Using MgSO4 and NaOH solutions as starting materials, the whisker of 5Mg(OH)2·MgSO4·2H2O has been prepared by hydrothermal method at 160℃ for different time. The whisker was separated, washed by water, etha...Using MgSO4 and NaOH solutions as starting materials, the whisker of 5Mg(OH)2·MgSO4·2H2O has been prepared by hydrothermal method at 160℃ for different time. The whisker was separated, washed by water, ethanol and ether,and characterized by chemical analysis, XRD, IR and microphotography. The growth time of whisker would affect its morphology.展开更多
The isothermal solubility of Rb 2CO 3 C 2H 5OH H 2O ternary system at 40℃ has been determined.The result was used for purification of the Rb 2CO 3 commercial product.
Both whisker and nanometer MgSO4·5Mg(OH)2·3H2O(MOS) were prepared by hydrothermal method at 140℃for different times, using NaOH and MgSO4·7H2O as raw materials. The MgSO4·5Mg(OH)2·3H2O part i...Both whisker and nanometer MgSO4·5Mg(OH)2·3H2O(MOS) were prepared by hydrothermal method at 140℃for different times, using NaOH and MgSO4·7H2O as raw materials. The MgSO4·5Mg(OH)2·3H2O part icles were characterized by powder X ray diffraction(XRD),thermal analysis(TGA DSC), infrared spectroscopy(FT IR),transmission electron microscopy(SEM) and scanning electron microscopy(TEM). The size distribution in whisker like and nanocrystalline materials arein the range of 10～50μm and 10～20nm respectively. The whisker MOS is metastable phase in MgSO4 NaOH H2O system at 140℃,whereas nanometer MOS is stable phase.展开更多
Nanocrystalline MgSO\-4·5Mg（OH）\-2·3H\-2O were prepared by the hydrothermal reaction at 140 ℃ for 24 h. Nanoparticle samples were characterized by FTIR, TG, DSC, XRD and TEM. The size distribution of nano...Nanocrystalline MgSO\-4·5Mg（OH）\-2·3H\-2O were prepared by the hydrothermal reaction at 140 ℃ for 24 h. Nanoparticle samples were characterized by FTIR, TG, DSC, XRD and TEM. The size distribution of nanocrystalline is in the range of 10\20 nm, the mean size is 16 nm.展开更多
In this paper,hydrothermal phase reaction in MgSO4NaOHH2O quarternary reciprocal system at 160℃ has been studied.There appear four solid phases,corresponding to Mg(OH)2,5Mg(OH)2·MgSO4·2H2O,3...In this paper,hydrothermal phase reaction in MgSO4NaOHH2O quarternary reciprocal system at 160℃ has been studied.There appear four solid phases,corresponding to Mg(OH)2,5Mg(OH)2·MgSO4·2H2O,3Mg(OH)2·MgSO4·H2O and 2Mg(OH)2·MgSO4 respectively.The solid phases were determined by Chemical analysis,and characterized by both XRD and microphotograph.The MgSO4 concentration affects morphology of MOS(5Mg(OH)2·MgSO4·2H2O) whisker.展开更多
文摘Using MgSO4 and NaOH solutions as starting materials, the whisker of 5Mg(OH)2·MgSO4·2H2O has been prepared by hydrothermal method at 160℃ for different time. The whisker was separated, washed by water, ethanol and ether,and characterized by chemical analysis, XRD, IR and microphotography. The growth time of whisker would affect its morphology.
文摘The isothermal solubility of Rb 2CO 3 C 2H 5OH H 2O ternary system at 40℃ has been determined.The result was used for purification of the Rb 2CO 3 commercial product.
文摘Both whisker and nanometer MgSO4·5Mg(OH)2·3H2O(MOS) were prepared by hydrothermal method at 140℃for different times, using NaOH and MgSO4·7H2O as raw materials. The MgSO4·5Mg(OH)2·3H2O part icles were characterized by powder X ray diffraction(XRD),thermal analysis(TGA DSC), infrared spectroscopy(FT IR),transmission electron microscopy(SEM) and scanning electron microscopy(TEM). The size distribution in whisker like and nanocrystalline materials arein the range of 10～50μm and 10～20nm respectively. The whisker MOS is metastable phase in MgSO4 NaOH H2O system at 140℃,whereas nanometer MOS is stable phase.
文摘Nanocrystalline MgSO\-4·5Mg（OH）\-2·3H\-2O were prepared by the hydrothermal reaction at 140 ℃ for 24 h. Nanoparticle samples were characterized by FTIR, TG, DSC, XRD and TEM. The size distribution of nanocrystalline is in the range of 10\20 nm, the mean size is 16 nm.
文摘In this paper,hydrothermal phase reaction in MgSO4NaOHH2O quarternary reciprocal system at 160℃ has been studied.There appear four solid phases,corresponding to Mg(OH)2,5Mg(OH)2·MgSO4·2H2O,3Mg(OH)2·MgSO4·H2O and 2Mg(OH)2·MgSO4 respectively.The solid phases were determined by Chemical analysis,and characterized by both XRD and microphotograph.The MgSO4 concentration affects morphology of MOS(5Mg(OH)2·MgSO4·2H2O) whisker.
