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Hongsheng Zhao

Bio: Hongsheng Zhao is an academic researcher from Tsinghua University. The author has contributed to research in topics: Graphite & Coating. The author has an hindex of 14, co-authored 72 publications receiving 754 citations. Previous affiliations of Hongsheng Zhao include Northwestern Polytechnical University.


Papers
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TL;DR: In this article, the dielectric properties of nano Si/C/N composite powder and nano SiC powder at high frequencies have been studied at a frequency range of 8.2-12.4 GHz.
Abstract: The dielectric properties of nano Si/C/N composite powder and nano SiC powder at high frequencies have been studied. The nano Si/C/N composite powder and nano SiC powder were synthesized from hexamethyldisilazane ((Me3Si)2NH) (Me:CH3) and SiH4–C2H2, respectively, by a laser-induced gas-phase reaction. The complex permittivities of the nano Si/C/N composite powder and nano SiC powder were measured at a frequency range of 8.2–12.4 GHz. The real part (e′) and imaginary part (e″) of the complex permittivity, and dissipation factor ( tg δ=e″/e′) of nano Si/C/N composite powder are much higher than those of nano SiC powder and bulk SiC, Si3N4, SiO2, and Si, especially the tg δ . The promising features of nano Si/C/N composite powder would be due to more complicated Si, C, and N atomic chemical environment than in a mixture of pure SiC and Si3N4 phase. The charged defects and quasi-free electrons moved in response to the electric field, diffusion or polarization current resulted from the field propagation. Because there exists graphite in the nano Si/C/N composite powder, some charge carries are related to the sp3 dangling bonds (of silicon and carbon) and unsaturated sp2 carbons. The high e″ and tg δ of nano Si/C/N composite powder were due to the dielectric relaxation. The nano Si/C/N composite powder would be a good candidate for electromagnetic interface shielding material.

86 citations

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TL;DR: In this paper, the influence of curing temperature, curing time, additive mass of curing agent, silane coupling agent (SCA), conductive solder and SiO 2 nanoparticles on the properties of heat-curable conductive adhesive, such as curing, interconnect, adhesion strength, and electronic conductivity are researched.

71 citations

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TL;DR: In this paper, the acid activation bentonites were suitable for decolorization of cottonseed oil through removing carotene and chlorophyll, and the bleaching capabilities of different pigments with activated bentonite with treatment of 25% sulfuric acid were 70.3%, 73.1%, 83.2%, 81.8% and 88.9%, respectively.

56 citations

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TL;DR: In this article, the adsorption of protein from model wine was investigated under different temperatures, pH values, contact times, and concentrations of ethanol, by certain bentonites.

47 citations

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Limin Shi1, Hongsheng Zhao1, Yinghui Yan1, Ziqiang Li1, Chunhe Tang1 
TL;DR: In this article, a three-step process is used to fabricate submicron silicon carbide powders in the reaction of silicon with carbon during the third step of thermal treatment.

44 citations


Cited by
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TL;DR: Besides the excellent high-temperature mechanical properties, Si3N4 and SiC based ceramics containing insulating or electrically conductive phase are attractive for their tunable dielectric propert...
Abstract: Besides the excellent high-temperature mechanical properties, Si3N4 and SiC based ceramics containing insulating or electrically conductive phase are attractive for their tunable dielectric propert...

466 citations

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TL;DR: Macroporous silicon carbide is widely used in various industrial applications including filtration for gas and water, absorption, catalyst supports, concentrated solar power, thermoelectric....

302 citations

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TL;DR: In this paper, a review summarizes adsorption of proteins and nucleic acids (DNA, RNA) on natural clay minerals of layer phyllosilicates such as montmorillonite, kaolinite and illite and their interactions.

236 citations

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TL;DR: In this paper, SiC NWs were in situ formed by the addition of ferrocene, and the content of SiCNWs increased with the increases of annealing temperature and ferrocenes content.
Abstract: Silicon carbide nanowires (SiC NWs) reinforced SiOC ceramics were fabricated through in situ growth of SiC NWs in SiOC ceramics by pyrolysis of polysiloxane. SiC NWs were in situ formed by the addition of ferrocene, the content of SiC NWs increased with the increases of annealing temperature and ferrocene content. Due to the formation of SiC NWs in the inter-particle pores of SiOC ceramics, the SiOC particles were bridged by SiC NWs, which led to the increase of electrical conductivity. With the increase of SiC NWs content, the real permittivity and the imaginary permittivity increased from 3.63 and 0.14 to 10.72 and 12.17, respectively, and the minimum reflection coefficient decreased from −1.22 dB to −20.01 dB, demonstrating the SiOC ceramics with SiC NWs had a superior microwave-absorbing ability.

212 citations