Cerium(Ce) compounds have attracted considerable attention as key components in functional coatings due to their many outstanding properties.This work provides a comprehensive review of recent advances in the applicat...Cerium(Ce) compounds have attracted considerable attention as key components in functional coatings due to their many outstanding properties.This work provides a comprehensive review of recent advances in the application of Ce in functional coatings.The role of Ce in the improvement of functional properties such as corrosion-resistance,self-healing,superhydrophobicity,wear-resistance,and UV shielding is reviewed from the perspective of functional mechanism and applied research.Furthermore,the strategies,processes,practical problems,and current challenges in the research of functional coatings containing Ce are summarized and discussed.The objective is to highlight the great potential of Ce in functional coatings,and to explore new applications of Ce in the development of novel coatings.Thus,this work aims to enhance the application value of Ce,solving the problem of unbalanced application of rare-earth elements.展开更多
The overuse of surfactants has made them well-known environmental pollutants.So far,it is still a challenge to simultaneously distinguish cationic,anionic,zwitterionic,nonionic surfactants and surfactants with similar...The overuse of surfactants has made them well-known environmental pollutants.So far,it is still a challenge to simultaneously distinguish cationic,anionic,zwitterionic,nonionic surfactants and surfactants with similar structures based on traditional analytical techniques.We developed a high-throughput method for distinguishing various surfactants based on the adaptive emission profile as fingerprints(AEPF).The fluorescence response of the sensor was based on the interaction between surfactants and 1,3-diacetylpyrene(o-DAP)probe.The interaction affected the reversible conversion of free molecules and two aggregates in the solution,thereby changing the relative abundance and the fluorescence intensity ratio of two aggregates emitting different fluorescence.The o-DAP sensor can distinguish four types of surfactants(16 surfactants),especially surfactants of the same type with similar structures.The o-DAP sensor sensitively determined the critical micelle concentration(CMC)of 16 surfactants based on the interaction between o-DAP and surfactants.Additionally,the o-DAP sensor can detect and distinguish artificial vesicles made from different surfactants.展开更多
The unique structure of fluorescent proteins in which the fluorophore is encapsulated by the protein shell to restrict rotation and emit light inspired the screening of chromophores that selectively bind to biomolecul...The unique structure of fluorescent proteins in which the fluorophore is encapsulated by the protein shell to restrict rotation and emit light inspired the screening of chromophores that selectively bind to biomolecules to generate fluorescence. In this paper, we report a curcuminoid-BF2-like fluorescent dye NBF2containing 4-dimethylaniline as an electron-donating group. When this dye is combined with HSA or BSA, the fluorescence is enhanced 90/112-fold, and the fluorescence quantum yield increases from <0.001to 0.16/0.19. Such a large change in fluorescence enhancement is due to the encapsulation of N-BF2in the protein cavity by HSA/BSA, which inhibits the intramolecular rotation of the aniline moiety caused by charge transfer after the fluorophore is excited by light. N-BF2has fast and strong binding to HSA or BSA and was found to be reversible in solution and intracellularly. Since N-BF2also has the ability to target lipid droplets, the complex of N-BF2/HSA realizes the regulation of reversible lipid droplet staining in cells.展开更多
Membrane permeability and intracellular diffusion of fluorescent probes determine staining selectivity of intracellular substructures.However,the relationship between the molecular structure of fluorescent probes and ...Membrane permeability and intracellular diffusion of fluorescent probes determine staining selectivity of intracellular substructures.However,the relationship between the molecular structure of fluorescent probes and their membrane permeability and intracellular distribution is poorly understood.In this paper,we reported a series of 1,8-naphthalimide dyes and carried out cell imaging experiments,and found that the presence of amino hydrogen in these dyes played a crucial role in their cell membrane permeability and intracellular distribution.The secondary amino group containing compounds 1-4 show excellent membrane permeability and strong fluorescence in living cells.While the tertiary amine containing dyes 5 and 6 can hardly permeate the cell membrane though they show extremely similar structure with compounds 2-4.Compound 1 can selectively image lipid droplets by selecting the wavelength of excitation light.With the specificity for lysosomes,2 and 4 have been used in long-term time-lapses imaging of lysosomal dynamics and tracking the process of lysosome-lysosome interaction,fusion and movement.The effect of hydrogen-containing amino substituent on the cell membrane permeability of fluorescent molecules is promising for the development of better biocompatible probes.展开更多
