51
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De Yoreo JJ, Nakouzi E, Jin B, Chun J, Mundy CJ. Assembly-based pathways of crystallization. Faraday Discuss 2022; 235:9-35. [DOI: 10.1039/d2fd00061j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Solution crystallization of materials ranging from simple salts to complex supramolecular assemblies has long been viewed through the lens of classical nucleation and growth theories in which monomeric building blocks...
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52
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Development of HANABI, an ultrasonication-forced amyloid fibril inducer. Neurochem Int 2021; 153:105270. [PMID: 34954259 DOI: 10.1016/j.neuint.2021.105270] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 12/16/2021] [Accepted: 12/21/2021] [Indexed: 12/20/2022]
Abstract
Amyloid fibrils involved in amyloidoses are crystal-like aggregates, which are formed by breaking supersaturation of denatured proteins. Ultrasonication is an efficient method of agitation for breaking supersaturation and thus inducing amyloid fibrils. By combining an ultrasonicator and a microplate reader, we developed the HANABI (HANdai Amyloid Burst Inducer) system that enables high-throughput analysis of amyloid fibril formation. Among high-throughput approaches of amyloid fibril assays, the HANABI system has advantages in accelerating and detecting spontaneous amyloid fibril formation. HANABI is also powerful for amplifying a tiny amount of preformed amyloid fibrils by seeding. Thus, HANABI will contribute to creating therapeutic strategies against amyloidoses by identifying their biomarkers.
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53
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Shi Q, Li F, Yeh S, Moinuddin SM, Xin J, Xu J, Chen H, Ling B. Recent Advances in Enhancement of Dissolution and Supersaturation of Poorly Water-Soluble Drug in Amorphous Pharmaceutical Solids: A Review. AAPS PharmSciTech 2021; 23:16. [PMID: 34893936 DOI: 10.1208/s12249-021-02137-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 09/07/2021] [Indexed: 12/19/2022] Open
Abstract
Amorphization is one of the most effective pharmaceutical approaches to enhance the dissolution and oral bioavailability of poorly water-soluble drugs. In recent years, amorphous formulations have been experiencing rapid development both in theoretical and practical application. Based on using different types of stabilizing agents, amorphous formulations can be mainly classified as polymer-based amorphous solid dispersion, coamorphous formulation, mesoporous silica-based amorphous formulation, etc. This paper summarizes recent advances in the dissolution and supersaturation of these amorphous formulations. Moreover, we also highlight the roles of stabilizing agents such as polymers, low molecular weight co-formers, and mesoporous silica. Maintaining supersaturation in solution is a key factor for the enhancement of dissolution profile and oral bioavailability, and thus, the strategies and challenges for maintaining supersaturation are also discussed. With an in-depth understanding of the inherent mechanisms of dissolution behaviors, the design of amorphous pharmaceutical formulations will become more scientific and reasonable, leading to vigorous development of commercial amorphous drug products.
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54
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Wu M, Jiang X, Meng Y, Niu Y, Yuan Z, Xiao W, Li X, Ruan X, Yan X, He G. High selective synthesis of CaCO3 superstructures via ultra-homoporous interfacial crystallizer. CHEMICAL ENGINEERING JOURNAL ADVANCES 2021. [DOI: 10.1016/j.ceja.2021.100179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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55
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Rampal N, Wang HW, Biriukov D, Brady AB, Neuefeind JC, Předota M, Stack AG. Local molecular environment drives speciation and reactivity of ion complexes in concentrated salt solution. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116898] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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56
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Lemke T, Edte M, Gebauer D, Peter C. Three Reasons Why Aspartic Acid and Glutamic Acid Sequences Have a Surprisingly Different Influence on Mineralization. J Phys Chem B 2021; 125:10335-10343. [PMID: 34473925 DOI: 10.1021/acs.jpcb.1c04467] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding the role of polymers rich in aspartic acid (Asp) and glutamic acid (Glu) is the key to gaining precise control over mineralization processes. Despite their chemical similarity, experiments revealed a surprisingly different influence of Asp and Glu sequences. We conducted molecular dynamics simulations of Asp and Glu peptides in the presence of calcium and chloride ions to elucidate the underlying phenomena. In line with experimental differences, in our simulations, we indeed find strong differences in the way the peptides interact with ions in solution. The investigated Asp pentapeptide tends to pull a lot of ions into its vicinity, and many structures with clusters of calcium and chloride ions on the surface of the peptide can be observed. Under the same conditions, comparatively fewer ions can be found in proximity of the investigated Glu pentapeptide, and the structures are characterized by single calcium ions bound to multiple carboxylate groups. Based on our simulation data, we identified three reasons contributing to these differences, leading to a new level of understanding additive-ion interactions.
