Gene resources associated with plant stature and flowering time are invaluable for maize breeding.In this study,using an F2:3population derived from a natural semi-dwarf mutant grmm and a normal inbred line Si 273,we ...Gene resources associated with plant stature and flowering time are invaluable for maize breeding.In this study,using an F2:3population derived from a natural semi-dwarf mutant grmm and a normal inbred line Si 273,we identified a major pleiotropic QTL on the distal long arm of chromosome 1(qPH1_dla),and found that qPH1_dla controlled plant height,flowering time,ear and yield traits.qPH1_dla was finemapped to a 16 kb interval containing ZmAMP1,which was annotated as a glutamate carboxypeptidase.Allelism tests using two independent allelic mutants confirmed that ZmAMP1 was the causal gene.Realtime quantitative PCR and genomic sequence analysis suggested that a nonsynonymous mutation at the598th base of ZmAMP1 gene was the causal sequence variant for the dwarfism of grmm.This novel ZmAMP1 allele was named ZmAMP1_grmm.RNA sequencing using two pairs of near isogenic lines(NILs)showed that 84 up-regulated and 68 down-regulated genes in dwarf NILs were enriched in 15metabolic pathways.Finally,introgression of ZmAMP1_grmm into Zhengdan 958 and Xianyu 335 generated two improved F1lines.In field tests,they were semi-dwarf,early-flowering,lodging-resistant,and high-yielding under high-density planting conditions,suggesting that ZmAMP1_grmm is a promising Green Revolution gene for maize hybrid breeding.展开更多
In recent years,the precisely controlled synthesis of chiral twisted molecular carbons has emerged as a forefront topic in the research of carbon materials.Molecular carbons refer to carbon nanomaterials synthesized w...In recent years,the precisely controlled synthesis of chiral twisted molecular carbons has emerged as a forefront topic in the research of carbon materials.Molecular carbons refer to carbon nanomaterials synthesized with precision at the atomic level.Through rational design,rigid and stable chiral twisted structures can be synthesized.The exploration in the field of chiral twisted molecular carbons is key to fully understanding the various twisted configurations of carbon materials and delving into the relationship between structure design and functionality.This review explores chiral twisted configurations of carbon nanomater-ials such as nanographene,carbon nanobelts,carbon nanosheets,graphdiyne,etc.It emphasizes the role of photocyclization,Scholl reaction,and Diels–Alder reactions in achieving precise chiral control and discusses a range of innovative design strategies.These strategies have led to the development of various twisted structures,such as helical,propeller,and Möbius strip configurations.The introduction of chirality,combined with the inherent exceptional optical properties of nanocarbon materials,has facilitated the creation of materials with superior chiroptical performances.This advancement is driving applications in fields such as optoelectronics and chiral optics.展开更多
A stable and recyclable of BiOBr/silk fibroincellulose acetate composite film was prepared by blendingwet phase transformation and in situ precipitate technology.The cellulose acetate film modified by silk fibroin for...A stable and recyclable of BiOBr/silk fibroincellulose acetate composite film was prepared by blendingwet phase transformation and in situ precipitate technology.The cellulose acetate film modified by silk fibroin formed a finger-shaped porous structure,which provided a large space for the uniform growth of BiOBr nanosheets and facilitated the shuttle flow of dyes in film.The morphology,phase structure,and optical properties of the composite films were characterized using various techniques,and their photocatalytic performance for dye wastewater was evaluated under visible light irradiation.Results showed that the BiOBr/SF-CA composite film exhibited efficient photocatalytic activity with 99.9%of rhodamine B degradation rate.Moreover,the composite film maintained high catalytic stability because Bi as the active species deposited on the film showed almost no loss.Finally,the possible photocatalytic mechanisms in the BiOBr/SF-CA composite film were speculated through radical-trapping experiments and electron spin resonance testing.展开更多
