The Experts below are selected from a list of 336 Experts worldwide ranked by ideXlab platform

Zhongjiang Feng - One of the best experts on this subject based on the ideXlab platform.

  • Facile fabrication of multi-walled carbon nanotubes and its enhancement on Thermally Conductive Adhesive applied in heat dissipation devices
    Materials & Design, 2013
    Co-Authors: Junxia Wang, Shilin Yan, Rui Bao, Kelun Yang, Zhongjiang Feng
    Abstract:

    Abstract A facile synthetic scheme of amine-grafted multi-walled carbon nanotubes (MWCNTs) using silane coupling agent has been illustrated, which has not been reported in literature. The fabricated MWCNTs were characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and field emission scanning electron micrograph (FESEM). The results indicate that the amine groups have been grafted onto the surface of MWCNTs and symmetry of MWCNTs was not destroyed, simultaneously, they generated such large polar forces among nanotubes that they formed close-packed structure. Also, they were well dispersed in resin matrix and their distribution was relatively homogenous because there was less nanotubes pulled out on the fracture surface. The thermal analysis was taken for investigation of the thermal stability and thermal decomposition behavior. The comparative analysis proved the existence of amine groups and its total weight of 11 wt.%. The efficient interaction between amine grafted MWCNTs enhanced the crosslink density and the values of glass transition temperature which confirmed the efficient compatibility with resin matrix.

Junxia Wang - One of the best experts on this subject based on the ideXlab platform.

  • Material Based Structure Design: Numerical Analysis Thermodynamic Response of Thermal Pyrolytic Graphite /Al Sandwich Composites
    Applied Composite Materials, 2016
    Co-Authors: Junxia Wang, Shilin Yan
    Abstract:

    Amine-grafted multiwalled carbon nanotubes (MWCNTs) based Thermally Conductive Adhesive (TCA) was studied in the previous paper and applied here in thermal pyrolytic graphite (TPG)/Al radiator due to its high thermal conductivity, toughness and cohesiveness. In this paper, in an attempt to confirm the application of TCA to TPG/Al sandwich radiator, the thermodynamic response in TPG/Al sandwich composites associated with key material properties and structural design was investigated using finite element simulation with commercial available ANSYS software. The induced thermal stress in TCA layer is substantial due to the thermal expansion mismatch between Al plate and TPG. The maximum thermal stress is located near the edge of TCA layer with the von Mises stress value of 4.02 MPa and the shear stress value of 1.66 MPa. The reasonable adjustment of physical-mechanical properties including thermal conductivity, thermal expansion, Young,s modulus and the thickness of TCA layer, Al plate and TPG are beneficial for reducing the temperature of the top surface of the upper skin and their effects on the reduction of thermal structural response in some ways. These findings will highlight the structural optimization of TPG/Al radiator for future application.

  • Morphology and cure behavior of multi-walled carbon nanotubes-based Thermally Conductive Adhesive
    Journal of Wuhan University of Technology-Mater. Sci. Ed., 2014
    Co-Authors: Junxia Wang, Shilin Yan, Fei Yan, Beiping Xie
    Abstract:

    We evaluated the cure behavior of multi-walled carbon nanotubes (MWCNTs) based Thermally Conductive Adhesive by comprehensively thermal analysis, which presented extremely complicated variability of conversion ratio α as a function of temperature with synergistic action of positive effect and negative volumeblocking effect of MWCNTs and cross-linked network of cured polymer molecules. Due to the decomposition of MWCNTs and degradation of polymer, the mass drop is dramatically obvious over the temperature range of 330–370 °C. Binary resins filled with acid -treated MWCNTs present similar reaction interval as neat epoxy and matrix resins, which is distinct from the material filled with raw MWCNTs. The alteration of the crystalline temperature and cure temperature of resins is attributed to heterogeneous nucleation of MWCNTs in matrix resins. The -COOH group of acid-treated MWCNTs reacts with epoxy groups and thus generates cross-linking, accelerates the reaction rate and reduces the cure temperature.

  • Dynamic analysis and mechanical behavior of Thermally Conductive Adhesive reinforced with amine-grafted multiwalled carbon nanotubes
    Polymer Composites, 2013
    Co-Authors: Junxia Wang, Shilin Yan, Beiping Xie, Rui Bao
    Abstract:

    The kinetics parameters of activation energy and the pre-exponential factor can be calculated based on the kinetics equation and integral method. The stress–strain curves of filled materials exhibit considerable nonlinearity and nonobvious yield point, which is in contrast with that of neat epoxy and matrix resins. The neat epoxy mixing with MWCNTs gets an improvement on the toughness and cohesiveness of epoxy system. The micrograph of neat epoxy exhibits the typical smooth and brilliant surface belongs to brittle materials. The fracture process is originated from a small area in the cross-section. Nevertheless, the fracture surface of filled materials show differential fractographical feature and rougher surface with the MWCNTs added to the epoxy matrix. POLYM. COMPOS., 35:964–968, 2014. © 2013 Society of Plastics Engineers

