Inspired by the nature,lotus leaf-derived gradient hierarchical porous C/MoS2 morphology genetic composites(GHPCM)were successfully fabricated through an in situ strategy.The biological microstructure of lotus leaf wa...Inspired by the nature,lotus leaf-derived gradient hierarchical porous C/MoS2 morphology genetic composites(GHPCM)were successfully fabricated through an in situ strategy.The biological microstructure of lotus leaf was well preserved after treatment.Different pores with gradient pore sizes ranging from 300 to 5μm were hierarchically distributed in the composites.In addition,the surface states of lotus leaf resulted in the Janus-like morphologies of MoS2.The GHPCM exhibit excellent electromagnetic wave absorption performance,with the minimum reflection loss of−50.1 dB at a thickness of 2.4 mm and the maximum effective bandwidth of 6.0 GHz at a thickness of 2.2 mm.The outstanding performance could be attributed to the synergy of conductive loss,polarization loss,and impedance matching.In particularly,we provided a brand-new dielectric sum-quotient model to analyze the electromagnetic performance of the non-magnetic material system.It suggests that the specific sum and quotient of permittivity are the key to keep reflection loss below−10 dB within a certain frequency range.Furthermore,based on the concept of material genetic engineering,the dielectric constant could be taken into account to seek for suitable materials with designable electromagnetic absorption performance.展开更多
The rational construction of microstructure and composition with enhanced Maxwell-Wagner-Sillars effect(MWSE)is still a challenging direction for reinforcing electromagnetic wave(EMW)absorption performance,and the rel...The rational construction of microstructure and composition with enhanced Maxwell-Wagner-Sillars effect(MWSE)is still a challenging direction for reinforcing electromagnetic wave(EMW)absorption performance,and the related EMW attenuation mechanism has rarely been elucidated.Herein,MWSE boostedβ-chitin/carbon nano-onions/Ni–P composites is prepared according to the heterointerface engineering strategy via facile layer-by-layer electrostatic assembly and electroless plating techniques.The heterogeneous interface is reinforced from the aspect of porous skeleton,nanomaterials and multilayer construction.The composites exhibit competitive EMW response mechanism between the conductive loss and the polarization/magnetic loss,as describing like the story of“The Hare and the Tortoise”.As a result,the composites not only achieve a minimum reflection loss(RL_(min))of−50.83 dB and an effective bandwidth of 6.8 GHz,but also present remarkable EMW interference shielding effectiveness of 66.66 dB.In addition,diverse functions such as good thermal insulation,infrared shielding and photothermal performance were also achieved in the hybrid composites as a result of intrinsic morphology and chemicophysics properties.Therefore,we believe that the boosted MWSE open up a novel orientation toward developing multifunctional composites with high-efficient EMW response and thermal management.展开更多
Electromagnetic cooperative strategy has been presented as a mainstream approach that can effectively optimize the matching thickness of dielectric loss dominant system.However,it is still challenging for dielectric–...Electromagnetic cooperative strategy has been presented as a mainstream approach that can effectively optimize the matching thickness of dielectric loss dominant system.However,it is still challenging for dielectric–magnetic loss coexisting-type absorber to develop electromagnetic wave(EMW)performance with ultra-low matching thickness(≤1 mm).Breaking the limitation of traditional electromagnetic response at microscopic/mesoscopic scale,a ficus microcarpa-like magnetic aerogel with macroscopical electromagnetic cooperative effect was fabricated through highly oriented self-assembly engineering.The highly oriented Ni chains with unique macroscopic morphology(~1 cm in length)were achieved via a special magnetic field-induced growth.Strong magnetic coupling was observed in the Ni chains confirmed by the micromagnetic simulation.The deductive calculation validates that maintaining high value of electromagnetic parameters at high frequencies is the prerequisites of ultrathin absorber.The electromagnetic cooperative networks with uninterrupted and dual pathways spread through the entire aerogel skeleton,resulting in the impressive permittivity even at high frequencies.Consequently,the aerogel exhibits a remarkable EMW performance at an ultrathin thickness of 1 mm.Thus,based on the modulation of electromagnetic parameters,this work proposed a macroscopic ordered structure with the electromagnetic cooperative effect useful to develop a suitable strategy for achieving ultrathin EMW absorbers.展开更多
