Y 2O 3 nanoparticles organosol coated with DBS was prepared by microemulsion method. The optimum preparative conditions of Y 2O 3 nanoparticles organosol were obtained. TEM analysis indicates that the prepared Y ...Y 2O 3 nanoparticles organosol coated with DBS was prepared by microemulsion method. The optimum preparative conditions of Y 2O 3 nanoparticles organosol were obtained. TEM analysis indicates that the prepared Y 2O 3 nanoparticles are spherical in shape. The size is about 5 nm. The size distribution is in the narrow range and no agglomerates are observed. Y 2O 3 nanoparticles coated with DBS are easy to dissolve in weak polar solvents.展开更多
Silver and gold organosols are easily prepared by transferring nanoparticles from aqueous phase into isooctane with high efficiency (>90%). Concentrations of sodium oleate and magnesium chloride have crucial effe...Silver and gold organosols are easily prepared by transferring nanoparticles from aqueous phase into isooctane with high efficiency (>90%). Concentrations of sodium oleate and magnesium chloride have crucial effects on the transfer efficiency. Based on the UV-visible absorption spectra, TEM micrographs of nanoparticles, as well as molecular modeling calculation about the adsorption conformation of sodium oleate molecules, a possible phase transfer mechanism is proposed.展开更多
This paper reported a gradual disassembly of the chemical components of hardwood,starting with hot-water extraction(HWE)for the removal of hemicelluloses,followed by organosolv delignification to remove the lignin.Und...This paper reported a gradual disassembly of the chemical components of hardwood,starting with hot-water extraction(HWE)for the removal of hemicelluloses,followed by organosolv delignification to remove the lignin.Under mild acid conditions,in addition to hemicelluloses,lower molecular weight lignin fractions were removed(~15%of the total lignin)in the HWE pre-treatment;also,the cleavage of the acid-labile lignin-carbohydrate bond took place to some extent.As a result,the HWE pretreatment promoted the subsequent delignification process and facilitated the lignin recovery from the spent liquor,in terms of higher delignification efficiency and higher purity of the lignin recovered from the spent liquor.The effects of the HWE pre-treatment prior to the delignification process were investigated in this study for both the oxygen-pressurized acetone-water(AWO)and the ALCELL processes,with focuses on the delignification efficiency and the properties of the lignin recovered from the process spent liquor.展开更多
文摘Y 2O 3 nanoparticles organosol coated with DBS was prepared by microemulsion method. The optimum preparative conditions of Y 2O 3 nanoparticles organosol were obtained. TEM analysis indicates that the prepared Y 2O 3 nanoparticles are spherical in shape. The size is about 5 nm. The size distribution is in the narrow range and no agglomerates are observed. Y 2O 3 nanoparticles coated with DBS are easy to dissolve in weak polar solvents.
基金supports from the National Natural Science Foundation of China(20073025,20373035)Specialized Research Fund for the Doctoral Program of Higher Education(20020422060)+1 种基金Excellent Middle,Young Scientists Awarding Found of Shandong Province(01BS21)Visiting Scholar Foundation of Key Laboratory in University,Ministry of Education,China.
文摘Silver and gold organosols are easily prepared by transferring nanoparticles from aqueous phase into isooctane with high efficiency (>90%). Concentrations of sodium oleate and magnesium chloride have crucial effects on the transfer efficiency. Based on the UV-visible absorption spectra, TEM micrographs of nanoparticles, as well as molecular modeling calculation about the adsorption conformation of sodium oleate molecules, a possible phase transfer mechanism is proposed.
文摘This paper reported a gradual disassembly of the chemical components of hardwood,starting with hot-water extraction(HWE)for the removal of hemicelluloses,followed by organosolv delignification to remove the lignin.Under mild acid conditions,in addition to hemicelluloses,lower molecular weight lignin fractions were removed(~15%of the total lignin)in the HWE pre-treatment;also,the cleavage of the acid-labile lignin-carbohydrate bond took place to some extent.As a result,the HWE pretreatment promoted the subsequent delignification process and facilitated the lignin recovery from the spent liquor,in terms of higher delignification efficiency and higher purity of the lignin recovered from the spent liquor.The effects of the HWE pre-treatment prior to the delignification process were investigated in this study for both the oxygen-pressurized acetone-water(AWO)and the ALCELL processes,with focuses on the delignification efficiency and the properties of the lignin recovered from the process spent liquor.
