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Christie JK. Review: understanding the properties of amorphous materials with high-performance computing methods. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2023; 381:20220251. [PMID: 37211037 DOI: 10.1098/rsta.2022.0251] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 03/20/2023] [Indexed: 05/23/2023]
Abstract
Amorphous materials have no long-range order in their atomic structure. This makes much of the formalism for the study of crystalline materials irrelevant, and so elucidating their structure and properties is challenging. The use of computational methods is a powerful complement to experimental studies, and in this paper we review the use of high-performance computing methods in the simulation of amorphous materials. Five case studies are presented to showcase the wide range of materials and computational methods available to practitioners in this field. This article is part of a discussion meeting issue 'Supercomputing simulations of advanced materials'.
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Affiliation(s)
- J K Christie
- Department of Materials, Loughborough University, Loughborough LE11 3TU, UK
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2
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Jabraoui H, Charpentier T, Gin S, Delaye JM, Pollet R. Behaviors of sodium and calcium ions at the borosilicate glass–water interface: Gaining new insights through an ab initio molecular dynamics study. J Chem Phys 2022; 156:134501. [DOI: 10.1063/5.0087390] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We study reactivity and leaching at the calcium sodium borosilicate (CNBS)–water interface by means of a Car–Parrinello ab initio molecular dynamics simulation over a simulation time of 100 ps. With an emphasis on the comparison between the behaviors of Ca2+ and Na+ cations at the CNBS glass–water interface, different mechanism events during the trajectory are revealed, discussed, and correlated with other density functional theory calculations. We show that Na+ ions can be released in solution, while Ca2+ cannot leave the surface of CNBS glass. This release is correlated with the vacancy energy of Ca2+ and Na+ cations. Here, we found that the CNBS structure with the Na+ cation vacancy is energetically more favorable than the structure with the Ca2+ cation vacancy. The calcium adsorption site has been shown to have a greater affinity for water than can be found in the case of the sodium site, demonstrating that affinity may not be considered a major factor controlling the release of cations from the glass to the solution.
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Affiliation(s)
- Hicham Jabraoui
- Université Paris-Saclay, CEA, CNRS, NIMBE, F-91191 Gif-sur-Yvette cedex, France
| | | | - Stéphane Gin
- CEA, DES, ISEC, DE2D, University of Montpellier, Marcoule, F-30207 Bagnols-sur-Ceze, France
| | - Jean-Marc Delaye
- CEA, DES, ISEC, DE2D, University of Montpellier, Marcoule, F-30207 Bagnols-sur-Ceze, France
| | - Rodolphe Pollet
- Université Paris-Saclay, CEA, CNRS, NIMBE, F-91191 Gif-sur-Yvette cedex, France
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3
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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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4
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Superparamagnetic and highly bioactive SPIONS/bioactive glass nanocomposite and its potential application in magnetic hyperthermia. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2022; 135:112655. [DOI: 10.1016/j.msec.2022.112655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 12/16/2021] [Accepted: 01/05/2022] [Indexed: 11/18/2022]
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5
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Ye W, Hao J, Gao C, Xu Q, Zhu M, Liao R. Molecular insights into the liquid-solid behaviour of hydrocarbon and ester insulating liquids with cellulose polymer insulation. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117986] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Jaimes ATC, Kirste G, de Pablos-Martín A, Selle S, de Souza E Silva JM, Massera J, Karpukhina N, Hill RG, Brauer DS. Nano-imaging confirms improved apatite precipitation for high phosphate/silicate ratio bioactive glasses. Sci Rep 2021; 11:19464. [PMID: 34593912 PMCID: PMC8484619 DOI: 10.1038/s41598-021-98863-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 08/18/2021] [Indexed: 11/21/2022] Open
Abstract
Bioactive glasses convert to a biomimetic apatite when in contact with physiological solutions; however, the number and type of phases precipitating depends on glass composition and reactivity. This process is typically followed by X-ray diffraction and infrared spectroscopy. Here, we visualise surface mineralisation in a series of sodium-free bioactive glasses, using transmission electron microscopy (TEM) with energy-dispersive X-ray spectroscopy (EDXS) and X-ray nano-computed tomography (nano-CT). In the glasses, the phosphate content was increased while adding stoichiometric amounts of calcium to maintain phosphate in an orthophosphate environment in the glass. Calcium fluoride was added to keep the melting temperature low. TEM brought to light the presence of phosphate clustering and nearly crystalline calcium fluoride environments in the glasses. A combination of analytical methods, including solid-state NMR, shows how with increasing phosphate content in the glass, precipitation of calcium fluoride during immersion is superseded by fluorapatite precipitation. Nano-CT gives insight into bioactive glass particle morphology after immersion, while TEM illustrates how compositional changes in the glass affect microstructure at a sub-micron to nanometre-level.
