To further advance the development of the fluorescent dyes for latent fingerprint imaging,two triphenylamine-based Schiff base compounds containing a benzimidazole group(TPA-BZI)and a phenyl unit(TPA-Ph)were designed ...To further advance the development of the fluorescent dyes for latent fingerprint imaging,two triphenylamine-based Schiff base compounds containing a benzimidazole group(TPA-BZI)and a phenyl unit(TPA-Ph)were designed and synthesized.Photoluminescence experiments revealed that both compounds exhibited solvatochromism and intramolecular charge transfer(ICT)characteristics in six organic solvents.Additionally,they showed aggregation-induced emission(AIE)in CH_(3)OH/water mixtures and solid-state fluorescence.These phenomena were further elucidated through time-dependent density functional theory(TD-DFT)calculations.It was also found that the two compounds could be used for latent fingerprints imaging,and could easily distinguish the details of fingerprints from Ⅰ to Ⅲ levels,which could provide the preliminary evidence to match personal identification.展开更多
Graphdiyne represents an emerging nanofiller of mixed matrix membranes for high-performance alcohol recovery by pervaporation due to its unique alkyne-rich and porous framework and hydrophobicity.However,such membrane...Graphdiyne represents an emerging nanofiller of mixed matrix membranes for high-performance alcohol recovery by pervaporation due to its unique alkyne-rich and porous framework and hydrophobicity.However,such membranes often encounter a persistent challenge of nanofiller agglomeration within the polymer matrix,which diminishes the efficacy of graphdiyne during alcohol recovery.This study proposes a multilevel dispersion strategy that synergistically combines in situ confined growth,ultrasonication,atomization,and rotational shearing throughout membrane preparation to mitigate particle aggregation.The particle agglomeration scale in the polydimethylsiloxane matrix can be effectively reduced from 660 nm of triphenylamine-based graphdiyne to about 291 nm compared to the general stirring-casting method.The mixed matrix membrane loaded with 2.5 wt%triphenylamine-based graphdiyne demonstrated a permeate flux of 2.35 kg·m^(-2)·h^(-1) alongside a separation factor of 11.31 for a 5 wt% ethanol/water solution.Compared to the stirring-casting method,these performances represent enhancements of 41% in permeate flux and 80% in separation factor.Furthermore,a 96 h-continuous pervaporation test indicated the robust stability of the membrane,underscoring the potential for industrial alcohol recovery.展开更多
文摘To further advance the development of the fluorescent dyes for latent fingerprint imaging,two triphenylamine-based Schiff base compounds containing a benzimidazole group(TPA-BZI)and a phenyl unit(TPA-Ph)were designed and synthesized.Photoluminescence experiments revealed that both compounds exhibited solvatochromism and intramolecular charge transfer(ICT)characteristics in six organic solvents.Additionally,they showed aggregation-induced emission(AIE)in CH_(3)OH/water mixtures and solid-state fluorescence.These phenomena were further elucidated through time-dependent density functional theory(TD-DFT)calculations.It was also found that the two compounds could be used for latent fingerprints imaging,and could easily distinguish the details of fingerprints from Ⅰ to Ⅲ levels,which could provide the preliminary evidence to match personal identification.
基金financially supported by the National Key Research and Development Program of China(Grant No.2022YFB3804802)the National Natural Science Foundation of China(Grant No.22322801)the Fundamental Research Funds for the Central Universities(Grant No.buctrc202508).
文摘Graphdiyne represents an emerging nanofiller of mixed matrix membranes for high-performance alcohol recovery by pervaporation due to its unique alkyne-rich and porous framework and hydrophobicity.However,such membranes often encounter a persistent challenge of nanofiller agglomeration within the polymer matrix,which diminishes the efficacy of graphdiyne during alcohol recovery.This study proposes a multilevel dispersion strategy that synergistically combines in situ confined growth,ultrasonication,atomization,and rotational shearing throughout membrane preparation to mitigate particle aggregation.The particle agglomeration scale in the polydimethylsiloxane matrix can be effectively reduced from 660 nm of triphenylamine-based graphdiyne to about 291 nm compared to the general stirring-casting method.The mixed matrix membrane loaded with 2.5 wt%triphenylamine-based graphdiyne demonstrated a permeate flux of 2.35 kg·m^(-2)·h^(-1) alongside a separation factor of 11.31 for a 5 wt% ethanol/water solution.Compared to the stirring-casting method,these performances represent enhancements of 41% in permeate flux and 80% in separation factor.Furthermore,a 96 h-continuous pervaporation test indicated the robust stability of the membrane,underscoring the potential for industrial alcohol recovery.
