Shandong Institute of Nonmetal Materials

Jinan, China

Shandong Institute of Nonmetal Materials

Jinan, China
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Zheng Y.,Marine Innovation and Technology | Wang X.,Marine Innovation and Technology | Wei S.,Marine Innovation and Technology | Zhang B.,Shandong Institute of Nonmetal Materials | And 3 more authors.
Composites Part A: Applied Science and Manufacturing | Year: 2017

Graphene is a promising lightweight microwave absorption (MA) absorber, but the limited dielectric loss and nonmagnetic characteristic have impeded its further applications. Through the structure modification, porous (1–2.5 μm) graphene was successfully prepared via a simple pyrolysis process, and the minimum reflection loss (RL) value reached −48 dB at 9.8 GHz, which demonstrated that porous graphene (PG) showed outstanding MA performance than the ordinary graphene (OG). In order to strengthen the magnetic loss, and then boost the impedance matching, Fe3O4 nanoparticles (∼10 nm) were deposited uniformly on the surface of PG via in situ precipitation to synthesize porous graphene-Fe3O4 (PG-Fe3O4) composites. It was found that the as-prepared PG-Fe3O4 composites showed especially high MA performance, and the minimum RL of −53.0 dB was achieved at 5.4 GHz with the thickness of 6.1 mm. The absorption bandwidth of RL less than −10 dB was from 12.6 to 18.0 GHz (5.4 GHz) with a thin thickness of 2.7 mm. The excellent MA properties of PG-Fe3O4 composites were the consequence of the perfect impedance matching, porous structure as well as the multi-polarization. These results demonstrated that the PG-Fe3O4 composites with excellent MA properties and lightweight should be promising absorbers for practical applications. © 2017


Wang X.,Qingdao University of Science and Technology | Yu M.,Shandong Institute of Nonmetal Materials | Zhang W.,Shandong Institute of Nonmetal Materials | Zhang B.,Shandong Institute of Nonmetal Materials | And 2 more authors.
Applied Physics A: Materials Science and Processing | Year: 2014

Graphene/nickel composite materials were successfully prepared via a one-step in situ reduction from nickel chloride, graphene oxide, and hydrazine at 80 °C for 3 h. Face-centered cubic Ni nanostructures with uniform size and high dispersion assembled on graphene sheets. Through the measurement of complex relative permittivity and permeability, their microwave absorption properties were evaluated. In comparison with pure Ni nanoparticles and graphene, the composite materials demonstrated much better characteristics of microwave absorption. The lowest reflection loss value of the composites with a thickness of 3 mm can reach −23.3 dB at 7.5 GHz. Our research reveals that graphene/Ni composites are promising microwave absorption materials with desirable absorption properties and reduced material weight. © 2014, Springer-Verlag Berlin Heidelberg.


Guo H.,Xi'an Research Institute of High Technology | Xun Q.,Shandong Institute of Nonmetal Materials | Liu S.,Xi'an Jiaotong University | Wang X.,Xi'an Research Institute of High Technology
SAE Technical Papers | Year: 2015

In the present paper, a new biofuel ethylene glycol monomethyl ether soyate has been developed. The biofuel was synthesized with a refined soybean oil and ethylene glycol monomethyl ether as reactants and sodium as catalyst under 90°C. The synthesized crude product was purified and structurally identified through Fourier Transform Infrared Spectrum (FT-IR), 1H Nuclear Magnetic Resonance Spectroscopy (1H NMR) and Gel Permeation Chromatography (GPC) analyses. The physicochemical properties of the biofuel and its addition effects on properties of diesel fuel were measured according to China national standard test methods. A single cylinder diesel engine was employed to evaluate the influences of the biofuel on engine fuel economy and engine-out emissions of CO, HC, NOx and smoke. Test results reveal that when the diesel engine is fueled with this biofuel, engine-out smoke emissions can be decreased by 54.7% to 85.7%, CO emissions reduced by up to 79.1% and unburned HC emissions lessened by 61.6%. When the diesel engine burns a 1:1 by volume mixture of the biofuel and diesel fuel, smoke emissions can be diminished by 46.5% to 83.3%, CO decreased by up to 69.8% and HC emissions reduced by 59.6%. NOx emissions generally do not change significantly, fuel consumption increased by 1.4% to16.9%, but energy consumption decreased by 3.2% to 7.9%. © 2015 SAE International.


