1
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Takada K, Tamura T, Kasuga T. Structure and dissolution of silicophosphate glass. RSC Adv 2022; 12:34882-34889. [DOI: 10.1039/d2ra06707b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 11/28/2022] [Indexed: 12/12/2022] Open
Abstract
The solubility of P2O5–SiO2–Na2O–CaO glasses was suppressed by the coexistence of CaO and Na2O, attributed to the delocalization of the electron distribution of P in QP3 units coordinated to the six-fold-coordinated Si.
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Affiliation(s)
- Kazuya Takada
- Division of Advanced Ceramics, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Tomoyuki Tamura
- Division of Applied Physics, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Toshihiro Kasuga
- Division of Advanced Ceramics, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
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2
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Lodesani F, Menziani MC, Hijiya H, Takato Y, Urata S, Pedone A. Structural origins of the Mixed Alkali Effect in Alkali Aluminosilicate Glasses: Molecular Dynamics Study and its Assessment. Sci Rep 2020; 10:2906. [PMID: 32076082 PMCID: PMC7031271 DOI: 10.1038/s41598-020-59875-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 02/04/2020] [Indexed: 12/03/2022] Open
Abstract
The comprehension of the nonlinear effects provided by mixed alkali effect (MAE) in oxide glasses is useful to optimize glass compositions to achieve specific properties that depend on the mobility of ions, such as the chemical durability, glass transition temperature, viscosity and ionic conductivity. Although molecular dynamics (MD) simulations have already been applied to investigate the MAE on silicates, less effort has been devoted to study such phenomenon in mixed alkali aluminosilicate glasses where alkali cations can act both as modifiers, forming non-bridging oxygens and percolation channels, and as charge compensator of the AlO4- units present in the network. Moreover, the ionic conductivity has not been computed yet; thus, the accuracy of the atomistic simulations in reproducing the MAE on the property is still open to question. In this work, we have validated five major interatomic potentials for the classical MD simulations by modelling the structure, density, glass transition temperature and ionic conductivity for three aluminosilicate glasses, (25 - x)Na2O - x(K2O) - 10(Al2O3) - 65(SiO2) (x = 0, 12.5, 25). It was observed that only the core-shell (CS) polarizable force field well reproduces the experimentally measured MAE on Tg and the ionic conductivity as well as the higher conductivity of single sodium aluminosilicate glass at low temperature and the higher conductivity of single potassium aluminosilicate glass at high temperature. The MAE is related to the suppression of jump events of the alkaline ions between dissimilar sites in the percolation channels consisting of both sodium and potassium ions as in the case of alkaline silicates. The superior reproducibility of the CS potential is originated from the larger and the flexible ring structures due to the smaller Si-O-Si inter-tetrahedra angle, creating appropriate percolation channels for ion conductivity. We also report detailed assessments for using the potential models including the CS potential for investigating MAE on aluminosilicates.
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Affiliation(s)
- Federica Lodesani
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italia
| | - Maria Cristina Menziani
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italia
| | - Hiroyuki Hijiya
- Materials Integration Laboratories, AGC Inc., Yokohama, Kanagawa, 221-8755, Japan
| | - Yoichi Takato
- Innovative Technology Laboratories, AGC Inc., Yokohama, Kanagawa, 221-8755, Japan
| | - Shingo Urata
- Innovative Technology Laboratories, AGC Inc., Yokohama, Kanagawa, 221-8755, Japan
| | - Alfonso Pedone
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italia.
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3
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Combined sodium and fluorine promote diopside continuous growth to achieve one-step crystallization in CaO-Al2O3-SiO2-Fe2O3 glass-ceramics. Ann Ital Chir 2019. [DOI: 10.1016/j.jeurceramsoc.2019.07.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Guo H, Li J, Zhang H, Li T, Luo J, Yu X, Wu S, Zong C. First-principles molecular dynamics investigation on KF-NaF-AlF3 molten salt system. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.06.060] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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5
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Li J, Guo H, Zhang H, Li T, Gong Y. First-principles molecular dynamics simulation of the ionic structure and electronic properties of Na3AlF6 molten salt. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.01.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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6
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Lv X, Han Z, Zhang H, Liu Q, Chen J, Jiang L. Ionic structure and transport properties of KF–NaF–AlF3 fused salt: a molecular dynamics study. Phys Chem Chem Phys 2019; 21:7474-7482. [DOI: 10.1039/c9cp00377k] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Studying the ionic structure and transport properties of the KF–NaF–AlF3 fused salt at the atomic level.