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Affiliation(s)
- Altair T Contreras Jaimes
- Otto Schott Institute of Materials Research, Friedrich Schiller University, Fraunhoferstr. 6, 07743, Jena, Germany
| | - Gloria Kirste
- Otto Schott Institute of Materials Research, Friedrich Schiller University, Fraunhoferstr. 6, 07743, Jena, Germany.,Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01069, Dresden, Germany
| | - Araceli de Pablos-Martín
- Otto Schott Institute of Materials Research, Friedrich Schiller University, Fraunhoferstr. 6, 07743, Jena, Germany. .,Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Walter-Hülse-Str. 1, 06120, Halle, Germany.
| | - Susanne Selle
- Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Walter-Hülse-Str. 1, 06120, Halle, Germany
| | - Juliana Martins de Souza E Silva
- Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Walter-Hülse-Str. 1, 06120, Halle, Germany.,Institute of Physics, Martin Luther University Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120, Halle, Germany
| | - Jonathan Massera
- Faculty of Medicine and Health Technology, Tampere University, Korkeakoulunkatu 3, 33720, Tampere, Finland
| | - Natalia Karpukhina
- Dental Physical Sciences, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
| | - Robert G Hill
- Dental Physical Sciences, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
| | - Delia S Brauer
- Otto Schott Institute of Materials Research, Friedrich Schiller University, Fraunhoferstr. 6, 07743, Jena, Germany.
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7
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Takada K, Tamura T, Maeda H, Kasuga T. Diffusion of protons and sodium ions in silicophosphate glasses: insight based on first-principles molecular dynamic simulations. Phys Chem Chem Phys 2021; 23:14580-14586. [PMID: 34160492 DOI: 10.1039/d1cp01646f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We propose a microscopic diffusion mechanism of protons and Na+ ions in phosphate glasses using first-principles molecular dynamic simulations. Protons hop and are chemisorbed onto non-bridging oxygen (NBO) of nearby PO4 tetrahedra through hydrogen bonds. The subsequent behavior depends on the morphology of the PO4 tetrahedra (QnP values). When a proton is adsorbed onto the NBO of a Q3P unit, it is desorbed on a short time scale of within 10 fs and re-adsorbed onto the NBO that was previously adsorbed. However, when a proton is adsorbed onto the NBO of a Q2P unit, another proton coordinated before adsorption is desorbed in a chain, resulting in the diffusion of protons. When a Na+ ion is present in the vicinity, the adsorption of a proton onto a Q2P unit leads to a decrease in the electrostatic interaction between Na+ and O- ions and induces the diffusion of Na+ ions. We conclude that the difference in the morphology of PO4 tetrahedra greatly affects the diffusion of protons and Na+ ions.
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Affiliation(s)
- Kazuya Takada
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Nagoya, 466-8555, Japan
| | - Tomoyuki Tamura
- Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya, 466-8555, Japan.
| | - Hirotaka Maeda
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Nagoya, 466-8555, Japan
| | - Toshihiro Kasuga
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Nagoya, 466-8555, Japan
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8
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Ren Z, Guo R, Bi H, Jia X, Xu M, Cai L. Interfacial Adhesion of Polylactic Acid on Cellulose Surface: A Molecular Dynamics Study. ACS APPLIED MATERIALS & INTERFACES 2020; 12:3236-3244. [PMID: 31869208 DOI: 10.1021/acsami.9b20101] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Interfacial bonding and adhesion mechanisms are important in determining the final properties of the polymer composite. Molecular dynamics (MD) simulations have been used to characterize the interfacial structure and adhesion behavior of crystalline cellulose planes in contact with polylactic acid. The structure of the PLA at the interface exhibits a shape that can accommodate the structure of the cellulose surface. The adhesion between the PLA and the cellulose surface is affected by the polarity of the functional groups and the surface roughness. The improved adhesion is primarily due to hydrogen bonds formed between the cellulose and PLA molecular chains. Cellulose planes with higher molecular protrusions and greater surface roughness produce stronger adhesion to PLA due to enhanced hydrogen bonding. This study provides a basic insight into the interfacial mechanisms of PLA and cellulose surfaces at the molecular level.
