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by a solvent evaporation method. The degradation characteristics of the poly(d,1-lactide)composite films were studied in vitro and in vivo. The acidity produced by poly(d,1-lactide)materials was not obvious.Adding chitosan andβ-TCP can relieve the acidity problem and improve strength performance of films.The NGF has influences on the degradation characteristics of films.It is verified that PDLLA/CHI/β......
H2SO4,calcining in air at 700~800℃ for 3h.This catalystpossesses both strong Bronsted acidity and strong Lewis acidity experimentally showed by IR observation ofpyridine absorbed on it.XPS and AES......
measurements.The results showed that,among the catalysts investigated,the phosphated Ce0.75Zr0.25O2catalyst showed the highest hydrothermal stability.The remained high acidity of the phosphated catalyst... the acidity of catalyst was still high.The decomposition of sulfates at temperatures higher than 600°C restrained the usage of sulfated catalysts in high temperature conditions.The overall dehydration......
measurements.The results showed that,among the catalysts investigated,the phosphated Ce0.75Zr0.25O2catalyst showed the highest hydrothermal stability.The remained high acidity of the phosphated catalyst... the acidity of catalyst was still high.The decomposition of sulfates at temperatures higher than 600°C restrained the usage of sulfated catalysts in high temperature conditions.The overall dehydration......
Cyanex 272 and P507. In this paper, HYY-2 was synthesized in our lab, and the extraction equilibrium, thermodynamics and stripping acidity for La, Gd and Y, which stood for light rare earth elements(REE), middle REE and heavy REE respectively, from nitrate media with this extractant were investigated. Meanwhile, extraction ability, capacity and stripping acidity of HYY-2 were investigated......
Cyanex 272 and P507. In this paper, HYY-2 was synthesized in our lab, and the extraction equilibrium, thermodynamics and stripping acidity for La, Gd and Y, which stood for light rare earth elements(REE), middle REE and heavy REE respectively, from nitrate media with this extractant were investigated. Meanwhile, extraction ability, capacity and stripping acidity of HYY-2 were investigated......
was lower in D2EHPA-HCl system. Pointing to this problem,the effect of the acidity of feed and the concentration of lactic acid on the distribution ratio,separation coefficient and extraction capacity... increased with decreasing of feed acidity and increasing of the lactic acid concentration,and the extraction capacity increased with increasing of lactic acid concentration in D2EHPA-HCl-LA system. When......
was lower in D2EHPA-HCl system. Pointing to this problem,the effect of the acidity of feed and the concentration of lactic acid on the distribution ratio,separation coefficient and extraction capacity... increased with decreasing of feed acidity and increasing of the lactic acid concentration,and the extraction capacity increased with increasing of lactic acid concentration in D2EHPA-HCl-LA system. When......
; The extraction equilibrium mathematic models for gadolinium,terbium and dysprosium in HCl-1.5mol/L HEH(EHP)system covering a relatively wide range of lanthanide concentration and acidity,havebeen developed.There...,the Gd,Tb and Dy concentrations in both aqueous and organic phase in eaeh stage as well asthe aqueous acidity may be calculated.Product purities,distribution ratio and extraction factors may also......
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