Wang X.,Qingdao University of Science and Technology | Wang X.,Qingdao University | Dong L.,Qingdao University of Science and Technology | Zhang B.,Shandong Institute of Nonmetal Materials | And 2 more authors.
Nanotechnology | Year: 2016

Copper is a good dielectric loss material but has low stability, whereas nickel is a good magnetic loss material and is corrosion resistant but with low conductivity, therefore Cu-Ni hybrid nanostructures have synergistic advantages as microwave absorption (MA) materials. Different Cu/Ni molar ratios of bimetallic nanowires (Cu13@Ni7, Cu5@Ni5 and Cu7@Ni13) and nanospheres (Cu13@Ni7, Cu5@Ni5 and Cu1@Ni3) have been successfully synthesized via facile reduction of hydrazine under similar reaction conditions, and the morphology can be easily tuned by varying the feed ratio or the complexing agent. Apart from the concentrations of Cu2+ and Ni2+, the reduction parameters are similar for all samples to confirm the effects of the Cu/Ni molar ratio and morphology on MA properties. Ni is incorporated into the Cu-Ni nanomaterials as a shell over the Cu core at low temperature, as proved by XRD, SEM, TEM and XPS. Through the complex relative permittivity and permeability, reflection loss was evaluated, which revealed that the MA capacity greatly depended on the Cu/Ni molar ratio and morphology. For Cu@Ni nanowires, as the molar ratio of Ni shell increased the MA properties decreased accordingly. However, for Cu@Ni nanospheres, the opposite trend was found, that is, as the molar ratio of the Ni shell increased the MA properties increased. © 2016 IOP Publishing Ltd.


Wang X.,Qingdao University | Zhang B.,Shandong Institute of Nonmetal Materials | Yu M.,Shandong Institute of Nonmetal Materials | Liu J.,Qingdao University
RSC Advances | Year: 2016

Hierarchical hybrid nanostructures are desirable materials for microwave absorption (MA) capacity. However, how to obtain this kind of versatile structural materials still remains a great challenge. In this work, a novel MA composite of MnO2@NiMoO4 was synthesized via two-step hydrothermal processes combined with a simple annealing process. As confirmed by X-ray diffraction, scanning electron microscopy, energy-dispersive spectrometry, and transmission electron microscopy analysis, the well-defined NiMoO4 nanosheets could uniformly cover the surface of the MnO2 nanorods. Compared with pure MnO2 nanorods, these hierarchical composite structures could provide a higher superficial area, and more effective components, which will favor the penetration of microwaves into the absorber effectively instead of reflecting it, and then translate it into thermal energy. The minimum reflection loss (RL) value of MnO2@NiMoO4 composites was -31.4 dB at 11.2 GHz with a thickness of 3 mm, and the band of reflection loss was below -10 dB when frequency was in the range from 9.6 to 14.1 GHz. However, the minimum RL value of MnO2 was only -12.5 dB at 10.4 GHz with a thickness of 3 mm. The significantly enhanced microwave absorption of MnO2@NiMoO4 composites is mainly attributed to the hierarchical hybrid nanostructures, multi-effective components, good impedance matching, and interfacial polarization between MnO2 and NiMoO4. Meanwhile, the surface attached NiMoO4 is useful to increase the multiple reflection of electromagneticwaves. It is believed that these MnO2@NiMoO4 composites could serve as an excellent microwave absorber in practical applications. © The Royal Society of Chemistry 2016.


Wang X.,Qingdao University of Science and Technology | Yu J.,Qingdao University of Science and Technology | Dong H.,Qingdao University of Science and Technology | Yu M.,Shandong Institute of Nonmetal Materials | And 3 more authors.
Applied Physics A: Materials Science and Processing | Year: 2015

In this work, metal oxide (MnO2, SnO2 and Co3O4)–graphene composite materials were successfully prepared via different synthesis methods. Uniform metal oxide nanoparticles were well dispersed on graphene sheets, and transmission electron microscopy characterizations showed that the average sizes of MnO2, SnO2, and Co3O4 particles were about 60, 5, and 10 nm, respectively. Reflection losses of graphene composites and pure graphene were systematically evaluated between 2 and 18 GHz, which revealed that all composites exhibited enhanced microwave absorption properties compared to pure graphene. The minimum reflection losses of MnO2-graphene, SnO2–graphene, and Co3O4–graphene composites with a thickness of 2.0 mm were −20.9, −15.28, and −7.3 dB at the frequency of 14.8, 15.94, and 9.6 GHz, respectively, whereas −4.5 dB for pure graphene. The enhanced absorption ability probably originated from the combined advantage of metal oxide particles and graphene, which proved beneficial to improve the impedance matching of permittivity and permeability. Besides, the intrinsic characteristics of MnO2, SnO2, and Co3O4 nanoparticles, the interface between nanostructured metal oxides and graphene sheets, and the multi-dielectric relaxation processes are all influence factors to improve the properties of microwave absorption. © 2015, Springer-Verlag Berlin Heidelberg.

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