  • Facile fabrication of multi-walled carbon nanotubes and its enhancement on Thermally Conductive Adhesive applied in heat dissipation devices
    Materials & Design, 2013
    Co-Authors: Junxia Wang, Shilin Yan, Rui Bao, Kelun Yang, Zhongjiang Feng
    Abstract:

    Abstract A facile synthetic scheme of amine-grafted multi-walled carbon nanotubes (MWCNTs) using silane coupling agent has been illustrated, which has not been reported in literature. The fabricated MWCNTs were characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and field emission scanning electron micrograph (FESEM). The results indicate that the amine groups have been grafted onto the surface of MWCNTs and symmetry of MWCNTs was not destroyed, simultaneously, they generated such large polar forces among nanotubes that they formed close-packed structure. Also, they were well dispersed in resin matrix and their distribution was relatively homogenous because there was less nanotubes pulled out on the fracture surface. The thermal analysis was taken for investigation of the thermal stability and thermal decomposition behavior. The comparative analysis proved the existence of amine groups and its total weight of 11 wt.%. The efficient interaction between amine grafted MWCNTs enhanced the crosslink density and the values of glass transition temperature which confirmed the efficient compatibility with resin matrix.

Shilin Yan - One of the best experts on this subject based on the ideXlab platform.

  • Material Based Structure Design: Numerical Analysis Thermodynamic Response of Thermal Pyrolytic Graphite /Al Sandwich Composites
    Applied Composite Materials, 2016
    Co-Authors: Junxia Wang, Shilin Yan
    Abstract:

    Amine-grafted multiwalled carbon nanotubes (MWCNTs) based Thermally Conductive Adhesive (TCA) was studied in the previous paper and applied here in thermal pyrolytic graphite (TPG)/Al radiator due to its high thermal conductivity, toughness and cohesiveness. In this paper, in an attempt to confirm the application of TCA to TPG/Al sandwich radiator, the thermodynamic response in TPG/Al sandwich composites associated with key material properties and structural design was investigated using finite element simulation with commercial available ANSYS software. The induced thermal stress in TCA layer is substantial due to the thermal expansion mismatch between Al plate and TPG. The maximum thermal stress is located near the edge of TCA layer with the von Mises stress value of 4.02 MPa and the shear stress value of 1.66 MPa. The reasonable adjustment of physical-mechanical properties including thermal conductivity, thermal expansion, Young,s modulus and the thickness of TCA layer, Al plate and TPG are beneficial for reducing the temperature of the top surface of the upper skin and their effects on the reduction of thermal structural response in some ways. These findings will highlight the structural optimization of TPG/Al radiator for future application.

  • Morphology and cure behavior of multi-walled carbon nanotubes-based Thermally Conductive Adhesive
    Journal of Wuhan University of Technology-Mater. Sci. Ed., 2014
    Co-Authors: Junxia Wang, Shilin Yan, Fei Yan, Beiping Xie
    Abstract:

    We evaluated the cure behavior of multi-walled carbon nanotubes (MWCNTs) based Thermally Conductive Adhesive by comprehensively thermal analysis, which presented extremely complicated variability of conversion ratio α as a function of temperature with synergistic action of positive effect and negative volumeblocking effect of MWCNTs and cross-linked network of cured polymer molecules. Due to the decomposition of MWCNTs and degradation of polymer, the mass drop is dramatically obvious over the temperature range of 330–370 °C. Binary resins filled with acid -treated MWCNTs present similar reaction interval as neat epoxy and matrix resins, which is distinct from the material filled with raw MWCNTs. The alteration of the crystalline temperature and cure temperature of resins is attributed to heterogeneous nucleation of MWCNTs in matrix resins. The -COOH group of acid-treated MWCNTs reacts with epoxy groups and thus generates cross-linking, accelerates the reaction rate and reduces the cure temperature.

  • Dynamic analysis and mechanical behavior of Thermally Conductive Adhesive reinforced with amine-grafted multiwalled carbon nanotubes
    Polymer Composites, 2013
    Co-Authors: Junxia Wang, Shilin Yan, Beiping Xie, Rui Bao
    Abstract:

    The kinetics parameters of activation energy and the pre-exponential factor can be calculated based on the kinetics equation and integral method. The stress–strain curves of filled materials exhibit considerable nonlinearity and nonobvious yield point, which is in contrast with that of neat epoxy and matrix resins. The neat epoxy mixing with MWCNTs gets an improvement on the toughness and cohesiveness of epoxy system. The micrograph of neat epoxy exhibits the typical smooth and brilliant surface belongs to brittle materials. The fracture process is originated from a small area in the cross-section. Nevertheless, the fracture surface of filled materials show differential fractographical feature and rougher surface with the MWCNTs added to the epoxy matrix. POLYM. COMPOS., 35:964–968, 2014. © 2013 Society of Plastics Engineers