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Affiliation(s)
- Xiaojun Lv
- School of Metallurgy and Environment, Central South University
- Changsha
- China
| | - Zexun Han
- School of Metallurgy and Environment, Central South University
- Changsha
- China
| | - Hengxing Zhang
- School of Metallurgy and Environment, Central South University
- Changsha
- China
| | - Qingsheng Liu
- Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology
- Ganzhou 341000
- China
| | - Jiangan Chen
- Faculty of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology
- Ganzhou 341000
- China
| | - Liangxing Jiang
- School of Metallurgy and Environment, Central South University
- Changsha
- China
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7
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Lv X, Han Z, Chen J, Jiang L, Xu Z, Liu Q. First-principles molecular dynamics study of ionic structure and transport properties of LiF-NaF-AlF3 molten salt. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.06.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Allu AR, Gaddam A, Ganisetti S, Balaji S, Siegel R, Mather GC, Fabian M, Pascual MJ, Ditaranto N, Milius W, Senker J, Agarkov DA, Kharton VV, Ferreira JMF. Structure and Crystallization of Alkaline-Earth Aluminosilicate Glasses: Prevention of the Alumina-Avoidance Principle. J Phys Chem B 2018; 122:4737-4747. [PMID: 29630838 DOI: 10.1021/acs.jpcb.8b01811] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Aluminosilicate glasses are considered to follow the Al-avoidance principle, which states that Al-O-Al linkages are energetically less favorable, such that, if there is a possibility for Si-O-Al linkages to occur in a glass composition, Al-O-Al linkages are not formed. The current paper shows that breaching of the Al-avoidance principle is essential for understanding the distribution of network-forming AlO4 and SiO4 structural units in alkaline-earth aluminosilicate glasses. The present study proposes a new modified random network (NMRN) model, which accepts Al-O-Al linkages for aluminosilicate glasses. The NMRN model consists of two regions, a network structure region (NS-Region) composed of well-separated homonuclear and heteronuclear framework species and a channel region (C-Region) of nonbridging oxygens (NBOs) and nonframework cations. The NMRN model accounts for the structural changes and devitrification behavior of aluminosilicate glasses. A parent Ca- and Al-rich melilite-based CaO-MgO-Al2O3-SiO2 (CMAS) glass composition was modified by substituting MgO for CaO and SiO2 for Al2O3 to understand variations in the distribution of network-forming structural units in the NS-region and devitrification behavior upon heat treating. The structural features of the glass and glass-ceramics (GCs) were meticulously assessed by advanced characterization techniques including neutron diffraction (ND), powder X-ray diffraction (XRD), 29Si and 27Al magic angle spinning (MAS)-nuclear magnetic resonance (NMR), and in situ Raman spectroscopy. ND revealed the formation of SiO4 and AlO4 tetrahedral units in all the glass compositions. Simulations of chemical glass compositions based on deconvolution of 29Si MAS NMR spectral analysis indicate the preferred formation of Si-O-Al over Si-O-Si and Al-O-Al linkages and the presence of a high concentration of nonbridging oxygens leading to the formation of a separate NS-region containing both SiO4 and AlO4 tetrahedra (Si/Al) (heteronuclear) in addition to the presence of Al[4]-O-Al[4] bonds; this region coexists with a predominantly SiO4-containing (homonuclear) NS-region. In GCs, obtained after heat treatment at 850 °C for 250 h, the formation of crystalline phases, as revealed from Rietveld refinement of XRD data, may be understood on the basis of the distribution of SiO4 and AlO4 structural units in the NS-region. The in situ Raman spectra of the GCs confirmed the formation of a Si/Al structural region, as well as indicating interaction between the Al/Si region and SiO4-rich region at higher temperatures, leading to the formation of additional crystalline phases.
