The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Wancheng Zhou - One of the best experts on this subject based on the ideXlab platform.
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graphene nanosheet and flake carbonyl iron particle filled Epoxy Silicone composites as thin thickness and wide bandwidth microwave absorber
Carbon, 2015Co-Authors: Yuchang Qing, Y H Zhou, Wancheng ZhouAbstract:Abstract An Epoxy–Silicone matrix filled with both graphene nanosheets (GNs) and flake carbonyl iron (FCI) particles was prepared, and the influence of GNs and/or FCI particle content on the electromagnetic and microwave-absorbing properties was investigated in the frequency range of 2–18 GHz. Thin–thickness, broadband absorption microwave absorbers with homogeneously dispersed GNs and FCI particles were obtained. The values and frequency dependencies of the electromagnetic properties of such absorbers can be adjusted by simply changing the content of GNs and/or FCI particles. These changes led to an apparent improvement of impedance matching and then significantly improved the microwave absorptions. Reflection loss values exceeding −6 dB (>74.9% absorption) can be obtained in the frequency range of 5.4–18 GHz with a thickness of 0.9 mm.
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evolution of double magnetic resonance behavior and electromagnetic properties of flake carbonyl iron and multi walled carbon nanotubes filled Epoxy Silicone
Journal of Alloys and Compounds, 2014Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Shansha Huang, Zhibi Huang, Dongmei ZhuAbstract:Abstract The complex permittivity and permeability, reflection loss of the flake carbonyl iron (FCI) particles and multi-walled carbon nanotubes (MWCNTs) filled Epoxy-Silicone resin were investigated in the frequency range of 2–18 GHz. Both the values of complex permittivity and permeability were enhanced with increasing FCI content. The magnetic resonance behavior of such composites was mainly depended on the content of FCI particles, and the μ ″ –f spectra changed from no visible peak to double resonance as the FCI content increased from 10 to 50 wt%. Single-layer and multi-layer microwave absorbing coatings were also designed based on the transmission line theory and electromagnetic properties of the absorber. By changing the filler content and/or optimizing the absorber structure, the measured reflection loss below −10 dB can be obtained in the frequency range of 2–16.9 GHz for FCI particles and MWCNTs filled four-layer absorber.
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Epoxy Silicone filled with multi walled carbon nanotubes and carbonyl iron particles as a microwave absorber
Carbon, 2010Co-Authors: Yuchang Qing, Wancheng ZhouAbstract:Abstract Microwave absorbing composites with Epoxy-Silicone as matrix and both multi-walled carbon nanotubes (MWCNTs) and carbonyl iron (CI) particles as absorbers were prepared, and their electromagnetic and microwave absorbing properties were investigated in the frequency range of 2–18 GHz. The microstructures of the composites show a uniform dispersion of the MWCNTs and CI particles in the matrix. The complex permittivity of the composites increased with increasing MWCNT content. A double resonance behavior of the complex permeability has been observed. One is due to the domain wall motion at about 7.5 GHz and the other is due to spin rotation at about 13.5 GHz. Reflection loss values exceeding −5 dB can be obtained in the frequency range of 10.4–18, 4.4–18 and 2–18 GHz, when the composite thickness is 0.5, 1 and 1.5 mm, respectively. A minimum reflection loss of −16.9 dB at 10.5 GHz and a bandwidth over the frequency range of 3.4–18 GHz with reflection loss below −10 dB can obtained for a composite filled with 0.5 vol% MWCNT and 50 vol% CI particles.
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microwave electromagnetic properties of carbonyl iron particles and si c n nano powder filled Epoxy Silicone coating
Physica B-condensed Matter, 2010Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Dongmei ZhuAbstract:Abstract The electromagnetic characteristics of carbonyl iron particles and Si/C/N nano-powder filled Epoxy-Silicone coatings were studied. The reflection loss of the coatings exceeds −10 dB at 8–18 GHz and −9 dB at 2–18 GHz when the coating thickness is 1 and 3 mm, respectively. The dielectric and magnetic absorbers filled coatings possess excellent microwave absorption, which could be attributed to the proper incorporate of the multi-polarization mechanisms as well as strong natural resonance. It is feasible to develop the thin and wideband microwave absorbing coatings using carbonyl iron particles and Si/C/N nano-powder.