Choosing the appropriate antibiotics to treat bacterial infections has grown more challenging as a result of the emergence of antibiotic-resistant bacteria.Aminoglycosides,as broad-spectrum antibiotics,are increasingl...Choosing the appropriate antibiotics to treat bacterial infections has grown more challenging as a result of the emergence of antibiotic-resistant bacteria.Aminoglycosides,as broad-spectrum antibiotics,are increasingly being used clinically;however,for most effective employment of aminoglycosides,a comprehensive understanding of aminoglycoside resistance genes’prevalence and dissemination is required.Therefore,to better understand the global resistance status of aminoglycoside antibiotics and the prevalence of antibiotic-resistance genes(ARGs)in various bacterial species,this systematic review gathered relevant data from multiple studies.Two primary resistance mechanisms-aminoglycoside enzymatic modification and 16S rRNA methylation-were assessed,and the prevalence of the corresponding ARGs was described.The coexistence of aminoglycoside ARGs with other ARGs was also demonstrated,as was the relationship between aminoglycoside ARGs and resistant phenotypes.The lack of effective therapeutic agents to combat resistant pathogens presents a real threat to public health.The combination of aminoglycosides with other antibiotics may provide a novel treatment strategy.展开更多
A synergistically directed assembly approach to distinctive metal-organic frameworks utilizing both donor-acceptor (D-A) interaction from aromatic systems and coordination interactions is presented.Based on such an ap...A synergistically directed assembly approach to distinctive metal-organic frameworks utilizing both donor-acceptor (D-A) interaction from aromatic systems and coordination interactions is presented.Based on such an approach,the coronene-tpt (tpt =2,4,6-tri(4-pyridyl)-1,3,5-triazine) stacks based coronene-MOF-1-4 have been successfully fabricated.Their structural discrepancies with coroneneabsent control products,1'-4',illustrate clearly the significance of coronene-tpt based D-A interactions in these architectures.All these coronene-MOFs contain varied coronene-tpt stacks as organic secondary building blocks (SBUs),which are closely interrelated with the coordination based framework structures.Moreover,porous coronene-MOF-1 and-2 exhibit high physicochemical stability and significant light hydrocarbons storage and separation performances.展开更多
Metal-organic frameworks(MOFs),comprised of metal ions/clusters and organic ligands,have shown promising potential for numerous applications.Recently,luminescent MOFs(LMOFs),with the superiorities of inherent crystall...Metal-organic frameworks(MOFs),comprised of metal ions/clusters and organic ligands,have shown promising potential for numerous applications.Recently,luminescent MOFs(LMOFs),with the superiorities of inherent crystallinity,definite structure,tunable pore,and multiple functionalizations,have bloomed out as sensors for the detection.Numerous LMOFs have been synthesized and used for sensing applications.Herein,the recent advances of LMOFs as chemical sensors for the detection of diverse targets,including metal ions,anions,small molecules,volatile organic compounds,nitro-aromatic explosives,gases,and biomolecules,have been summarized.Additionally,the detection mechanisms and the relationship between structure and properties of the materials are also illustrated.This review could be useful reference for the rational construction and sensing applications of LMOFs.展开更多
Electrochemical energy storage devices,such as lithium ion batteries(LIBs),supercapacitors and fuel cells,have been vigorously developed and widely researched in past decades.However,their safety issues have appealed ...Electrochemical energy storage devices,such as lithium ion batteries(LIBs),supercapacitors and fuel cells,have been vigorously developed and widely researched in past decades.However,their safety issues have appealed immense attention.Gel electrolytes(GEs),with a special state in-between liquid and solid electrolytes,are considered as the most promising candidates in electrochemical energy storage because of their high safety and stability.This review summarized the recent progresses made in the application of GEs in the safety regulation of the electrochemical energy storage devices.Special attention was paid to the gel polymer electrolytes,the organic low molecule-mass GEs,as well as the fumed silica-based and siloxane-based GEs.Finally,the current challenges and future directions were proposed in terms of the development of GEs.展开更多
Thermosensitive polymers show an entropy-driven transition from a well-solvated to a poorly solvated polymer chain, resulting in a more compact globular conformation. The transition at the lower critical solution temp...Thermosensitive polymers show an entropy-driven transition from a well-solvated to a poorly solvated polymer chain, resulting in a more compact globular conformation. The transition at the lower critical solution temperature（LCST） is often sharp, which allows for a wide range of smart material applications.At the LCST, oligo（ethylene glycol）-substituted polyisocyanides（PICs） form soft hydrogels, composed of polymer bundles similar to biological gels, such as actin, fibrin and intermediate filaments. Here, we show that the LCST of PICs strongly depends linearly on the length of the ethylene glycol（EG） tails; every EG group increases the LCSTand thus the gelation temperature by nearly 30 ℃. Using a copolymerisation approach, we demonstrate that we can precisely tailor the gelation temperature between 10 ℃ and 60 ℃and, consequently, tune the mechanical properties of the PIC gels.展开更多
