1
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Bacchi M, Fernandes E, Mazola Y, Gonzaga C. Stability of sodium mass fraction in agricultural certified reference materials. TALANTA OPEN 2022. [DOI: 10.1016/j.talo.2022.100097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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2
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Sahu P, Ali SM. Tuning Network Connectivity of Silicate and Sodium Borosilicate Glasses by TiO 2 for Enhanced Chemical Durability: Molecular Dynamics Simulation Investigations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:7639-7663. [PMID: 35678225 DOI: 10.1021/acs.langmuir.2c01081] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Extensive molecular dynamics (MD) simulations were performed to disclose the beneficial aspects of TiO2 doping in SiO2 and sodium borosilicate (NBS) glasses. Significant amendment in short- and intermediate-range orders of glasses was captured by the radial distribution function, coordination number, bond/angle distribution profiles, structure factor, and probability of linking X-O-X' (where X and/or X' = Si, B, and Ti) structural motifs. Successively, the effect of microscopic structural modification on the macroscopic properties was analyzed in terms of mechanical strength, thermal stability, vibrational characteristics [(vibrational density of states (VDOS)], and chemical durability. The results show that Ti participates in the network chain in the form of TiO6 and TiO5 for the Ti-NBS glass whereas in the form of TiO6, TiO5, and TiO4 for the binary TiO2-SiO2 glass. The presence of TiO2 was found to strengthen the glass skeleton. However, the glass-transition temperature was also increased with Ti addition, which indicates increased hurdles during synthesis due to increased cross connections in the glass network with Ti doping. The computed results envisage enhanced chemical durability of Ti-added glasses. In addition, VDOS spectra showed network former-like characteristics of Ti in the glass network with significant contributions up to a vibration frequency of 800 cm-1. The strong binding of Ti-O-connected Na+ in the glass skeleton prevents Na+ migration toward the interface or bulk aqueous phase, which contributes to improved chemical stability of Ti-containing glasses. During contact with water, Na+ were less likely to leach out from glass to the aqueous solution during Ti doping. In addition, the increased fraction of stable ring structures (5m-7m) for Ti-NBS glasses than bare NBS glasses also supports the increased leaching resistivity of Ti-added glasses. Essentially, the elucidation of macroscopic glass properties has been provided in terms of microscopic understanding. The present findings will incite further MD simulations and experiments to disclose more interesting microstructures and dynamics due to the presence of TiO2 in glasses.
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Affiliation(s)
- Pooja Sahu
- Chemical Engineering Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra 400085, India
- Homi Bhabha National Institute, Mumbai, Maharashtra 400094, India
| | - Sk Musharaf Ali
- Chemical Engineering Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra 400085, India
- Homi Bhabha National Institute, Mumbai, Maharashtra 400094, India
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3
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Borges R, Kai KC, Lima CA, Zezell DM, de Araujo DR, Marchi J. Bioactive glass/poloxamer 407 hydrogel composite as a drug delivery system: The interplay between glass dissolution and drug release kinetics. Colloids Surf B Biointerfaces 2021; 206:111934. [PMID: 34182428 DOI: 10.1016/j.colsurfb.2021.111934] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/31/2021] [Accepted: 06/18/2021] [Indexed: 12/15/2022]
Abstract
Since patients suffer pain in the post-surgery of bone repair interventions, bioactive glass/hydrogel drug delivery systems containing local anesthetics, such as ropivacaine, could improve patient life quality by combining bone regeneration with anesthetics. However, poloxamer-based hydrogel properties are sensitive to ions, temperature, and water contents and could be structurally influenced by the ionic dissolution products from bioactive glasses of different compositions. Therefore, this study evaluated the interplay between bioactive glass dissolution kinetics and poloxamer 407 properties, establishing a correlation between changes in the hydrogel and drug release kinetics. Three glass compositions were produced, yielding Ca-rich, Na-rich, and an intermediate glass composition. The influence of Ca/Na ratios on the glass structure and dissolution was investigated. Further, the glasses and ropivacaine were incorporated in the poloxamer hydrogel, and the self-assembly ability of poloxamer, the degradation rate, and the drug release kinetics of the composites were evaluated. The results suggested that glass connectivity affected the early-stage of glass dissolution, while sodium mobility influenced the long-term. The dissolution products from the glasses interact with the supramolecular structure of the poloxamer, causing structural changes responsible for hydrogel degradation. Consequently, by changing the Ca/Na ratio in the glasses, it is possible to modulate glass dissolution that, in turn, influences the ropivacaine release. Thus, we propose that the Ca/Na ratio in quaternary bioactive glasses can be used to modulate drug-delivery properties from systems based on bioactive glasses and poloxamer 407.