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Affiliation(s)
- Amarnath R Allu
- Glass Division , CSIR-Central Glass and Ceramic Research Institute , 700032 Kolkata , India
| | - Anuraag Gaddam
- Department of Materials and Ceramic Engineering, CICECO , University of Aveiro , 3810-193 Aveiro , Portugal
| | - Sudheer Ganisetti
- Department of Materials Science and Engineering, Institute I , Friedrich-Alexander-Universität Erlangen-Nürnberg , Martensstr. 5 , 91058 Erlangen , Germany
| | - Sathravada Balaji
- Glass Division , CSIR-Central Glass and Ceramic Research Institute , 700032 Kolkata , India
| | - Renée Siegel
- Inorganic Chemistry III , University of Bayreuth , 95440 Bayreuth , Germany
| | - Glenn C Mather
- Instituto de Cerámica y Vidrio (CSIC) , C/Kelsen 5, Campus de Cantoblanco, 28049 Madrid , Spain
| | - Margit Fabian
- Centre for Energy Research , Hungary Academy of Sciences Centre for Energy Research , 1121 Budapest Konkoly-Thege street , 29-33 , Budapest , Hungary
| | - Maria J Pascual
- Instituto de Cerámica y Vidrio (CSIC) , C/Kelsen 5, Campus de Cantoblanco, 28049 Madrid , Spain
| | - Nicoletta Ditaranto
- Dipartimento di Chimica and Laboratorio di Diagnostica Applicata ai Beni Culturali , Università degli Studi di Bari "Aldo Moro" , via Orabona 4 , 70125 Bari , Italy
| | - Wolfgang Milius
- Inorganic Chemistry I , University of Bayreuth , 95440 Bayreuth , Germany
| | - Jürgen Senker
- Inorganic Chemistry III , University of Bayreuth , 95440 Bayreuth , Germany
| | - Dmitrii A Agarkov
- Institute of Solid State Physics RAS , 142432 Chernogolovka, Moscow District , Russia.,Moscow Institute of Physics and Technology , Institutsky lane 9, Dolgoprudny 141700 , Moscow District , Russia
| | - Vladislav V Kharton
- Institute of Solid State Physics RAS , 142432 Chernogolovka, Moscow District , Russia
| | - José M F Ferreira
- Department of Materials and Ceramic Engineering, CICECO , University of Aveiro , 3810-193 Aveiro , Portugal
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9
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Pedone A, Chen X, Hill RG, Karpukhina N. Molecular Dynamics Investigation of Halide-Containing Phospho-Silicate Bioactive Glasses. J Phys Chem B 2018; 122:2940-2948. [DOI: 10.1021/acs.jpcb.8b00547] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alfonso Pedone
- Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy
| | - Xiaojing Chen
- Xiangya Stomatological Hospital & School of Stomatology, Central South University, Changsha, Hunan 410078, P.R. China
- Dental Physical Sciences, Institute of Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom
| | - Robert G. Hill
- Dental Physical Sciences, Institute of Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom
| | - Natalia Karpukhina
- Dental Physical Sciences, Institute of Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom
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10
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Sanchez-Salcedo S, Malavasi G, Salinas AJ, Lusvardi G, Rigamonti L, Menabue L, Vallet-Regi M. Highly-Bioreactive Silica-Based Mesoporous Bioactive Glasses Enriched with Gallium(III). MATERIALS (BASEL, SWITZERLAND) 2018; 11:E367. [PMID: 29498654 PMCID: PMC5872946 DOI: 10.3390/ma11030367] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 02/26/2018] [Accepted: 02/27/2018] [Indexed: 11/17/2022]
Abstract
Beneficial effects in bone cell growth and antibacterial action are currently attributed to Ga3+ ions. Thus, they can be used to upgrade mesoporous bioactive glasses (MBGs), investigated for tissue engineering, whenever they released therapeutic amounts of gallium ions to the surrounding medium. Three gallium-enriched MBGs with composition (in mol %) xSiO₂-yCaO-zP₂O₅-5Ga₂O₃, being x = 70, y = 15, z = 10 for Ga_1; x = 80, y = 12, z = 3 for Ga_2; and x = 80, y = 15, z = 0 for Ga_3, were investigated and compared with the gallium-free 80SiO₂-15CaO-5P₂O₅ MBG (B). 29Si and 31P MAS NMR analyses indicated that Ga3+ acts as network modifier in the glass regions with higher polymerization degree and as network former in the zones with high concentration of classical modifiers (Ca2+ ions). Ga_1 and Ga_2 exhibited a quick in vitro bioactive response because they were coated by an apatite-like layer after 1 and 3 days in simulated body fluid. Although we have not conducted biological tests in this paper (cells or bacteria), Ga_1 released high but non-cytotoxic amounts of Ga3+ ions in Todd Hewitt Broth culture medium that were 140 times higher than the IC90 of Pseudomonas aeruginosa bacteria, demonstrating its potential for tissue engineering applications.
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Affiliation(s)
- Sandra Sanchez-Salcedo
- Dpto. Química en Ciencias Farmacéuticas, Instituto de Investigación Sanitaria Hospital 12 de Octubre, Universidad Complutense de Madrid, 28040 Madrid, Spain.
- Centro Investigación Biomédica en Red Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28040 Madrid, Spain.
| | - Gianluca Malavasi
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy.
| | - Antonio J Salinas
- Dpto. Química en Ciencias Farmacéuticas, Instituto de Investigación Sanitaria Hospital 12 de Octubre, Universidad Complutense de Madrid, 28040 Madrid, Spain.
- Centro Investigación Biomédica en Red Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28040 Madrid, Spain.
| | - Gigliola Lusvardi
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy.
| | - Luca Rigamonti
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy.
| | - Ledi Menabue
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy.
| | - Maria Vallet-Regi
- Dpto. Química en Ciencias Farmacéuticas, Instituto de Investigación Sanitaria Hospital 12 de Octubre, Universidad Complutense de Madrid, 28040 Madrid, Spain.
- Centro Investigación Biomédica en Red Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28040 Madrid, Spain.