Highly efficient nonlinear optical（NLO） materials with well-defined architectures in the wavelength and subwavelength length scales are of particular importance for next generation of integrated photonic circuits. F...Highly efficient nonlinear optical（NLO） materials with well-defined architectures in the wavelength and subwavelength length scales are of particular importance for next generation of integrated photonic circuits. Fluorenone analogues have been demonstrated to be promising candidates as building blocks for assembly of organic NLO materials thanks to their synergistic supramolecular interactions and brilliant optical properties. Here we have studied the polymorphs of a phenylethynyl functionalized fluorenone derivative, and their controlled self-assembly for microstructures with different morphologies. These polymorphic microcrystals exhibit very distinctive NLO properties, highly related to their supramolecular and electronic structures.展开更多
Aggregation-induced emission(AIE)is a vital photophysical phenomenon that the luminogens in the concentrated or aggregated cases will engender the dramatically boosted emission in comparison with the dispersive states...Aggregation-induced emission(AIE)is a vital photophysical phenomenon that the luminogens in the concentrated or aggregated cases will engender the dramatically boosted emission in comparison with the dispersive states.Given this extraordinary emitting capacity exactly resolves the aggregation-caused quenching(ACQ)situations residing in the traditional luminophores,the booming AIE luminogens have drawn tremendous interest owing to their advanced performances and colossal potential applications in various areas.Further exploitations of AIE molecules also drive the research interests in the midst of these AIE materials toward the nonlinear optical(NLO)regime.The combination of AIE and NLO effects have nurtured some unforeseen properties of AIE materials and extended their application spheres.Therefore,some NLO-active AIE materials have been wielded in many crucial applications,for example,optical limiting,laser,bioimaging,and photodynamic therapy.Meanwhile,the impacts of aggregate on the NLO effect also deserve deep considerations and pursuits,and the modifications of aggregates promise an easy,efficient,and prompt avenue to tune the NLO properties of materials.The recent achievements and progress in the NLO properties of AIE materials have been summarized in this review.The second-order and third-order NLOs of the AIE materials have been introduced and their correlative applications have been discussed.展开更多
It is our great honor to dedicate this special issue of Science China Materials to Nankai University(NKU)in celebration of its 100th anniversary.Established by two famous patriotic educators Xiu Yan and Boling Zhang i...It is our great honor to dedicate this special issue of Science China Materials to Nankai University(NKU)in celebration of its 100th anniversary.Established by two famous patriotic educators Xiu Yan and Boling Zhang in1919,NKU is one of China’s top universities with a long tradition in education.It has been playing essential roles as a pioneer in the course of China’s modernization with the aim of“Knowing China and Serving China”.Chemistry at NKU has a rich history.展开更多
Flat and crystalline materials with exceptional nonlinear optical(NLO) properties are highly desirable for their potential applications in integrated NLO photonic devices.Graphdiyne(GD),a new twodimensional(2 D) carbo...Flat and crystalline materials with exceptional nonlinear optical(NLO) properties are highly desirable for their potential applications in integrated NLO photonic devices.Graphdiyne(GD),a new twodimensional(2 D) carbon allotrope,has recently evoked burgeoning research attention by virtue of its tunable bandgap along with a high carrier mobility and extended π-conjugation compared with most conventional optical materials.Here,we experimentally probe the third-order nonlinear optical response of GD dispersed in several common solvents(alcohols) using a femtosecond Z-scan technique.The measured nonlinear optical refractive index is in the order of ~10^(-8) cm^(2)/W,which is approximately one order of magnitude higher than that of most 2 D materials.In particular,we find that different NLO responses can be observed from GD when dispersed in different solvents,with the strongest NLO response when dispersed in 1-propanol.It is proposed that some intrinsic properties of the solvents,such as the polarity and viscosity,could influence the NLO response of GD materials.Our experimental results confirm the assumptions on the NLO behavior in GD and demonstrate its great potential for future generations of Kerr-effect-based NLO materials and devices.展开更多