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Affiliation(s)
- Roger Borges
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida Estados Unidos 5001, Bairro Bangu, Santo André, SP, Brazil.
| | - Karen C Kai
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida Estados Unidos 5001, Bairro Bangu, Santo André, SP, Brazil.
| | - Cassio A Lima
- Centro de Lasers e Aplicações, Instituto de Pesquisas Energéticas e Nucleares, Avenida Prof. Almeida Prado 2242, Butantã, São Paulo, SP, Brazil; Institute of Integrative Biology, University of Liverpool, Crown Street, Liverpool, L69 7ZB, United Kingdom.
| | - Denise M Zezell
- Centro de Lasers e Aplicações, Instituto de Pesquisas Energéticas e Nucleares, Avenida Prof. Almeida Prado 2242, Butantã, São Paulo, SP, Brazil.
| | - Daniele R de Araujo
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida Estados Unidos 5001, Bairro Bangu, Santo André, SP, Brazil.
| | - Juliana Marchi
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida Estados Unidos 5001, Bairro Bangu, Santo André, SP, Brazil.
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4
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Serva A, Guerault A, Ishii Y, Gouillart E, Burov E, Salanne M. Structural and dynamic properties of soda–lime–silica in the liquid phase. J Chem Phys 2020; 153:214505. [DOI: 10.1063/5.0029702] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Affiliation(s)
- Alessandra Serva
- Sorbonne Université, CNRS, Physico-Chimie des Electrolytes et Nanosystèmes Interfaciaux, PHENIX, F-75005 Paris, France
| | - Allan Guerault
- Sorbonne Université, CNRS, Physico-Chimie des Electrolytes et Nanosystèmes Interfaciaux, PHENIX, F-75005 Paris, France
- Surface du Verre et Interface (UMR 125), CNRS/Saint-Gobain Research Paris, 39 quai Lucien Lefranc, 93300 Aubervilliers, France
| | - Yoshiki Ishii
- Graduate School of Simulation Studies, University of Hyogo, 7-1-28 Minatojima-Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
| | - Emmanuelle Gouillart
- Surface du Verre et Interface (UMR 125), CNRS/Saint-Gobain Research Paris, 39 quai Lucien Lefranc, 93300 Aubervilliers, France
| | - Ekaterina Burov
- Surface du Verre et Interface (UMR 125), CNRS/Saint-Gobain Research Paris, 39 quai Lucien Lefranc, 93300 Aubervilliers, France
| | - Mathieu Salanne
- Sorbonne Université, CNRS, Physico-Chimie des Electrolytes et Nanosystèmes Interfaciaux, PHENIX, F-75005 Paris, France
- Institut Universitaire de France (IUF), 75231 Paris Cedex 05, France
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Delpino GP, Borges R, Zambanini T, Joca JFS, Gaubeur I, de Souza ACS, Marchi J. Sol-gel-derived 58S bioactive glass containing holmium aiming brachytherapy applications: A dissolution, bioactivity, and cytotoxicity study. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 119:111595. [PMID: 33321639 DOI: 10.1016/j.msec.2020.111595] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 09/28/2020] [Accepted: 09/29/2020] [Indexed: 01/06/2023]
Abstract
Bioactive glasses containing rare earth elements have been proposed as promising candidates for applications in brachytherapy of bone cancer. However, their safety relies on a proper dissolution to avoid radioactive materials in the human body, and desirable bioactive properties to regenerate the bone defect caused by the tumor. In this work, we proposed a new series of sol-gel-derived bioactive glasses containing holmium oxide, based on the system (100-x)(58SiO2-33CaO-9P2O5)-xHo2O3 (x = 1.25, 2.5 and 5 wt%). The glasses were characterized regarding their dissolution behavior, bioactivity, and cytotoxicity with pre-osteoblastic cells. Also, in the dissolution experiments, the Arrhenius and Eyring equations were used to obtain some thermodynamic properties of glass dissolution. The results evidenced that the addition of holmium ions in the glass structure decreased the energy barrier of hydrolysis reactions, which favors glass dissolution in an early-stage. However, in the long-term, the strength of Si-O-Ho bonds may be the cause of more stable dissolution. Besides, glasses containing holmium were as bioactive as the 58S bioactive glasses, a highly bioactive composition. Cytotoxicity results showed that all glasses were not cytotoxic, and the composition containing 5 wt.% of Ho2O3 enhanced cell viability. Finally, these results suggest that these glasses are suitable materials for brachytherapy applications due to their proper dissolution behavior, high bioactivity, and high cell viability.