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dielectric properties of carbon black and carbonyl iron filled Epoxy Silicone resin coating
Journal of Materials Science, 2010Co-Authors: Yuchang Qing, S Jia, Fa Luo, Wancheng Zhou, Dongmei ZhuAbstract:The dielectric properties of Epoxy–Silicone resin coatings containing carbon black (CB) and carbonyl iron (CI) particles as a function of frequency (2–18 GHz) and the CB volume content (0.2–1%) have been investigated. The complex permittivity of the coatings increased with increasing CB content, which mainly attributed to the interfacial polarization at the CB/resin/CI particles interfaces. The complex permittivity also decreased rapidly with increasing frequency in the low frequency range while decreased slowly in the high frequency range. The changes of dielectric properties with frequency and the CB volume content were discussed using the power-law decay and the concept of interfacial polarization.
Yuchang Qing - One of the best experts on this subject based on the ideXlab platform.
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graphene nanosheet and flake carbonyl iron particle filled Epoxy Silicone composites as thin thickness and wide bandwidth microwave absorber
Carbon, 2015Co-Authors: Yuchang Qing, Y H Zhou, Wancheng ZhouAbstract:Abstract An Epoxy–Silicone matrix filled with both graphene nanosheets (GNs) and flake carbonyl iron (FCI) particles was prepared, and the influence of GNs and/or FCI particle content on the electromagnetic and microwave-absorbing properties was investigated in the frequency range of 2–18 GHz. Thin–thickness, broadband absorption microwave absorbers with homogeneously dispersed GNs and FCI particles were obtained. The values and frequency dependencies of the electromagnetic properties of such absorbers can be adjusted by simply changing the content of GNs and/or FCI particles. These changes led to an apparent improvement of impedance matching and then significantly improved the microwave absorptions. Reflection loss values exceeding −6 dB (>74.9% absorption) can be obtained in the frequency range of 5.4–18 GHz with a thickness of 0.9 mm.
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evolution of double magnetic resonance behavior and electromagnetic properties of flake carbonyl iron and multi walled carbon nanotubes filled Epoxy Silicone
Journal of Alloys and Compounds, 2014Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Shansha Huang, Zhibi Huang, Dongmei ZhuAbstract:Abstract The complex permittivity and permeability, reflection loss of the flake carbonyl iron (FCI) particles and multi-walled carbon nanotubes (MWCNTs) filled Epoxy-Silicone resin were investigated in the frequency range of 2–18 GHz. Both the values of complex permittivity and permeability were enhanced with increasing FCI content. The magnetic resonance behavior of such composites was mainly depended on the content of FCI particles, and the μ ″ –f spectra changed from no visible peak to double resonance as the FCI content increased from 10 to 50 wt%. Single-layer and multi-layer microwave absorbing coatings were also designed based on the transmission line theory and electromagnetic properties of the absorber. By changing the filler content and/or optimizing the absorber structure, the measured reflection loss below −10 dB can be obtained in the frequency range of 2–16.9 GHz for FCI particles and MWCNTs filled four-layer absorber.
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Epoxy Silicone filled with multi walled carbon nanotubes and carbonyl iron particles as a microwave absorber
Carbon, 2010Co-Authors: Yuchang Qing, Wancheng ZhouAbstract:Abstract Microwave absorbing composites with Epoxy-Silicone as matrix and both multi-walled carbon nanotubes (MWCNTs) and carbonyl iron (CI) particles as absorbers were prepared, and their electromagnetic and microwave absorbing properties were investigated in the frequency range of 2–18 GHz. The microstructures of the composites show a uniform dispersion of the MWCNTs and CI particles in the matrix. The complex permittivity of the composites increased with increasing MWCNT content. A double resonance behavior of the complex permeability has been observed. One is due to the domain wall motion at about 7.5 GHz and the other is due to spin rotation at about 13.5 GHz. Reflection loss values exceeding −5 dB can be obtained in the frequency range of 10.4–18, 4.4–18 and 2–18 GHz, when the composite thickness is 0.5, 1 and 1.5 mm, respectively. A minimum reflection loss of −16.9 dB at 10.5 GHz and a bandwidth over the frequency range of 3.4–18 GHz with reflection loss below −10 dB can obtained for a composite filled with 0.5 vol% MWCNT and 50 vol% CI particles.