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Affiliation(s)
- Zechun Ren
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Rui Guo
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Hongjie Bi
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Xin Jia
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Min Xu
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Liping Cai
- Mechanical and Energy Engineer Department , University of North Texas , Demon , Texas 76201 , United States
- College of Materials Science and Engineering , Nanjing Forestry University , Nanjing 210037 , China
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9
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Lu X, Deng L, Huntley C, Ren M, Kuo PH, Thomas T, Chen J, Du J. Mixed Network Former Effect on Structure, Physical Properties, and Bioactivity of 45S5 Bioactive Glasses: An Integrated Experimental and Molecular Dynamics Simulation Study. J Phys Chem B 2018; 122:2564-2577. [DOI: 10.1021/acs.jpcb.7b12127] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaonan Lu
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, United States
| | - Lu Deng
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, United States
| | - Caitlin Huntley
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, United States
| | - Mengguo Ren
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, United States
| | - Po-Hsuen Kuo
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, United States
| | - Ty Thomas
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, United States
| | - Jonathan Chen
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, United States
| | - Jincheng Du
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, United States
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10
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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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11
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Stone-Weiss N, Pierce EM, Youngman RE, Gulbiten O, Smith NJ, Du J, Goel A. Understanding the structural drivers governing glass-water interactions in borosilicate based model bioactive glasses. Acta Biomater 2018; 65:436-449. [PMID: 29127067 DOI: 10.1016/j.actbio.2017.11.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 10/31/2017] [Accepted: 11/07/2017] [Indexed: 02/09/2023]
Abstract
The past decade has witnessed a significant upsurge in the development of borate and borosilicate based resorbable bioactive glasses owing to their faster degradation rate in comparison to their silicate counterparts. However, due to our lack of understanding about the fundamental science governing the aqueous corrosion of these glasses, most of the borate/borosilicate based bioactive glasses reported in the literature have been designed by "trial-and-error" approach. With an ever-increasing demand for their application in treating a broad spectrum of non-skeletal health problems, it is becoming increasingly difficult to design advanced glass formulations using the same conventional approach. Therefore, a paradigm shift from the "trial-and-error" approach to "materials-by-design" approach is required to develop new-generations of bioactive glasses with controlled release of functional ions tailored for specific patients and disease states, whereby material functions and properties can be predicted from first principles. Realizing this goal, however, requires a thorough understanding of the complex sequence of reactions that control the dissolution kinetics of bioactive glasses and the structural drivers that govern them. While there is a considerable amount of literature published on chemical dissolution behavior and apatite-forming ability of potentially bioactive glasses, the majority of this literature has been produced on silicate glass chemistries using different experimental and measurement protocols. It follows that inter-comparison of different datasets reveals inconsistencies between experimental groups. There are also some major experimental challenges or choices that need to be carefully navigated to unearth the mechanisms governing the chemical degradation behavior and kinetics of boron-containing bioactive glasses, and to accurately determine the composition-structure-property relationships. In order to address these challenges, a simplified borosilicate based model melt-quenched bioactive glass system has been studied to depict the impact of thermal history on its molecular structure and dissolution behavior in water. It has been shown that the methodology of quenching of the glass melt impacts the dissolution rate of the studied glasses by 1.5×-3× depending on the changes induced in their molecular structure due to variation in thermal history. Further, a recommendation has been made to study dissolution behavior of bioactive glasses using surface area of the sample - to - volume of solution (SA/V) approach instead of the currently followed mass of sample - to - volume of solution approach. The structural and chemical dissolution data obtained from bioactive glasses following the approach presented in this paper can be used to develop the structural descriptors and potential energy functions over a broad range of bioactive glass compositions. STATEMENT OF SIGNIFICANCE Realizing the goal of designing third generation bioactive glasses requires a thorough understanding of the complex sequence of reactions that control their rate of degradation (in physiological fluids) and the structural drivers that control them. In this article, we have highlighted some major experimental challenges and choices that need to be carefully navigated in order to unearth the mechanisms governing the chemical dissolution behavior of borosilicate based bioactive glasses. The proposed experimental approach allows us to gain a new level of conceptual understanding about the composition-structure-property relationships in these glass systems, which can be applied to attain a significant leap in designing borosilicate based bioactive glasses with controlled dissolution rates tailored for specific patient and disease states.