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Affiliation(s)
| | - Roger Borges
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
| | - Telma Zambanini
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
| | | | - Ivanise Gaubeur
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
| | | | - Juliana Marchi
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil.
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6
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Matinmanesh A, Li Y, Nouhi A, Zalzal P, Schemitsch E, Towler M, Papini M. Evaluating the critical strain energy release rate of bioactive glass coatings on Ti6Al4V substrates after degradation. J Mech Behav Biomed Mater 2018; 78:273-281. [DOI: 10.1016/j.jmbbm.2017.11.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 11/06/2017] [Accepted: 11/09/2017] [Indexed: 10/18/2022]
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7
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Rodriguez O, Stone W, Schemitsch EH, Zalzal P, Waldman S, Papini M, Towler MR. Titanium addition influences antibacterial activity of bioactive glass coatings on metallic implants. Heliyon 2017; 3:e00420. [PMID: 29034340 PMCID: PMC5635952 DOI: 10.1016/j.heliyon.2017.e00420] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 07/24/2017] [Accepted: 09/24/2017] [Indexed: 11/19/2022] Open
Abstract
In an attempt to combat the possibility of bacterial infection and insufficient bone growth around metallic, surgical implants, bioactive glasses may be employed as coatings. In this work, silica-based and borate-based glass series were synthesized for this purpose and subsequently characterized in terms of antibacterial behavior, solubility and cytotoxicity. Borate-based glasses were found to exhibit significantly superior antibacterial properties and increased solubility compared to their silica-based counterparts, with BRT0 and BRT3 (borate-based glasses with 0 and 15 mol% of titanium dioxide incorporated, respectively) outperforming the remainder of the glasses, both borate and silicate based, in these respects. Atomic Absorption Spectroscopy confirmed the release of zinc ions (Zn2+), which has been linked to the antibacterial abilities of glasses SRT0, BRT0 and BRT3, with inhibition effectively achieved at concentrations lower than 0.7 ppm. In vitro cytotoxicity studies using MC3T3-E1 osteoblasts confirmed that cell proliferation was affected by all glasses in this study, with decreased proliferation attributed to a faster release of sodium ions over calcium ions in both glass series, factor known to slow cell proliferation in vitro.
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Affiliation(s)
- Omar Rodriguez
- Department of Mechanical & Industrial Engineering, Ryerson University, Toronto M5B 2K3, Ontario, Canada
- St. Michael’s Hospital, Toronto M5B 1W8, Ontario, Canada
- Corresponding author at:
| | - Wendy Stone
- Department of Chemistry and Biology, Ryerson University, Toronto M5B 2K3, Ontario, Canada
| | - Emil H. Schemitsch
- St. Michael’s Hospital, Toronto M5B 1W8, Ontario, Canada
- Department of Surgery, University of Western Ontario, London, ON N6A 4V2, Canada
| | - Paul Zalzal
- Oakville Trafalgar Memorial Hospital, Oakville L6J 3L7, Ontario, Canada
- Faculty of Health Sciences, Department of Surgery, McMaster University, Hamilton L8S 4L8, Ontario, Canada
| | - Stephen Waldman
- St. Michael’s Hospital, Toronto M5B 1W8, Ontario, Canada
- Department of Chemical Engineering, Ryerson University, Toronto M5B 2K3, Ontario, Canada
| | - Marcello Papini
- Department of Mechanical & Industrial Engineering, Ryerson University, Toronto M5B 2K3, Ontario, Canada
| | - Mark R. Towler
- Department of Mechanical & Industrial Engineering, Ryerson University, Toronto M5B 2K3, Ontario, Canada
- St. Michael’s Hospital, Toronto M5B 1W8, Ontario, Canada
- Department of Biomedical Engineering, University of Malaya, Kuala Lumpur, Malaysia
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8
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Lopes JH, Fonseca EMB, Mazali IO, Magalhães A, Landers R, Bertran CA. Facile and innovative method for bioglass surface modification: Optimization studies. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 72:86-97. [DOI: 10.1016/j.msec.2016.11.044] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 10/10/2016] [Accepted: 11/13/2016] [Indexed: 10/20/2022]
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9
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Tilocca A. Dynamical descriptors of bioactivity: a correlation between chemical durability and ion migration in biodegradable glasses. Phys Chem Chem Phys 2017; 19:6334-6337. [DOI: 10.1039/c6cp07203h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics simulations reveal the importance of using dynamical descriptors to rationalize and predict the behavior of biomedical glasses.