Myocarditis is an inflammatory disease of the cardiac muscle and one of the primary causes of dilated cardiomyopathy.Group B coxsackievirus(CVB)is one of the leading causative pathogens of viral myocarditis,which prim...Myocarditis is an inflammatory disease of the cardiac muscle and one of the primary causes of dilated cardiomyopathy.Group B coxsackievirus(CVB)is one of the leading causative pathogens of viral myocarditis,which primarily affects children and young adults.Due to the lack of vaccines,the development of antiviral medicines is crucial to controlling CVB infection and the progression of myocarditis.In this study,we investigated the antiviral effect of baicalein,a flavonoid extracted from Scutellaria baicaleinsis.Our results demonstrated that baicalein treatment significantly reduced cytopathic effect and increased cell viability in CVB3-infected cells.In addition,significant reductions in viral protein 3D,viral RNA,and viral particles were observed in CVB3-infected cells treated with baicalein.We found that baicalein exerted its inhibitory effect in the early stages of CVB3 infection.Baicalein also suppressed viral replication in the myocardium and effectively alleviated myocarditis induced by CVB3 infection.Our study revealed that baicalein exerts its antiviral effect by inhibiting the activity of caspase-1 and viral protease 2A.Taken together,our findings demonstrate that baicalein has antiviral activity against CVB3 infection and may serve as a potential therapeutic option for the myocarditis caused by enterovirus infection.展开更多
恶性中心气道狭窄(malignant central airway obstruction,MCAO)是指因原发或转移的恶性肿瘤侵及气管、隆突、左右主支气管或右中间支气管引起的管腔狭窄[1];患者会出现不同程度的呼吸困难,严重者可导致窒息、甚至危及生命。按照中心气...恶性中心气道狭窄(malignant central airway obstruction,MCAO)是指因原发或转移的恶性肿瘤侵及气管、隆突、左右主支气管或右中间支气管引起的管腔狭窄[1];患者会出现不同程度的呼吸困难,严重者可导致窒息、甚至危及生命。按照中心气道病变位置将MCAO分为管内型、管壁型、管外型和混合型[2]。管外型和混合型MCAO的瘤体组织可向管腔外生长并侵及纵隔结构;由于上腔静脉具有管壁薄、内部血流压力低的特点,因此一旦上纵隔受到肿瘤侵犯,就容易导致上腔静脉受压,出现头痛、头晕、颜面部水肿和呼吸困难等上腔静脉综合征(superior vena cava syndrome,SVCS)表现。对于MCAO,支气管镜下气道消瘤和/或气道支架置入术可以快速缓解呼吸困难[3,4];对于恶性肿瘤所致SVCS则可通过血管腔内支架置入术来缓解症状[5]。然而,晚期肺癌同时侵及中心气道和上腔静脉导致MCAO合并SVCS的病例罕见报道,其治疗方法亦无统一共识。现报道我科气道支架和上腔静脉支架联合置入治疗晚期非小细胞肺癌导致中心气道狭窄和上腔静脉综合征1例,效果满意,以供临床借鉴。展开更多
Considering a series of electromagnetic pollution problems brought by the development of electronic communication technology,more attention has been paid to the research of electromagnetic wave(EMW)absorbing materials...Considering a series of electromagnetic pollution problems brought by the development of electronic communication technology,more attention has been paid to the research of electromagnetic wave(EMW)absorbing materials with unique composition and structure.Herein,under the inspiration of mixeddimensional hierarchical structure,2D Ni_(2)P nanosheets anchored on 1D silk-derived carbon fiber is successfully fabricated as a gratifying resistor-dielectric type absorber.By a controllable pyrolyzation strategy and disproportionated reaction,high-density 2D Ni_(2)P nanosheets were grown vertically and cross-linked on the surface of 1D silk-derived carbon fiber.The sample exhibited superior EMW absorption performance with maximum reflection loss value of–56.9 d B at the thickness of 2.32 mm and the effective absorption bandwidth can reach to 7.2 GHz at the thickness of 1.93 mm.In addition,the pure Ni_(2)P shows remarkable dielectric characteristic and EMW absorption ability as well.The integration of dualconductive loss,enhanced polarization relaxation loss and the multiple scattering in the composites was proved to contribute to the good EMW absorption performance.Therefore,this work confirms the great potentials of Ni_(2)P as a high-efficient EMW absorbing materials and light a new way in construction of multidimensional absorber.展开更多
Stimuli-responsive materials with switchable wettability have promising practical applications in oil/water separation.A novel CO_(2)-responsive cotton fabric for controlled oil/water separation was fabricated based o...Stimuli-responsive materials with switchable wettability have promising practical applications in oil/water separation.A novel CO_(2)-responsive cotton fabric for controlled oil/water separation was fabricated based on mussel-inspired reaction and polymerized with 2-(dimethylamino)ethyl methacrylate(DMAEMA).As expected,the modified fabric exhibited switchable hydrophilicity and hydrophobicity after CO_(2)/N_(2) alternation,and it could be used for gravity-driven CO_(2)-controlled oil/water separation.Water was selectively penetrated through the fabric and separated from oil after treating by CO_(2).A reversed wettability could be generated through simply treated with N2.It is expected that the as-prepared fabrics could be applied in smart oil/water separation due to the attractive properties of CO_(2)-switchable system.展开更多
基金This project was supported by the National Natural Science Foundation of China(Nos.51971162,U1933112,51671146)the Program of Shanghai Technology Research Leader(18XD1423800)the Fundamental Research Funds for the Central Universities(22120180096).
