based on their chirality. Additionally, the mechanical properties of PopNTs were found to be similar to conventional carbon nanotubes, with Young's modulus values not significantly temperature-dependent.
Article
Chemistry, Physical
R. S. Alencar, A. L. Aguiar, R. S. Ferreira, R. Chambard, B. Jousselme, J. -L. Bantignies, C. Weigel, S. Clement, R. Aznar, D. Machon, A. G. Souza Filho, A. San-Miguel, L. Alvarez
Summary: Filling carbon nanotubes with molecules is a promising approach for developing electronically modified one-dimensional hybrid structures by tuning energy levels with external parameters. Quaterthiophene molecules confined in single-walled carbon nanotubes exhibit piezo-Raman-resonance behavior, with pressure-induced enhancement of vibrational patterns. The pressure-induced nanotube radial collapse leads to an increase in resonance channels, explaining the observed piezo-resonance scenario.
Article
Chemistry, Physical
J. M. De Sousa, A. L. Aguiar, E. C. Girao, Alexandre F. Fonseca, A. G. Souza Filho, D. S. Galvao
Summary: The newly proposed Penta-graphene membrane exhibits interesting mechanical and electronic properties, including typical band gap values of semiconducting materials. It can withstand up to 20% of strain and shows stress-strain behavior with linear elasticity followed by a plastic regime, involving carbon atom re-hybridization.
Article
Chemistry, Physical
J. M. De Sousa, A. L. Aguiar, E. C. Girao, Alexandre F. Fonseca, V. R. Coluci, D. S. Galvao
Summary: This study investigated the structural stability, mechanical properties, and fracture behavior of penta-graphene nanotubes through computational simulations. The nanotubes exhibited high values of Young's modulus and ultimate tensile stress, showing auxetic behavior. During stretching, the nanotubes underwent a structural transition leading to fracture.
Article
Chemistry, Physical
W. H. S. Brandao, A. L. Aguiar, L. A. Ribeiro Junior, D. S. Galvao, J. M. De Sousa
Summary: This study investigates the elastic properties and fracture patterns of a new 2D carbon allotrope called Pentahexoctite through computational simulations. The results show that Pentahexoctite has a lower Young's Modulus compared to graphene and undergoes complete fracture when subjected to critical strain. The study also reveals a similar fracture process in graphene.
Article
Materials Science, Multidisciplinary
Wjefferson H. S. Brandao, Acrisio L. Aguiar, Alexandre F. Fonseca, D. S. Galvao, J. M. De Sousa
Summary: This study investigated the mechanical properties of the quasi-2D semiconductor carbon allotrope tetragraphene under different temperatures through fully atomistic reactive molecular dynamics simulations. The results showed that tetragraphene undergoes a transition from crystalline to amorphous structure induced by temperature and/or tension. Compared to graphene and penta-graphene, tetragraphene has higher critical strains but smaller elastic modulus and ultimate tensile strength values.
MECHANICS OF MATERIALS
(2023)
Article
Physics, Condensed Matter
J. M. De Sousa, L. D. Machado, C. F. Woellner, M. Medina, P. A. S. Autreto, D. S. Galvao
Summary: The mechanical response and fracture dynamics of BNNT-peapods under ultrasonic velocity impacts were investigated. Reactive molecular dynamics simulations were carried out, considering horizontal and vertical shootings. Tube bending, tube fracture, and C-60 ejection were observed depending on the velocity values, with the nanotube unzipping for horizontal impacts at certain speeds.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Marcelo L. Pereira Junior, Jose. M. De Sousa, Wjefferson H. S. Brandao, Douglas. S. Galvao, Alexandre F. Fonseca, Luiz A. Ribeiro Junior
Summary: This study investigated the mechanical properties and fracture patterns of Me-graphene (MeG) using molecular dynamics simulations. The results showed that the Young's modulus of MeG monolayers is about 414 GPa, while the range is 421-483 GPa for MeG nanotubes. Both MeG monolayers and MeG nanotubes undergo elastic to complete fracture under critical strain without a plastic regime.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
W. H. S. Brandao, J. M. De Sousa, A. L. Aguiar, D. S. Galvao, Luiz A. Ribeiro, Alexandre F. Fonseca
Summary: Pentahexoctite (PH) is a sp2 hybridized planar carbon allotrope composed of pentagons, hexagons, and octagons. It exhibits metallic properties and good mechanical and thermal stability. In this study, we used reactive molecular dynamics (ReaxFF) and density functional theory (DFT) methods to investigate the elastic properties and fracture patterns of PH nanotubes (PHNTs).
MECHANICS OF MATERIALS
(2023)
Correction
Chemistry, Physical
Chen Luo, Yan Shao, Hua Yu, Hong-zhi Ma, Yu-hao Zhang, Long Gu, Bo Yin, Ming-bo Yang
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Stefano Borocci, Armando Camerlingo, Felice Grandinetti, Maria Rutigliano, Nico Sanna
Summary: The complexes of He, Ne, Ar, Kr, and Xe with B3N3H6 were investigated using MP2, CCSD(T), and SAPT ab initio methods. The complexes can be described as mono-, di-, and tri-coordinated to the N atoms, with stability following the order N-mono < N-di < N-tri. The interactions are dominated by dispersion and the binding energies are within the range of 1 or 2 kcal mol(-1). The results were compared with a recent DFT study on larger BN sheets complexes [Phys. Chem. Chem. Phys. 24 (2022) 2554-2566.].