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Affiliation(s)
- Antonio Tilocca
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
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10
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Li Y, Stone W, Schemitsch EH, Zalzal P, Papini M, Waldman SD, Towler MR. Antibacterial and osteo-stimulatory effects of a borate-based glass series doped with strontium ions. J Biomater Appl 2016; 31:674-683. [PMID: 27671104 DOI: 10.1177/0885328216672088] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This work considered the effect of both increasing additions of Strontium (Sr2+) and incubation time on solubility and both antibacterial and osteo-stimulatory effects of a series of glasses based on the B2O3-P2O5-CaCO3-Na2CO3-TiO2-SrCO3 series. The amorphous nature of all the glasses was confirmed by X-ray diffraction. Discs of each glass were immersed in de-ionized water for 1, 7 and 30 days, and the water extracts were used for ion release profiles, pH measurements and cytotoxicity testing. Atomic absorption spectroscopy was employed to detect the release of Na+, Ca2+ and Sr2+ ions from the glasses with respect to maturation, which indicated that the addition of Sr2+ retarded solubility of the glass series. This effect was also confirmed by weight loss analysis through comparing the initial weight of glass discs before and after periods of incubation. The incorporation of Sr2+ in the glasses did not influence the pH of the water extracts when the glasses were stored for up to 30 days. Cytotoxicity testing with an osteoblastic cell line (MC3T3-E1) indicated that glasses with the higher (20 mol% and 25 mol%) Sr2+ incorporation promoted proliferation of osteoblast cells, while the glasses with lower Sr2+ contents inhibited cell growth. The glass series, except for Ly-B5 (which contained the highest Sr2+ incorporation; 25 mol%), were bacteriostatic against S. aureus in the short term (1-7 days) as a result of the dissolution products released.
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Affiliation(s)
- Yiming Li
- Department of Mechanical & Industrial Engineering, Ryerson University, Toronto, ON, Canada Keenan Research Centre, St. Michael's Hospital, Toronto, ON, Canada
| | - Wendy Stone
- Chemistry and Biology, Ryerson University, Toronto, ON, Canada
| | | | - Paul Zalzal
- Oakville Memorial Hospital, Oakville, ON, Canada
| | - Marcello Papini
- Department of Mechanical & Industrial Engineering, Ryerson University, Toronto, ON, Canada
| | - Stephen D Waldman
- Chemistry and Biology, Ryerson University, Toronto, ON, Canada Chemical Engineering, Ryerson University, Toronto, ON, Canada
| | - Mark R Towler
- Department of Mechanical & Industrial Engineering, Ryerson University, Toronto, ON, Canada Chemistry and Biology, Ryerson University, Toronto, ON, Canada
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11
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Konstantinou K, Sushko PV, Duffy DM. Modelling the local atomic structure of molybdenum in nuclear waste glasses with ab initio molecular dynamics simulations. Phys Chem Chem Phys 2016; 18:26125-26132. [PMID: 27711386 DOI: 10.1039/c6cp03076a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The nature of chemical bonding of molybdenum in high level nuclear waste glasses has been elucidated by ab initio molecular dynamics simulations. Two compositions, (SiO2)57.5-(B2O3)10-(Na2O)15-(CaO)15-(MoO3)2.5 and (SiO2)57.3-(B2O3)20-(Na2O)6.8-(Li2O)13.4-(MoO3)2.5, were considered in order to investigate the effect of ionic and covalent components on the glass structure and the formation of the crystallisation precursors (Na2MoO4 and CaMoO4). The coordination environments of Mo cations and the corresponding bond lengths calculated from our model are in excellent agreement with experimental observations. The analysis of the first coordination shell reveals two different types of molybdenum host matrix bonds in the lithium sodium borosilicate glass. Based on the structural data and the bond valence model, we demonstrate that the Mo cation can be found in a redox state and the molybdate tetrahedron can be connected with the borosilicate network in a way that inhibits the formation of crystalline molybdates. These results significantly extend our understanding of bonding in Mo-containing nuclear waste glasses and demonstrate that tailoring the glass composition to specific heavy metal constituents can facilitate incorporation of heavy metals at high concentrations.
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Affiliation(s)
| | - Peter V Sushko
- Physical Sciences Division, Physical & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Dorothy M Duffy
- Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK.