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12
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Mohamadi F, Ebrahimi-Barough S, Reza Nourani M, Ali Derakhshan M, Goodarzi V, Sadegh Nazockdast M, Farokhi M, Tajerian R, Faridi Majidi R, Ai J. Electrospun nerve guide scaffold of poly(ε-caprolactone)/collagen/nanobioglass: an in vitro
study in peripheral nerve tissue engineering. J Biomed Mater Res A 2017; 105:1960-1972. [DOI: 10.1002/jbm.a.36068] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 02/23/2017] [Accepted: 03/17/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Forouzan Mohamadi
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine; Tehran University of Medical Sciences; Tehran Iran
| | - Somayeh Ebrahimi-Barough
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine; Tehran University of Medical Sciences; Tehran Iran
| | - Mohammad Reza Nourani
- Nano Biotechnology Research Center, Baqiyatallah University of Medical Sciences; Tehran Iran
| | - Mohammad Ali Derakhshan
- Department of Medical Nanotechnology, School of Advanced Medical Sciences and Technologies; Shiraz University of Medical Sciences; Shiraz Iran
| | - Vahabodin Goodarzi
- Nano Biotechnology Research Center, Baqiyatallah University of Medical Sciences; Tehran Iran
| | | | - Mehdi Farokhi
- National Cell Bank of Iran, Pasteur Institute of Iran; Tehran Iran
| | - Roksana Tajerian
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine; Tehran University of Medical Sciences; Tehran Iran
| | - Reza Faridi Majidi
- Department of Nanomedicine, School of Advanced Medical Technologies; Tehran University of Medical Sciences; Tehran Iran
| | - Jafar Ai
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine; Tehran University of Medical Sciences; Tehran Iran
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13
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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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14
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Christie JK, Ainsworth RI, Hernandez SER, de Leeuw NH. Structures and properties of phosphate-based bioactive glasses from computer simulation: a review. J Mater Chem B 2017; 5:5297-5306. [DOI: 10.1039/c7tb01236e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Computer simulations have enabled breakthroughs in understanding the connections between the atomic structure and properties of bioactive phosphate glasses.
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Affiliation(s)
| | - Richard I. Ainsworth
- Department of Chemistry and Biochemistry
- University of California San Diego
- La Jolla 92093
- USA
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15
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Lowe BM, Maekawa Y, Shibuta Y, Sakata T, Skylaris CK, Green NG. Dynamic behaviour of the silica-water-bio electrical double layer in the presence of a divalent electrolyte. Phys Chem Chem Phys 2017; 19:2687-2701. [DOI: 10.1039/c6cp04101a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics simulation of the electric double layer at the silica-water-bio interface in mixed electrolyte. Water orientation and charge distribution showed a significant effect on the electrostatics at the interface.
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Affiliation(s)
- B. M. Lowe
- Institute for Complex Systems Simulation and the Electronics and Computer Science Department
- University of Southampton
- UK
| | - Y. Maekawa
- Department of Materials Engineering School of Engineering
- The University of Tokyo
- Tokyo 113-8656
- Japan
| | - Y. Shibuta
- Department of Materials Engineering School of Engineering
- The University of Tokyo
- Tokyo 113-8656
- Japan
| | - T. Sakata
- Department of Materials Engineering School of Engineering
- The University of Tokyo
- Tokyo 113-8656
- Japan
| | | | - N. G. Green
- Department of Electronics and Computer Science
- Nano Research Group
- University of Southampton
- UK
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16
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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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17
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Luo J, Banerjee J, Pantano CG, Kim SH. Vibrational Sum Frequency Generation Spectroscopy Study of Hydrous Species in Soda Lime Silica Float Glass. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6035-6045. [PMID: 27254814 DOI: 10.1021/acs.langmuir.6b00706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
It is generally accepted that the mechanical properties of soda lime silica (SLS) glass can be affected by the interaction between sodium ions and hydrous species (silanol groups and water molecules) in its surface region. While the amount of these hydrous species can be estimated from hydrogen profiles and infrared spectroscopy, their chemical environment in the glass network is still not well understood. This work employed vibrational sum frequency generation (SFG) spectroscopy to investigate the chemical environment of hydrous species in the surface region of SLS float glass. SLS float glass shows sharp peaks in the OH stretching vibration region in SFG spectra, while the OH stretch peaks of glasses that do not have leachable sodium ions and the OH peaks of water molecules in condensed phases are normally broad due to fast hydrogen bonding dynamics. The hydrous species responsible for the sharp SFG peaks for the SLS float glass were found to be thermodynamically more stable than physisorbed water molecules, did not exchange with D2O, and were associated with the sodium concentration gradient in the dealkalized subsurface region. These results suggested that the hydrous species reside in static solvation shells defined by the silicate network with relatively slow hydrogen bonding dynamics, compared to physisorbed water layers on top of the glass surface. A putative radial distribution of the hydrous species within the SLS glass network was estimated based on the OH SFG spectral features, which could be compared with theoretical distributions calculated from computational simulations.
