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153 results on '"Wang, Rumin"'

18. In Situ Growth of CoNi Alloy/N-Doped Hollow Carbon Foam for Electromagnetic Wave Absorption.

Author

Guo, Xiaoli, Nie, Zhuguang, Feng, Yang, Jiang, Mingyu, Zhao, Zhiyue, Yang, XiaoNan, Wang, Rumin, and Qi, Shuhua

Abstract

To meet the demands for high-performance and cost-effective electromagnetic wave absorbers in practical applications, CoNi alloy/N-doped hollow carbon foam (CoNi/NCF) was synthesized using melamine foam as a precursor through a hydrothermal reaction. By introduction of appropriate CoNi alloys to form uniform magnetic metal nanoparticles on the surface of NCF, the electromagnetic wave absorption performance of NCF can be adjusted. These metal nanoparticles formed rich heterogeneous interfaces with the NCF, enhancing the interface polarization loss of the composite material to electromagnetic waves. The CoNi alloy increased the conductivity of composite materials, which was conducive to the formation of a three-dimensional conductive network and promoted the conduction loss of electromagnetic waves. As a magnetic metal, the CoNi alloy also brought magnetic losses to composite materials, increasing the ways to consume electromagnetic waves. Additionally, the doping of N atoms increased the dipole polarization loss of the NCF. The minimum reflection loss (RLmin) of CoNi/NCF reached −47.35 dB, and the maximum effective absorption bandwidth (EAB) reached 5.6 GHz (2.4 mm). CoNi/NCF effectively reduced the radar cross-section (RCS) signal on the surface of the electric conductor layer. This study provides a feasible strategy for developing magnetic composite carbon materials with an efficient electromagnetic wave absorption performance. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Curing Kinetics of Hybrid Networks Composed of Benzoxazine and Multifunctional Novolac Epoxy

Author

Wu Ke, Wang Rumin, and Zeng Jinfang

Subjects
Chemical technology, TP1-1185
Abstract

A novel hybrid network composed of benzoxazines (BZ) and novolac epoxy resin (F-51) was prepared successfully. Thermal properties, curing kinetics, and decomposition process were studied using isothermal differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) in this paper. The reactive mechanism of F-51/BZ mixture system is different from the BZ homopolymers at low temperatures; two resin systems follow the autocatalytic model mainly at high temperatures. Thermogravimetric analysis indicates that F-51 can have no significant effect on thermal degradation temperatures and on increasing char yield.

Published
2015
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48. NiSe@MoSe2 foam: synthesis, characterization and microwave absorption investigation.

Author

Zan, Shuyu, Zhang, Weidong, Li, Haiming, Wang, Rumin, and Qi, Shuhua

Abstract

To take the advantage of good conductivity and network structure of Ni foam, the NiSe@MoSe2 foam is prepared by transforming Ni into NiSe and growing a layer of MoSe2 on the outside. In theory, the NiSe network can help to form conduction network and generate conduction loss, and causes dipole polarization loss. Additionally, the MoSe2 sheath can give rise to both dipole and interface polarization loss. The prepared composite not only has proper impedance matching but also displays good attenuation capability. The minimum reflection loss is -30.9 dB and the effective absorption bandwidth is 3.8 GHz. [ABSTRACT FROM AUTHOR]

Published
2023
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