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12
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Brückner R, Tylkowski M, Hupa L, Brauer DS. Controlling the ion release from mixed alkali bioactive glasses by varying modifier ionic radii and molar volume. J Mater Chem B 2016; 4:3121-3134. [DOI: 10.1039/c5tb02426a] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Modifier ionic radius controls ion release from bioactive phospho-silicate glasses via silicate network compactness.
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Affiliation(s)
- Raika Brückner
- Otto Schott Institute of Materials Research
- Friedrich Schiller University Jena
- 07743 Jena
- Germany
| | - Maxi Tylkowski
- Otto Schott Institute of Materials Research
- Friedrich Schiller University Jena
- 07743 Jena
- Germany
| | - Leena Hupa
- Johan Gadolin Process Chemistry Centre
- Åbo Akademi University
- FI-20500 Turku
- Finland
| | - Delia S. Brauer
- Otto Schott Institute of Materials Research
- Friedrich Schiller University Jena
- 07743 Jena
- Germany
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13
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Cortez PP, Brito AF, Kapoor S, Correia AF, Atayde LM, Dias‐Pereira P, Maurício AC, Afonso A, Goel A, Ferreira JM. The
in vivo
performance of an alkali‐free bioactive glass for bone grafting,
F
ast
O
s
®
BG
, assessed with an ovine model. J Biomed Mater Res B Appl Biomater 2015; 105:30-38. [DOI: 10.1002/jbm.b.33529] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 08/04/2015] [Accepted: 09/05/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Paulo P. Cortez
- Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto (ICBAS‐UP)4050‐313Porto Portugal
- Centro de Estudos de Ciência AnimalInstituto de Ciências e Tecnologias Agrárias e Agro‐Alimentares (CECA‐ICETA), Universidade do Porto4485‐661Vairão Portugal
| | - Ana F. Brito
- Reg4life − Regeneration TechnologyS.A., Biocant, Parque Tecnológico de Cantanhede3060‐197Cantanhede Portugal
| | - Saurabh Kapoor
- Departamento de Engenharia de Materiais e CerâmicaUniversidade de Aveiro (UA), CICECO3810‐193Aveiro Portugal
| | - Ana F. Correia
- Departamento de Engenharia de Materiais e CerâmicaUniversidade de Aveiro (UA), CICECO3810‐193Aveiro Portugal
| | - Luis M. Atayde
- Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto (ICBAS‐UP)4050‐313Porto Portugal
- Centro de Estudos de Ciência AnimalInstituto de Ciências e Tecnologias Agrárias e Agro‐Alimentares (CECA‐ICETA), Universidade do Porto4485‐661Vairão Portugal
| | - Patrícia Dias‐Pereira
- Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto (ICBAS‐UP)4050‐313Porto Portugal
| | - Ana Colette Maurício
- Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto (ICBAS‐UP)4050‐313Porto Portugal
- Centro de Estudos de Ciência AnimalInstituto de Ciências e Tecnologias Agrárias e Agro‐Alimentares (CECA‐ICETA), Universidade do Porto4485‐661Vairão Portugal
| | - Américo Afonso
- Faculdade de Medicina Dentária da Universidade do Porto (FMD‐UP)4200‐393Porto Portugal
| | - Ashutosh Goel
- Department of Materials Science and EngineeringRutgers, The State University of New JerseyPiscataway New Jersey08854‐8065
| | - José M.F. Ferreira
- Departamento de Engenharia de Materiais e CerâmicaUniversidade de Aveiro (UA), CICECO3810‐193Aveiro Portugal
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14
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Kapoor S, Semitela Â, Goel A, Xiang Y, Du J, Lourenço AH, Sousa DM, Granja PL, Ferreira JMF. Understanding the composition-structure-bioactivity relationships in diopside (CaO·MgO·2SiO₂)-tricalcium phosphate (3CaO·P₂O₅) glass system. Acta Biomater 2015; 15:210-26. [PMID: 25578990 DOI: 10.1016/j.actbio.2015.01.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 12/20/2014] [Accepted: 01/02/2015] [Indexed: 12/31/2022]
Abstract
The present work is an amalgamation of computation and experimental approach to gain an insight into composition-structure-bioactivity relationships of alkali-free bioactive glasses in the CaO-MgO-SiO2-P2O5 system. The glasses have been designed in the diopside (CaO·MgO·2SiO2; Di)-tricalcium phosphate (3CaO·P2O5; TCP) binary join by varying the Di/TCP ratio. The melt-quenched glasses have been investigated for their structure by molecular dynamic (MD) simulations as well as by nuclear magnetic resonance spectroscopy (NMR). In all the investigated glasses silicate and phosphate components are dominated by Q(2) (Si) and Q(0) (P) species, respectively. The apatite forming ability of the glasses was investigated using X-ray diffraction (XRD), infrared spectroscopy after immersion of glass powders in simulated body fluid (SBF) for time durations varying between 1 h and 14 days, while their chemical degradation has been studied in Tris-HCl in accordance with ISO 10993-14. All the investigated glasses showed good bioactivity without any substantial variation. A significant statistical increase in metabolic activity of human mesenchymal stem cells (hMSCs) when compared to the control was observed for Di-60 and Di-70 glass compositions under both basal and osteogenic conditions.
