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Flexible and densified graphene/waterborne polyurethane composite film with thermal conducting property for high performance electromagnetic interference shielding

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Nano Research 2022年第11期15卷 9926-9935页

作者： Wang Yang Hengxuan Bai Bo Jiang Chaonan Wang Weimin Ye Zhengxuan Li Chong Xu Xiaobai Wang Yongfeng Li State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Department of Materials Application Research AVIC Manufacturing Technology InstituteBeijing 100024China

High-performance electromagnetic interference(EMI)shielding materials with flexibility,excellent mechanical property,and thermal conductivity are highly desired for fifth-generation communications devices.Graphene exhibits tremendous potential due to its high electrical conductivity and unique lamellar structure.However,the construction of densified graphene structure in polymer matrix is still challenging.Herein,we develop a graphene/waterborne polyurethane(G/WPU)flexible film with densified and ordered layer-structure for using as an EMI shielding material.By virtue of the polyvinylpyrrolidone modified strategy and facile liquid phase ball-milling treatment,the graphene nanosheets can be efficiently dispersed into the WPU substrate and tightly connected between each other via internal interactions.Benefiting from the relatively low defects and densified structure of graphene,the resultant G/WPU film yields a high electrical conductivity of 1,004.5 S/m,and a tensile strength of around 48.5 MPa.As a consequence,it achieves an average EMI shielding effectiveness of over 30 dB in the X-band with a thickness of merely 0.15 mm and the value is further enhanced to 73.4 dB at 0.9 mm with a low density of 1.4 g/cm^(3),offering over 99.99999%shielding of incident electromagnetic waves.More importantly,this G/WPU film also exhibits a high cross-plane thermal conductivity of about 1.13 W/(m·K).Thus,this work develops a high-performance EMI shielding material with both good capacity of heat transmission,but also provides a facile strategy for designing next-generation advanced,lightweight,flexible,and multifunction shielding materials.

关键词： electromagnetic interference shielding graphene densification flexible thermal conductivity

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Multiscale structure and interface engineering of Fe/Fe_(3)C in situ encapsulated in nitrogen-doped carbon for stable and efficient multi-band electromagnetic wave absorption

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Journal of Materials Science & Technology 2023年第27期158卷 9-20页

作者： Bo Jiang Wang Yang Hengxuan Bai Chen Zhang Siyuan Li Shaoxiong Du Ye Wang Li Sun Xiaobai Wang Yongfeng Li State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Changping 102249China Department of Materials Application Research AVIC Manufacturing Technology InstituteBeijing 100024China

Most reported electromagnetic wave absorption(EWA)materials show significant effective absorption in a certain frequency range,but their performances deteriorate dramatically as the frequency changes.As the range of working frequencies for electronic devices is gradually widening,it is of great interest to explore frequency-insensitive EWA materials that can achieve efficient absorption in every waveband by simply changing the absorption thickness.To this end,a multi-scale absorber(Fe/Fe_(3) C@NC)is rationally synthesized by chemical foaming and in-situ growth strategy.By controlling the growth of carbon nan-otubes,the Fe/Fe_(3) C@NC-2 exhibits a well-constructed 3D multi-scale architecture.Thanks to dipole po-larization,interface polarization and magnetic-dielectric energy conversion,the Fe/Fe_(3) C@NC-2 overcomes the frequency dispersion behavior and keeps a stable dielectric attenuation capability across the entire frequency range.Consequently,it delivers a superb full-band absorption of-50.1,-59.83,-55.87 and-51.91 dB in the S,C,X and Ku bands,respectively.The maximum radar cross-sectional reduction reaches 35.44 dB m^(-2) when the incidentθis 20°,testifying its impressive performance.Surprisingly,this EWA material also shows a remarkable resistance to oxidation and corrosion derived from the tightly coated carbon layers.This work provides new insight into the design of multi-band and stable EWA materials for practical application.

关键词： Multi-scale structure Heterogeneous interface Multiple bands Magnetic-dielectric composites Electromagnetic waves absorption

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鄂尔多斯盆地南梁西区上三叠统长6储层特征及影响因素分析

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地下水 2013年第3期35卷 196-200页

作者：赵天林李杪白雪晶齐恒玄西北大学地质学系大陆动力学国家重点实验室

通过研究区内大量铸体薄片、物性资料及压汞分析,对研究区长6油层组储层的岩石学特征、孔隙类型、孔隙结构及物性特征等进行深入研究,分析了影响储层储集性能的主要因素。研究表明,长6油层组储集层具成分成熟度较低、结构成熟度中等的... 详细信息

通过研究区内大量铸体薄片、物性资料及压汞分析,对研究区长6油层组储层的岩石学特征、孔隙类型、孔隙结构及物性特征等进行深入研究,分析了影响储层储集性能的主要因素。研究表明,长6油层组储集层具成分成熟度较低、结构成熟度中等的岩石学特点,储层孔隙类型以粒间溶孔、粒内溶孔及黑云母溶孔为主,微孔—细孔是主要的油气储集空间,细—微细喉道是长6储层的基本渗流通道,为典型的低孔、特低渗储层。储层物性受沉积相带、成岩作用和高频基准面旋回升降的控制。碎屑粒度和分选性对储层性能有重要影响;压实和胶结作用使储层物性明显变差,而黏土膜胶结、溶解作用对孔隙建造具有积极作用。在长6油层组共识别出正韵律、反韵律、均质韵律及凸韵律和凹韵律6种类型储层物性垂向分布模式,该模式受控于高频基准面旋回的升降。

关键词：储层特征控制因素长6油层组南梁西区鄂尔多斯盆地

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