Molecular materials, together with metals, ceramics, and polymer materials, are among the most important materials. The research efforts on molecular materials are targeting three main aspects, namely the assembly tec...Molecular materials, together with metals, ceramics, and polymer materials, are among the most important materials. The research efforts on molecular materials are targeting three main aspects, namely the assembly technique, multi-functionality, and their diverse application. In this regard, the main attention from the community is focused on the identification and construction of novel molecular materials with high performance for applications in the fields such as the optoelectronic devices and biological or medicine-related materials. This is a truly multi- disciplinary research field driven by the joint efforts of researchers from all different backgrounds including （but not limited to） Organic and Inorganic Chemistry, Supramolecular Chemistry, Semiconductor Molecules and Devices, Materials Science, as well as the Biological Chemistry. This special issue, themed on ＂Functional Molecular Materials＂, consists of 5 review articles and 19 original research papers, and covers a broad spectrum of important aspects in the research of functional molecular materials, ranging from the approaches for self-assembly and characterization of functional molecular systems, to their diverse applications in biological systems and optoelectronic materials and devices.展开更多
基金supported by the Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City(320LH043)the Key Scientific and Technological Research Project in Henan Province(222102110091)+2 种基金the China Agriculture Research System(CARS-02-13)the Hainan Yazhou Bay Seed Laboratory(B21HJ0223)the Chinese Academy of Agricultural Sciences(CAAS)Innovation Project(CAAS-ZDRW202004)。
文摘Gene resources associated with plant stature and flowering time are invaluable for maize breeding.In this study,using an F2:3population derived from a natural semi-dwarf mutant grmm and a normal inbred line Si 273,we identified a major pleiotropic QTL on the distal long arm of chromosome 1(qPH1_dla),and found that qPH1_dla controlled plant height,flowering time,ear and yield traits.qPH1_dla was finemapped to a 16 kb interval containing ZmAMP1,which was annotated as a glutamate carboxypeptidase.Allelism tests using two independent allelic mutants confirmed that ZmAMP1 was the causal gene.Realtime quantitative PCR and genomic sequence analysis suggested that a nonsynonymous mutation at the598th base of ZmAMP1 gene was the causal sequence variant for the dwarfism of grmm.This novel ZmAMP1 allele was named ZmAMP1_grmm.RNA sequencing using two pairs of near isogenic lines(NILs)showed that 84 up-regulated and 68 down-regulated genes in dwarf NILs were enriched in 15metabolic pathways.Finally,introgression of ZmAMP1_grmm into Zhengdan 958 and Xianyu 335 generated two improved F1lines.In field tests,they were semi-dwarf,early-flowering,lodging-resistant,and high-yielding under high-density planting conditions,suggesting that ZmAMP1_grmm is a promising Green Revolution gene for maize hybrid breeding.
基金Fundamental Research Funds for the Central UniversitiesNatural Science Foundation of Tianjin Municipality,Grant/Award Number:23JCJQJC00110+1 种基金National Natural Science Foundation of China,Grant/Award Number:52172045National Key Research and Development Program of China,Grant/Award Numbers:2022YFA1204500,2022YFA1204504。
文摘In recent years,the precisely controlled synthesis of chiral twisted molecular carbons has emerged as a forefront topic in the research of carbon materials.Molecular carbons refer to carbon nanomaterials synthesized with precision at the atomic level.Through rational design,rigid and stable chiral twisted structures can be synthesized.The exploration in the field of chiral twisted molecular carbons is key to fully understanding the various twisted configurations of carbon materials and delving into the relationship between structure design and functionality.This review explores chiral twisted configurations of carbon nanomater-ials such as nanographene,carbon nanobelts,carbon nanosheets,graphdiyne,etc.It emphasizes the role of photocyclization,Scholl reaction,and Diels–Alder reactions in achieving precise chiral control and discusses a range of innovative design strategies.These strategies have led to the development of various twisted structures,such as helical,propeller,and Möbius strip configurations.The introduction of chirality,combined with the inherent exceptional optical properties of nanocarbon materials,has facilitated the creation of materials with superior chiroptical performances.This advancement is driving applications in fields such as optoelectronics and chiral optics.
