Planar Na ion micro-supercapacitors(NIMSCs) that offer both high energy density and power density are deemed to a promising class of miniaturized power sources for wearable and portable microelectron-ics. Nevertheless...Planar Na ion micro-supercapacitors(NIMSCs) that offer both high energy density and power density are deemed to a promising class of miniaturized power sources for wearable and portable microelectron-ics. Nevertheless, the development of NIMSCs are hugely impeded by the low capacity and sluggish Na ion kinetics in the negative electrode.Herein, we demonstrate a novel carbon-coated Nb_(2)O_5 microflower with a hierarchical structure composed of vertically intercrossed and porous nanosheets, boosting Na ion storage performance. The unique structural merits, including uniform carbon coating, ultrathin nanosheets and abun-dant pores, endow the Nb_(2)O_5 microflower with highly reversible Na ion storage capacity of 245 mAh g^(-1) at 0.25 C and excellent rate capability.Benefiting from high capacity and fast charging of Nb_(2)O_5 microflower, the planar NIMSCs consisted of Nb_(2)O_5 negative electrode and activated car-bon positive electrode deliver high areal energy density of 60.7 μWh cm^(-2),considerable voltage window of 3.5 V and extraordinary cyclability. Therefore, this work exploits a structural design strategy towards electrode materials for application in NIMSCs, holding great promise for flexible microelectronics.展开更多
Synthesis of new carbon nanostructures with tunable properties is vital for precisely regulating electrochemical performance in the wide applications.Herein,we report a novel approach for the oxidative polymerization ...Synthesis of new carbon nanostructures with tunable properties is vital for precisely regulating electrochemical performance in the wide applications.Herein,we report a novel approach for the oxidative polymerization of N-and P-bearing copolymers from the self-assembly of three different monomers(aniline,pyrrole,and phytic acid),and further prepare the respective carbon nanostructures with relatively consistent N dopant(6.2%–8.0%,atom)and varying P concentrations(0.4%–2.8%,atom)via controllable pyrolysis.The impacts of phytic acid addition on the compositional,structural,and morphological evolution of the copolymers and the resulting nanocarbons are well studied through a spectrum of characterizations including N2 sorption,Fourier transform infrared spectroscopy,gel permeation chromatograph,scanning/transmission electron microscopy,and X-ray photoelectron spectroscopy.Gradual fragmentation of the nanosphere structures is evidenced with increasing addition of phytic acid,leading to different nanostructures from hollow nanospheres to 3D aggregates.Nanocarbons decorated with N and P dopants from pyrolysis are further utilized as anode materials in lithium-ion batteries,demonstrating enhanced electrochemical performance,i.e.,a reversible capacity of 380 mAhg^(-1)at 2 Ag^(-1)for NPC-0.5 during 200 cycles.The superior performance originates from the balanced porosity,and appropriate concentrations of P and pyrrolic N,thus pointing the direction for designing high-performance anode materials.展开更多
With the rapid development of integrated and miniaturized electronics,the planar energy storage devices with high capacitance and energy density are in enormous demand.Hence,the advanced manufacture and fast fabricati...With the rapid development of integrated and miniaturized electronics,the planar energy storage devices with high capacitance and energy density are in enormous demand.Hence,the advanced manufacture and fast fabrication of microscale planar energy units are of great significance.Herein,we develop aqueous planar micro-supercapacitors(MSCs) with ultrahigh areal capacitance and energy density via an efficient all-3 D-printing strategy,which can directly extrude the active material ink and gel electrolyte onto the substrate to prepare electrochemical energy storage devices.Both the printed active carbon/exfoliated graphene(AC/EG) electrode ink and electrolyte gel are highly processable with outstanding conductivity(~97 S cm^(-1) of electrode;-34.8 mS cm^(-1) of electrolyte),thus benefiting the corresponding shaping and electrochemical performances.Furthermore,the 3 D-printed symmetric MSCs can be operated stably at a high voltage up to 2.0 V in water-in-salt gel electrolyte,displaying ultrahigh areal capacitance of2381 mF cm^(-2) and exceptional energy density of 331 μWh cm^(-2),superior to previous printed micro energy units.In addition,we can further tailor the integrated 3 D-printed MSCs in parallel and series with various voltage and current outputs,enabling metal-free interconnection.Therefore,our all-3 D-printed MSCs place a great potential in developing high-power micro-electronics fabrication and integration.展开更多