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electromagnetic and microwave absorption properties of carbonyl iron and carbon fiber filled Epoxy Silicone resin coatings
Applied Physics A, 2010Co-Authors: Yuchang Qing, S Jia, Fa Luo, W C Zhou, Dongmei ZhuAbstract:The microwave electromagnetic properties of carbonyl-iron particles as magnetic absorber and carbon fiber as conductive absorber filled insulating Epoxy/Silicone resin coatings were investigated. The complex permittivity of the coatings increased while the complex permeability remained almost constant in the frequency range of 2–18 GHz, when the carbon fiber content was increased and the carbonyl-iron content kept constant. The minimum reflection loss of the coatings shifted to the lower frequency region by increasing the carbon fiber content or coating thickness. When the content of carbonyl iron was 65 wt% and carbon fiber was 2 wt%, the reflection loss below −10 dB can obtain in the frequency range of 8–18 GHz with coating thickness being 1 mm.
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microwave electromagnetic properties of carbonyl iron particles and si c n nano powder filled Epoxy Silicone coating
Physica B-condensed Matter, 2010Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Dongmei ZhuAbstract:Abstract The electromagnetic characteristics of carbonyl iron particles and Si/C/N nano-powder filled Epoxy-Silicone coatings were studied. The reflection loss of the coatings exceeds −10 dB at 8–18 GHz and −9 dB at 2–18 GHz when the coating thickness is 1 and 3 mm, respectively. The dielectric and magnetic absorbers filled coatings possess excellent microwave absorption, which could be attributed to the proper incorporate of the multi-polarization mechanisms as well as strong natural resonance. It is feasible to develop the thin and wideband microwave absorbing coatings using carbonyl iron particles and Si/C/N nano-powder.
Dongmei Zhu - One of the best experts on this subject based on the ideXlab platform.
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evolution of double magnetic resonance behavior and electromagnetic properties of flake carbonyl iron and multi walled carbon nanotubes filled Epoxy Silicone
Journal of Alloys and Compounds, 2014Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Shansha Huang, Zhibi Huang, Dongmei ZhuAbstract:Abstract The complex permittivity and permeability, reflection loss of the flake carbonyl iron (FCI) particles and multi-walled carbon nanotubes (MWCNTs) filled Epoxy-Silicone resin were investigated in the frequency range of 2–18 GHz. Both the values of complex permittivity and permeability were enhanced with increasing FCI content. The magnetic resonance behavior of such composites was mainly depended on the content of FCI particles, and the μ ″ –f spectra changed from no visible peak to double resonance as the FCI content increased from 10 to 50 wt%. Single-layer and multi-layer microwave absorbing coatings were also designed based on the transmission line theory and electromagnetic properties of the absorber. By changing the filler content and/or optimizing the absorber structure, the measured reflection loss below −10 dB can be obtained in the frequency range of 2–16.9 GHz for FCI particles and MWCNTs filled four-layer absorber.
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electromagnetic and microwave absorption properties of carbonyl iron and carbon fiber filled Epoxy Silicone resin coatings
Applied Physics A, 2010Co-Authors: Yuchang Qing, S Jia, Fa Luo, W C Zhou, Dongmei ZhuAbstract:The microwave electromagnetic properties of carbonyl-iron particles as magnetic absorber and carbon fiber as conductive absorber filled insulating Epoxy/Silicone resin coatings were investigated. The complex permittivity of the coatings increased while the complex permeability remained almost constant in the frequency range of 2–18 GHz, when the carbon fiber content was increased and the carbonyl-iron content kept constant. The minimum reflection loss of the coatings shifted to the lower frequency region by increasing the carbon fiber content or coating thickness. When the content of carbonyl iron was 65 wt% and carbon fiber was 2 wt%, the reflection loss below −10 dB can obtain in the frequency range of 8–18 GHz with coating thickness being 1 mm.
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microwave electromagnetic properties of carbonyl iron particles and si c n nano powder filled Epoxy Silicone coating
Physica B-condensed Matter, 2010Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Dongmei ZhuAbstract:Abstract The electromagnetic characteristics of carbonyl iron particles and Si/C/N nano-powder filled Epoxy-Silicone coatings were studied. The reflection loss of the coatings exceeds −10 dB at 8–18 GHz and −9 dB at 2–18 GHz when the coating thickness is 1 and 3 mm, respectively. The dielectric and magnetic absorbers filled coatings possess excellent microwave absorption, which could be attributed to the proper incorporate of the multi-polarization mechanisms as well as strong natural resonance. It is feasible to develop the thin and wideband microwave absorbing coatings using carbonyl iron particles and Si/C/N nano-powder.