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Affiliation(s)
- Saurabh Kapoor
- Department of Materials and Ceramics Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal
| | - Ângela Semitela
- Department of Materials and Ceramics Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal; INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal
| | - Ashutosh Goel
- Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8065, United States.
| | - Ye Xiang
- Department of Materials Science and Engineering, University of North Texas, United States
| | - Jincheng Du
- Department of Materials Science and Engineering, University of North Texas, United States
| | - Ana H Lourenço
- INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal; Faculdade de Engenharia da Universidade do Porto (FEUP), Porto, Portugal
| | - Daniela M Sousa
- INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal
| | - Pedro L Granja
- INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal; Faculdade de Engenharia da Universidade do Porto (FEUP), Porto, Portugal; Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal
| | - José M F Ferreira
- Department of Materials and Ceramics Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal.
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15
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Jay EE, Rushton MJD, Chroneos A, Grimes RW, Kilner JA. Genetics of superionic conductivity in lithium lanthanum titanates. Phys Chem Chem Phys 2015; 17:178-83. [DOI: 10.1039/c4cp04834b] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using a genetic algorithm in conjunction with molecular dynamics we describe diffusion mechanisms and provide evidence that there is a 3D percolated network of Li diffusion pathways in La2/3−xLi3xTiO3.
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Affiliation(s)
- E. E. Jay
- Department of Materials
- Imperial College
- London
- UK
| | | | - A. Chroneos
- Faculty of Engineering and Computing
- Coventry University
- Coventry CV1 2JH
- UK
| | | | - J. A. Kilner
- Department of Materials
- Imperial College
- London
- UK
- CIC Energigune Parque Tecnológico C/Albert Einstein
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16
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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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17
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Kansal I, Reddy A, Muñoz F, Choi SJ, Kim HW, Tulyaganov DU, Ferreira JMF. Structure, biodegradation behavior and cytotoxicity of alkali-containing alkaline-earth phosphosilicate glasses. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 44:159-65. [PMID: 25280692 DOI: 10.1016/j.msec.2014.08.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2014] [Revised: 07/16/2014] [Accepted: 08/03/2014] [Indexed: 11/24/2022]
Abstract
We report on the effect of sodium on the structure, chemical degradation and bioactivity of glasses in the CaO-MgO-SiO2-P2O5-CaF2 system. The (29)Si and (31)P magic angle spinning-nuclear magnetic resonance spectroscopy of melt-quenched glasses with varying Na2O/MgO ratios exhibit a silicate glass network with the dominance of Q(2)(Si) units and phosphorus mainly forming orthophosphate species. Sodium incorporation in the glasses did not induce a significant structural change in the silicate network, while it did influence the phosphate environment due to its lower ionic field strength in comparison with that of magnesium. The apatite forming ability of glasses has been investigated by immersion of glass powders in simulated body fluid (SBF) for time durations varying between 1h and 7 days while their chemical degradation has been studied in Tris-HCl in accordance with ISO-10993-14. Increasing Na(+)/Mg(2+) ratio caused a decrease in the chemical durability of glasses and in the apatite forming ability especially during initial steps of interaction between glass and SBF solution. The cellular responses were observed in vitro on bulk glass samples using mouse-derived pre-osteoblastic MC3T3-E1 cell line. The preliminary study suggested that the increasing alkali-concentration in glasses led to cytotoxicity in the cell culture medium.
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Affiliation(s)
- Ishu Kansal
- Department of Materials and Ceramics Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal
| | - AlluAmarnath Reddy
- Department of Materials and Ceramics Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal
| | - Francisco Muñoz
- Ceramics and Glass Institute (CSIC), Kelsen 5, 28049 Madrid, Spain
| | - Seong-Jun Choi
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan 330714, South Korea; Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 330714, South Korea
| | - Hae-Won Kim
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan 330714, South Korea; Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 330714, South Korea; Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan 330714, South Korea
| | | | - José M F Ferreira
- Department of Materials and Ceramics Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal.
