DEVELOPMENT OF TEMPLATE-EXCHANGE METHOD FOR PROCESSING MESOPOROUS CERAMIC MATERIALS

This project was intended to develop the template ion change method for converting mesostructuredinorganic/organic composites into mesoporous materials as well as to synthesize new mesoporous ormosocomposite materials.1) Mesostructured rare-earth, gallium，aluminium-yittrium and galliumu-yittrium single or double oxides templated by dodecyl sulfateassemblies were synthesized by the homogeneous precipitation method. the oxides were converted bysulfate/acetate anion exchange into mesoporous hexagonal-structured materials with a specificsurface area ~ 300 m i D12 i D1g i D1-1 i D1. Further study of the optical and magnetic properties of therare earth based materials are in progress.2) For the aluminum oxide based dodecyl sulfatemesocomposite,the exchange of the template ions with long chain carboxylate ions or furfryl alcohol specie servedconsiderably improve the thermal stability of the mesostructured frameworkbut not leading to its conversion into a mesoporous material stable at temperatures up to 500℃。the basis of the measurement of pH and electric conductivity as a function of反应时间，the addition of protons in the polyoxyethylene/water system was clarified to promote the formationliquid crystalline phases This led to the successful preparation of homogeneous liquid crystallinephases containing silver ionsresulting in micro-or dendritic particles of silver.4) Preferred crystallization of octacalciumphosphate at ph7.0 was found to occur in the presence of DL-，D-and L-n-alkyl-α-amino acids C - i D2n - i D2H D22n+1 - i D2CH(NH D22 - i D2)COOH (n=0,2,3,4,6) accompanyingan increase in crystallinityinterlayer contraction or complexation with amino acid depending on their carbon number andenantiomeric or racemic stereospecificity. This may contribute to the development of new类型mesoporous apatitic materials。

This project was intended to develop the template ion exchange method for converting mesostructured inorganic/organic composites into mesoporous materials as well as to synthesize new mesoporous or mosocomposite materials.1) Mesostructured rare-earth, gallium, aluminium-yittrium and galliumu-yittrium single or double oxides templated by dodecyl sulfate assemblies were synthesized by the homogeneous precipitation method. The oxides were converted by sulfate/acetate anion exchange into mesoporous hexagonal-structured materials with a specific surface area 〜300 mィイD12ィエD1gィイD1-1ィエD1. Further study of the optical and magnetic properties of the rare earth based materials are in progress.2) For the aluminum oxide based dodecyl sulfate mesocomposite, the exchange of the template ions with long chain carboxylate ions or furfryl alcohol specie served to considerably improve the thermal stability of the mesostructured framework, but not leading to its conversion into a mesoporous material stable at temperatures up to 500℃.3) On the basis of the measurement of pH and electric conductivity as a function of reaction time, the addition of protons in the polyoxyethylene/water system was clarified to promote the formation liquid crystalline phases. This led to the successful preparation of homogeneous liquid crystalline phases containing silver ions, resulting in micro-or dendritic particles of silver.4) Preferred crystallization of octacalcium phosphate at pH7.0 was found to occur in the presence of DL-, D-and L-n-alkyl-α-amino acids CィイD2nィエD2HィイD22n+1ィエD2CH(NHィイD22ィエD2)COOH (n=0,2,3,4,6) accompanying an increase in crystallinity, interlayer contraction or complexation with amino acid depending on their carbon number and enantiomeric or racemic stereospecificity. This may contribute to the development of new types of mesoporous apatitic materials.