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dielectric properties of carbon black and carbonyl iron filled Epoxy Silicone resin coating
Journal of Materials Science, 2010Co-Authors: Yuchang Qing, S Jia, Fa Luo, Wancheng Zhou, Dongmei ZhuAbstract:The dielectric properties of Epoxy–Silicone resin coatings containing carbon black (CB) and carbonyl iron (CI) particles as a function of frequency (2–18 GHz) and the CB volume content (0.2–1%) have been investigated. The complex permittivity of the coatings increased with increasing CB content, which mainly attributed to the interfacial polarization at the CB/resin/CI particles interfaces. The complex permittivity also decreased rapidly with increasing frequency in the low frequency range while decreased slowly in the high frequency range. The changes of dielectric properties with frequency and the CB volume content were discussed using the power-law decay and the concept of interfacial polarization.
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microwave absorbing and mechanical properties of carbonyl iron Epoxy Silicone resin coatings
Journal of Magnetism and Magnetic Materials, 2009Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Dongmei ZhuAbstract:Abstract Coatings with flake carbonyl-iron particles as absorber and Epoxy-Silicone resins as matrix were prepared. The complex permittivity, complex permeability and microwave-absorbing properties were investigated in the frequency range of 2–18 GHz. Both the real part of permittivity and permeability were increased with carbonyl-iron weight concentration. The minimum reflection loss shifts to the low-frequency region with increase in carbonyl-iron weight concentrations. The minimum reflection loss value of −42.5 dB was obtained at 10.6 GHz for the coatings with 55 wt% carbonyl-iron. The values of adhesive power and impact strength are up to 24 MPa and 50 kg cm, respectively. These results show that the coatings possess good microwave-absorbing and mechanical properties.
Fa Luo - One of the best experts on this subject based on the ideXlab platform.
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evolution of double magnetic resonance behavior and electromagnetic properties of flake carbonyl iron and multi walled carbon nanotubes filled Epoxy Silicone
Journal of Alloys and Compounds, 2014Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Shansha Huang, Zhibi Huang, Dongmei ZhuAbstract:Abstract The complex permittivity and permeability, reflection loss of the flake carbonyl iron (FCI) particles and multi-walled carbon nanotubes (MWCNTs) filled Epoxy-Silicone resin were investigated in the frequency range of 2–18 GHz. Both the values of complex permittivity and permeability were enhanced with increasing FCI content. The magnetic resonance behavior of such composites was mainly depended on the content of FCI particles, and the μ ″ –f spectra changed from no visible peak to double resonance as the FCI content increased from 10 to 50 wt%. Single-layer and multi-layer microwave absorbing coatings were also designed based on the transmission line theory and electromagnetic properties of the absorber. By changing the filler content and/or optimizing the absorber structure, the measured reflection loss below −10 dB can be obtained in the frequency range of 2–16.9 GHz for FCI particles and MWCNTs filled four-layer absorber.
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electromagnetic and microwave absorption properties of carbonyl iron and carbon fiber filled Epoxy Silicone resin coatings
Applied Physics A, 2010Co-Authors: Yuchang Qing, S Jia, Fa Luo, W C Zhou, Dongmei ZhuAbstract:The microwave electromagnetic properties of carbonyl-iron particles as magnetic absorber and carbon fiber as conductive absorber filled insulating Epoxy/Silicone resin coatings were investigated. The complex permittivity of the coatings increased while the complex permeability remained almost constant in the frequency range of 2–18 GHz, when the carbon fiber content was increased and the carbonyl-iron content kept constant. The minimum reflection loss of the coatings shifted to the lower frequency region by increasing the carbon fiber content or coating thickness. When the content of carbonyl iron was 65 wt% and carbon fiber was 2 wt%, the reflection loss below −10 dB can obtain in the frequency range of 8–18 GHz with coating thickness being 1 mm.