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11
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Deng L, Du J. Effects of system size and cooling rate on the structure and properties of sodium borosilicate glasses from molecular dynamics simulations. J Chem Phys 2018; 148:024504. [DOI: 10.1063/1.5007083] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Lu Deng
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, USA
| | - Jincheng Du
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, USA
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12
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Allu AR, Balaji S, Tulyaganov DU, Mather GC, Margit F, Pascual MJ, Siegel R, Milius W, Senker J, Agarkov DA, Kharton VV, Ferreira JMF. Understanding the Formation of CaAl 2Si 2O 8 in Melilite-Based Glass-Ceramics: Combined Diffraction and Spectroscopic Studies. ACS OMEGA 2017; 2:6233-6243. [PMID: 31457868 PMCID: PMC6644492 DOI: 10.1021/acsomega.7b00598] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 07/26/2017] [Indexed: 06/10/2023]
Abstract
An assessment is undertaken for the formation of anorthite crystalline phase in a melilite-based glass composition (CMAS: 38.7CaO-9.7MgO-12.9Al2O3-38.7SiO2 mol %), used as a sealing material in solid oxide fuel cells, in view of the detrimental effect of anorthite on the sealing properties. Several advanced characterization techniques are employed to assess the material after prolonged heat treatment, including neutron powder diffraction (ND), X-ray powder diffraction (XRD), 29Si and 27Al magic-angle spinning nuclear magnetic resonance (MAS-NMR), and in situ Raman spectroscopy. ND, 29Si MAS-NMR, and 27Al MAS-NMR results revealed that both Si and Al adopt tetrahedral coordination and participate in the formation of the network structure. In situ XRD measurements for the CMAS glass demonstrate the thermal stability of the glass structure up to 850 °C. Further heat treatment up to 900 °C initiates the precipitation of melilite, a solid solution of akermanite/gehlenite crystalline phase. Qualitative XRD data for glass-ceramics (GCs) produced after heat treatment at 850 °C for 500 h revealed the presence of anorthite along with the melilite crystalline phase. Rietveld refinement of XRD data indicated a high fraction of glassy phase (∼67%) after the formation of crystalline phases. The 29Si MAS-NMR spectra for the CMAS-GC suggest the presence of structural units in the remaining glassy phase with a polymerization degree higher than dimer units, whereas the 27Al MAS-NMR spectra revealed that most Al3+ cations exhibit a 4-fold coordination. In situ Raman spectroscopy data indicate that the formation of anorthite crystalline phase initiated after 240 h of heat treatment at 850 °C owing to the interaction between the gehlenite crystals and the remaining glassy phase.
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Affiliation(s)
- Amarnath R. Allu
- Glass
Science and Technology Section, CSIR—Central
Glass and Ceramic Research Institute, 700032 Kolkata, India
- Department
of Materials and Ceramics Engineering, CICECO,
University of Aveiro, 3810-193 Aveiro, Portugal
| | - Sathravada Balaji
- Glass
Science and Technology Section, CSIR—Central
Glass and Ceramic Research Institute, 700032 Kolkata, India
| | - Dilshat U. Tulyaganov
- Department
of Materials and Ceramics Engineering, CICECO,
University of Aveiro, 3810-193 Aveiro, Portugal
- Turin
Polytechnic University in Tashkent, 17, Small Ring, 100095 Tashkent, Uzbekistan
| | - Glenn C. Mather
- Instituto
de Cerámica y Vidrio (CSIC), C/Kelsen 5, Campus de Cantoblanco, 28049 Madrid, Spain
| | - Fabian Margit
- Centre
for Energy Research, Konkoly-Thege Street 29-33, 1121 Budapest, Hungary
| | - María J. Pascual
- Instituto
de Cerámica y Vidrio (CSIC), C/Kelsen 5, Campus de Cantoblanco, 28049 Madrid, Spain
| | - Renée Siegel
- Inorganic Chemistry
III and Inorganic Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany
| | - Wolfgang Milius
- Inorganic Chemistry
III and Inorganic Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany
| | - Jürgen Senker
- Inorganic Chemistry
III and Inorganic Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany
| | - Dmitrii A. Agarkov
- Institute
of Solid State Physics RAS, 142432 Chernogolovka, Moscow District, Russia
| | - Vladislav V. Kharton
- Institute
of Solid State Physics RAS, 142432 Chernogolovka, Moscow District, Russia
| | - José M. F. Ferreira
- Department
of Materials and Ceramics Engineering, CICECO,
University of Aveiro, 3810-193 Aveiro, Portugal
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13
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Swansbury LA, Mountjoy G, Chen X, Karpukhina N, Hill R. Modeling the Onset of Phase Separation in CaO-SiO 2-CaCl 2 Chlorine-Containing Silicate Glasses. J Phys Chem B 2017; 121:5647-5653. [PMID: 28498659 DOI: 10.1021/acs.jpcb.7b02986] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The addition of chlorine into a bioactive glass composition is expected to reduce its abrasiveness and increase its bioactivity, which is important for dental applications such as toothpastes. There is a lack of information and understanding regarding the structural role of chlorine in chlorine-containing bioactive silicate glasses. This has prompted classical core-shell model molecular dynamics simulations of (50 - x/2)CaO-(50 - x/2)SiO2-xCaCl2 glasses to be performed, where x ranges from x = 0.0 to 43.1 mol % CaCl2. These ternary glasses are advantageous for a fundamental study because they do not have additional network formers (e.g., phosphorus pentoxide) or modifiers (e.g., sodium) typically found in bioactive glass compositions. The (50 - x/2)CaO-(50 - x/2)SiO2-xCaCl2 glasses were seen to become phase-separated around the x = 16.1 mol % CaCl2 composition, and chlorine predominantly coordinated with calcium. These findings provide a solid foundation for further computational modeling work on more complex chlorine-containing bioactive glass compositions.