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Affiliation(s)
- Jiawei Luo
- Department of Chemical Engineering, ‡Materials Research Institute, and §Department of Materials Science and Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Joy Banerjee
- Department of Chemical Engineering, ‡Materials Research Institute, and §Department of Materials Science and Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Carlo G Pantano
- Department of Chemical Engineering, ‡Materials Research Institute, and §Department of Materials Science and Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Seong H Kim
- Department of Chemical Engineering, ‡Materials Research Institute, and §Department of Materials Science and Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
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18
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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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Rimola A, Ugliengo P, Sodupe M. Strained ring motif at silica surfaces: A quantum mechanical study of their reactivity towards protic molecules. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.10.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Lowe BM, Skylaris CK, Green NG. Acid-base dissociation mechanisms and energetics at the silica-water interface: An activationless process. J Colloid Interface Sci 2015; 451:231-44. [PMID: 25898118 DOI: 10.1016/j.jcis.2015.01.094] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2014] [Revised: 01/23/2015] [Accepted: 01/26/2015] [Indexed: 10/23/2022]
Abstract
HYPOTHESIS Silanol groups at the silica-water interface determine not only the surface charge, but also have an important role in the binding of ions and biomolecules. As the pH is increased above pH 2, the silica surface develops a net negative charge primarily due to deprotonation of the silanol group. An improved understanding of the energetics and mechanisms of this fundamentally important process would further understanding of the relevant dynamics. SIMULATIONS Density Functional Theory ab initio molecular dynamics and geometry optimisations were used to investigate the mechanisms of surface neutralisation and charging in the presence of OH(-) and H3O(+) respectively. This charging mechanism has received little attention in the literature. FINDINGS The protonation or deprotonation of isolated silanols in the presence of H3O(+) or OH(-), respectively, was shown to be a highly rapid, exothermic reaction with no significant activation energy. This process occurred via a concerted motion of the protons through 'water wires'. Geometry optimisations of large water clusters at the silica surface demonstrated proton transfer to the surface occurring via the rarely discussed 'proton holes' mechanism. This indicates that surface protonation is possible even when the hydronium ion is distant (at least 4 water molecules separation) from the surface.
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Affiliation(s)
- Benjamin M Lowe
- Complex Systems Simulation and the Electronics and Computer Science Department, University of Southampton, UK.
| | | | - Nicolas G Green
- Department of Electronics and Computer Science, Nano Research Group, University of Southampton, UK.
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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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Laporte S, Finocchi F, Paulatto L, Blanchard M, Balan E, Guyot F, Saitta AM. Strong electric fields at a prototypical oxide/water interface probed by ab initio molecular dynamics: MgO(001). Phys Chem Chem Phys 2015; 17:20382-90. [DOI: 10.1039/c5cp02097b] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a density-functional theory (DFT)-based study of the interface of bulk water with a prototypical oxide surface, MgO(001), and focus our study on the often-overlooked surface electric field.
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Affiliation(s)
- Sara Laporte
- Sorbonne Universités
- Université Pierre et Marie Curie Paris 06
- CNRS
- Muséum National d'Histoire Naturelle
- IRD
| | - Fabio Finocchi
- Sorbonne Universités
- Université Pierre et Marie Curie Paris 06
- CNRS
- UMR 7588
- Institut des NanoSciences de Paris
| | - Lorenzo Paulatto
- Sorbonne Universités
- Université Pierre et Marie Curie Paris 06
- CNRS
- Muséum National d'Histoire Naturelle
- IRD
| | - Marc Blanchard
- Sorbonne Universités
- Université Pierre et Marie Curie Paris 06
- CNRS
- Muséum National d'Histoire Naturelle
- IRD
| | - Etienne Balan
- Sorbonne Universités
- Université Pierre et Marie Curie Paris 06
- CNRS
- Muséum National d'Histoire Naturelle
- IRD
| | - François Guyot
- Sorbonne Universités
- Université Pierre et Marie Curie Paris 06
- CNRS
- Muséum National d'Histoire Naturelle
- IRD
| | - Antonino Marco Saitta
- Sorbonne Universités
- Université Pierre et Marie Curie Paris 06
- CNRS
- Muséum National d'Histoire Naturelle
- IRD
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24
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Shaharyar Y, Wein E, Kim JJ, Youngman RE, Muñoz F, Kim HW, Tilocca A, Goel A. Structure-solubility relationships in fluoride-containing phosphate based bioactive glasses. J Mater Chem B 2015; 3:9360-9373. [DOI: 10.1039/c5tb01494h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structural role of fluoride on chemical dissolution behavior of bioactive phosphate glasses has been studied.
