Polydopamine-based melanin-like materials have been widely used in the fields of ultraviolet(UV)shielding,solar desalination and anti-inflammatory treatment owing to their unique physical properties.The well-establish...Polydopamine-based melanin-like materials have been widely used in the fields of ultraviolet(UV)shielding,solar desalination and anti-inflammatory treatment owing to their unique physical properties.The well-established synthesis of polydopamine nanoparticles involves the oxidative polymerization of dopamine-derived monomers,resulting in cross-linked nanostructures with high complexity and heterogeneity.Therefore,the controlled synthesis of polydopamine-based melanin-like materials with well-defined structures and predictable properties remains challenging.Herein,we propose a mechanochemical Suzuki polymerization approach for the synthesis of linear melanin-like polymers with tunable physical properties.Compared with polydopamine nanoparticles,the mechanochemical approach offers a more flexible chain-like structure,thereby enhancing its antioxidant performance.Furthermore,this approach also enables the preparation of a melanin-like alternating copolymer that exhibits green fluorescence owing to itsπ-conjugated structure.This study not only offers opportunities for exploring novel synthetic melanin materials,but also provides new insights into the structure-function relationships of polydopamine-based materials.展开更多
Cyclic polymers exhibit fascinating crystallization behaviors owing to the absence of chain ends and more compact conformations.In the current simulation,dynamic Monte Carlo simulations were performed to reveal the un...Cyclic polymers exhibit fascinating crystallization behaviors owing to the absence of chain ends and more compact conformations.In the current simulation,dynamic Monte Carlo simulations were performed to reveal the underlying mechanism of the effect of chain topology and chain length on crystallization of polymer in solutions containing one-dimensional nanofiller.Simulation results suggested that the filled cyclic polymers exhibit higher melting temperature,higher crystallization temperature,and faster crystallization rate than the analogous linear polymers of identical chain length,especially in the systems with relatively short chains.Based on the Thomson-Gibbs equation,we theoretically analyzed the difference in the melting point between the cyclic and linear polymers under different chain lengths,and derived the dependence of the ratio of the melting point of the linear polymers to that of its cyclic analogs on chain length.In addition,it was also observed that the nanofiller can induce the formation of nanohybrid shish-kebab structure during isothermal crystallization of all systems.展开更多
Here we use nor-seco-cucurbit[10]uril(ns-CB[10]) based ternary complexation to construct [5]rotaxane,linear supramolecular dynamic rotaxane polymers and cubic 3D supramolecular organic framework.A [5]rotaxane is const...Here we use nor-seco-cucurbit[10]uril(ns-CB[10]) based ternary complexation to construct [5]rotaxane,linear supramolecular dynamic rotaxane polymers and cubic 3D supramolecular organic framework.A [5]rotaxane is constructed by ns-CB[10], TMe CB[6] and short linear derivatives of 4,4'-bipyridinium(M2). ns-CB[10], CB[7] and long linear derivatives of 4,4'-bipyridinium(M3) self-assemble into a linear supramolecular dynamic rotaxane polymer. ns-CB[10] and tetracationic tetrahedral monomer selfassemble and form a three-dimensional supramolecular organic framework. The above results demonstrate that ns-CB[10]-based ternary complexation is a versatile platform to build various supramolecular systems.展开更多
CONSPECTUS:The microfluidic biochemical/immunoassay systems typically consist of microfluidic chips,fluid driving devices,and detection components.The core of the system is the microfluidic chips based on microfluidic...CONSPECTUS:The microfluidic biochemical/immunoassay systems typically consist of microfluidic chips,fluid driving devices,and detection components.The core of the system is the microfluidic chips based on microfluidic technology,which are typically constructed with nonresponsive materials such as silicon,glass,and rigid plastics,thus requiring complex external air/liquid pumps to manipulate the samples.The external equipment renders the microfluidic systems cumbersome and increases the risk of biosample contamination.展开更多
A new Dy-based coordination polymer, namely {[Dy（cptpy）_2（H_2O）_2]（TPT）（Cl）}_n（1, Hcptpy = 4-（4-carboxyphenyl）-4,2？：6？,4？？-terpyridine, TPT = 2,4,6-tri（4-pyridyl）-1,3,5-triazine, DMA = N,N-dimethylac...A new Dy-based coordination polymer, namely {[Dy（cptpy）_2（H_2O）_2]（TPT）（Cl）}_n（1, Hcptpy = 4-（4-carboxyphenyl）-4,2？：6？,4？？-terpyridine, TPT = 2,4,6-tri（4-pyridyl）-1,3,5-triazine, DMA = N,N-dimethylacetamide） has been solvothermally synthesized by the reactions of DyCl_3, Hcptpy and TPT in a mixture solvent of DMA and H_2O. Single-crystal X-ray structural analysis reveals that 1 is a 1D linear chain coordination polymer with quadrangle channels which are occupied by the TPT ligands. The compound has been characterized by singe-crystal analyses, thermogravimetry analyses and powder X-ray diffraction measurements. The antitumor activity of compound 1 and its corresponding organic ligands Hcptpy and TPT were then investigated against four human lung cancer cell lines（NCI-H460, Calu-3, A549 and NCI-H292） by MTT assay. It was found that compared with Hcptpy and TPT, compound 1 exerted rather potent activity against all of these cell lines.展开更多
Since the discovery of doped polyacetylene over four decades ago,significant advances have been made in understanding charge transport and metallic behavior in linear conductive polymers[1].Traditional models emphasiz...Since the discovery of doped polyacetylene over four decades ago,significant advances have been made in understanding charge transport and metallic behavior in linear conductive polymers[1].Traditional models emphasize intrachain coupling within large conjugated systems,with charge transport occurring along the conjugated chain direction,while interchain hopping serves as a secondary conduction mechanism[2].展开更多
基金supported by the National Natural Science Foundation of China(Nos.22471185 and 52225311)Science and Technology Program of Suzhou(No.ZXL2022480)+1 种基金Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)Program of Innovative Research Team of Soochow University。
文摘Polydopamine-based melanin-like materials have been widely used in the fields of ultraviolet(UV)shielding,solar desalination and anti-inflammatory treatment owing to their unique physical properties.The well-established synthesis of polydopamine nanoparticles involves the oxidative polymerization of dopamine-derived monomers,resulting in cross-linked nanostructures with high complexity and heterogeneity.Therefore,the controlled synthesis of polydopamine-based melanin-like materials with well-defined structures and predictable properties remains challenging.Herein,we propose a mechanochemical Suzuki polymerization approach for the synthesis of linear melanin-like polymers with tunable physical properties.Compared with polydopamine nanoparticles,the mechanochemical approach offers a more flexible chain-like structure,thereby enhancing its antioxidant performance.Furthermore,this approach also enables the preparation of a melanin-like alternating copolymer that exhibits green fluorescence owing to itsπ-conjugated structure.This study not only offers opportunities for exploring novel synthetic melanin materials,but also provides new insights into the structure-function relationships of polydopamine-based materials.