Background:Multiple mitochondrial dysfunction syndromes(MMDS)presents as complex mitochondrial damage,thus impairing a variety of metabolic pathways.Heart dysplasia has been reported in MMDS patients;however,the speci...Background:Multiple mitochondrial dysfunction syndromes(MMDS)presents as complex mitochondrial damage,thus impairing a variety of metabolic pathways.Heart dysplasia has been reported in MMDS patients;however,the specific clinical symptoms and pathogenesis remain unclear.More urgently,there is a lack of an animal model to aid research.Therefore,we selected a reported MMDS causal gene,Isca1,and established an animal model of MMDS complicated with cardiac dysplasia.Methods:The myocardium-specific Isca1 knockout heterozygote(Isca1 HET)rat was obtained by crossing the Isca1 conditional knockout(Isca1 cKO)rat with theαmyosin heavy chain Cre(α-MHC-Cre)rat.Cardiac development characteristics were determined by ECG,blood pressure measurement,echocardiography and histopatho-logical analysis.The responsiveness to pathological stimuli were observed through adriamycin treatment.Mitochondria and metabolism disorder were determined by activity analysis of mitochondrial respiratory chain complex and ATP production in myocardium.Results:ISCA1 expression in myocardium exhibited a semizygous effect.Isca1 HET rats exhibited dilated cardiomyopathy characteristics,including thin-walled ventri-cles,larger chambers,cardiac dysfunction and myocardium fibrosis.Downregulated ISCA1 led to deteriorating cardiac pathological processes at the global and organiza-tional levels.Meanwhile,HET rats exhibited typical MMDS characteristics,including damaged mitochondrial morphology and enzyme activity for mitochondrial respira-tory chain complexesⅠ,ⅡandⅣ,and impaired ATP production.Conclusion:We have established a rat model of MMDS complicated with cardiomyopathy,it can also be used as model of myocardial energy metabolism dysfunction and mitochondrial cardiomyopathy.This model can be applied to the study of the mechanism of energy metabolism in cardiovascular diseases,as well as research and development of drugs.展开更多
Developing highly efficient microwave absorbing materials(MAMs)to ameliorate the electromagnetic(EM)response and facilitate energy absorption is crucial in both the civil and military industries.Metal-organic framewor...Developing highly efficient microwave absorbing materials(MAMs)to ameliorate the electromagnetic(EM)response and facilitate energy absorption is crucial in both the civil and military industries.Metal-organic framework(MOF)derived nanoporous carbon composites have emerged as advanced MAMs ow-ing to their rich porosity,tunable compositions,facile functionalization,and morphology diversity.To-gether with the flourishing development of composition-tuning strategy,the rational dimension design and elaborate control over the architectures have also evolved into an effective approach to regulating their EM properties.Herein,we provide a comprehensive review of the recent advances in using di-mension and morphology modulation to adjust the microwave attenuation capacities for MOF-derived carbon composites.The underlying design rules and unique advantages for the MAMs of various dimen-sions were discussed with the selection of representative work,providing general concepts and insight on how to efficiently tune the morphologies.Accordingly,the fundamental dimension-morphology-function relationship was also elucidated.Finally,the challenges and perspectives of dimension design and mor-phology control over MOF-derived MAMs were also presented.展开更多
Over one hundred arthropod fossil species have been described from the famous Chengjiang Lagerst?tte(South China, Cambrian Stage 3, ca. 518 Ma) including a diverse assemblage of radiodonts–a group containing Anomaloc...Over one hundred arthropod fossil species have been described from the famous Chengjiang Lagerst?tte(South China, Cambrian Stage 3, ca. 518 Ma) including a diverse assemblage of radiodonts–a group containing Anomalocaris and its relatives. These iconic stem-group euarthropods include some of the largest animals of the time, and some are known from hundreds of specimens. A longstanding conundrum has been the rarity or absence of hurdiids from Cambrian Series 2 Lagerst?tten like Chengjiang. This is because radiodonts are generally common in such deposits and the oldest radiodont ever discovered is a hurdiid. Furthermore, this family displays the widest geographic and temporal ranges of all radiodont families, and the highest diversity. Here we document the first hurdiid frontal appendages from Chengjiang, which display unique features within the family and may provide insights for understanding the character evolution of hurdiid appendages. The palaeoenvironmental distribution of hurdiids suggests that the rarity of hurdiids in Chengjiang may be due to a preference for deeper water environments,and the later success of this family from the Wuliuan onwards may relate to their ability to tolerate cooler water temperatures than other radiodont families. The palaeogeographical, palaeoenvironmental, and stratigraphical patterns observed in hurdiids maybe caused in part by the limited distributions of Konservat-Lagerst?tten in the Cambrian as well.展开更多