基金the financial support by the National Natural Science Foundation of China(Grant No.22202068)Natural Science Foundation in Hunan Province(Grant No.2021JJ30239)Natural Science Foundation for Distinguished Young Scholars in Hunan Province(Grant No.2020JJ2014).
文摘A stable and recyclable of BiOBr/silk fibroincellulose acetate composite film was prepared by blendingwet phase transformation and in situ precipitate technology.The cellulose acetate film modified by silk fibroin formed a finger-shaped porous structure,which provided a large space for the uniform growth of BiOBr nanosheets and facilitated the shuttle flow of dyes in film.The morphology,phase structure,and optical properties of the composite films were characterized using various techniques,and their photocatalytic performance for dye wastewater was evaluated under visible light irradiation.Results showed that the BiOBr/SF-CA composite film exhibited efficient photocatalytic activity with 99.9%of rhodamine B degradation rate.Moreover,the composite film maintained high catalytic stability because Bi as the active species deposited on the film showed almost no loss.Finally,the possible photocatalytic mechanisms in the BiOBr/SF-CA composite film were speculated through radical-trapping experiments and electron spin resonance testing.
基金the National Key Research and Development Program of China(2020YFE0205700,2022YFC2303900)the major projects of the National Natural Science Foundation of China(22193064)+2 种基金the Research Foundation for Youth Scholars of Beijing Technology and Business University(19008022271)the National Science and Technology Major Project(2018ZX10714002)the Science Foundation(2022SKLID303)of the State Key Laboratory of Infectious Disease Prevention and Control,China.
文摘Choosing the appropriate antibiotics to treat bacterial infections has grown more challenging as a result of the emergence of antibiotic-resistant bacteria.Aminoglycosides,as broad-spectrum antibiotics,are increasingly being used clinically;however,for most effective employment of aminoglycosides,a comprehensive understanding of aminoglycoside resistance genes’prevalence and dissemination is required.Therefore,to better understand the global resistance status of aminoglycoside antibiotics and the prevalence of antibiotic-resistance genes(ARGs)in various bacterial species,this systematic review gathered relevant data from multiple studies.Two primary resistance mechanisms-aminoglycoside enzymatic modification and 16S rRNA methylation-were assessed,and the prevalence of the corresponding ARGs was described.The coexistence of aminoglycoside ARGs with other ARGs was also demonstrated,as was the relationship between aminoglycoside ARGs and resistant phenotypes.The lack of effective therapeutic agents to combat resistant pathogens presents a real threat to public health.The combination of aminoglycosides with other antibiotics may provide a novel treatment strategy.
基金This work was supported by the National Natural Science Foundation of China (Nos. 21421001, 21531005, 91856124, and 21875115)the Programme of Introducing Talents of Discipline to Universities (B18030)the General Financial Grant from the China Postdoctoral Science Foundation (No. 2017M621056).
文摘A synergistically directed assembly approach to distinctive metal-organic frameworks utilizing both donor-acceptor (D-A) interaction from aromatic systems and coordination interactions is presented.Based on such an approach,the coronene-tpt (tpt =2,4,6-tri(4-pyridyl)-1,3,5-triazine) stacks based coronene-MOF-1-4 have been successfully fabricated.Their structural discrepancies with coroneneabsent control products,1'-4',illustrate clearly the significance of coronene-tpt based D-A interactions in these architectures.All these coronene-MOFs contain varied coronene-tpt stacks as organic secondary building blocks (SBUs),which are closely interrelated with the coordination based framework structures.Moreover,porous coronene-MOF-1 and-2 exhibit high physicochemical stability and significant light hydrocarbons storage and separation performances.