The demand for enhanced optical properties in advanced fluorescence technologies has driven research into the structure-property relationship of fluorophores.In this paper,we use naphthalene fluorophores Na DC-Aze and...The demand for enhanced optical properties in advanced fluorescence technologies has driven research into the structure-property relationship of fluorophores.In this paper,we use naphthalene fluorophores Na DC-Aze and PhDO-Aze as a case study to emphasize the pivotal role of cross conjugation in tuning the optical structure-property relationship.Na DC-Aze and PhDO-Aze,formed by hybridizing two distinct conjugated systems in a single naphthalene molecule,exhibit spectral characteristics from both conjugated systems.Experimental data and theoretical calculations demonstrate the coexistence of two electron-delocalization systems in a cross-conjugation manner in both Na DC-Aze and PhDO-Aze.The cross-conjugation fluorophores exhibit high brightness,large Stokes shift,and a broad absorption wavelength range by combining distinct spectral properties from its parent fluorophores.These spectral properties will be advantageous for certain applications(i.e.,panchromatic absorption in organic solar cells,and fluorophores compatible with a wide range of excitation wavelengths).展开更多
The aim of this study was to develop robust tracking control schemes for the 3D leap trajectory of hypersonic gliding vehicles using sliding mode theory. A predictor-corrector guidance method was applied to the genera...The aim of this study was to develop robust tracking control schemes for the 3D leap trajectory of hypersonic gliding vehicles using sliding mode theory. A predictor-corrector guidance method was applied to the generation of the reference trajectory, and drag acceleration was selected as the profile of reference tracking. A combined super-twisting sliding mode controller(CST-SMC) is proposed to decrease the tracking error and guarantee the tracking performance in the presence of system nonlinearities compared to three other common controllers: the linear sliding mode controller(L-SMC), global fast terminal sliding mode controller(GFT-SMC), and super-twisting sliding mode controller(ST-SMC). By using the developed controller, the system state of a second-order drag acceleration tracking error system can approach the global fast terminal sliding manifold in finite time. By using the Lyapunov approach, sufficient conditions are deduced to ensure that the tracking performance is obtained for a closed-loop system. Furthermore, we show that the controller is robust to initial uncertain parameters and other perturbations, as validated by simulation results with appropriate gains.展开更多
Plant volatile organic compounds (Biogenic Volatile Organic compounds, referred BVOCs) have a significant impact on the atmospheric environment, air quality and human health. This experiment takes Acer truncatum flowe...Plant volatile organic compounds (Biogenic Volatile Organic compounds, referred BVOCs) have a significant impact on the atmospheric environment, air quality and human health. This experiment takes Acer truncatum flowers as the research object, uses solid-phase micro-extraction combine GC-MS (SPME-GC-MS) to detect the main component of volatiles released by the flowers from 10 individual trees of Acer truncatum (Acer truncatum Bunge). The results showed that 37 kinds of volatiles were detected and they are belonged to four types organic compouds, such as terpenoids, alcohols, ketones, esters. According to the analysis of the main components of Acer truncatum flower volatiles includes Fluorene, 4,8 -Dimethyl-1,3 (E), 7-Nonene, (cis, trans)-2,6-Dimethyl-2,4,6-triene-Partenkirchen, Myrcene, Basil hexene, 3-Carene, (E)-Basil, Camphene, Caryophyllene, Linalool, α-Terpinolene, O-cymene, 3-Vinyl-1,2-dimethyl-1, Eucalyptus alcohols and Alcohol vinegar-12. However, there were no significant differences between individual trees in terms of obscure material O-cymene, Eucalyptus alcohols, Alcohol vinegar-12, as well as the significant differences in terms of remaining volatiles.展开更多
Acer truncatum is considered a promising species as a raw material to produce nervonic acid(NA). The goal of this study was to explore the variation of oil content and nervonic acid content of 138 accessions native to...Acer truncatum is considered a promising species as a raw material to produce nervonic acid(NA). The goal of this study was to explore the variation of oil content and nervonic acid content of 138 accessions native to 14 regions in China as well as provide guidance for establishing plantations and improving the production of nervonic acid. A large range of variation was found in oil content, nervonic acid per gram of oil, and nervonic acid per gram of seed(17.81%–36.56%, 3.90%–7.85%, and 0.84%–2.31%, respectively). Accessions YS-6, ABZ-6 and DQTL-8 were found as the most promising potential oil sources; PQ-2 was considered the optimal germplasm, and JY-6, NJ-8, LF-6, and CC-8 were found as promising potential sources for producing NA. A very significant difference(P < 0.01) among 14 regions was observed. DQTL and YS regions are considered the optimal farming regions for crops with high oil content, while the CC and PQ regions are regarded as the most suitable regions for nervonic acid production. A geographical trend from South to North was observed in which amount of seed oil increased but no such trend in nervonic acid content was observed. The data collected in the study on oil content and nervonic acid in accessions of A. truncatum in various regions can be utilized for establishing plantations of promising genotypes through clonal means.展开更多