文摘Inspired by the nature,lotus leaf-derived gradient hierarchical porous C/MoS2 morphology genetic composites(GHPCM)were successfully fabricated through an in situ strategy.The biological microstructure of lotus leaf was well preserved after treatment.Different pores with gradient pore sizes ranging from 300 to 5μm were hierarchically distributed in the composites.In addition,the surface states of lotus leaf resulted in the Janus-like morphologies of MoS2.The GHPCM exhibit excellent electromagnetic wave absorption performance,with the minimum reflection loss of−50.1 dB at a thickness of 2.4 mm and the maximum effective bandwidth of 6.0 GHz at a thickness of 2.2 mm.The outstanding performance could be attributed to the synergy of conductive loss,polarization loss,and impedance matching.In particularly,we provided a brand-new dielectric sum-quotient model to analyze the electromagnetic performance of the non-magnetic material system.It suggests that the specific sum and quotient of permittivity are the key to keep reflection loss below−10 dB within a certain frequency range.Furthermore,based on the concept of material genetic engineering,the dielectric constant could be taken into account to seek for suitable materials with designable electromagnetic absorption performance.
基金This work was supported by the National Key Research and Development Program of China(Grant No.2019YFE0122900)the National Natural Science Foundation of China(No 51971162,U1933112,51671146)+1 种基金China Postdoctoral Science Foundation(Grant No.2020M671208)Open access funding provided by Shanghai Jiao Tong University
文摘The rational construction of microstructure and composition with enhanced Maxwell-Wagner-Sillars effect(MWSE)is still a challenging direction for reinforcing electromagnetic wave(EMW)absorption performance,and the related EMW attenuation mechanism has rarely been elucidated.Herein,MWSE boostedβ-chitin/carbon nano-onions/Ni–P composites is prepared according to the heterointerface engineering strategy via facile layer-by-layer electrostatic assembly and electroless plating techniques.The heterogeneous interface is reinforced from the aspect of porous skeleton,nanomaterials and multilayer construction.The composites exhibit competitive EMW response mechanism between the conductive loss and the polarization/magnetic loss,as describing like the story of“The Hare and the Tortoise”.As a result,the composites not only achieve a minimum reflection loss(RL_(min))of−50.83 dB and an effective bandwidth of 6.8 GHz,but also present remarkable EMW interference shielding effectiveness of 66.66 dB.In addition,diverse functions such as good thermal insulation,infrared shielding and photothermal performance were also achieved in the hybrid composites as a result of intrinsic morphology and chemicophysics properties.Therefore,we believe that the boosted MWSE open up a novel orientation toward developing multifunctional composites with high-efficient EMW response and thermal management.
基金supported by the National Key Research and Development Program of China (Grant No. 2019YFE0122900)the National Natural Science Foundation of China (No 51971162, U1933112, 51671146)China Postdoctoral Science Foundation (Grant No. 2020M671208)
文摘Electromagnetic cooperative strategy has been presented as a mainstream approach that can effectively optimize the matching thickness of dielectric loss dominant system.However,it is still challenging for dielectric–magnetic loss coexisting-type absorber to develop electromagnetic wave(EMW)performance with ultra-low matching thickness(≤1 mm).Breaking the limitation of traditional electromagnetic response at microscopic/mesoscopic scale,a ficus microcarpa-like magnetic aerogel with macroscopical electromagnetic cooperative effect was fabricated through highly oriented self-assembly engineering.The highly oriented Ni chains with unique macroscopic morphology(~1 cm in length)were achieved via a special magnetic field-induced growth.Strong magnetic coupling was observed in the Ni chains confirmed by the micromagnetic simulation.The deductive calculation validates that maintaining high value of electromagnetic parameters at high frequencies is the prerequisites of ultrathin absorber.The electromagnetic cooperative networks with uninterrupted and dual pathways spread through the entire aerogel skeleton,resulting in the impressive permittivity even at high frequencies.Consequently,the aerogel exhibits a remarkable EMW performance at an ultrathin thickness of 1 mm.Thus,based on the modulation of electromagnetic parameters,this work proposed a macroscopic ordered structure with the electromagnetic cooperative effect useful to develop a suitable strategy for achieving ultrathin EMW absorbers.