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
V. Nagarajan, R. Bhuvaneswari, R. Chandiramouli
Summary: In this study, stable phosphoborane was used as a sensor to detect isobutane and n-propane in Liquefied Petroleum Gas (LPG). Phosphoborane demonstrated structural stability and semiconducting nature, and exhibited promising adsorption properties for the LPG molecules.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Xiaoxi Xu, Zijiang Yang, Bayaer Buren, Maodu Chen
Summary: In this study, the time-dependent wave packet method was used to investigate the reaction channels and mechanisms of Ca+ + HD. The results show that the CaH+ + D reaction channel plays a primary role, which is consistent with experimental results. Complex forming and direct-abstraction reaction mechanisms exist in this reaction process.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Keshab Pandey, Hae Kyung Jeong
Summary: A free-standing silicon-carbon nanofiber composite film was synthesized and investigated for supercapacitor applications. It exhibited high specific capacitance, energy density, and power density. After 5000 cycles, the film showed excellent specific capacitance retention and Coulombic efficiency.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Xinyu Zhang, Haosong Li, Xiaoyu Cao, Jing Gao, Yong Wei, Jianzhuo Zhu
Summary: The evaporation behavior of nanosized water aggregations on two-dimensional electroneutral solid surfaces with different surface polar unit densities was investigated. The results showed that the evaporation rate changes non-monotonically with the surface polar unit density, and the minimum evaporation rate is obtained when the surface has a modest surface polar unit ratio of 66.7%.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Yanyan Xu, Rui Dai, Xiaojie Wang, Zhijun Qiao, Haowei Wen, Dianbo Ruan, Yuzuo Wang
Summary: This article presents an innovative solvothermal sodium insertion method for synthesizing Triphylite-NaFePO4, which demonstrates optimal electrochemical performance in sodium-ion batteries.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Meiyi Jiang, Kun Yang, Yancheng Liu, Li Yao
Summary: The geometric structure and electronic properties of transition metal M (M = Cu, Fe, Mn)-TiO2 (101) surface adsorbed by NO2 and N2O were calculated by density functional theory (DFT) and DFT + U theory. The results showed that the adsorption of NO2 and N2O on Mn and Fe atoms is more stable, and a large number of active electrons are formed around these atoms, facilitating the catalytic reactions.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Sergey A. Vyrko, Yulia G. Polynskaya, Nikita A. Matsokin, Andrey M. Popov, Andrey A. Knizhnik, Nikolai A. Poklonski, Yurii E. Lozovik
Summary: In this study, carbon nanobracelets, which are cyclic molecules composed of alternating polycyclic regions and double carbon chains, were investigated using spin-polarized density functional theory. The results show that carbon nanobracelets with odd number of monomers exhibit distinct electronic energy levels, band gaps, and carbon chain deformation compared to those with even number of monomers.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Chanchan Wang, Quan Yang, Yanzhi Ding, Xiaoyong Lu, Dong Tian
Summary: It has been found that the introduction of buffer layers improves the electrical performance of solid oxide fuel cells (SSOFCs). In this study, varying ratios of Gd-doped CeO2 were used as buffer layers in YSZ-based SSOFCs. The results demonstrate that the performance of SSOFCs is enhanced when a buffer layer is added, with the highest performance achieved using Ce0.8Gd0.2O2-delta (GDC20) as the buffer layer. This suggests that the use of GDC series buffer layers is an attractive strategy to optimize performance loss due to electrolyte-electrode interactions.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Wang Li, Yi-Fan Zhang, Jia-Bin Huang, Chang-Yang Wang, Feng Zhang, Jiu-Zhong Yang, Long Zhao
Summary: The gas-phase reaction of propargyl with vinylacetylene was investigated using synchrotron photoionization and molecular-beam mass spectrometry methodologies. The formation mechanisms of the resulting cyclic structures were examined using quantum computations. Two previously unidentified isomers were detected and identified for the first time.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Avijit Pramanik, Sanchita Kundu, Olorunsola Praise Kolawole, Kaelin Gates, Paresh Chandra Ray
Summary: This study investigates the influence of aspect ratio and quantum confinement on the single-photon and two-photon absorption cross-section of perovskite CsPbI3 nanorods. Experimental data shows that CsPbI3 nanorods have an extremely high two-photon absorption cross-section, significantly surpassing organic chromophores and other CsPbBr3 nanocrystals. Moreover, adjusting the aspect ratio can significantly enhance the absorption ability. Additionally, the study also reveals a moderate quantum confinement effect on the single-photon and two-photon absorption cross-section of the nanorods.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Hyon-Tae Pak, Jin-A Choe, Kyong-Sik Ju, Yong -Son Rim
Summary: Drug-loaded cellulose diacetate (CDA) membranes were prepared using different compositions of mixed solvent. The microstructure and performance of the membranes were investigated, and a method to predict drug release properties was proposed. The results showed that the composition of the mixed solvent significantly affected the overall performance of CDA membranes, and the release rates of drugs were related to Δdelta and the intrinsic viscosity of CDA.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Gabriella E. Ravin, E. Curotto
Summary: We have developed a systematic approach to optimize the training set sizes for neural networks in fitting ab initio potential energy surfaces. Using this approach, we have constructed several spectroscopic quality potential energy surfaces for [Li(H2)n]+, n = 1 - 9. The ground state properties have been computed for all the systems and selected states.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Guohua Xu, Lei Xu, Feng Zhang, Chunling Yu, Yu Song
Summary: NiS1.03@Ni7S6/carbon composite was successfully prepared using corn stalk as a carbon source via a simple adsorption-sulphurization process. The composite exhibited a specific capacitance of 1554.6 F/g at 1 A/g as a supercapacitor electrode, with a capacitance retention rate of 80.4% after 5000 cycles. Furthermore, the NiS1.03@Ni7S6/carbon//AC asymmetric supercapacitor showed a high energy density of 41.2 Wh kg-1 at a power density of 750 W kg-1, and excellent cycling stability with 86.8% capacitance retention after 10,000 cycles.
CHEMICAL PHYSICS LETTERS
(2024)