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Affiliation(s)
- Yaqoot Shaharyar
- Department of Materials Science and Engineering
- Rutgers
- The State University of New Jersey
- Piscataway
- USA
| | - Eric Wein
- Department of Materials Science and Engineering
- Rutgers
- The State University of New Jersey
- Piscataway
- USA
| | - Jung-Ju Kim
- Institute of Tissue Regeneration Engineering (ITREN)
- Dankook University
- Cheonan 330-714
- South Korea
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine
| | | | | | - Hae-Won Kim
- Institute of Tissue Regeneration Engineering (ITREN)
- Dankook University
- Cheonan 330-714
- South Korea
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine
| | - Antonio Tilocca
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
| | - Ashutosh Goel
- Department of Materials Science and Engineering
- Rutgers
- The State University of New Jersey
- Piscataway
- USA
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25
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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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26
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Cimas Á, Tielens F, Sulpizi M, Gaigeot MP, Costa D. The amorphous silica-liquid water interface studied by ab initio molecular dynamics (AIMD): local organization in global disorder. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:244106. [PMID: 24863440 DOI: 10.1088/0953-8984/26/24/244106] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The structural organization of water at a model of amorphous silica-liquid water interface is investigated by ab initio molecular dynamics (AIMD) simulations at room temperature. The amorphous surface is constructed with isolated, H-bonded vicinal and geminal silanols. In the absence of water, the silanols have orientations that depend on the local surface topology (i.e. presence of concave and convex zones). However, in the presence of liquid water, only the strong inter-silanol H-bonds are maintained, whereas the weaker ones are replaced by H-bonds formed with interfacial water molecules. All silanols are found to act as H-bond donors to water. The vicinal silanols are simultaneously found to be H-bond acceptors from water. The geminal pairs are also characterized by the formation of water H-bonded rings, which could provide special pathways for proton transfer(s) at the interface. The first water layer above the surface is overall rather disordered, with three main domains of orientations of the water molecules. We discuss the similarities and differences in the structural organization of the interfacial water layer at the surface of the amorphous silica and at the surface of the crystalline (0 0 0 1) quartz surface.
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Affiliation(s)
- Álvaro Cimas
- Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement, LAMBE UMR CNRS 8587, Université d'Evry val d'Essonne, Blvd F Mitterrand, Bat. Maupertuis, 91025 Evry, France
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27
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Hassanali AA, Cuny J, Verdolino V, Parrinello M. Aqueous solutions: state of the art in ab initio molecular dynamics. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2014; 372:20120482. [PMID: 24516179 DOI: 10.1098/rsta.2012.0482] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The simulation of liquids by ab initio molecular dynamics (AIMD) has been a subject of intense activity over the last two decades. The significant increase in computational resources as well as the development of new and efficient algorithms has elevated this method to the status of a standard quantum mechanical tool that is used by both experimentalists and theoreticians. As AIMD computes the electronic structure from first principles, it is free of ad hoc parametrizations and has thus been applied to a large variety of physical and chemical problems. In particular, AIMD has provided microscopic insight into the structural and dynamical properties of aqueous solutions which are often challenging to probe experimentally. In this review, after a brief theoretical description of the Born-Oppenheimer and Car-Parrinello molecular dynamics formalisms, we show how AIMD has enhanced our understanding of the properties of liquid water and its constituent ions: the proton and the hydroxide ion. Thereafter, a broad overview of the application of AIMD to other aqueous systems, such as solvated organic molecules and inorganic ions, is presented. We also briefly describe the latest theoretical developments made in AIMD, such as methods for enhanced sampling and the inclusion of nuclear quantum effects.