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Affiliation(s)
- Laura A Swansbury
- School of Physical Sciences, University of Kent , Canterbury, Kent CT2 7NH, United Kingdom
| | - Gavin Mountjoy
- School of Physical Sciences, University of Kent , Canterbury, Kent CT2 7NH, United Kingdom
| | - Xiaojing Chen
- Dental Physical Sciences, Institute of Dentistry, Queen Mary University of London , Mile End Road, London E1 4NS, United Kingdom
| | - Natalia Karpukhina
- Dental Physical Sciences, Institute of Dentistry, Queen Mary University of London , Mile End Road, London E1 4NS, United Kingdom
| | - Robert Hill
- Dental Physical Sciences, Institute of Dentistry, Queen Mary University of London , Mile End Road, London E1 4NS, United Kingdom
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14
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Maeda H, Tamura T, Kasuga T. Experimental and Theoretical Investigation of the Structural Role of Titanium Oxide in CaO-P 2O 5-TiO 2 Invert Glass. J Phys Chem B 2017; 121:5433-5438. [PMID: 28488867 DOI: 10.1021/acs.jpcb.7b02350] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Understanding the structural role of TiO2 in calcium phosphate invert glasses is key for developing a new glass design for biomedical applications. Experimental and computational analysis methods were used to investigate the impact of TiO2 substitution in these glasses. Spectroscopic analyses indicated that titanium oxide exists as both TiO4 and TiO6 units, leading to the formation of Ti-O-P bonds, in spite of depolymerization of the phosphate chains. Classical molecular dynamics showed that the presence of TiO2 influences the phosphate units and CaO polyhedral structures. The formation of the Ti-O-P bonds caused an increase in the network connectivity of the invert glasses, leading to the improvement of the glass forming ability and wettability. The addition of TiO2 to calcium phosphate invert glasses led to the introduction of bioactivity.
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Affiliation(s)
- Hirotaka Maeda
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho , Showa-ku, Nagoya 466-8555, Japan
| | - Tomoyuki Tamura
- Department of Physical Science and Engineering, Nagoya Institute of Technology, Gokiso-cho , Showa-ku, Nagoya 466-8555, Japan.,Center for Materials research by Information Integration, National Institute for Materials Science , Tsukuba 305-0047, Japan
| | - Toshihiro Kasuga
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho , Showa-ku, Nagoya 466-8555, Japan
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15
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Côté AS, Cormack AN, Tilocca A. Influence of Calcium on the Initial Stages of the Sol-Gel Synthesis of Bioactive Glasses. J Phys Chem B 2016; 120:11773-11780. [PMID: 27809532 DOI: 10.1021/acs.jpcb.6b09881] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding how calcium interacts with silica sources and influences their polycondensation in aqueous solutions is of central importance for the development of more effective biomaterials by sol-gel approaches. For this purpose, the atomic-scale evolutions of a calcium-containing precursor solution corresponding to a typical sol-gel bioactive glass and of a corresponding Ca-free solution were compared using reactive molecular dynamics simulations. The simulations highlight a significantly faster rate of condensation when calcium is present in the initial solution, resulting in the formation of large and ramified silica clusters within 5 ns, which are absent in the Ca-free system. This different behavior has been analyzed and interpreted in terms of the Ca-induced nanosegregation in calcium-rich and silica-rich regions, which promotes the condensation reactions within the latter. By identifying a possible mechanism behind the limited incorporation of calcium in the silica nanoclusters formed in the early stages of the sol-gel process, these results could guide further studies aimed at identifying favorable experimental conditions to enhance initial calcium incorporation and thus produce sol-gel biomaterials with improved properties.
