纳米塑料(NPs)与纳米活性炭(NAC)在环境中的共迁移会影响其环境行为。本研究探究了在模拟水溶液中,电解质和pH对不同表面改性的聚苯乙烯纳米颗粒(PSNPs)与NAC异型凝聚的影响。研究发现,由于静电斥力不同,在300 mM NaCl中,随着pH升高,APS...纳米塑料(NPs)与纳米活性炭(NAC)在环境中的共迁移会影响其环境行为。本研究探究了在模拟水溶液中,电解质和pH对不同表面改性的聚苯乙烯纳米颗粒(PSNPs)与NAC异型凝聚的影响。研究发现,由于静电斥力不同,在300 mM NaCl中,随着pH升高,APS(带氨基的PSNPs)与BPS(无表面修饰的PSNPs)的凝聚速率都呈大体下降趋势;在10 mM CaCl_(2)中,APS与NAC在高pH时发生凝聚,BPS与NAC在所有pH下均稳定分散。本研究有助于理解NPs与NAC在水环境中的异型凝聚行为。展开更多
Regulating the surface plasmon resonance(SPR)of metallic nanostructures is of great interests for optical and catalytic applications,however,it is still a great challenge for tuning SPR features of small metallic nano...Regulating the surface plasmon resonance(SPR)of metallic nanostructures is of great interests for optical and catalytic applications,however,it is still a great challenge for tuning SPR features of small metallic nanoparticles(<10 nm).In this work,we design a unique dielectric support-urchin-like mesoporous silica nanoparticles(U-SiO_(2))with ordered long spikes on its surface,which can well enhance the SPR properties of~3 nm gold nanocrystals(AuNCs).The U-SiO_(2)not only realizes the uniform self-assembly of AuNCs,but also prevents their aggregation due to the unique confinement effect.The finite-difference time-domain simulations show that the AuNCs on U-SiO_(2)can generate plasmonic hot spots with highly enhanced electromagnetic field.Moreover,the hot electrons can be effectively and rapidly transferred through the interface junction to TiO_(2).Thus,a high visible-light-driven photocatalytic activity can be observed,which is 3.8 times higher than that of smooth photocatalysts.The concept of dielectric supports engineering provides a new strategy for tuning SPR of small metallic nanocrystals towards the development of advanced plasmon-based applications.展开更多
文摘纳米塑料(NPs)与纳米活性炭(NAC)在环境中的共迁移会影响其环境行为。本研究探究了在模拟水溶液中,电解质和pH对不同表面改性的聚苯乙烯纳米颗粒(PSNPs)与NAC异型凝聚的影响。研究发现,由于静电斥力不同,在300 mM NaCl中,随着pH升高,APS(带氨基的PSNPs)与BPS(无表面修饰的PSNPs)的凝聚速率都呈大体下降趋势;在10 mM CaCl_(2)中,APS与NAC在高pH时发生凝聚,BPS与NAC在所有pH下均稳定分散。本研究有助于理解NPs与NAC在水环境中的异型凝聚行为。
基金This work was supported by the National Key Research and Development Program of China(No.2018YFE0201701)the National Natural Science Foundation of China(Nos.21975050,21905052,11975081,and 22105041)+3 种基金Science and Technology Commission of Shanghai Municipality(No.21ZR1408800)Key Basic Research Program of Science and Technology Commission of Shanghai Municipality(No.19JC1410700)the Program of Shanghai Academic Research Leader(No.21XD1420800)Guangdong Basic and Applied Basic Research Foundation(No.2021A1515010108).
文摘Regulating the surface plasmon resonance(SPR)of metallic nanostructures is of great interests for optical and catalytic applications,however,it is still a great challenge for tuning SPR features of small metallic nanoparticles(<10 nm).In this work,we design a unique dielectric support-urchin-like mesoporous silica nanoparticles(U-SiO_(2))with ordered long spikes on its surface,which can well enhance the SPR properties of~3 nm gold nanocrystals(AuNCs).The U-SiO_(2)not only realizes the uniform self-assembly of AuNCs,but also prevents their aggregation due to the unique confinement effect.The finite-difference time-domain simulations show that the AuNCs on U-SiO_(2)can generate plasmonic hot spots with highly enhanced electromagnetic field.Moreover,the hot electrons can be effectively and rapidly transferred through the interface junction to TiO_(2).Thus,a high visible-light-driven photocatalytic activity can be observed,which is 3.8 times higher than that of smooth photocatalysts.The concept of dielectric supports engineering provides a new strategy for tuning SPR of small metallic nanocrystals towards the development of advanced plasmon-based applications.