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Affiliation(s)
- Ali A Hassanali
- Department of Chemistry and Applied Biosciences, ETH Zurich and Università della Svizzera Italiana, , via G. Buffi 13, 6900 Lugano, Switzerland
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28
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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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29
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Murphy MB, Suzuki RK, Sand TT, Chaput CD, Gregory CA. Short Term Culture of Human Mesenchymal Stem Cells with Commercial Osteoconductive Carriers Provides Unique Insights into Biocompatibility. J Clin Med 2013; 2:49-66. [PMID: 26237062 PMCID: PMC4470228 DOI: 10.3390/jcm2030049] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 07/06/2013] [Accepted: 07/09/2013] [Indexed: 12/25/2022] Open
Abstract
For spinal fusions and the treatment of non-union fractures, biological substrates, scaffolds, or carriers often are applied as a graft to support regeneration of bone. The selection of an appropriate material critically influences cellular function and, ultimately, patient outcomes. Human bone marrow mesenchymal stem cells (BMSCs) are regarded as a critical component of bone healing. However, the interactions of BMSCs and commercial bone matrices are poorly reported. BMSCs were cultured with several commercially available bone substrates (allograft, demineralized bone matrix (DBM), collagen, and various forms of calcium phosphates) for 48 h to understand their response to graft materials during surgical preparation and the first days following implantation (cell retention, gene expression, pH). At 30 and 60 min, bone chips and inorganic substrates supported significantly more cell retention than other materials, while collagen-containing materials became soluble and lost their structure. At 48 h, cells bound to β-tricalcium phosphate-hydroxyapatite (βTCP-HA) and porous hydroxyapatite (HA) granules exhibited osteogenic gene expression statistically similar to bone chips. Through 24 h, the DBM strip and βTCP-collagen became mildly acidic (pH 7.1–7.3), while the DBM poloxamer-putties demonstrated acidity (pH < 5) and the bioglass-containing carrier became basic (pH > 10). The dissolution of DBM and collagen led to a loss of cells, while excessive pH changes potentially diminish cell viability and metabolism. Extracts from DBM-poloxamers induced osteogenic gene expression at 48 h. This study highlights the role that biochemical and structural properties of biomaterials play in cellular function, potentially enhancing or diminishing the efficacy of the overall therapy.
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Affiliation(s)
- Matthew B Murphy
- Department of Cellular Therapies, Celling Biosciences, Austin, Texas 78701, USA.
| | - Richard K Suzuki
- Department of Cellular Therapies, Celling Biosciences, Austin, Texas 78701, USA.
| | - Theodore T Sand
- Department of Cellular Therapies, Celling Biosciences, Austin, Texas 78701, USA.
| | | | - Carl A Gregory
- Institute for Regenerative Medicine, Scott and White Hospital, Texas A & M Health Science Center, Temple, TX 76502, USA.
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30
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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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31
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Abdollahi S, Ma ACC, Cerruti M. Surface transformations of Bioglass 45S5 during scaffold synthesis for bone tissue engineering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:1466-1474. [PMID: 23305513 DOI: 10.1021/la304647r] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In physiological fluid, a layer of hydroxycarbonate apatite, similar to bone mineral, develops on the surface of Bioglass 45S5. Collagen from the surrounding tissue is adsorbed on this layer that attracts osteoblasts, and favors bone regrowth. Bioglass is therefore an osteoinductive material. Still, due to its brittleness, the glass alone cannot be used to heal large bone defects. To overcome this issue, Bioglass is used to form a composite scaffold with poly(D,L-lactide) (PDLLA), a biodegradable polymer. The goal of this work is to understand Bioglass reactivity throughout scaffold fabrication via a low-temperature route, the solvent casting and particulate leaching technique. Changes in Bioglass (especially its surface) are susceptible to occur both while in contact with the processing fluids and potentially through a reaction with the surrounding polymeric matrix. Here we analyzed the surface changes of three different Bioglass samples: (i) as-received, (ii) treated in solutions that parallel those used in scaffold fabrication, and (iii) extracted from the scaffolds. We showed that extracted, just like treated, Bioglass deviates from the as-received, but to a larger extent. X-ray photoelectron and infrared spectroscopy support the theory that Bioglass surface was modified not just through contact with the solutions in scaffold fabrication, but upon an interaction with the polymeric matrix. The polymer network slows down the Na(+)/H(+) exchange between Bioglass and water used to leach salt particles to create pores within the scaffold. Changes in surface properties affect the bioactivity of Bioglass and thus of the composite scaffolds, and are therefore critical to identify.