  • Facile fabrication of multi-walled carbon nanotubes and its enhancement on Thermally Conductive Adhesive applied in heat dissipation devices
    Materials & Design, 2013
    Co-Authors: Junxia Wang, Shilin Yan, Rui Bao, Kelun Yang, Zhongjiang Feng
    Abstract:

    Abstract A facile synthetic scheme of amine-grafted multi-walled carbon nanotubes (MWCNTs) using silane coupling agent has been illustrated, which has not been reported in literature. The fabricated MWCNTs were characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and field emission scanning electron micrograph (FESEM). The results indicate that the amine groups have been grafted onto the surface of MWCNTs and symmetry of MWCNTs was not destroyed, simultaneously, they generated such large polar forces among nanotubes that they formed close-packed structure. Also, they were well dispersed in resin matrix and their distribution was relatively homogenous because there was less nanotubes pulled out on the fracture surface. The thermal analysis was taken for investigation of the thermal stability and thermal decomposition behavior. The comparative analysis proved the existence of amine groups and its total weight of 11 wt.%. The efficient interaction between amine grafted MWCNTs enhanced the crosslink density and the values of glass transition temperature which confirmed the efficient compatibility with resin matrix.

Kelun Yang - One of the best experts on this subject based on the ideXlab platform.

  • Facile fabrication of multi-walled carbon nanotubes and its enhancement on Thermally Conductive Adhesive applied in heat dissipation devices
    Materials & Design, 2013
    Co-Authors: Junxia Wang, Shilin Yan, Rui Bao, Kelun Yang, Zhongjiang Feng
    Abstract:

    Abstract A facile synthetic scheme of amine-grafted multi-walled carbon nanotubes (MWCNTs) using silane coupling agent has been illustrated, which has not been reported in literature. The fabricated MWCNTs were characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and field emission scanning electron micrograph (FESEM). The results indicate that the amine groups have been grafted onto the surface of MWCNTs and symmetry of MWCNTs was not destroyed, simultaneously, they generated such large polar forces among nanotubes that they formed close-packed structure. Also, they were well dispersed in resin matrix and their distribution was relatively homogenous because there was less nanotubes pulled out on the fracture surface. The thermal analysis was taken for investigation of the thermal stability and thermal decomposition behavior. The comparative analysis proved the existence of amine groups and its total weight of 11 wt.%. The efficient interaction between amine grafted MWCNTs enhanced the crosslink density and the values of glass transition temperature which confirmed the efficient compatibility with resin matrix.

Rui Bao - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic analysis and mechanical behavior of Thermally Conductive Adhesive reinforced with amine-grafted multiwalled carbon nanotubes
    Polymer Composites, 2013
    Co-Authors: Junxia Wang, Shilin Yan, Beiping Xie, Rui Bao
    Abstract:

    The kinetics parameters of activation energy and the pre-exponential factor can be calculated based on the kinetics equation and integral method. The stress–strain curves of filled materials exhibit considerable nonlinearity and nonobvious yield point, which is in contrast with that of neat epoxy and matrix resins. The neat epoxy mixing with MWCNTs gets an improvement on the toughness and cohesiveness of epoxy system. The micrograph of neat epoxy exhibits the typical smooth and brilliant surface belongs to brittle materials. The fracture process is originated from a small area in the cross-section. Nevertheless, the fracture surface of filled materials show differential fractographical feature and rougher surface with the MWCNTs added to the epoxy matrix. POLYM. COMPOS., 35:964–968, 2014. © 2013 Society of Plastics Engineers

  • Facile fabrication of multi-walled carbon nanotubes and its enhancement on Thermally Conductive Adhesive applied in heat dissipation devices
    Materials & Design, 2013
    Co-Authors: Junxia Wang, Shilin Yan, Rui Bao, Kelun Yang, Zhongjiang Feng
    Abstract:

    Abstract A facile synthetic scheme of amine-grafted multi-walled carbon nanotubes (MWCNTs) using silane coupling agent has been illustrated, which has not been reported in literature. The fabricated MWCNTs were characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and field emission scanning electron micrograph (FESEM). The results indicate that the amine groups have been grafted onto the surface of MWCNTs and symmetry of MWCNTs was not destroyed, simultaneously, they generated such large polar forces among nanotubes that they formed close-packed structure. Also, they were well dispersed in resin matrix and their distribution was relatively homogenous because there was less nanotubes pulled out on the fracture surface. The thermal analysis was taken for investigation of the thermal stability and thermal decomposition behavior. The comparative analysis proved the existence of amine groups and its total weight of 11 wt.%. The efficient interaction between amine grafted MWCNTs enhanced the crosslink density and the values of glass transition temperature which confirmed the efficient compatibility with resin matrix.