The escalating demand for micro/nano-sized devices,such as micro/nano-robots,intelligent portable/wearable microsystems,and implantable medical microdevices,necessitates the expeditious development of integrated micro...The escalating demand for micro/nano-sized devices,such as micro/nano-robots,intelligent portable/wearable microsystems,and implantable medical microdevices,necessitates the expeditious development of integrated microsystems incorporating energy conversion,storage,and consumption.Critical bottlenecks in microscale energy storage/sensors and their integrated systems are being addressed by exploring new technologies and new materials,e.g.,MXene,holding great potential for developing lightweight and deformable integrated microdevices.This review summarizes the latest progress and milestones in the realization of MXene-based micro-supercapacitors(MSCs)and sensor arrays,and thus discusses the design fundamentals and key advancements of MXene-based energy conversion-storageconsumption integrated microsystems.Finally,we outline the key challenges in fabricating MXenebased MSCs/sensors and their self-powered integrated microsystems,which is crucial for their practical applications.Particularly,we illuminate viable solutions to such unsolved issues and highlight the exciting opportunities.展开更多
All-inorganic CsPbX_(3)(X=Cl,Br,I)perovskite nanocrystals(NCs)are emerging as promising candidate materials for optoelectronic devices due to their splendid optical and electrical properties.However,the intrinsic inst...All-inorganic CsPbX_(3)(X=Cl,Br,I)perovskite nanocrystals(NCs)are emerging as promising candidate materials for optoelectronic devices due to their splendid optical and electrical properties.However,the intrinsic instability greatly limits their practical application.Herein,a feasible strategy is proposed for fabricating highly stable and luminescent CsPbBr_(3)@PVDF-HFP/PS nanofibers by combining one-step electrospinning method with 1H,1H,2H,2H-perfluorodecyltrimethoxysi-lane(PFDTMS)-assisted post-treatment.The bright-emitting CsPbBr_(3) NCs can be effectively encapsulated within polymer nanofibers,which exhibit ultrafine diameter of only 88.1±2.8 nm and high photoluminescence quantum yield(PLQY)of 87.9%via rationally optimizing the electrospinning parameters,concentration of perovskite precursors and ligands.Most importantly,the superhydrophobic surface structures of nanofibers are formed by the hydrolysis and condensation of PFDTMS under moist environment.Benefiting from the double effective protection of polymer matrices and hydrophobic PFDTMS oligomers against moisture erosion,the CsPbBr_(3)@PVDF-HFP/PS nanofibers present an obviously improved stability,which can retain 90%initial PL intensity after water immersion for 70 days.Furthermore,an efficient white light-emitting diode with wide color gamut covering 117%of National Television System Committee(NTSC)standard is successfully fabricated based on the composite nanofiber membranes,suggesting their promising prospect for solid-state lighting and display applications.展开更多
The X band(8 GHz-12 GHz)is the electromagnetic wave band emitted by most electronic instruments in our life,which will cause electromagnetic pollution harm to human health.Due to the coexistence of magnetic loss and d...The X band(8 GHz-12 GHz)is the electromagnetic wave band emitted by most electronic instruments in our life,which will cause electromagnetic pollution harm to human health.Due to the coexistence of magnetic loss and dielectric loss,the modified Fe_(3)O_(4)-carbon-based nanomaterial exhibit strong electromagnetic(EM)wave absorptive capacity.However,there is a problem that the effective absorption bandwidth(EAB,the frequency bandwidth of reflection loss is less than-10 dB)of the X band is narrow.Increasing the EAB value of Fe_(3)O_(4)-carbon-based materials is of great significance for reducing electromagnetic pollution.Here,an emulsion-based self-assembly technique and ligand carbonization treatment have been used to construct the Fe_(3)O_(4)@C supraparticles for the evaluation of EM performance.The Fe_(3)O_(4)@C supraparticles exhibit excellent EM absorption properties,which can achieve full coverage of X band from 6.52 GHz to 12.9 GHz at a sample thickness of 3 mm.Besides,the optimum EAB value of Fe_(3)O_(4)@C supraparticles is up to 8.55 GHz from 9 to 18 GHz at a sample thickness of 2.5 mm.The Fe_(3)O_(4)@C supraparticles with superlattice structure will have potential development prospects in the application of broadband absorption.展开更多
