By varying concentration of PEG1000 as a structure-directing agent,mesoporous alumina with excellent textural properties was synthesized.The prepared mesoporous alumina displays high thermal stability,as shown by its ...By varying concentration of PEG1000 as a structure-directing agent,mesoporous alumina with excellent textural properties was synthesized.The prepared mesoporous alumina displays high thermal stability,as shown by its textural properties at different calcination temperatures of 600-850 °C.Characterization by SEM and TEM revealed that the added PEG surfactant induced the formation of petal-like alumina.XRD results clarified that all samples were amorphous and their peaks were around the peaks of γ-alumina.N_2 adsorption-desorption analysis showed that the prepared mesoporous alumina,if with PEG1000 in hydrolysis of aluminum isopropoxide,had excellent textural properties with large specific surface area,high pore volume and suitable pore size.The petal-like structure existing in the alumina samples improved their textural parameters,and the role and influential mechanism of PEG1000 were analyzed.展开更多
采用廉价的聚乙二醇(PEG)/酒石酸钾钠建立双水相体系,从干螺旋藻中分离纯化藻蓝蛋白C-PC。以纯度(目的蛋白在620 nm处的特征吸光值和总蛋白在280 nm处吸光值的比值)为指标,优化体系参数。研究结果表明,体系p H 8.06,系线长为21.65%、体...采用廉价的聚乙二醇(PEG)/酒石酸钾钠建立双水相体系,从干螺旋藻中分离纯化藻蓝蛋白C-PC。以纯度(目的蛋白在620 nm处的特征吸光值和总蛋白在280 nm处吸光值的比值)为指标,优化体系参数。研究结果表明,体系p H 8.06,系线长为21.65%、体积比为0.22的PEG1000和酒石酸钾钠双水相体系分离纯化效果最好,纯度由0.42提高到1.27,高于食品级纯度0.7,纯化因子3.04,回收率85.11%。硫酸铵盐析提高粗提液纯度后,二次双水相纯度达到3.28,高于药品级3.0。得到的C-PC具有较高的生物活性。展开更多
The phase behavior of supercritical (SC) CO2 + PEG 1000 (PEG with average molecular weight of 1000 g/mol) + n-butanol system was studied. It was demonstrated that SC CO2 could induce phase separation of PEG 1000 + n-b...The phase behavior of supercritical (SC) CO2 + PEG 1000 (PEG with average molecular weight of 1000 g/mol) + n-butanol system was studied. It was demonstrated that SC CO2 could induce phase separation of PEG 1000 + n-butanol system under suitable conditions. This hints that SC CO2 has potential applications in the separation of mixtures of PEG + organic compound.展开更多
在三氟化硼V(乙醚)∶V(乙酸)=4∶5的混合电解质体系中直接氧化芴,获得芴聚合物膜,其电导率为0.5 S cm-1,高于在纯三氟化硼乙醚中制得的聚芴的电导率0.25 S cm-1.在三氟化硼乙醚∶乙酸=4∶5的混合电解质体系中获得的聚芴膜具有良好的电...在三氟化硼V(乙醚)∶V(乙酸)=4∶5的混合电解质体系中直接氧化芴,获得芴聚合物膜,其电导率为0.5 S cm-1,高于在纯三氟化硼乙醚中制得的聚芴的电导率0.25 S cm-1.在三氟化硼乙醚∶乙酸=4∶5的混合电解质体系中获得的聚芴膜具有良好的电化学性质和化学稳定性.FTIR,1H-NMR和量化计算表明反应发生在2,7位.紫外和荧光实验表明电解质中少量聚乙二醇1000的存在有利于聚合链的增长.电镜分析,含聚乙二醇1000情况下制备的聚芴膜外观形貌上为更大的片状物,堆叠更为有序.同时荧光光谱表明聚合物是一种良好的蓝色荧光材料,热重分析表明该混合体系中形成聚芴的热稳定性要优于纯三氟化硼乙醚中获得的聚合物.展开更多
基金Supported by the National Basic Research Program of China(Y419012198)the National Natural Science Foundation of China(No.91534125)
文摘By varying concentration of PEG1000 as a structure-directing agent,mesoporous alumina with excellent textural properties was synthesized.The prepared mesoporous alumina displays high thermal stability,as shown by its textural properties at different calcination temperatures of 600-850 °C.Characterization by SEM and TEM revealed that the added PEG surfactant induced the formation of petal-like alumina.XRD results clarified that all samples were amorphous and their peaks were around the peaks of γ-alumina.N_2 adsorption-desorption analysis showed that the prepared mesoporous alumina,if with PEG1000 in hydrolysis of aluminum isopropoxide,had excellent textural properties with large specific surface area,high pore volume and suitable pore size.The petal-like structure existing in the alumina samples improved their textural parameters,and the role and influential mechanism of PEG1000 were analyzed.
文摘采用廉价的聚乙二醇(PEG)/酒石酸钾钠建立双水相体系,从干螺旋藻中分离纯化藻蓝蛋白C-PC。以纯度(目的蛋白在620 nm处的特征吸光值和总蛋白在280 nm处吸光值的比值)为指标,优化体系参数。研究结果表明,体系p H 8.06,系线长为21.65%、体积比为0.22的PEG1000和酒石酸钾钠双水相体系分离纯化效果最好,纯度由0.42提高到1.27,高于食品级纯度0.7,纯化因子3.04,回收率85.11%。硫酸铵盐析提高粗提液纯度后,二次双水相纯度达到3.28,高于药品级3.0。得到的C-PC具有较高的生物活性。
文摘The phase behavior of supercritical (SC) CO2 + PEG 1000 (PEG with average molecular weight of 1000 g/mol) + n-butanol system was studied. It was demonstrated that SC CO2 could induce phase separation of PEG 1000 + n-butanol system under suitable conditions. This hints that SC CO2 has potential applications in the separation of mixtures of PEG + organic compound.
文摘在三氟化硼V(乙醚)∶V(乙酸)=4∶5的混合电解质体系中直接氧化芴,获得芴聚合物膜,其电导率为0.5 S cm-1,高于在纯三氟化硼乙醚中制得的聚芴的电导率0.25 S cm-1.在三氟化硼乙醚∶乙酸=4∶5的混合电解质体系中获得的聚芴膜具有良好的电化学性质和化学稳定性.FTIR,1H-NMR和量化计算表明反应发生在2,7位.紫外和荧光实验表明电解质中少量聚乙二醇1000的存在有利于聚合链的增长.电镜分析,含聚乙二醇1000情况下制备的聚芴膜外观形貌上为更大的片状物,堆叠更为有序.同时荧光光谱表明聚合物是一种良好的蓝色荧光材料,热重分析表明该混合体系中形成聚芴的热稳定性要优于纯三氟化硼乙醚中获得的聚合物.
