The vigorous development of modern electronic communication demands multi-functional materials with exceptional electromagnetic interference(EMI)shielding.However,constructing lightweight and highly efficient metal-fr...The vigorous development of modern electronic communication demands multi-functional materials with exceptional electromagnetic interference(EMI)shielding.However,constructing lightweight and highly efficient metal-free carbon-based EMI shielding materials remains a huge challenge,particularly with robust EMI responses across a broadband frequency.Herein,a broadband(8-27 GHz)and strong EMI shielding response nitrogen-doped carbon plate(NCP)is constructed by a pressing and two-step pyroly-sis process.The layered stacking structure and N-doping impart extraordinary EMI shielding performance to the carbon plate,achieving EMI shielding effectiveness values of 82.60,95.44,and 104.12 dB in the X band,Ku band,and K band,respectively.Notably,the overall thickness of NCP was<1 mm.Moreover,the NCP exhibits remarkable joule heating performance with a low driving voltage(≤3 V)and a fast elec-trothermal response.This work enables the potential for the development of metal-free carbon materials with lightweight,highly efficient and broadband-strong EMI shielding performance.展开更多
Roll top formers are widely used for Fourdrinier paper machines,typically with a speed of less than 1200 m/min.In a roll top former,wet fiber web is dewatered by the extrusion force of two wires and the centrifugal fo...Roll top formers are widely used for Fourdrinier paper machines,typically with a speed of less than 1200 m/min.In a roll top former,wet fiber web is dewatered by the extrusion force of two wires and the centrifugal force of the roll.The present work focuses on the dewatering and forming mechanisms of roll top formers and the governing factors relevant to the structural characteristics of the formers.This study would provide usefull information for the design and applications of roll top formers in paper mills.展开更多
基金supported by the Guangdong Basic and Applied Basic Research Foundation(No.2023B1515040013).
文摘The vigorous development of modern electronic communication demands multi-functional materials with exceptional electromagnetic interference(EMI)shielding.However,constructing lightweight and highly efficient metal-free carbon-based EMI shielding materials remains a huge challenge,particularly with robust EMI responses across a broadband frequency.Herein,a broadband(8-27 GHz)and strong EMI shielding response nitrogen-doped carbon plate(NCP)is constructed by a pressing and two-step pyroly-sis process.The layered stacking structure and N-doping impart extraordinary EMI shielding performance to the carbon plate,achieving EMI shielding effectiveness values of 82.60,95.44,and 104.12 dB in the X band,Ku band,and K band,respectively.Notably,the overall thickness of NCP was<1 mm.Moreover,the NCP exhibits remarkable joule heating performance with a low driving voltage(≤3 V)and a fast elec-trothermal response.This work enables the potential for the development of metal-free carbon materials with lightweight,highly efficient and broadband-strong EMI shielding performance.
基金the Fundamental Research Funds for the State Key Lab of Pulp&Paper Engineering(Grant No.2016C04)Fundamental Research Funds for the Science and Technology project of Guangdong Province(Grant No.2016A020221040&Grant No.2013B010402010).
文摘Roll top formers are widely used for Fourdrinier paper machines,typically with a speed of less than 1200 m/min.In a roll top former,wet fiber web is dewatered by the extrusion force of two wires and the centrifugal force of the roll.The present work focuses on the dewatering and forming mechanisms of roll top formers and the governing factors relevant to the structural characteristics of the formers.This study would provide usefull information for the design and applications of roll top formers in paper mills.