The stability of supersonic inlets faces challenges due to various changes in flight conditions,and flow control methods that address shock wave/boundary layer interactions under only one set of conditions cannot meet...The stability of supersonic inlets faces challenges due to various changes in flight conditions,and flow control methods that address shock wave/boundary layer interactions under only one set of conditions cannot meet developmental requirements.This paper proposes an adaptive bump control scheme and employs dynamic mesh technology for numerical simulation to investigate the unsteady control effects of adaptive bumps.The obtained results indicate that the use of moving bumps to control shock wave/boundary layer interactions is feasible.The adaptive control effects of five different bump speeds are evaluated.Within the range of bump speeds studied,the analysis of the flow field structure reveals the patterns of change in the separation zone area during the control process,as well as the relationship between the bump motion speed and the control effect on the separation zone.It is concluded that the moving bump endows the boundary layer with additional energy.展开更多
Lipid droplets(LDs)are dynamic organelles interacting with a variety of intracellular organelles.Tracking intracellular LD dynamics employing synthetic small molecules is crucial for biological studies.Fluorescence im...Lipid droplets(LDs)are dynamic organelles interacting with a variety of intracellular organelles.Tracking intracellular LD dynamics employing synthetic small molecules is crucial for biological studies.Fluorescence imaging in the red and near infrared(NIR)region is more suitable for biological imaging due to its low phototoxicity and high signal-to-noise ratio.However,available LD-dyes in the red region with remarkable environmental sensitivity,selectivity for LDs staining are limited.Here,we constructed a red-emission D-π-A-π type LDdye LD 688P with higher environmental sensitivity and suitable“calculated log P”(Clog P)for LDs dynamic imaging.LD 688P was proved to be highly selective and photostable for tracing LD fusion including multiple consecutive fusions and fusions in a centrosymmetric manner by super-resolution microscopy.We believe that the D-π-A-π skeleton would be an efficient strategy to construct red and even NIR-emission dyes.展开更多
文摘Cerium(Ce) compounds have attracted considerable attention as key components in functional coatings due to their many outstanding properties.This work provides a comprehensive review of recent advances in the application of Ce in functional coatings.The role of Ce in the improvement of functional properties such as corrosion-resistance,self-healing,superhydrophobicity,wear-resistance,and UV shielding is reviewed from the perspective of functional mechanism and applied research.Furthermore,the strategies,processes,practical problems,and current challenges in the research of functional coatings containing Ce are summarized and discussed.The objective is to highlight the great potential of Ce in functional coatings,and to explore new applications of Ce in the development of novel coatings.Thus,this work aims to enhance the application value of Ce,solving the problem of unbalanced application of rare-earth elements.
基金supported by the National Natural Science Foundation of China(Nos.22225806,22078314,22278394,22378385)Dalian Institute of Chemical Physics(Nos.DICPI202142,DICPI202436).
文摘The overuse of surfactants has made them well-known environmental pollutants.So far,it is still a challenge to simultaneously distinguish cationic,anionic,zwitterionic,nonionic surfactants and surfactants with similar structures based on traditional analytical techniques.We developed a high-throughput method for distinguishing various surfactants based on the adaptive emission profile as fingerprints(AEPF).The fluorescence response of the sensor was based on the interaction between surfactants and 1,3-diacetylpyrene(o-DAP)probe.The interaction affected the reversible conversion of free molecules and two aggregates in the solution,thereby changing the relative abundance and the fluorescence intensity ratio of two aggregates emitting different fluorescence.The o-DAP sensor can distinguish four types of surfactants(16 surfactants),especially surfactants of the same type with similar structures.The o-DAP sensor sensitively determined the critical micelle concentration(CMC)of 16 surfactants based on the interaction between o-DAP and surfactants.Additionally,the o-DAP sensor can detect and distinguish artificial vesicles made from different surfactants.
