ORCID Profile
0000-0002-1439-7198
Current Organisation
Chongqing University
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Publisher: American Chemical Society (ACS)
Date: 10-12-2020
Publisher: Elsevier BV
Date: 12-2018
Publisher: Springer Science and Business Media LLC
Date: 31-10-2017
DOI: 10.1038/S41598-017-14710-4
Abstract: It is well known the thermal properties of three-dimensional (3-D) hybrid graphene (GR)-carbon nanotube (CNT) structures are not superior to that of the in idual GR and CNT, however, the 3-D hybrid GR-CNT structures can effectively improve the thermal properties of polymer matrix. Therefore, understanding the thermal energy transport in the interface between polymer matrix and 3-D hybrid GR-CNT structure is essential. Here, the enhancement mechanism of interfacial thermal transport of hybrid GR-CNT structure was explored by applying non-equilibrium molecular dynamics (NEMD) simulations. Three different types of hybrid GR-CNT structures were built. The influences of CNT radius and CNT type for the hybrid GR-CNT on the interfacial thermal properties were also analyzed. Computational results show that among the three different types of hybrid GR-CNT structures, the Model-I, i.e., the covalent bond hybrid GR-CNT structures are of the best interfacial thermal properties. Meanwhile, the CNT radius of hybrid GR-CNT structure has a great influence on the interfacial thermal properties.
Publisher: Elsevier BV
Date: 05-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NR10468A
Abstract: Interface topography has great impact on thermal energy transport across the GR/h-BN heterostructure interface.
Publisher: IOP Publishing
Date: 31-07-2023
Abstract: Molecular dynamics simulations have been performed to investigate the interfacial mechanical properties of periodic wrinkled graphene (GR) with polyethylene (PE) matrix. The influences of litude ( H ), wavelength ( λ ), and vacancy defect for the periodic wrinkled GR on the interfacial mechanical properties were considered and the potential mechanisms were analyzed. The results indicate that the interfacial mechanical properties of GR with periodic wrinkles are superior to that of flat GR, especially when the H / λ = 0.51 the interfacial strength enhances ∼29.3%. Through the radial distribution function (RDF) analysis we found that the stronger interfacial mechanical properties are, the more PE molecular chains are attached to the GR when the GR is separated from the PE matrix. In addition, we found that vacancy defect in periodic wrinkled GR does not always degrade the interfacial mechanical properties, and when the vacancy defect content is 20%, the interfacial mechanical properties can be improved, as the vacancy defect reduces the interfacial distance and increases the roughness of the interface.
Publisher: Elsevier BV
Date: 07-2012
Publisher: Informa UK Limited
Date: 06-2014
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 09-2015
Publisher: Springer Science and Business Media LLC
Date: 07-01-2013
Abstract: In this work, the thermal expansion properties of carbon nanotube (CNT)-reinforced nanocomposites with CNT content ranging from 1 to 15 wt% were evaluated using a multi-scale numerical approach, in which the effects of two parameters, i.e., temperature and CNT content, were investigated extensively. For all CNT contents, the obtained results clearly revealed that within a wide low-temperature range (30°C ~ 62°C), thermal contraction is observed, while thermal expansion occurs in a high-temperature range (62°C ~ 120°C). It was found that at any specified CNT content, the thermal expansion properties vary with temperature - as temperature increases, the thermal expansion rate increases linearly. However, at a specified temperature, the absolute value of the thermal expansion rate decreases nonlinearly as the CNT content increases. Moreover, the results provided by the present multi-scale numerical model were in good agreement with those obtained from the corresponding theoretical analyses and experimental measurements in this work, which indicates that this multi-scale numerical approach provides a powerful tool to evaluate the thermal expansion properties of any type of CNT olymer nanocomposites and therefore promotes the understanding on the thermal behaviors of CNT olymer nanocomposites for their applications in temperature sensors, nanoelectronics devices, etc.
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 04-2020
Publisher: MDPI AG
Date: 23-01-2014
DOI: 10.3390/S140201902
Publisher: Elsevier BV
Date: 12-2016
Publisher: IOP Publishing
Date: 12-11-2019
Abstract: Miniaturization and integration of electronic components lead to increasing challenges of thermal management. Ultrathin materials with excellent thermal and flexibility are urgently required for portable electronic devices. In this study, the 1-pyrenemethanol (PyM) modified graphene oxide (GO) (GO-PyM) films were prepared in ethanol solution by an evaporation-induced assembly method. The PyM interacts with the GO sheets by hydrogen bonds and π-π interactions. The GO-PyM films were further graphitized at 3000 °C and roll compressed to fabricate the graphene films (GFs), by which, the PyM was transformed into nanosized graphite crystals (PNGCs). The PNGCs filled the voids between the graphene sheets of GFs and linked the graphene sheets, which enhanced the interaction between the graphene sheets, restricted the slippage of the graphene sheets under tension, increased the number of paths for electrons and phonons, and reduced the interface thermal resistance resulted from the existed voids. The resulting GFs showed excellent flexibility of a large elongation up to 14% and an elastic zone up to 3%, a tensile strength of 30.4 MPa, a thermal conductivity of 1316.32 W m
Publisher: MDPI AG
Date: 10-05-2019
DOI: 10.3390/S19092180
Abstract: A pulse laser combined LWT technique with a two-stage reconstruction algorithm was proposed to realize rapid damage location, or even the evaluation of damage size for plate-like structures. Since the litude of Lamb waves in propagation is highly sensitive to damage, including inside damage, the change of the attenuation coefficient of Lamb waves in the inspection region was used as a damage index to reconstruct damage images. In stage one, the rough area of the damage was identified by a comparison of the litude of the testing signal data and reference data (undamaged state). In stage two, the damage image was reconstructed using an inverse approach based on the least-square method. In order to verify the effectiveness of the proposed rapid approach, experiments on an aluminum plate with a non-penetrating notch and a carbon fiber-reinforced plastic laminated plate with internal delamination induced by a low-velocity impact were carried out. The results show that the notch can be detected with accurate location, and the delamination image can be reconstructed successfully.
Publisher: SAGE Publications
Date: 06-04-2014
Abstract: Piezoelectric energy harvesters can be used to convert ambient energy into electrical energy and power small autonomous devices. In recent years, massive effort has been made to improve the energy harvesting ability in piezoelectric materials. In this study, reduced graphene oxide was added into poly(vinylidene fluoride) to fabricate the piezoelectric nanocomposite films. Open-circuit voltage and electrical power harvesting experiments showed remarkable enhancement in the piezoelectricity of the fabricated poly(vinylidene fluoride)/reduced graphene oxide nanocomposite, especially at an optimal reduced graphene oxide content of 0.05 wt%. Compared to pristine poly(vinylidene fluoride) films, the open-circuit voltage, the density of harvested power of alternating current, and direct current of the poly(vinylidene fluoride)/reduced graphene oxide nanocomposite films increased by 105%, 153%, and 233%, respectively, indicating a great potential for a broad range of applications.
No related grants have been discovered for Huiming Ning.