Bonding of alkaline and alkaline earth cations in Na-Ca-Sr polyphosphate glasses. MORGUETTO, Gabriel Felipe; TSUNAKI, Lucas Bins Ely; SCHNEIDER, José Fabian.
Abstract: Dissolution of phosphates bioglasses, for bone regeneration or controlled ion release, is a key property to be tuned by adequate selection of chemical species. Mixed Na-Sr and Na-Ca polyphosphate glasses exhibit definite bonding preferences of the stronger cations to O from chain-end phosphates (Q1) instead of random bonding to the network (Q1 and Q2). This behavior is important for the control of dissolution, as hydration starts from the reaction of H with O in Q1. To analyze this bonding preference in glasses with two alkaline earths competing for O, mixed Na-Ca-Sr polyphosphates (0.57-x) Na2O·x/2 SrO·x/2 CaO·0.43 P2O5 (0 = x = 0.30 molar fraction) were considered. 31P nuclear magnetic resonance was used to analyze the short-range environments of Qn groups, detecting preferential bonding of Ca and Sr to Q1. To probe variations in the medium-range organization of the network induced by Ca or Sr, glasses with compositions (0.57-x) Na2O·x MO·0.43 P2O5 (M = Ca,Sr; 0 = x = 0.30 molar fraction), were analyzed using 31P-double-quantum techniques. An increase in mutual Q2 self-connectivity relative to the base Na-polyphosphate network was detected as Ca or Sr were added, indicating conversion of linear phosphate chains into rings.
International Journal of Applied Glass Science
v. 11, n. 1, p. 58-65 - Ano: 2020
Fator de Impacto: 1,845
@article={002981703,author = {MORGUETTO, Gabriel Felipe; TSUNAKI, Lucas Bins Ely; SCHNEIDER, José Fabian.},title={Bonding of alkaline and alkaline earth cations in Na-Ca-Sr polyphosphate glasses},journal={International Journal of Applied Glass Science},note={v. 11, n. 1, p. 58-65},year={2020}}
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Abstract: Dissolution of phosphates bioglasses, for bone regeneration or controlled ion release, is a key property to be tuned by adequate selection of chemical species. Mixed Na-Sr and Na-Ca polyphosphate glasses exhibit definite bonding preferences of the stronger cations to O from chain-end phosphates (Q1) instead of random bonding to the network (Q1 and Q2). This behavior is important for the control of dissolution, as hydration starts from the reaction of H with O in Q1. To analyze this bonding preference in glasses with two alkaline earths competing for O, mixed Na-Ca-Sr polyphosphates (0.57-x) Na2O·x/2 SrO·x/2 CaO·0.43 P2O5 (0 = x = 0.30 molar fraction) were considered. 31P nuclear magnetic resonance was used to analyze the short-range environments of Qn groups, detecting preferential bonding of Ca and Sr to Q1. To probe variations in the medium-range organization of the network induced by Ca or Sr, glasses with compositions (0.57-x) Na2O·x MO·0.43 P2O5 (M = Ca,Sr; 0 = x = 0.30 molar fraction), were analyzed using 31P-double-quantum techniques. An increase in mutual Q2 self-connectivity relative to the base Na-polyphosphate network was detected as Ca or Sr were added, indicating conversion of linear phosphate chains into rings.
@article={002981703,author = {MORGUETTO, Gabriel Felipe; TSUNAKI, Lucas Bins Ely; SCHNEIDER, José Fabian.},title={Bonding of alkaline and alkaline earth cations in Na-Ca-Sr polyphosphate glasses},journal={International Journal of Applied Glass Science},note={v. 11, n. 1, p. 58-65},year={2020}}