基金financially supported by the National Natural Science Foundation of China (21531005, 21421001, 21905142, and 91856124)the Programme of Introducing Talents of Discipline to Universities (B18030)
文摘Metal-organic frameworks(MOFs),comprised of metal ions/clusters and organic ligands,have shown promising potential for numerous applications.Recently,luminescent MOFs(LMOFs),with the superiorities of inherent crystallinity,definite structure,tunable pore,and multiple functionalizations,have bloomed out as sensors for the detection.Numerous LMOFs have been synthesized and used for sensing applications.Herein,the recent advances of LMOFs as chemical sensors for the detection of diverse targets,including metal ions,anions,small molecules,volatile organic compounds,nitro-aromatic explosives,gases,and biomolecules,have been summarized.Additionally,the detection mechanisms and the relationship between structure and properties of the materials are also illustrated.This review could be useful reference for the rational construction and sensing applications of LMOFs.
基金financially supported by the National Natural Science Foundation of China (21773168)Tianjin Natural Science Foundation (16JCQNJC05000)
文摘Electrochemical energy storage devices,such as lithium ion batteries(LIBs),supercapacitors and fuel cells,have been vigorously developed and widely researched in past decades.However,their safety issues have appealed immense attention.Gel electrolytes(GEs),with a special state in-between liquid and solid electrolytes,are considered as the most promising candidates in electrochemical energy storage because of their high safety and stability.This review summarized the recent progresses made in the application of GEs in the safety regulation of the electrochemical energy storage devices.Special attention was paid to the gel polymer electrolytes,the organic low molecule-mass GEs,as well as the fumed silica-based and siloxane-based GEs.Finally,the current challenges and future directions were proposed in terms of the development of GEs.
基金the Netherlands Organisation for Scientific Research (NWO)for providing and supporting beam time at the DutchBelgium beamline(DUBBLE) for SAXS experiments(No. BM26-02773)financial support from NWO (VENI grant No. 680-47-437)+2 种基金the Euopean Union's 2020 ResearchInnovation Programme under Grant Agreement No. 642687project Biogel
文摘Thermosensitive polymers show an entropy-driven transition from a well-solvated to a poorly solvated polymer chain, resulting in a more compact globular conformation. The transition at the lower critical solution temperature（LCST） is often sharp, which allows for a wide range of smart material applications.At the LCST, oligo（ethylene glycol）-substituted polyisocyanides（PICs） form soft hydrogels, composed of polymer bundles similar to biological gels, such as actin, fibrin and intermediate filaments. Here, we show that the LCST of PICs strongly depends linearly on the length of the ethylene glycol（EG） tails; every EG group increases the LCSTand thus the gelation temperature by nearly 30 ℃. Using a copolymerisation approach, we demonstrate that we can precisely tailor the gelation temperature between 10 ℃ and 60 ℃and, consequently, tune the mechanical properties of the PIC gels.
基金the financial supports from the National Natural Science Foundation of China(NSFC) (Nos.21773168, 51503143 and 21761132007)the Tianjin Natural Science Foundation(No. 16JCQNJC05000)+5 种基金the Innovation Foundation of Tianjin University (No. 2016XRX-0017)the China International Science and Technology Projects(No. S2016G3413)The Netherlands Organization for Scientific Research (NWO) with the Veni Grant (No. 680-47-437)The Royal Netherlands Academy of Arts and Sciences(KNAW) with the China-Exchange Program (No. 530-4CDPO2)the Tianjin 1000 Youth Talents Planthe Chinese Scholarship Council (CSC)
文摘Highly efficient nonlinear optical（NLO） materials with well-defined architectures in the wavelength and subwavelength length scales are of particular importance for next generation of integrated photonic circuits. Fluorenone analogues have been demonstrated to be promising candidates as building blocks for assembly of organic NLO materials thanks to their synergistic supramolecular interactions and brilliant optical properties. Here we have studied the polymorphs of a phenylethynyl functionalized fluorenone derivative, and their controlled self-assembly for microstructures with different morphologies. These polymorphic microcrystals exhibit very distinctive NLO properties, highly related to their supramolecular and electronic structures.