目的:回顾性比较伴与不伴急性上消化道出血(AUGIB)或急性食管静脉曲张出血(AEVB)的肝硬化患者止血/凝血指标的差异,包括血小板计数(PLT)、凝血酶原时间(PT)、国际标准化比率(INR)和活化部分凝血活酶时间(APTT)。方法:2012年1月至2014年...目的:回顾性比较伴与不伴急性上消化道出血(AUGIB)或急性食管静脉曲张出血(AEVB)的肝硬化患者止血/凝血指标的差异,包括血小板计数(PLT)、凝血酶原时间(PT)、国际标准化比率(INR)和活化部分凝血活酶时间(APTT)。方法:2012年1月至2014年6月间,共计1734例肝硬化患者纳入研究。根据其病史分为AUGIB组(497例)和无AUGIB组(1237例);同时根据内镜检查结果分为AEVB组(297例)和无AEVB组(1259例),另178例AUGIB患者由于缺乏内镜资料,既未入AEVB组,也未归入无AEVB组。结果:AUGIB组与无AUGIB组患者相比,PLT(99.99±89.90 vs 101.47±83.03,P=0.734)和APTT(42.96±15.20 vs 43.77±11.01,P=0.219)的差异无统计学意义,但PT显著延长(17.30±5.62 vs 16.03±4.68,P<0.001),INR显著增高(1.45±0.69 vs 1.31±0.59,P<0.001)。PT可以独立预测AUGIB的发生,PT越低,AUGIB出现的可能性越小(OR=0.968,95%CI:0.942-0.994)。AEVB组与无AEVB组患者相比,PLT显著减少(86.87±62.14 vs 101.74±83.62,P=0.004),APTT显著缩短(40.98±7.98 vs 43.72±10.97,P<0.001),但PT(16.53±3.71 vs 16.0464.68,P=0.088)和INR(1.35±0.41 vs 1.3160.59,P=0.225)的差异则无统计学意义。PLT可独立预测AEVB的发生,PLT越高,AEVB出现的可能性越大(OR=1.004,95%CI:1.002-1.006)。结论:PLT与肝硬化患者门脉高压出血密切相关。展开更多
Ultracompact and customizable micro-supercapacitors(MSCs)are highly demanded for powering microscale electronics of 5G and Internet of Things technologies.So far,tremendous efforts have been concentrated on fabricatin...Ultracompact and customizable micro-supercapacitors(MSCs)are highly demanded for powering microscale electronics of 5G and Internet of Things technologies.So far,tremendous efforts have been concentrated on fabricating high-performance MSCs;however,compatible fabrication and monolithic integration of MSCs with microelectronic systems still remains a huge challenge taking into full consideration the factors such as electrode film fabrication,high-resolution microelectrode pattern,and electrolyte precise deposition.In this review,we summarize the recent advances of ultrasmall and integrated MSCs with tunable performance and customizable function,including key microfabrication technologies for patterning microelectrodes with superior resolution,precise deposition of customized electrolytes in an extremely small space,and feasible strategies for improving electrochemical performance by constructing thick microelectrodes and special electrode structure.Finally,the related challenges and key prospects of ultracompact and customizable MSCs,including compatible microfabrication methods for electrode materials and films,patterning microelectrodes,customizing shape-conformable electrolytes,performance optimization,and efficient integration with microelectronic systems,are put forward for further promoting their practical application.展开更多
基金financially supported by the National Natural Science Foundation of China (Grants. 22075279, 22279137, 22125903, 22109040)National Key R&D Program of China (Grant 2022YFA1504100)+2 种基金Dalian Innovation Support Plan for High Level Talents (2019RT09)Dalian National Labo- ratory For Clean Energy (DNL), CAS, DNL Cooperation Fund, CAS (DNL202016, DNL202019), DICP (DICP I2020032)the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy (YLU-DNL Fund 2021002, YLU- DNL Fund 2021009)。
文摘Planar Na ion micro-supercapacitors(NIMSCs) that offer both high energy density and power density are deemed to a promising class of miniaturized power sources for wearable and portable microelectron-ics. Nevertheless, the development of NIMSCs are hugely impeded by the low capacity and sluggish Na ion kinetics in the negative electrode.Herein, we demonstrate a novel carbon-coated Nb_(2)O_5 microflower with a hierarchical structure composed of vertically intercrossed and porous nanosheets, boosting Na ion storage performance. The unique structural merits, including uniform carbon coating, ultrathin nanosheets and abun-dant pores, endow the Nb_(2)O_5 microflower with highly reversible Na ion storage capacity of 245 mAh g^(-1) at 0.25 C and excellent rate capability.Benefiting from high capacity and fast charging of Nb_(2)O_5 microflower, the planar NIMSCs consisted of Nb_(2)O_5 negative electrode and activated car-bon positive electrode deliver high areal energy density of 60.7 μWh cm^(-2),considerable voltage window of 3.5 V and extraordinary cyclability. Therefore, this work exploits a structural design strategy towards electrode materials for application in NIMSCs, holding great promise for flexible microelectronics.