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microwave electromagnetic properties of carbonyl iron particles and si c n nano powder filled Epoxy Silicone coating
Physica B-condensed Matter, 2010Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Dongmei ZhuAbstract:Abstract The electromagnetic characteristics of carbonyl iron particles and Si/C/N nano-powder filled Epoxy-Silicone coatings were studied. The reflection loss of the coatings exceeds −10 dB at 8–18 GHz and −9 dB at 2–18 GHz when the coating thickness is 1 and 3 mm, respectively. The dielectric and magnetic absorbers filled coatings possess excellent microwave absorption, which could be attributed to the proper incorporate of the multi-polarization mechanisms as well as strong natural resonance. It is feasible to develop the thin and wideband microwave absorbing coatings using carbonyl iron particles and Si/C/N nano-powder.
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dielectric properties of carbon black and carbonyl iron filled Epoxy Silicone resin coating
Journal of Materials Science, 2010Co-Authors: Yuchang Qing, S Jia, Fa Luo, Wancheng Zhou, Dongmei ZhuAbstract:The dielectric properties of Epoxy–Silicone resin coatings containing carbon black (CB) and carbonyl iron (CI) particles as a function of frequency (2–18 GHz) and the CB volume content (0.2–1%) have been investigated. The complex permittivity of the coatings increased with increasing CB content, which mainly attributed to the interfacial polarization at the CB/resin/CI particles interfaces. The complex permittivity also decreased rapidly with increasing frequency in the low frequency range while decreased slowly in the high frequency range. The changes of dielectric properties with frequency and the CB volume content were discussed using the power-law decay and the concept of interfacial polarization.
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microwave absorbing and mechanical properties of carbonyl iron Epoxy Silicone resin coatings
Journal of Magnetism and Magnetic Materials, 2009Co-Authors: Yuchang Qing, Fa Luo, Wancheng Zhou, Dongmei ZhuAbstract:Abstract Coatings with flake carbonyl-iron particles as absorber and Epoxy-Silicone resins as matrix were prepared. The complex permittivity, complex permeability and microwave-absorbing properties were investigated in the frequency range of 2–18 GHz. Both the real part of permittivity and permeability were increased with carbonyl-iron weight concentration. The minimum reflection loss shifts to the low-frequency region with increase in carbonyl-iron weight concentrations. The minimum reflection loss value of −42.5 dB was obtained at 10.6 GHz for the coatings with 55 wt% carbonyl-iron. The values of adhesive power and impact strength are up to 24 MPa and 50 kg cm, respectively. These results show that the coatings possess good microwave-absorbing and mechanical properties.
G Rajagopal - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of Epoxy Silicone polythiophene interpenetrating polymer network for corrosion protection of steel
Progress in Organic Coatings, 2012Co-Authors: S Palraj, M Selvaraj, M Vidhya, G RajagopalAbstract:Abstract Polymer alloys, particularly interpenetrating polymer networks (IPNs) exhibit excellent coating properties. Often combination of polymers result in IPNs with controlled morphologies and synergistic behavior. In this study, corrosion-resistant IPNs were prepared from immiscible resins (Epoxy, Silicone and thiophene) using a cross-linking agent and a catalyst. GPC, FTIR, NMR, TG, DTA and SEM studies used to fix the best performing IPN. Surface morphology studies using SEM confirm the incorporation of Silicone and polythiophene in to the Epoxy polymer to form homogeneously micro structured IPN. The heat-resistance of the IPN was determined as per ASTM 2485. The improved corrosion resistance of the IPN was evaluated by AC impedance measurements.
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synthesis and characterization of Epoxy Silicone polythiophene interpenetrating polymer network for corrosion protection of steel
Progress in Organic Coatings, 2012Co-Authors: S Palraj, M Selvaraj, M Vidhya, G RajagopalAbstract:Abstract Polymer alloys, particularly interpenetrating polymer networks (IPNs) exhibit excellent coating properties. Often combination of polymers result in IPNs with controlled morphologies and synergistic behavior. In this study, corrosion-resistant IPNs were prepared from immiscible resins (Epoxy, Silicone and thiophene) using a cross-linking agent and a catalyst. GPC, FTIR, NMR, TG, DTA and SEM studies used to fix the best performing IPN. Surface morphology studies using SEM confirm the incorporation of Silicone and polythiophene in to the Epoxy polymer to form homogeneously micro structured IPN. The heat-resistance of the IPN was determined as per ASTM 2485. The improved corrosion resistance of the IPN was evaluated by AC impedance measurements.