The system of SiO2-CaO-P2O5 bioactive glasses(BG) were successfully synthesized by microemulsion approach.X-ray diffraction(XRD),scanning electron micro scopy(SEM) and energy dispersive X-ray(EDX) analyses,transmissio...The system of SiO2-CaO-P2O5 bioactive glasses(BG) were successfully synthesized by microemulsion approach.X-ray diffraction(XRD),scanning electron micro scopy(SEM) and energy dispersive X-ray(EDX) analyses,transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FTIR),BET N2 gas adsorption analysis techniques were utilized in order to evaluate the phase composition,dimension,morphology,interconnectivity of pores and particle size of the synthesized BG respectiveely.The biocompatibility of BG was assessed by using dimethylthiazol diphenyl tetrazolium bromide(MTT).The BG scaffolds were implanted in rabbit mandibles and studied histologically.The results showed that the BG with a particle size less than 100 nm was prepared successfully.The measured BET specific surface area and pore volume was 113.9 m2/g and 0.28 cm3/g respectively.Cell cultures revealed that BG has been shown to have good biocompatibility and is also beneficial to the survival of Schwann cells,which can promote cell proliferation in vivo assay indicating that the BG can promote osteoconductivity.展开更多
The addition of silica to steelmaking slags to decrease the binary basicity can promote phosphate enrichment in quenched slag samples. In this study, we experimentally investigated phosphate enrichment behavior in CaO...The addition of silica to steelmaking slags to decrease the binary basicity can promote phosphate enrichment in quenched slag samples. In this study, we experimentally investigated phosphate enrichment behavior in CaO–SiO_2–FeO–Fe_2O_3–P_2O_5 slags with a P_2O_5 content of 5.00% and the binary basicity B ranging from 1.0 to 2.0, where the(%FetO)/(%Ca O) mass percentage ratio was maintained at 0.955. The experimental results are explained by the defined enrichment degree 2 3C S C PR- of solid solution 2CaO·SiO_2–3CaO·P_2O_5(C_2S–C_3P), where 2 3C S C PR- is a component of the developed ion and molecule coexistence theory(IMCT)–Ni model for calculating the mass action concentrations Ni of structural units in the slags on the basis of the IMCT. The asymmetrically inverse V-shaped relation between phosphate enrichment and binary basicity B was observed to be correlated in the slags under applied two-stage cooling conditions. The maximum content of P_2O_5 in the C_2S–C_3P solid solution reached approximately 30.0% when the binary basicity B was controlled at 1.3.展开更多
稀土元素是一种重要的不可再生资源,目前全球对稀土的需求依然在迅速增加。日本学者Kato等(2011)通过对太平洋沉积物大规模的采样发现,太平洋洋底含有大量的富稀土沉积物分布,并可能成为多金属结核、富钴结壳及多金属硫化物以外的又一...稀土元素是一种重要的不可再生资源,目前全球对稀土的需求依然在迅速增加。日本学者Kato等(2011)通过对太平洋沉积物大规模的采样发现,太平洋洋底含有大量的富稀土沉积物分布,并可能成为多金属结核、富钴结壳及多金属硫化物以外的又一大潜在的矿产资源。当前普遍认为深海沉积物中稀土元素的主要载体为生物磷酸盐(Yasukawa et al.,2014;Zhang et al.,2017),沉积物中的钙质和磷质组分均与稀土元素关系密切(邱忠荣等,2019)。本文对洋底沉积物中CaO/P2O5与REY关系进行系统性分析,为深海沉积物中CaO/P2O5可能作为指示REY含量的潜在指标提供一定的科学依据。展开更多
基金Funded by Guangdong Science and Technology Tackling Project(No.2010B031100002)the Orientation of Lu'an Commissioned the West Anhui University Municipal Research Project(No.2011LW009)
文摘The system of SiO2-CaO-P2O5 bioactive glasses(BG) were successfully synthesized by microemulsion approach.X-ray diffraction(XRD),scanning electron micro scopy(SEM) and energy dispersive X-ray(EDX) analyses,transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FTIR),BET N2 gas adsorption analysis techniques were utilized in order to evaluate the phase composition,dimension,morphology,interconnectivity of pores and particle size of the synthesized BG respectiveely.The biocompatibility of BG was assessed by using dimethylthiazol diphenyl tetrazolium bromide(MTT).The BG scaffolds were implanted in rabbit mandibles and studied histologically.The results showed that the BG with a particle size less than 100 nm was prepared successfully.The measured BET specific surface area and pore volume was 113.9 m2/g and 0.28 cm3/g respectively.Cell cultures revealed that BG has been shown to have good biocompatibility and is also beneficial to the survival of Schwann cells,which can promote cell proliferation in vivo assay indicating that the BG can promote osteoconductivity.
基金financially supported by the National Basic Research Program of China (No. 2014CB643401)the National Natural Science Foundation of China (Nos. 51372019, 51174186, and 51072022)
文摘The addition of silica to steelmaking slags to decrease the binary basicity can promote phosphate enrichment in quenched slag samples. In this study, we experimentally investigated phosphate enrichment behavior in CaO–SiO_2–FeO–Fe_2O_3–P_2O_5 slags with a P_2O_5 content of 5.00% and the binary basicity B ranging from 1.0 to 2.0, where the(%FetO)/(%Ca O) mass percentage ratio was maintained at 0.955. The experimental results are explained by the defined enrichment degree 2 3C S C PR- of solid solution 2CaO·SiO_2–3CaO·P_2O_5(C_2S–C_3P), where 2 3C S C PR- is a component of the developed ion and molecule coexistence theory(IMCT)–Ni model for calculating the mass action concentrations Ni of structural units in the slags on the basis of the IMCT. The asymmetrically inverse V-shaped relation between phosphate enrichment and binary basicity B was observed to be correlated in the slags under applied two-stage cooling conditions. The maximum content of P_2O_5 in the C_2S–C_3P solid solution reached approximately 30.0% when the binary basicity B was controlled at 1.3.
文摘稀土元素是一种重要的不可再生资源,目前全球对稀土的需求依然在迅速增加。日本学者Kato等(2011)通过对太平洋沉积物大规模的采样发现,太平洋洋底含有大量的富稀土沉积物分布,并可能成为多金属结核、富钴结壳及多金属硫化物以外的又一大潜在的矿产资源。当前普遍认为深海沉积物中稀土元素的主要载体为生物磷酸盐(Yasukawa et al.,2014;Zhang et al.,2017),沉积物中的钙质和磷质组分均与稀土元素关系密切(邱忠荣等,2019)。本文对洋底沉积物中CaO/P2O5与REY关系进行系统性分析,为深海沉积物中CaO/P2O5可能作为指示REY含量的潜在指标提供一定的科学依据。