基金support from Zhejiang Normal University(YS304320035,YS304320036)the National Key Research and Development Program of China(2016YFB0100100,2016YFA0200200)+5 种基金the National Natural Science Foundation of China(51872283,22075279,21805273,22005297,22005298)the Liaoning Revitalization Talents Program(XLYC1807153)the Funds for Local Science and Technology Development by the Central Government of Liaoning Province(2021JH6/10500112)Dalian Innovation Support Plan for High Level Talents(2019RT09)Dalian National Laboratory For Clean Energy(DNL),CAS,DNL Cooperation Fund,CAS(DNL201912,DNL201915)DICP(DICP ZZBS201708,DICP ZZBS201802,DICP I2020032).
文摘Synthesis of new carbon nanostructures with tunable properties is vital for precisely regulating electrochemical performance in the wide applications.Herein,we report a novel approach for the oxidative polymerization of N-and P-bearing copolymers from the self-assembly of three different monomers(aniline,pyrrole,and phytic acid),and further prepare the respective carbon nanostructures with relatively consistent N dopant(6.2%–8.0%,atom)and varying P concentrations(0.4%–2.8%,atom)via controllable pyrolysis.The impacts of phytic acid addition on the compositional,structural,and morphological evolution of the copolymers and the resulting nanocarbons are well studied through a spectrum of characterizations including N2 sorption,Fourier transform infrared spectroscopy,gel permeation chromatograph,scanning/transmission electron microscopy,and X-ray photoelectron spectroscopy.Gradual fragmentation of the nanosphere structures is evidenced with increasing addition of phytic acid,leading to different nanostructures from hollow nanospheres to 3D aggregates.Nanocarbons decorated with N and P dopants from pyrolysis are further utilized as anode materials in lithium-ion batteries,demonstrating enhanced electrochemical performance,i.e.,a reversible capacity of 380 mAhg^(-1)at 2 Ag^(-1)for NPC-0.5 during 200 cycles.The superior performance originates from the balanced porosity,and appropriate concentrations of P and pyrrolic N,thus pointing the direction for designing high-performance anode materials.
基金financially supported by the National Key R@D Program of China (2016YFB0100100, 2016YFA0200200)the National Natural Science Foundation of China (51872283,22075279, 21805273, 22005297, 22005298)+7 种基金the Liao Ning Revitalization Talents Program (XLYC1807153)the Central Government of Liaoning Province Guides The Funds for Local Science and Technology Development (2021JH6/10500112)the Dalian Innovation Support Plan for High Level Talents (2019RT09)the Dalian National Laboratory For Clean Energy (DNL),CASDNL Cooperation Fund,CAS (DNL201912, DNL201915, DNL202016, DNL202019)DICP (DICP ZZBS201708, DICP ZZBS201802, DICP I2020032)the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy (YLU-DNL Fund 2021002)the China Postdoctoral Science Foundation (2019 M661141, 2020 M680995)。
文摘With the rapid development of integrated and miniaturized electronics,the planar energy storage devices with high capacitance and energy density are in enormous demand.Hence,the advanced manufacture and fast fabrication of microscale planar energy units are of great significance.Herein,we develop aqueous planar micro-supercapacitors(MSCs) with ultrahigh areal capacitance and energy density via an efficient all-3 D-printing strategy,which can directly extrude the active material ink and gel electrolyte onto the substrate to prepare electrochemical energy storage devices.Both the printed active carbon/exfoliated graphene(AC/EG) electrode ink and electrolyte gel are highly processable with outstanding conductivity(~97 S cm^(-1) of electrode;-34.8 mS cm^(-1) of electrolyte),thus benefiting the corresponding shaping and electrochemical performances.Furthermore,the 3 D-printed symmetric MSCs can be operated stably at a high voltage up to 2.0 V in water-in-salt gel electrolyte,displaying ultrahigh areal capacitance of2381 mF cm^(-2) and exceptional energy density of 331 μWh cm^(-2),superior to previous printed micro energy units.In addition,we can further tailor the integrated 3 D-printed MSCs in parallel and series with various voltage and current outputs,enabling metal-free interconnection.Therefore,our all-3 D-printed MSCs place a great potential in developing high-power micro-electronics fabrication and integration.