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18
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Kapoor S, Goel A, Tilocca A, Dhuna V, Bhatia G, Dhuna K, Ferreira JMF. Role of glass structure in defining the chemical dissolution behavior, bioactivity and antioxidant properties of zinc and strontium co-doped alkali-free phosphosilicate glasses. Acta Biomater 2014; 10:3264-78. [PMID: 24709542 DOI: 10.1016/j.actbio.2014.03.033] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Revised: 03/19/2014] [Accepted: 03/30/2014] [Indexed: 11/19/2022]
Abstract
We investigated the structure-property relationships in a series of alkali-free phosphosilicate glass compositions co-doped with Zn(2+) and Sr(2+). The emphasis was laid on understanding the structural role of Sr(2+) and Zn(2+) co-doping on the chemical dissolution behavior of glasses and its impact on their in vitro bioactivity. The structure of glasses was studied using molecular dynamics simulations in combination with solid state nuclear magnetic resonance spectroscopy. The relevant structural properties are then linked to the observed degradation behavior, in vitro bioactivity, osteoblast proliferation and oxidative stress levels. The apatite-forming ability of glasses has been investigated by X-ray diffraction, infrared spectroscopy and scanning electron microscopy-energy-dispersive spectroscopy after immersion of glass powders/bulk in simulated body fluid (SBF) for time durations varying between 1h and 14 days, while their chemical degradation has been studied in Tris-HCl in accordance with ISO 10993-14. All the glasses exhibit hydroxyapatite formation on their surface within 1-3h of their immersion in SBF. The cellular responses were observed in vitro on bulk glass samples using human osteosarcoma MG63 cell line. The dose-dependent cytoprotective effect of glasses with respect to the concentration of zinc and strontium released from the glasses is also discussed.
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Affiliation(s)
- Saurabh Kapoor
- Department of Materials and Ceramic Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal
| | - Ashutosh Goel
- Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8065, USA.
| | - Antonio Tilocca
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Vikram Dhuna
- Department of Biotechnology, DAV College, Amritsar 143-001, Punjab, India
| | - Gaurav Bhatia
- Department of Molecular Biology and Biochemistry, Guru Nanak Dev University, Amritsar 143-005, Punjab, India
| | - Kshitija Dhuna
- Department of Molecular Biology and Biochemistry, Guru Nanak Dev University, Amritsar 143-005, Punjab, India
| | - José M F Ferreira
- Department of Materials and Ceramic Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal.
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19
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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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20
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Berardo E, Corno M, Cormack AN, Ugliengo P, Tilocca A. Probing the fate of interstitial water in bulk bioactive glass by ab initio simulations. RSC Adv 2014. [DOI: 10.1039/c4ra05810k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The mechanism and effects of the interaction of a water molecule with different sites found in the bulk of 45S5 bioactive glass have been investigated through ab initio simulations.
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Affiliation(s)
- Enrico Berardo
- Department of Chemistry
- University College London
- London WC1H 0AJ, UK
| | - Marta Corno
- Dipartimento di Chimica and NIS (Nanostructured Interfaces and Surfaces)
- Universitá di Torino
- 10125 Torino, Italy
| | | | - Piero Ugliengo
- Dipartimento di Chimica and NIS (Nanostructured Interfaces and Surfaces)
- Universitá di Torino
- 10125 Torino, Italy
| | - Antonio Tilocca
- Department of Chemistry
- University College London
- London WC1H 0AJ, UK
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21
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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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22
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Malik J, Tilocca A. Hydration Effects on the Structural and Vibrational Properties of Yttrium Aluminosilicate Glasses for in Situ Radiotherapy. J Phys Chem B 2013; 117:14518-28. [DOI: 10.1021/jp4073203] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jahangir Malik
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Antonio Tilocca
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
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23
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Berardo E, Pedone A, Ugliengo P, Corno M. DFT modeling of 45S5 and 77S soda-lime phospho-silicate glass surfaces: clues on different bioactivity mechanism. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5749-5759. [PMID: 23594027 DOI: 10.1021/la304795w] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The reactivity of bioglasses, which is related to the dissolution of cations and orthosilicate groups in the physiological fluid, strongly depends on the key structural features present at the glass surfaces. On the basis of the composition and the synthetic routes employed to make the glass, surfaces with very different characteristics and thus presenting different mechanisms of dissolution can be observed. In this paper, the surface structures of two very different bioglass compositions, namely 45S5 (46.1 SiO2, 24.4 Na2O, 26.9 CaO, and 2.6 P2O5 mol %) and 77S (80.0 SiO2, 16.0 CaO, and 4.0 P2O5 mol %), have been investigated by means of periodic DFT calculations based on a PBE functional and localized Gaussian basis set as encoded in the CRYSTAL code. Our calculations show that the two glass surfaces differ by the relative amount of key structural sites such as NBOs, exposed ions, orthosilicate units, and small rings. We have demonstrated how the number of these sites affects the surface stability and reactivity (bioactivity).