基金supported by the National Natural Science Foundation of China(82172247 and 81971920 to WZ,82072278 to ZZ,and 82202493 to LL,82302502 to Yao Wang)Natural Science Foundation of Heilongjiang Province of China(YQ2023H003)+1 种基金China Postdoctoral Science Foundation(2021M693818)Heilongjiang Postdoctoral Fund,Heilongjiang Province of China(LBH-Z21023).
文摘Myocarditis is an inflammatory disease of the cardiac muscle and one of the primary causes of dilated cardiomyopathy.Group B coxsackievirus(CVB)is one of the leading causative pathogens of viral myocarditis,which primarily affects children and young adults.Due to the lack of vaccines,the development of antiviral medicines is crucial to controlling CVB infection and the progression of myocarditis.In this study,we investigated the antiviral effect of baicalein,a flavonoid extracted from Scutellaria baicaleinsis.Our results demonstrated that baicalein treatment significantly reduced cytopathic effect and increased cell viability in CVB3-infected cells.In addition,significant reductions in viral protein 3D,viral RNA,and viral particles were observed in CVB3-infected cells treated with baicalein.We found that baicalein exerted its inhibitory effect in the early stages of CVB3 infection.Baicalein also suppressed viral replication in the myocardium and effectively alleviated myocarditis induced by CVB3 infection.Our study revealed that baicalein exerts its antiviral effect by inhibiting the activity of caspase-1 and viral protease 2A.Taken together,our findings demonstrate that baicalein has antiviral activity against CVB3 infection and may serve as a potential therapeutic option for the myocarditis caused by enterovirus infection.
基金financially supported by the National Natural Science Foundation of China(Nos.51971162,U1933112,51671146)the Program of Shanghai Technology Research Leader(No.18XD1423800)the Fundamental Research Funds for the Central Universities(No.22120180096)。
文摘Considering a series of electromagnetic pollution problems brought by the development of electronic communication technology,more attention has been paid to the research of electromagnetic wave(EMW)absorbing materials with unique composition and structure.Herein,under the inspiration of mixeddimensional hierarchical structure,2D Ni_(2)P nanosheets anchored on 1D silk-derived carbon fiber is successfully fabricated as a gratifying resistor-dielectric type absorber.By a controllable pyrolyzation strategy and disproportionated reaction,high-density 2D Ni_(2)P nanosheets were grown vertically and cross-linked on the surface of 1D silk-derived carbon fiber.The sample exhibited superior EMW absorption performance with maximum reflection loss value of–56.9 d B at the thickness of 2.32 mm and the effective absorption bandwidth can reach to 7.2 GHz at the thickness of 1.93 mm.In addition,the pure Ni_(2)P shows remarkable dielectric characteristic and EMW absorption ability as well.The integration of dualconductive loss,enhanced polarization relaxation loss and the multiple scattering in the composites was proved to contribute to the good EMW absorption performance.Therefore,this work confirms the great potentials of Ni_(2)P as a high-efficient EMW absorbing materials and light a new way in construction of multidimensional absorber.
基金The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China(Grant no.51703130)Zhejiang Provincial Natural Science Foundation of China(Grant no.LY18E080018)+1 种基金Shaoxing Public Welfare Project(Grant no.2017B70042)the International Science and Technology Cooperation Project of Shaoxing University(Grant no.2019LGGH1004).
文摘Stimuli-responsive materials with switchable wettability have promising practical applications in oil/water separation.A novel CO_(2)-responsive cotton fabric for controlled oil/water separation was fabricated based on mussel-inspired reaction and polymerized with 2-(dimethylamino)ethyl methacrylate(DMAEMA).As expected,the modified fabric exhibited switchable hydrophilicity and hydrophobicity after CO_(2)/N_(2) alternation,and it could be used for gravity-driven CO_(2)-controlled oil/water separation.Water was selectively penetrated through the fabric and separated from oil after treating by CO_(2).A reversed wettability could be generated through simply treated with N2.It is expected that the as-prepared fabrics could be applied in smart oil/water separation due to the attractive properties of CO_(2)-switchable system.