基金The present work was supported in part by the Beijing Natural Science Foundation(5212017)CAMS Innovation Fund for Medical Sciences(CIFMS,2016-I2M-1-015)National Natural Science Foundation(31872314 and 31970508).
文摘Background:Multiple mitochondrial dysfunction syndromes(MMDS)presents as complex mitochondrial damage,thus impairing a variety of metabolic pathways.Heart dysplasia has been reported in MMDS patients;however,the specific clinical symptoms and pathogenesis remain unclear.More urgently,there is a lack of an animal model to aid research.Therefore,we selected a reported MMDS causal gene,Isca1,and established an animal model of MMDS complicated with cardiac dysplasia.Methods:The myocardium-specific Isca1 knockout heterozygote(Isca1 HET)rat was obtained by crossing the Isca1 conditional knockout(Isca1 cKO)rat with theαmyosin heavy chain Cre(α-MHC-Cre)rat.Cardiac development characteristics were determined by ECG,blood pressure measurement,echocardiography and histopatho-logical analysis.The responsiveness to pathological stimuli were observed through adriamycin treatment.Mitochondria and metabolism disorder were determined by activity analysis of mitochondrial respiratory chain complex and ATP production in myocardium.Results:ISCA1 expression in myocardium exhibited a semizygous effect.Isca1 HET rats exhibited dilated cardiomyopathy characteristics,including thin-walled ventri-cles,larger chambers,cardiac dysfunction and myocardium fibrosis.Downregulated ISCA1 led to deteriorating cardiac pathological processes at the global and organiza-tional levels.Meanwhile,HET rats exhibited typical MMDS characteristics,including damaged mitochondrial morphology and enzyme activity for mitochondrial respira-tory chain complexesⅠ,ⅡandⅣ,and impaired ATP production.Conclusion:We have established a rat model of MMDS complicated with cardiomyopathy,it can also be used as model of myocardial energy metabolism dysfunction and mitochondrial cardiomyopathy.This model can be applied to the study of the mechanism of energy metabolism in cardiovascular diseases,as well as research and development of drugs.
基金supported by t he Shanghai Science&Tech-nology Committee(No.22ZR1403300)the Fundamental Research Funds for the Central Universities(No.2232020A-02)the Na-tional Natural Science Foundation of China(Nos.51871053 and 91963204).
文摘Developing highly efficient microwave absorbing materials(MAMs)to ameliorate the electromagnetic(EM)response and facilitate energy absorption is crucial in both the civil and military industries.Metal-organic framework(MOF)derived nanoporous carbon composites have emerged as advanced MAMs ow-ing to their rich porosity,tunable compositions,facile functionalization,and morphology diversity.To-gether with the flourishing development of composition-tuning strategy,the rational dimension design and elaborate control over the architectures have also evolved into an effective approach to regulating their EM properties.Herein,we provide a comprehensive review of the recent advances in using di-mension and morphology modulation to adjust the microwave attenuation capacities for MOF-derived carbon composites.The underlying design rules and unique advantages for the MAMs of various dimen-sions were discussed with the selection of representative work,providing general concepts and insight on how to efficiently tune the morphologies.Accordingly,the fundamental dimension-morphology-function relationship was also elucidated.Finally,the challenges and perspectives of dimension design and mor-phology control over MOF-derived MAMs were also presented.