基金supported by the National Natural Science Foundation of China (Nos. 22078314, 21878286, 21908216, 22078201, U1908202)。
文摘The unique structure of fluorescent proteins in which the fluorophore is encapsulated by the protein shell to restrict rotation and emit light inspired the screening of chromophores that selectively bind to biomolecules to generate fluorescence. In this paper, we report a curcuminoid-BF2-like fluorescent dye NBF2containing 4-dimethylaniline as an electron-donating group. When this dye is combined with HSA or BSA, the fluorescence is enhanced 90/112-fold, and the fluorescence quantum yield increases from <0.001to 0.16/0.19. Such a large change in fluorescence enhancement is due to the encapsulation of N-BF2in the protein cavity by HSA/BSA, which inhibits the intramolecular rotation of the aniline moiety caused by charge transfer after the fluorophore is excited by light. N-BF2has fast and strong binding to HSA or BSA and was found to be reversible in solution and intracellularly. Since N-BF2also has the ability to target lipid droplets, the complex of N-BF2/HSA realizes the regulation of reversible lipid droplet staining in cells.
基金supported by the National Natural Science Foundation of China(Nos.22278394,22078314 and 21908216)Dalian Institute of Chemical Physics(Nos.DICPI202227 and DICPI202142).
文摘Membrane permeability and intracellular diffusion of fluorescent probes determine staining selectivity of intracellular substructures.However,the relationship between the molecular structure of fluorescent probes and their membrane permeability and intracellular distribution is poorly understood.In this paper,we reported a series of 1,8-naphthalimide dyes and carried out cell imaging experiments,and found that the presence of amino hydrogen in these dyes played a crucial role in their cell membrane permeability and intracellular distribution.The secondary amino group containing compounds 1-4 show excellent membrane permeability and strong fluorescence in living cells.While the tertiary amine containing dyes 5 and 6 can hardly permeate the cell membrane though they show extremely similar structure with compounds 2-4.Compound 1 can selectively image lipid droplets by selecting the wavelength of excitation light.With the specificity for lysosomes,2 and 4 have been used in long-term time-lapses imaging of lysosomal dynamics and tracking the process of lysosome-lysosome interaction,fusion and movement.The effect of hydrogen-containing amino substituent on the cell membrane permeability of fluorescent molecules is promising for the development of better biocompatible probes.
基金supported by the National Natural Science Foundation of China(Nos.22225806,22078314,21908216,22378385)Dalian Institute of Chemical Physics(Nos.DICPI202142,DICPI202436)+1 种基金Agency for Science,Technology and Research(No.A*STAR,Singapore)under its Advanced Manufacturing and Engineering Program(No.A2083c0051)SUTD Kickstarter Initiative(No.SKI 2021_03_10)。
文摘The demand for enhanced optical properties in advanced fluorescence technologies has driven research into the structure-property relationship of fluorophores.In this paper,we use naphthalene fluorophores Na DC-Aze and PhDO-Aze as a case study to emphasize the pivotal role of cross conjugation in tuning the optical structure-property relationship.Na DC-Aze and PhDO-Aze,formed by hybridizing two distinct conjugated systems in a single naphthalene molecule,exhibit spectral characteristics from both conjugated systems.Experimental data and theoretical calculations demonstrate the coexistence of two electron-delocalization systems in a cross-conjugation manner in both Na DC-Aze and PhDO-Aze.The cross-conjugation fluorophores exhibit high brightness,large Stokes shift,and a broad absorption wavelength range by combining distinct spectral properties from its parent fluorophores.These spectral properties will be advantageous for certain applications(i.e.,panchromatic absorption in organic solar cells,and fluorophores compatible with a wide range of excitation wavelengths).
基金supported by the National Natural Science Foundation of China (No. 11972368)the Natural Science Foundation of Hunan Province (No. 2021JJ10045), China。
文摘The aim of this study was to develop robust tracking control schemes for the 3D leap trajectory of hypersonic gliding vehicles using sliding mode theory. A predictor-corrector guidance method was applied to the generation of the reference trajectory, and drag acceleration was selected as the profile of reference tracking. A combined super-twisting sliding mode controller(CST-SMC) is proposed to decrease the tracking error and guarantee the tracking performance in the presence of system nonlinearities compared to three other common controllers: the linear sliding mode controller(L-SMC), global fast terminal sliding mode controller(GFT-SMC), and super-twisting sliding mode controller(ST-SMC). By using the developed controller, the system state of a second-order drag acceleration tracking error system can approach the global fast terminal sliding manifold in finite time. By using the Lyapunov approach, sufficient conditions are deduced to ensure that the tracking performance is obtained for a closed-loop system. Furthermore, we show that the controller is robust to initial uncertain parameters and other perturbations, as validated by simulation results with appropriate gains.