基金National Natural Science Foundation of China,Grant/Award Numbers:21773168,21531005,91622111。
文摘Aggregation-induced emission(AIE)is a vital photophysical phenomenon that the luminogens in the concentrated or aggregated cases will engender the dramatically boosted emission in comparison with the dispersive states.Given this extraordinary emitting capacity exactly resolves the aggregation-caused quenching(ACQ)situations residing in the traditional luminophores,the booming AIE luminogens have drawn tremendous interest owing to their advanced performances and colossal potential applications in various areas.Further exploitations of AIE molecules also drive the research interests in the midst of these AIE materials toward the nonlinear optical(NLO)regime.The combination of AIE and NLO effects have nurtured some unforeseen properties of AIE materials and extended their application spheres.Therefore,some NLO-active AIE materials have been wielded in many crucial applications,for example,optical limiting,laser,bioimaging,and photodynamic therapy.Meanwhile,the impacts of aggregate on the NLO effect also deserve deep considerations and pursuits,and the modifications of aggregates promise an easy,efficient,and prompt avenue to tune the NLO properties of materials.The recent achievements and progress in the NLO properties of AIE materials have been summarized in this review.The second-order and third-order NLOs of the AIE materials have been introduced and their correlative applications have been discussed.
文摘It is our great honor to dedicate this special issue of Science China Materials to Nankai University(NKU)in celebration of its 100th anniversary.Established by two famous patriotic educators Xiu Yan and Boling Zhang in1919,NKU is one of China’s top universities with a long tradition in education.It has been playing essential roles as a pioneer in the course of China’s modernization with the aim of“Knowing China and Serving China”.Chemistry at NKU has a rich history.
基金Financial support from the National Natural Science Foundation of China(Nos.21773168 and 21761132007)the Dutch Research Council(NWO)are gratefully acknowledgedthe supports from the China Scholarship Council(CSC)。
文摘Flat and crystalline materials with exceptional nonlinear optical(NLO) properties are highly desirable for their potential applications in integrated NLO photonic devices.Graphdiyne(GD),a new twodimensional(2 D) carbon allotrope,has recently evoked burgeoning research attention by virtue of its tunable bandgap along with a high carrier mobility and extended π-conjugation compared with most conventional optical materials.Here,we experimentally probe the third-order nonlinear optical response of GD dispersed in several common solvents(alcohols) using a femtosecond Z-scan technique.The measured nonlinear optical refractive index is in the order of ~10^(-8) cm^(2)/W,which is approximately one order of magnitude higher than that of most 2 D materials.In particular,we find that different NLO responses can be observed from GD when dispersed in different solvents,with the strongest NLO response when dispersed in 1-propanol.It is proposed that some intrinsic properties of the solvents,such as the polarity and viscosity,could influence the NLO response of GD materials.Our experimental results confirm the assumptions on the NLO behavior in GD and demonstrate its great potential for future generations of Kerr-effect-based NLO materials and devices.
文摘Molecular materials, together with metals, ceramics, and polymer materials, are among the most important materials. The research efforts on molecular materials are targeting three main aspects, namely the assembly technique, multi-functionality, and their diverse application. In this regard, the main attention from the community is focused on the identification and construction of novel molecular materials with high performance for applications in the fields such as the optoelectronic devices and biological or medicine-related materials. This is a truly multi- disciplinary research field driven by the joint efforts of researchers from all different backgrounds including （but not limited to） Organic and Inorganic Chemistry, Supramolecular Chemistry, Semiconductor Molecules and Devices, Materials Science, as well as the Biological Chemistry. This special issue, themed on ＂Functional Molecular Materials＂, consists of 5 review articles and 19 original research papers, and covers a broad spectrum of important aspects in the research of functional molecular materials, ranging from the approaches for self-assembly and characterization of functional molecular systems, to their diverse applications in biological systems and optoelectronic materials and devices.