基金supported by funds from the National Natural Science Foundation of China (Grant Nos. 41930319, 41890844, 41890845 and 41720104002)the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB26000000)+3 种基金111 Project (Grant No. D17013)Key Scientific and Technological Innovation Team Project in Shaanxi Provincefunded by the China Postdoctoral Science Foundation (Grant No. 2022M712570)support from a Herchel Smith Postdoctoral Fellowship (University of Cambridge)。
文摘Over one hundred arthropod fossil species have been described from the famous Chengjiang Lagerst?tte(South China, Cambrian Stage 3, ca. 518 Ma) including a diverse assemblage of radiodonts–a group containing Anomalocaris and its relatives. These iconic stem-group euarthropods include some of the largest animals of the time, and some are known from hundreds of specimens. A longstanding conundrum has been the rarity or absence of hurdiids from Cambrian Series 2 Lagerst?tten like Chengjiang. This is because radiodonts are generally common in such deposits and the oldest radiodont ever discovered is a hurdiid. Furthermore, this family displays the widest geographic and temporal ranges of all radiodont families, and the highest diversity. Here we document the first hurdiid frontal appendages from Chengjiang, which display unique features within the family and may provide insights for understanding the character evolution of hurdiid appendages. The palaeoenvironmental distribution of hurdiids suggests that the rarity of hurdiids in Chengjiang may be due to a preference for deeper water environments,and the later success of this family from the Wuliuan onwards may relate to their ability to tolerate cooler water temperatures than other radiodont families. The palaeogeographical, palaeoenvironmental, and stratigraphical patterns observed in hurdiids maybe caused in part by the limited distributions of Konservat-Lagerst?tten in the Cambrian as well.
文摘The escalating demand for micro/nano-sized devices,such as micro/nano-robots,intelligent portable/wearable microsystems,and implantable medical microdevices,necessitates the expeditious development of integrated microsystems incorporating energy conversion,storage,and consumption.Critical bottlenecks in microscale energy storage/sensors and their integrated systems are being addressed by exploring new technologies and new materials,e.g.,MXene,holding great potential for developing lightweight and deformable integrated microdevices.This review summarizes the latest progress and milestones in the realization of MXene-based micro-supercapacitors(MSCs)and sensor arrays,and thus discusses the design fundamentals and key advancements of MXene-based energy conversion-storageconsumption integrated microsystems.Finally,we outline the key challenges in fabricating MXenebased MSCs/sensors and their self-powered integrated microsystems,which is crucial for their practical applications.Particularly,we illuminate viable solutions to such unsolved issues and highlight the exciting opportunities.
基金supported from the National Key Research and Development Program of China(Grant No.2021YFB3500504)the Innovation Program of Shanghai Municipal Education Commission(2017-01-07-00-03-E00025)+2 种基金the National Natural Science Foundation of China(Nos.52073058,52103359)Shanghai Sailing Program(Nos.20YF1400400,21YF1400600)the Fundamental Research Funds for the Central Universities(2232020G-07).
文摘All-inorganic CsPbX_(3)(X=Cl,Br,I)perovskite nanocrystals(NCs)are emerging as promising candidate materials for optoelectronic devices due to their splendid optical and electrical properties.However,the intrinsic instability greatly limits their practical application.Herein,a feasible strategy is proposed for fabricating highly stable and luminescent CsPbBr_(3)@PVDF-HFP/PS nanofibers by combining one-step electrospinning method with 1H,1H,2H,2H-perfluorodecyltrimethoxysi-lane(PFDTMS)-assisted post-treatment.The bright-emitting CsPbBr_(3) NCs can be effectively encapsulated within polymer nanofibers,which exhibit ultrafine diameter of only 88.1±2.8 nm and high photoluminescence quantum yield(PLQY)of 87.9%via rationally optimizing the electrospinning parameters,concentration of perovskite precursors and ligands.Most importantly,the superhydrophobic surface structures of nanofibers are formed by the hydrolysis and condensation of PFDTMS under moist environment.Benefiting from the double effective protection of polymer matrices and hydrophobic PFDTMS oligomers against moisture erosion,the CsPbBr_(3)@PVDF-HFP/PS nanofibers present an obviously improved stability,which can retain 90%initial PL intensity after water immersion for 70 days.Furthermore,an efficient white light-emitting diode with wide color gamut covering 117%of National Television System Committee(NTSC)standard is successfully fabricated based on the composite nanofiber membranes,suggesting their promising prospect for solid-state lighting and display applications.
基金support from National Natural Science Foundation of China(No.51702046 and No.91963204)the program for Professor of Special Appointment(Eastern Scholar),State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University.