基金the National Natural Science Foundation of China(No.21404050)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX19_1593).
文摘Cyclic polymers exhibit fascinating crystallization behaviors owing to the absence of chain ends and more compact conformations.In the current simulation,dynamic Monte Carlo simulations were performed to reveal the underlying mechanism of the effect of chain topology and chain length on crystallization of polymer in solutions containing one-dimensional nanofiller.Simulation results suggested that the filled cyclic polymers exhibit higher melting temperature,higher crystallization temperature,and faster crystallization rate than the analogous linear polymers of identical chain length,especially in the systems with relatively short chains.Based on the Thomson-Gibbs equation,we theoretically analyzed the difference in the melting point between the cyclic and linear polymers under different chain lengths,and derived the dependence of the ratio of the melting point of the linear polymers to that of its cyclic analogs on chain length.In addition,it was also observed that the nanofiller can induce the formation of nanohybrid shish-kebab structure during isothermal crystallization of all systems.
基金supports from the National Natural Science Foundation of China(Nos.21890732,21890730 and 21921003)。
文摘Here we use nor-seco-cucurbit[10]uril(ns-CB[10]) based ternary complexation to construct [5]rotaxane,linear supramolecular dynamic rotaxane polymers and cubic 3D supramolecular organic framework.A [5]rotaxane is constructed by ns-CB[10], TMe CB[6] and short linear derivatives of 4,4'-bipyridinium(M2). ns-CB[10], CB[7] and long linear derivatives of 4,4'-bipyridinium(M3) self-assemble into a linear supramolecular dynamic rotaxane polymer. ns-CB[10] and tetracationic tetrahedral monomer selfassemble and form a three-dimensional supramolecular organic framework. The above results demonstrate that ns-CB[10]-based ternary complexation is a versatile platform to build various supramolecular systems.
基金financially supported by the National Natural Science Foundation of China(51927805,52233001)the Innovation Program of Shanghai Municipal Education Commission(2023ZKZD07).
文摘CONSPECTUS:The microfluidic biochemical/immunoassay systems typically consist of microfluidic chips,fluid driving devices,and detection components.The core of the system is the microfluidic chips based on microfluidic technology,which are typically constructed with nonresponsive materials such as silicon,glass,and rigid plastics,thus requiring complex external air/liquid pumps to manipulate the samples.The external equipment renders the microfluidic systems cumbersome and increases the risk of biosample contamination.
基金supported by the grants from the Health and Family Planning Commission of Guizhou Province(gzwjkj2015-1-023)the Guizhou Province Science&Cooperative Project of 2015(No.7126)the Guiyang Science and Technology Project of 20141001(No.61)
文摘A new Dy-based coordination polymer, namely {[Dy（cptpy）_2（H_2O）_2]（TPT）（Cl）}_n（1, Hcptpy = 4-（4-carboxyphenyl）-4,2？：6？,4？？-terpyridine, TPT = 2,4,6-tri（4-pyridyl）-1,3,5-triazine, DMA = N,N-dimethylacetamide） has been solvothermally synthesized by the reactions of DyCl_3, Hcptpy and TPT in a mixture solvent of DMA and H_2O. Single-crystal X-ray structural analysis reveals that 1 is a 1D linear chain coordination polymer with quadrangle channels which are occupied by the TPT ligands. The compound has been characterized by singe-crystal analyses, thermogravimetry analyses and powder X-ray diffraction measurements. The antitumor activity of compound 1 and its corresponding organic ligands Hcptpy and TPT were then investigated against four human lung cancer cell lines（NCI-H460, Calu-3, A549 and NCI-H292） by MTT assay. It was found that compared with Hcptpy and TPT, compound 1 exerted rather potent activity against all of these cell lines.
文摘Since the discovery of doped polyacetylene over four decades ago,significant advances have been made in understanding charge transport and metallic behavior in linear conductive polymers[1].Traditional models emphasize intrachain coupling within large conjugated systems,with charge transport occurring along the conjugated chain direction,while interchain hopping serves as a secondary conduction mechanism[2].