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Affiliation(s)
- Sara Abdollahi
- Biointerface Laboratory, Department of Mining and Materials Engineering, McGill University, 3610 University Street, Montreal, Quebec H3A 2B2, Canada
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32
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Ainsworth RI, Tommaso DD, Christie JK, de Leeuw NH. Polarizable force field development and molecular dynamics study of phosphate-based glasses. J Chem Phys 2012; 137:234502. [DOI: 10.1063/1.4770295] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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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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34
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Cormack AN, Tilocca A. Structure and biological activity of glasses and ceramics. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2012; 370:1271-1280. [PMID: 22349242 DOI: 10.1098/rsta.2011.0371] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Biomaterials for repairing and regenerating parts of the human body play a key role in contemporary medicine, and have an increasing impact in modern society. Given the importance of orthopaedic medicine (bone is the second most replaced organ after blood), bioactive glasses and ceramics represent a key reference to guide technological advances in this field. Their established role in current biomedical applications has already led many research groups worldwide to look into their structural properties, with a view to identifying the molecular basis of their biological activity. As the efforts directed towards this crucial and exciting direction continue to increase, it is now timely to review the situation, in order to guide future investigations on structure-bioactivity relationships. In this introductory article, the field is reviewed, to provide an appropriate context for the contributions to this Theme Issue.
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Affiliation(s)
- A N Cormack
- New York State College of Ceramics, Alfred University, Alfred, NY 14802, USA.
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35
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Musso F, Mignon P, Ugliengo P, Sodupe M. Cooperative effects at water–crystalline silica interfaces strengthen surface silanol hydrogen bonding. An ab initio molecular dynamics study. Phys Chem Chem Phys 2012; 14:10507-14. [DOI: 10.1039/c2cp40756f] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Abstract
The molecular dynamics method is a powerful computer simulation technique which provides access to the detailed time evolution (trajectory) of a system in specified conditions, such as a particular temperature or pressure. The full trajectory of the system can be analyzed using statistical mechanics tools to obtain thermodynamical quantities and dynamical properties; the mechanism of chemical reactions and other time-dependent processes, such as diffusion, can also be revealed in high detail. When applied to model extended and complex system such as biomaterials, MD simulations represent an invaluable tool to discover structure-activity relationships and rationalize biomedical applications.
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Affiliation(s)
- Antonio Tilocca
- Department of Chemistry and Thomas Young Centre, University College London, London, UK.
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37
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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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Hassanali AA, Zhang H, Knight C, Shin YK, Singer SJ. The Dissociated Amorphous Silica Surface: Model Development and Evaluation. J Chem Theory Comput 2010; 6:3456-71. [DOI: 10.1021/ct100260z] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Ali A. Hassanali
- Biophysics Program, and Department of Chemistry, Ohio State University, Columbus, Ohio 43210, United States
| | - Hui Zhang
- Biophysics Program, and Department of Chemistry, Ohio State University, Columbus, Ohio 43210, United States
| | - Chris Knight
- Biophysics Program, and Department of Chemistry, Ohio State University, Columbus, Ohio 43210, United States
| | - Yun Kyung Shin
- Biophysics Program, and Department of Chemistry, Ohio State University, Columbus, Ohio 43210, United States
| | - Sherwin J. Singer
- Biophysics Program, and Department of Chemistry, Ohio State University, Columbus, Ohio 43210, United States
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Tilocca A. Sodium migration pathways in multicomponent silicate glasses: Car–Parrinello molecular dynamics simulations. J Chem Phys 2010; 133:014701. [DOI: 10.1063/1.3456712] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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41
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Tilocca A, Cormack AN. Surface signatures of bioactivity: MD simulations of 45S and 65S silicate glasses. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:545-51. [PMID: 19725567 DOI: 10.1021/la902548f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The surface of a bioactive (45S) and a bioinactive (65S) glass composition has been modeled using shell-model classical molecular dynamics simulations. Direct comparison of the two structures allowed us to identify the potential role of specific surface features in the processes leading to integration of a bioglass implant with the host tissues, focusing in particular on the initial dissolution of the glass network. The simulations highlight the critical role of network fragmentation and sodium enrichment of the surface in determining the rapid hydrolysis and release of silica fragments in solution, characteristic of highly bioactive compositions. On the other hand, no correlation has been found between the surface density of small (two- and three-membered) rings and bioactivity, thus suggesting that additional factors need to be taken into account to fully understand the role of these sites in the mechanism leading to calcium phosphate deposition on the glass surface.
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Affiliation(s)
- Antonio Tilocca
- Department of Chemistry, University College London, London, UK.
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42
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Corno M, Rimola A, Bolis V, Ugliengo P. Hydroxyapatite as a key biomaterial: quantum-mechanical simulation of its surfaces in interaction with biomolecules. Phys Chem Chem Phys 2010; 12:6309-29. [DOI: 10.1039/c002146f] [Citation(s) in RCA: 117] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Tilocca A. Models of structure, dynamics and reactivity of bioglasses: a review. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01081b] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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