文摘The X band(8 GHz-12 GHz)is the electromagnetic wave band emitted by most electronic instruments in our life,which will cause electromagnetic pollution harm to human health.Due to the coexistence of magnetic loss and dielectric loss,the modified Fe_(3)O_(4)-carbon-based nanomaterial exhibit strong electromagnetic(EM)wave absorptive capacity.However,there is a problem that the effective absorption bandwidth(EAB,the frequency bandwidth of reflection loss is less than-10 dB)of the X band is narrow.Increasing the EAB value of Fe_(3)O_(4)-carbon-based materials is of great significance for reducing electromagnetic pollution.Here,an emulsion-based self-assembly technique and ligand carbonization treatment have been used to construct the Fe_(3)O_(4)@C supraparticles for the evaluation of EM performance.The Fe_(3)O_(4)@C supraparticles exhibit excellent EM absorption properties,which can achieve full coverage of X band from 6.52 GHz to 12.9 GHz at a sample thickness of 3 mm.Besides,the optimum EAB value of Fe_(3)O_(4)@C supraparticles is up to 8.55 GHz from 9 to 18 GHz at a sample thickness of 2.5 mm.The Fe_(3)O_(4)@C supraparticles with superlattice structure will have potential development prospects in the application of broadband absorption.
基金This study was partially supported by the grant from the National Natural Science Foundation of China(no.81500474)Natural Science Foundation of Liaoning Province(no.2015020409).
文摘目的:回顾性比较伴与不伴急性上消化道出血(AUGIB)或急性食管静脉曲张出血(AEVB)的肝硬化患者止血/凝血指标的差异,包括血小板计数(PLT)、凝血酶原时间(PT)、国际标准化比率(INR)和活化部分凝血活酶时间(APTT)。方法:2012年1月至2014年6月间,共计1734例肝硬化患者纳入研究。根据其病史分为AUGIB组(497例)和无AUGIB组(1237例);同时根据内镜检查结果分为AEVB组(297例)和无AEVB组(1259例),另178例AUGIB患者由于缺乏内镜资料,既未入AEVB组,也未归入无AEVB组。结果:AUGIB组与无AUGIB组患者相比,PLT(99.99±89.90 vs 101.47±83.03,P=0.734)和APTT(42.96±15.20 vs 43.77±11.01,P=0.219)的差异无统计学意义,但PT显著延长(17.30±5.62 vs 16.03±4.68,P<0.001),INR显著增高(1.45±0.69 vs 1.31±0.59,P<0.001)。PT可以独立预测AUGIB的发生,PT越低,AUGIB出现的可能性越小(OR=0.968,95%CI:0.942-0.994)。AEVB组与无AEVB组患者相比,PLT显著减少(86.87±62.14 vs 101.74±83.62,P=0.004),APTT显著缩短(40.98±7.98 vs 43.72±10.97,P<0.001),但PT(16.53±3.71 vs 16.0464.68,P=0.088)和INR(1.35±0.41 vs 1.3160.59,P=0.225)的差异则无统计学意义。PLT可独立预测AEVB的发生,PLT越高,AEVB出现的可能性越大(OR=1.004,95%CI:1.002-1.006)。结论:PLT与肝硬化患者门脉高压出血密切相关。
基金This work was financially supported by the National Natural Science Foundation of China(Nos.22125903,51872283,22005297,and 22109160)the“Transformational Technologies for Clean Energy and Demonstration”Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA21000000)+4 种基金Dalian Innovation Support Plan for High Level Talents(No.2019RT09)Dalian National Laboratory For Clean Energy(DNL),Chinese Academy of Sciences(CAS),DNL Cooperation Fund,CAS(Nos.DNL201912,DNL201915,DNL202016,and DNL202019)Dalian Institute of Chemical Physics(Nos.DICP ZZBS201802 and DICP I2020032)the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(Nos.YLU-DNL Fund 2021002 and YLU-DNL Fund 2021009)China Postdoctoral Science Foundation(Nos.2021M693127,2020M680995,and 2021M693126).
文摘Ultracompact and customizable micro-supercapacitors(MSCs)are highly demanded for powering microscale electronics of 5G and Internet of Things technologies.So far,tremendous efforts have been concentrated on fabricating high-performance MSCs;however,compatible fabrication and monolithic integration of MSCs with microelectronic systems still remains a huge challenge taking into full consideration the factors such as electrode film fabrication,high-resolution microelectrode pattern,and electrolyte precise deposition.In this review,we summarize the recent advances of ultrasmall and integrated MSCs with tunable performance and customizable function,including key microfabrication technologies for patterning microelectrodes with superior resolution,precise deposition of customized electrolytes in an extremely small space,and feasible strategies for improving electrochemical performance by constructing thick microelectrodes and special electrode structure.Finally,the related challenges and key prospects of ultracompact and customizable MSCs,including compatible microfabrication methods for electrode materials and films,patterning microelectrodes,customizing shape-conformable electrolytes,performance optimization,and efficient integration with microelectronic systems,are put forward for further promoting their practical application.
