We demonstrated a simple and effective dual-templating approach for the synthesis of hierarchically mesocellular carbon foams by using nonionic surfactant of sorbitan monooleate and silica colloid particles as sacrifi...We demonstrated a simple and effective dual-templating approach for the synthesis of hierarchically mesocellular carbon foams by using nonionic surfactant of sorbitan monooleate and silica colloid particles as sacrificial templates, and resorcinol/ formaldehyde as carbon source. The representative carbon foam has dual mesopore sizes of 4 and 10 nm, and possesses the specific surface area of 580 m^2/g and the total pore volume of 0.80 cm^3/g.展开更多
An improved glucose sensitive membrane(GSM)is prepared by immobilizing glucose oxidase(GOD)onto a mixture of silica mesocellular foams(SiMCFs)and SiO2 nanoparticles(SiNPs)and then trapping it in a polyvinyl alcohol(PV...An improved glucose sensitive membrane(GSM)is prepared by immobilizing glucose oxidase(GOD)onto a mixture of silica mesocellular foams(SiMCFs)and SiO2 nanoparticles(SiNPs)and then trapping it in a polyvinyl alcohol(PVA)gel.The membrane is coated onto a gold-glass sheet to create a surface plasmon resonance(SPR)sensor.A series of experiments are conducted to determine the optimized parameters of the proposed GSM.For a GSM with a component ratio of SiMCFs:SiNPs=7:3(mass rate),the resonance angle of the sensor decreases from 68.57°to 63.36°,and the average sensitivity is 0.026°/(mg/dL)in a glucose concentration range of 0 mg/dL‒200 mg/dL.For a GSM with a component ratio of SiMCFs:SiNPs=5:5(mass rate),the resonance angle of the sensor decreases from 67.93°to 63.50°,and the sensitivity is 0.028°/(mg/dL)in a glucose concentration range of 0 mg/dL‒160 mg/dL.These data suggest that the sensor proposed in this study is more sensitive and has a broader measurement range compared with those reported in the literature to date.展开更多
基金supported by the National Natural Science Foundation of China(Nos.20473057 and 20673076)Shanghai Nanotechnology Promotion Center(Nos.0652nm030 and 0752nm006).
文摘We demonstrated a simple and effective dual-templating approach for the synthesis of hierarchically mesocellular carbon foams by using nonionic surfactant of sorbitan monooleate and silica colloid particles as sacrificial templates, and resorcinol/ formaldehyde as carbon source. The representative carbon foam has dual mesopore sizes of 4 and 10 nm, and possesses the specific surface area of 580 m^2/g and the total pore volume of 0.80 cm^3/g.
基金Supported by the National Basic Research Program of China (973 Program,2006CB806103)the National Natural Science Foundation of China (20773027,20633030)the Shanghai Research Institute of Petrochemical Technology,and the Science and Technology Commission of Shanghai Municipality (08DZ2270500)
文摘文章采用巯基丙基三甲氧基硅烷(MPTMS)对介孔泡沫二氧化硅(mesocellular silica foam,MCF)进行接枝磺化,制备了Pr-SO3H/MCF固体酸催化剂,并考察了苯基三甲氧基硅烷疏水改性对苯甲酸甲酯合成的影响。采用氮气吸附脱附(BET)、透射电子显微镜(transmission electron microscope,TEM)、接触角、元素分析仪等手段对催化剂进行表征。结果表明,苯基三甲氧基硅烷改性后的Ph/Pr-SO3H/MCF催化剂,比表面积略有降低,疏水性明显提高。由于苯环与苯环之间形成π-π键,增加了对反应物苯甲酸的吸附能力,在催化剂表面形成了高浓度苯甲酸微区,从而增加了酯化反应速率。同时由于表面的疏水性使得副产物水快速排出催化剂表面,避免催化剂水合,提高了催化剂的耐水性及稳定性。
基金This work was funded by the National Natural Science Foundation of China(Grant No.61575151).
文摘An improved glucose sensitive membrane(GSM)is prepared by immobilizing glucose oxidase(GOD)onto a mixture of silica mesocellular foams(SiMCFs)and SiO2 nanoparticles(SiNPs)and then trapping it in a polyvinyl alcohol(PVA)gel.The membrane is coated onto a gold-glass sheet to create a surface plasmon resonance(SPR)sensor.A series of experiments are conducted to determine the optimized parameters of the proposed GSM.For a GSM with a component ratio of SiMCFs:SiNPs=7:3(mass rate),the resonance angle of the sensor decreases from 68.57°to 63.36°,and the average sensitivity is 0.026°/(mg/dL)in a glucose concentration range of 0 mg/dL‒200 mg/dL.For a GSM with a component ratio of SiMCFs:SiNPs=5:5(mass rate),the resonance angle of the sensor decreases from 67.93°to 63.50°,and the sensitivity is 0.028°/(mg/dL)in a glucose concentration range of 0 mg/dL‒160 mg/dL.These data suggest that the sensor proposed in this study is more sensitive and has a broader measurement range compared with those reported in the literature to date.