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Affiliation(s)
- Alexander S Côté
- Department of Chemistry, University College London , London WC1H 0AJ, United Kingdom
| | - Alastair N Cormack
- New York State College of Ceramics, Alfred University , Alfred, New York 14802, United States
| | - Antonio Tilocca
- Department of Chemistry, University College London , London WC1H 0AJ, United Kingdom
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16
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Lv X, Xu Z, Li J, Chen J, Liu Q. Molecular dynamics investigation on structural and transport properties of Na3AlF6–Al2O3 molten salt. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.05.064] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Lv X, Xu Z, Li J, Chen J, Liu Q. Theoretical investigation on local structure and transport properties of NaFAlF3 molten salts under electric field environment. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.03.076] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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18
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Lv X, Xu Z, Li J, Chen J, Liu Q. First-principles molecular dynamics investigation on Na3AlF6 molten salt. J Fluor Chem 2016. [DOI: 10.1016/j.jfluchem.2016.03.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Shuai C, Zhou J, Wu P, Gao C, Feng P, Xiao T, Deng Y, Peng S. Enhanced Stability of Calcium Sulfate Scaffolds with 45S5 Bioglass for Bone Repair. MATERIALS (BASEL, SWITZERLAND) 2015; 8:7498-7510. [PMID: 28793652 PMCID: PMC5458930 DOI: 10.3390/ma8115398] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 10/29/2015] [Accepted: 11/02/2015] [Indexed: 11/17/2022]
Abstract
Calcium sulfate (CaSO₄), as a promising tissue repair material, has been applied widely due to its outstanding bioabsorbability and osteoconduction. However, fast disintegration, insufficient mechanical strength and poor bioactivity have limited its further application. In the study, CaSO₄ scaffolds fabricated by using selective laser sintering were improved by adding 45S5 bioglass. The 45S5 bioglass enhanced stability significantly due to the bond effect of glassy phase between the CaSO₄ grains. After immersing for four days in simulated body fluid (SBF), the specimens with 45S5 bioglass could still retain its original shape compared as opposed to specimens without 45S5 bioglass who experienced disintegration. Meanwhile, its compressive strength and fracture toughness increased by 80% and 37%, respectively. Furthermore, the apatite layer was formed on the CaSO₄ scaffolds with 45S5 bioglass in SBF, indicating good bioactivity of the scaffolds. In addition, the scaffolds showed good ability to support the osteoblast-like cell adhesion and proliferation.
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Affiliation(s)
- Cijun Shuai
- State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China.
| | - Jianhua Zhou
- State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China.
| | - Ping Wu
- College of Chemistry, Xiangtan University, Xiangtan 411105, China.
| | - Chengde Gao
- State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China.
| | - Pei Feng
- State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China.
| | - Tao Xiao
- Department of Orthopedics, the Second Xiangya Hospital, Central South University, Changsha 410011, China.
| | - Youwen Deng
- Department of Orthopedics, the Second Xiangya Hospital, Central South University, Changsha 410011, China.
| | - Shuping Peng
- School of Basic Medical Science, Central South University, Changsha 410078, China.
- Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya School of Medicine, Central South University, Changsha 410013, China.
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20
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Mathew R, Stevensson B, Edén M. Na/Ca Intermixing around Silicate and Phosphate Groups in Bioactive Phosphosilicate Glasses Revealed by Heteronuclear Solid-State NMR and Molecular Dynamics Simulations. J Phys Chem B 2015; 119:5701-15. [PMID: 25815412 DOI: 10.1021/acs.jpcb.5b01130] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We characterize the intermixing of network-modifying Na(+)/Ca(2+) ions around the silicate (QSi(n)) and phosphate (QP(n)) tetrahedra in a series of 16 Na2O–CaO–SiO2–P2O5 glasses, whose P content and silicate network connectivity were varied independently. The set includes both bioactive and bioinactive compositions and also encompasses two soda-lime-silicate members devoid of P, as well as two CaO–SiO2 glasses and one Na2O–SiO2–P2O5 glass. The various Si/P↔Na/Ca contacts were probed by molecular dynamics (MD) simulations together with heteronuclear magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) experimentation utilizing (23)Na{(31)P} and (23)Na{(29)Si} REDOR, as well as (31)P{ (23)Na} and (29)Si{(23)Na} REAPDOR. We introduce an approach for quantifying the extent of Na(+)/Ca(2+) ordering around a given QP(n) or QSi(n) group, encoded by the preference factor 0⩽ PM ⩽ 1 conveying the relative weights of a random cation intermixing (PM = 0) and complete preference/ordering (PM = 1) for one of the species M, which represents either Na(+) or Ca(2+). The MD-derived preference factors reveal phosphate and silicate species surrounded by Na(+)/Ca(2+) ions intermixed nearly randomly (PM ≲ 0.15), except for the QSi(4) and QSi(1) groups, which manifest more significant cation ordering with preference for Na+ and Ca2+, respectively. The overall weak preferences are essentially independent of the Si and P contents of the glass, whereas PM primarily correlates with the total amount of network modifiers: as the latter is increased, the Na/Ca distribution around the {QP(0), QSi(1), QSi(2)} groups with preference for Ca2(+ )tend to randomize (i.e., PCa decreases), while the PNa-values grow slightly for the {QP(1), QSi(3), QSi(4)} species already preferring coordination of Na. The set of experimental preference factors {PCa} for the orthophosphate (QP(0)) groups extracted from (31)P{(23)Na} REAPDOR NMR-derived M2(P–Na) dipolar second moments agrees well with the MD-generated counterparts. Our results on the Na/Ca intermixing in soda-lime-silicate glasses are discussed in relation to previous reports, highlighting the dependence of the conclusion on the approach to data evaluation.
