TY - JOUR
T1 - Structures and dissolution behaviors of CaO-P2O5-TiO2/Nb2O5 (Ca/P ≥ 1) invert glasses
AU - Lee, Sungho
AU - Maeda, Hirotaka
AU - Obata, Akiko
AU - Ueda, Kyosuke
AU - Narushima, Takayuki
AU - Kasuga, Toshihiro
N1 - Funding Information:
This work was supported in part by the Japan Society for the Promotion of Science KAKENHI Grant Numbers 25249094 , 26289238 , and 267992 .
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/7/2
Y1 - 2015/7/2
N2 - Abstract Common phosphate glasses - for example, those in the metaphosphate region - show potential as biodegradable materials. Some applications, such as biocompatible thin films coated on titanium or its alloys using radiofrequency magnetron sputtering methods, require films with good chemical durability. In the present work, CaO-P2O5-TiO2/Nb2O5 glasses with a Ca/P ratio of ≥ 1.00 were prepared using a melt-quenching method, and their structures and dissolution behaviors were investigated. When the Ca/P ratio was increased, the amount of orthophosphate (Qp0) group in the glasses increased, and that of pyrophosphate (Qp1) group decreased. The amount of Qp0 group was greater than the amount of Qp1 groups in glasses with a Ca/P ratio of ≥ 1.14. Intermediate oxides (i.e., TiO2 and Nb2O5) in the glasses cross-linked with the phosphate groups to form P-O-Ti/Nb bonds; these bonds were expected to take a tetrahedral form. The glasses prepared in the present work showed excellent chemical durability, because of the P-O-Ti/Nb bonds and the delocalized PO bonds that resulted from the increasing Qp0 content in the glasses.
AB - Abstract Common phosphate glasses - for example, those in the metaphosphate region - show potential as biodegradable materials. Some applications, such as biocompatible thin films coated on titanium or its alloys using radiofrequency magnetron sputtering methods, require films with good chemical durability. In the present work, CaO-P2O5-TiO2/Nb2O5 glasses with a Ca/P ratio of ≥ 1.00 were prepared using a melt-quenching method, and their structures and dissolution behaviors were investigated. When the Ca/P ratio was increased, the amount of orthophosphate (Qp0) group in the glasses increased, and that of pyrophosphate (Qp1) group decreased. The amount of Qp0 group was greater than the amount of Qp1 groups in glasses with a Ca/P ratio of ≥ 1.14. Intermediate oxides (i.e., TiO2 and Nb2O5) in the glasses cross-linked with the phosphate groups to form P-O-Ti/Nb bonds; these bonds were expected to take a tetrahedral form. The glasses prepared in the present work showed excellent chemical durability, because of the P-O-Ti/Nb bonds and the delocalized PO bonds that resulted from the increasing Qp0 content in the glasses.
KW - Biomaterial
KW - Calcium phosphate glass
KW - Dissolution
KW - Invert glass
KW - Structure
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U2 - 10.1016/j.jnoncrysol.2015.06.024
DO - 10.1016/j.jnoncrysol.2015.06.024
M3 - Article
AN - SCOPUS:84933525351
SN - 0022-3093
VL - 426
SP - 35
EP - 42
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
M1 - 17480
ER -