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
In order to study the influence of rubidium(Rb)addition on the phase composition,microstructure,mechanical properties and cell response of bioactive glass-ceramics,CaO−SiO2−Na2O−B2O3−MgO−ZnO−P2O5 glass system was desi...In order to study the influence of rubidium(Rb)addition on the phase composition,microstructure,mechanical properties and cell response of bioactive glass-ceramics,CaO−SiO2−Na2O−B2O3−MgO−ZnO−P2O5 glass system was designed with and without addition of Rb.The results show that hydroxyapatite(HA)and Mg−whitelockite(Ca18Mg2H2(PO4)14)crystalline phases are formed in the glass matrix without Rb.After the addition of Rb,only HA phase is detected.The grain size of the crystals in the glass-ceramics is larger with the addition of Rb than that of samples without Rb.Rb addition can improve the bending strength of glass-ceramics.The cultivation of human bone marrow mesenchymal stem cells(hBMSCs)on Rb-containing glass-ceramics demonstrates enhanced cell adhesion,proliferation and ALP activity.In conclusion,Rb-modified glass-ceramics exhibit good mechanical property,excellent bioactivity and biocompatibility,which have potential for bone regeneration application.展开更多
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。
基金The authors are grateful for the financial supports from the Natural Science Foundation of Hunan Province,China(2019JJ50797)the Postdoctoral Science Foundation of China(2019T120711).
文摘In order to study the influence of rubidium(Rb)addition on the phase composition,microstructure,mechanical properties and cell response of bioactive glass-ceramics,CaO−SiO2−Na2O−B2O3−MgO−ZnO−P2O5 glass system was designed with and without addition of Rb.The results show that hydroxyapatite(HA)and Mg−whitelockite(Ca18Mg2H2(PO4)14)crystalline phases are formed in the glass matrix without Rb.After the addition of Rb,only HA phase is detected.The grain size of the crystals in the glass-ceramics is larger with the addition of Rb than that of samples without Rb.Rb addition can improve the bending strength of glass-ceramics.The cultivation of human bone marrow mesenchymal stem cells(hBMSCs)on Rb-containing glass-ceramics demonstrates enhanced cell adhesion,proliferation and ALP activity.In conclusion,Rb-modified glass-ceramics exhibit good mechanical property,excellent bioactivity and biocompatibility,which have potential for bone regeneration application.