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Affiliation(s)
- Enrico Berardo
- Dipartimento di Chimica and NIS-Nanostructured Interfaces and Surfaces-Centre of Excellence, Università degli Studi di Torino, Torino, Italy
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24
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Christie JK, Tilocca A. Molecular Dynamics Simulations and Structural Descriptors of Radioisotope Glass Vectors for In Situ Radiotherapy. J Phys Chem B 2012; 116:12614-20. [DOI: 10.1021/jp304200f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jamieson K. Christie
- Department of Chemistry and Thomas
Young Centre, University College London, 20 Gordon Street, London
WC1H 0AJ, U.K
| | - Antonio Tilocca
- Department of Chemistry and Thomas
Young Centre, University College London, 20 Gordon Street, London
WC1H 0AJ, U.K
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25
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Bauchy M. Structural, vibrational, and thermal properties of densified silicates: Insights from molecular dynamics. J Chem Phys 2012; 137:044510. [DOI: 10.1063/1.4738501] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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27
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Christie JK, Malik J, Tilocca A. Bioactive glasses as potential radioisotope vectors for in situ cancer therapy: investigating the structural effects of yttrium. Phys Chem Chem Phys 2011; 13:17749-55. [PMID: 21887425 DOI: 10.1039/c1cp21764j] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The incorporation of yttrium in bioactive glasses (BGs) could lead to a new generation of radionuclide vectors for cancer therapy, with high biocompatibility, controlled biodegradability and the ability to enhance the growth of new healthy tissues after the treatment with radionuclides. It is essential to assess whether and to what extent yttrium incorporation affects the favourable properties of the BG matrix: ideally, one would like to combine the high surface reactivity typical of BGs with a slow release of radioactive yttrium. Molecular Dynamics simulations show that, compared to a BG composition with the same silica fraction, incorporation of yttrium results in two opposing effects on the glass durability: a more fragmented silicate network (leading to lower durability) and a stronger yttrium-mediated association between separate silicate fragments (leading to higher durability). The simulations also highlight a high site-selectivity and some clustering of yttrium cations, which are likely linked to the observed slow rate of yttrium released from related Y-BG compositions. Optimisation of yttrium BG compositions for radiotherapy applications thus depends on the delicate balance between these effects.
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Affiliation(s)
- Jamieson K Christie
- Department of Chemistry and Thomas Young Centre, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
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28
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Christie JK, Pedone A, Menziani MC, Tilocca A. Fluorine Environment in Bioactive Glasses: ab Initio Molecular Dynamics Simulations. J Phys Chem B 2011; 115:2038-45. [DOI: 10.1021/jp110788h] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Jamieson K. Christie
- Department of Chemistry and Thomas Young Centre, University College London, London WC1H 0AJ, U.K
| | | | | | - Antonio Tilocca
- Department of Chemistry and Thomas Young Centre, University College London, London WC1H 0AJ, U.K
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29
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Tilocca A, Cormack AN. The initial stages of bioglass dissolution: a Car–Parrinello molecular-dynamics study of the glass–water interface. Proc Math Phys Eng Sci 2011. [DOI: 10.1098/rspa.2010.0519] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The initial dissolution stages following implantation of a biomaterial in a physiological environment are critical for its bioactive properties. Car–Parrinello molecular-dynamics (CPMD) simulations of the interface between the 45S5 bioglass surface and liquid water have been carried out to investigate these processes. The analysis of a 40 ps CPMD trajectory has highlighted the potential mechanism of Na
+
/H
+
exchange, leading to formation of surface silanols through water dissociation. Moreover, by comparing the properties of water layers arranged at different distances from the glass surface, we discuss the way in which the particular structure and composition of the bioglass surface affects the hydrogen-bond network and orientation of water in its close proximity.
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Affiliation(s)
- Antonio Tilocca
- Department of Chemistry and Thomas Young Centre for Theory and Simulations of Materials, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Alastair N. Cormack
- New York State College of Ceramics, Alfred University, Alfred, NY 14802, USA
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30
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