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Affiliation(s)
- Renny Mathew
- Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Baltzar Stevensson
- Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Mattias Edén
- Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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21
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Brauer DS. Bioactive glasses—structure and properties. Angew Chem Int Ed Engl 2015; 54:4160-81. [PMID: 25765017 DOI: 10.1002/anie.201405310] [Citation(s) in RCA: 131] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 10/20/2014] [Indexed: 11/06/2022]
Abstract
Bioactive glasses were the first synthetic materials to show bonding to bone, and they are successfully used for bone regeneration. They can degrade in the body at a rate matching that of bone formation, and through a combination of apatite crystallization on their surface and ion release they stimulate bone cell proliferation, which results in the formation of new bone. Despite their excellent properties and although they have been in clinical use for nearly thirty years, their current range of clinical applications is still small. Latest research focuses on developing new compositions to address clinical needs, including glasses for treating osteoporosis, with antibacterial properties, or for the sintering of scaffolds with improved mechanical stability. This Review discusses how the glass structure controls the properties, and shows how a structure-based design may pave the way towards new bioactive glass implants for bone regeneration.
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Affiliation(s)
- Delia S Brauer
- Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstrasse 6, 07743 Jena (Germany) http://www.brauergroup.uni-jena.de.
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22
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23
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Nicolini V, Gambuzzi E, Malavasi G, Menabue L, Menziani MC, Lusvardi G, Pedone A, Benedetti F, Luches P, D’Addato S, Valeri S. Evidence of Catalase Mimetic Activity in Ce3+/Ce4+ Doped Bioactive Glasses. J Phys Chem B 2015; 119:4009-19. [DOI: 10.1021/jp511737b] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Valentina Nicolini
- Department
of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 183, 41125 Modena, Italy
| | - Elisa Gambuzzi
- Department
of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 183, 41125 Modena, Italy
| | - Gianluca Malavasi
- Department
of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 183, 41125 Modena, Italy
| | - Ledi Menabue
- Department
of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 183, 41125 Modena, Italy
| | - Maria Cristina Menziani
- Department
of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 183, 41125 Modena, Italy
| | - Gigliola Lusvardi
- Department
of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 183, 41125 Modena, Italy
| | - Alfonso Pedone
- Department
of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 183, 41125 Modena, Italy
| | - Francesco Benedetti
- Department
of Physical, Information and Mathematical Sciences, University of Modena and Reggio Emilia, Via Campi 213/a, 41125 Modena, Italy
- Istituto Nanoscienze−CNR, Via Campi 213/a, 41125 Modena, Italy
| | - Paola Luches
- Istituto Nanoscienze−CNR, Via Campi 213/a, 41125 Modena, Italy
| | - Sergio D’Addato
- Department
of Physical, Information and Mathematical Sciences, University of Modena and Reggio Emilia, Via Campi 213/a, 41125 Modena, Italy
- Istituto Nanoscienze−CNR, Via Campi 213/a, 41125 Modena, Italy
| | - Sergio Valeri
- Department
of Physical, Information and Mathematical Sciences, University of Modena and Reggio Emilia, Via Campi 213/a, 41125 Modena, Italy
- Istituto Nanoscienze−CNR, Via Campi 213/a, 41125 Modena, Italy
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24
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Tilocca A. Atomic-scale models of early-stage alkali depletion and SiO2-rich gel formation in bioactive glasses. Phys Chem Chem Phys 2015; 17:2696-702. [DOI: 10.1039/c4cp04711g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics simulations of Na+/H+-exchanged 45S5 Bioglass® reveal the co-existence of bonded and non-bonded hydroxyls, suggesting a direct mechanism for forming a silica-rich gel structure upon the initial ion exchange.