文摘Plant volatile organic compounds (Biogenic Volatile Organic compounds, referred BVOCs) have a significant impact on the atmospheric environment, air quality and human health. This experiment takes Acer truncatum flowers as the research object, uses solid-phase micro-extraction combine GC-MS (SPME-GC-MS) to detect the main component of volatiles released by the flowers from 10 individual trees of Acer truncatum (Acer truncatum Bunge). The results showed that 37 kinds of volatiles were detected and they are belonged to four types organic compouds, such as terpenoids, alcohols, ketones, esters. According to the analysis of the main components of Acer truncatum flower volatiles includes Fluorene, 4,8 -Dimethyl-1,3 (E), 7-Nonene, (cis, trans)-2,6-Dimethyl-2,4,6-triene-Partenkirchen, Myrcene, Basil hexene, 3-Carene, (E)-Basil, Camphene, Caryophyllene, Linalool, α-Terpinolene, O-cymene, 3-Vinyl-1,2-dimethyl-1, Eucalyptus alcohols and Alcohol vinegar-12. However, there were no significant differences between individual trees in terms of obscure material O-cymene, Eucalyptus alcohols, Alcohol vinegar-12, as well as the significant differences in terms of remaining volatiles.
基金supported by Central Fiscal Forestry Science and Technology Extension Demonstration Fund Project(No.2016LZGC014)a Major Agricultural Project of Shandong Province(No.[2012] 213 and [2014] 96)Shandong "Double Tops" Program
文摘Acer truncatum is considered a promising species as a raw material to produce nervonic acid(NA). The goal of this study was to explore the variation of oil content and nervonic acid content of 138 accessions native to 14 regions in China as well as provide guidance for establishing plantations and improving the production of nervonic acid. A large range of variation was found in oil content, nervonic acid per gram of oil, and nervonic acid per gram of seed(17.81%–36.56%, 3.90%–7.85%, and 0.84%–2.31%, respectively). Accessions YS-6, ABZ-6 and DQTL-8 were found as the most promising potential oil sources; PQ-2 was considered the optimal germplasm, and JY-6, NJ-8, LF-6, and CC-8 were found as promising potential sources for producing NA. A very significant difference(P < 0.01) among 14 regions was observed. DQTL and YS regions are considered the optimal farming regions for crops with high oil content, while the CC and PQ regions are regarded as the most suitable regions for nervonic acid production. A geographical trend from South to North was observed in which amount of seed oil increased but no such trend in nervonic acid content was observed. The data collected in the study on oil content and nervonic acid in accessions of A. truncatum in various regions can be utilized for establishing plantations of promising genotypes through clonal means.
基金supported by the National Key R&D Program of China(Grant No.2019YFA0405300)the National Natural Science Foundation of China(Grant No.11972368)the Natural Science Foundation of Hunan Province(Grant No.2021JJ10045).
文摘The stability of supersonic inlets faces challenges due to various changes in flight conditions,and flow control methods that address shock wave/boundary layer interactions under only one set of conditions cannot meet developmental requirements.This paper proposes an adaptive bump control scheme and employs dynamic mesh technology for numerical simulation to investigate the unsteady control effects of adaptive bumps.The obtained results indicate that the use of moving bumps to control shock wave/boundary layer interactions is feasible.The adaptive control effects of five different bump speeds are evaluated.Within the range of bump speeds studied,the analysis of the flow field structure reveals the patterns of change in the separation zone area during the control process,as well as the relationship between the bump motion speed and the control effect on the separation zone.It is concluded that the moving bump endows the boundary layer with additional energy.
基金supported by the National Natural Science Foundation of China(22078314,21878286,and 21908216)Dalian Institute of Chemical Physics(DICPI202142,DICPI201938,and DICPZZBS201805)+1 种基金the support from A^(*)STAR under its Advanced Manufacturing and Engineering Program(A2083c0051)the Ministry of Education,Singapore(MOE-MOET2EP10120-0007)
文摘Lipid droplets(LDs)are dynamic organelles interacting with a variety of intracellular organelles.Tracking intracellular LD dynamics employing synthetic small molecules is crucial for biological studies.Fluorescence imaging in the red and near infrared(NIR)region is more suitable for biological imaging due to its low phototoxicity and high signal-to-noise ratio.However,available LD-dyes in the red region with remarkable environmental sensitivity,selectivity for LDs staining are limited.Here,we constructed a red-emission D-π-A-π type LDdye LD 688P with higher environmental sensitivity and suitable“calculated log P”(Clog P)for LDs dynamic imaging.LD 688P was proved to be highly selective and photostable for tracing LD fusion including multiple consecutive fusions and fusions in a centrosymmetric manner by super-resolution microscopy.We believe that the D-π-A-π skeleton would be an efficient strategy to construct red and even NIR-emission dyes.