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Affiliation(s)
- Antonio Tilocca
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
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25
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Tilocca A. Cooling rate and size effects on the medium-range structure of multicomponent oxide glasses simulated by molecular dynamics. J Chem Phys 2014; 139:114501. [PMID: 24070291 DOI: 10.1063/1.4821150] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A set of molecular dynamics simulations were performed to investigate the effect of cooling rate and system size on the medium-range structure of melt-derived multicomponent silicate glasses, represented by the quaternary 45S5 Bioglass composition. Given the significant impact of the glass degradation on applications of these materials in biomedicine and nuclear waste disposal, bulk structural features which directly affect the glass dissolution process are of particular interest. Connectivity of the silicate matrix, ion clustering and nanosegregation, distribution of ring and chain structural patterns represent critical features in this context, which can be directly extracted from the models. A key issue is represented by the effect of the computational approach on the corresponding glass models, especially in light of recent indications questioning the suitability of conventional MD approaches (that is, involving melt-and-quench of systems containing ~10(3) atoms at cooling rates of 5-10 K/ps) when applied to model these glasses. The analysis presented here compares MD models obtained with conventional and nonconventional cooling rates and system sizes, highlighting the trend and range of convergence of specific structural features in the medium range. The present results show that time-consuming computational approaches involving much lower cooling rates and/or significantly larger system sizes are in most cases not necessary in order to obtain a reliable description of the medium-range structure of multicomponent glasses. We identify the convergence range for specific properties and use them to discuss models of several glass compositions for which a possible influence of cooling-rate or size effects had been previously hypothesized. The trends highlighted here represent an important reference to obtain reliable models of multicomponent glasses and extract converged medium-range structural features which affect the glass degradation and thus their application in different fields. In addition, as a first application of the present findings, the fully converged structure of the 45S5 glass was further analyzed to shed new light on several dissolution-related features whose interpretation has been rather controversial in the past.
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Affiliation(s)
- Antonio Tilocca
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
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26
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Mathew R, Stevensson B, Tilocca A, Edén M. Toward a rational design of bioactive glasses with optimal structural features: composition-structure correlations unveiled by solid-state NMR and MD simulations. J Phys Chem B 2014; 118:833-44. [PMID: 24364818 PMCID: PMC3905695 DOI: 10.1021/jp409652k] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The
physiological responses of silicate-based bioactive glasses (BGs)
are known to depend critically on both the P content (nP) of the glass and its silicate network connectivity
(N̅BOSi). However, while the bioactivity generally
displays a nonmonotonic dependence on nP itself, recent work suggest that it is merely the net orthophosphate
content that directly links to the bioactivity. We exploit molecular
dynamics (MD) simulations combined with 31P and 29Si solid-state nuclear magnetic resonance (NMR) spectroscopy to explore
the quantitative relationships between N̅BOSi, nP, and the silicate and phosphate speciations in a series
of Na2O–CaO–SiO2–P2O5 glasses spanning 2.1 ≤ N̅BOSi ≤
2.9 and variable P2O5 contents up to 6.0 mol
%. The fractional population of the orthophosphate groups remains
independent of nP at a fixed N̅BOSi-value,
but is reduced slightly as N̅BOSi increases. Nevertheless, P
remains predominantly as readily released orthophosphate ions, whose
content may be altered essentially independently of the network connectivity,
thereby offering a route to optimize the glass bioactivity. We discuss
the observed composition-structure links in relation to known composition-bioactivity
correlations, and define how Na2O–CaO–SiO2–P2O5 compositions exhibiting
an optimal bioactivity can be designed by simultaneously altering
three key parameters: the silicate network connectivity, the (ortho)phosphate
content, and the nNa/nCa molar ratio.
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Affiliation(s)
- Renny Mathew
- Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University , SE-106 91, Stockholm, Sweden
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27
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Gambuzzi E, Pedone A. On the structure of Ce-containing silicophosphate glasses: a core–shell molecular dynamics investigation. Phys Chem Chem Phys 2014; 16:21645-56. [DOI: 10.1039/c4cp02577f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New Ce3+–O and Ce4+–O parameters for a force-field based on the core–shell model were developed and applied to get insights into the structure of five silicophosphate glasses with increasing Ce2O3 and P2O5 content.
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Affiliation(s)
- Elisa Gambuzzi
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Modena e Reggio Emilia
- Modena, Italy
| | - Alfonso Pedone
- Dipartimento di Scienze Chimiche e Geologiche
- Università degli Studi di Modena e Reggio Emilia
- Modena, Italy
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28
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Tilocca A. Current challenges in atomistic simulations of glasses for biomedical applications. Phys Chem Chem Phys 2014; 16:3874-80. [DOI: 10.1039/c3cp54913e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Atomic-scale simulations of bioglasses are being used to tackle several challenging aspects, such as new structural markers of bioactivity, ion migration and nanosized samples.
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Affiliation(s)
- Antonio Tilocca
- Department of Chemistry
- University College London
- London WC1H 0AJ, UK
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29
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Di Tommaso D, Ainsworth RI, Tang E, de Leeuw NH. Modelling the structural evolution of ternary phosphate glasses from melts to solid amorphous materials. J Mater Chem B 2013; 1:5054-5066. [DOI: 10.1039/c3tb20662a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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