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Affiliation(s)
- Tobias Lemke
- Theoretical Chemistry, University of Konstanz, 78547 Konstanz, Germany
| | - Moritz Edte
- Theoretical Chemistry, University of Konstanz, 78547 Konstanz, Germany
| | - Denis Gebauer
- Institute of Inorganic Chemistry, Leibniz University Hannover, 30167 Hannover, Germany
| | - Christine Peter
- Theoretical Chemistry, University of Konstanz, 78547 Konstanz, Germany
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57
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58
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Gránásy L, Rátkai L, Tóth GI, Gilbert PUPA, Zlotnikov I, Pusztai T. Phase-Field Modeling of Biomineralization in Mollusks and Corals: Microstructure vs Formation Mechanism. JACS AU 2021; 1:1014-1033. [PMID: 34337606 PMCID: PMC8317440 DOI: 10.1021/jacsau.1c00026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Indexed: 05/10/2023]
Abstract
While biological crystallization processes have been studied on the microscale extensively, there is a general lack of models addressing the mesoscale aspects of such phenomena. In this work, we investigate whether the phase-field theory developed in materials' science for describing complex polycrystalline structures on the mesoscale can be meaningfully adapted to model crystallization in biological systems. We demonstrate the abilities of the phase-field technique by modeling a range of microstructures observed in mollusk shells and coral skeletons, including granular, prismatic, sheet/columnar nacre, and sprinkled spherulitic structures. We also compare two possible micromechanisms of calcification: the classical route, via ion-by-ion addition from a fluid state, and a nonclassical route, crystallization of an amorphous precursor deposited at the solidification front. We show that with an appropriate choice of the model parameters, microstructures similar to those found in biomineralized systems can be obtained along both routes, though the time-scale of the nonclassical route appears to be more realistic. The resemblance of the simulated and natural biominerals suggests that, underneath the immense biological complexity observed in living organisms, the underlying design principles for biological structures may be understood with simple math and simulated by phase-field theory.
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Affiliation(s)
- László Gránásy
- Laboratory
of Advanced Structural Studies, Institute for Solid State Physics
and Optics, Wigner Research Centre for Physics, P.O. Box 49, H−1525 Budapest, Hungary
- Brunel
Centre of Advanced Solidification Technology, Brunel University, Uxbridge, Middlesex UB8 3PH, U.K.
| | - László Rátkai
- Laboratory
of Advanced Structural Studies, Institute for Solid State Physics
and Optics, Wigner Research Centre for Physics, P.O. Box 49, H−1525 Budapest, Hungary
| | - Gyula I. Tóth
- Department
of Mathematical Sciences, Loughborough University, Loughborough, Leicestershire LE11 3TU, U.K.
| | - Pupa U. P. A. Gilbert
- Departments
of Physics, Chemistry, Geoscience, Materials Science, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States
- Lawrence
Berkeley National Laboratory, Chemical Sciences Division, Berkeley, California 94720, United States
| | - Igor Zlotnikov
- B
CUBE−Center
for Molecular Bioengineering, Technische
Universität Dresden, 01307 Dresden, Germany
| | - Tamás Pusztai
- Laboratory
of Advanced Structural Studies, Institute for Solid State Physics
and Optics, Wigner Research Centre for Physics, P.O. Box 49, H−1525 Budapest, Hungary
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59
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Huang Y, Rao A, Huang S, Chang C, Drechsler M, Knaus J, Chan JCC, Raiteri P, Gale JD, Gebauer D. Aufdeckung der Rolle von Hydrogencarbonat‐Ionen bei der Bildung von Calciumcarbonat im nahezu neutralen pH‐Bereich. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yu‐Chieh Huang
- Fachbereich Chemie, Physikalische Chemie Universität Konstanz Deutschland
| | - Ashit Rao
- Physics of Complex Fluids Group and MESA+ Institute Faculty of Science and Technology University of Twente Enschede Niederlande
| | - Shing‐Jong Huang
- Department of Chemistry National Taiwan University Taipei Taiwan
| | - Chun‐Yu Chang
- Department of Chemistry National Taiwan University Taipei Taiwan
| | | | - Jennifer Knaus
- Fachbereich Chemie, Physikalische Chemie Universität Konstanz Deutschland
- stimOS GmbH Konstanz Deutschland
| | | | - Paolo Raiteri
- Curtin Institute for Computation/, The Institute for Geoscience Research (TIGeR) School of Molecular and Life Sciences Curtin University Perth Australien
| | - Julian D. Gale
- Curtin Institute for Computation/, The Institute for Geoscience Research (TIGeR) School of Molecular and Life Sciences Curtin University Perth Australien
| | - Denis Gebauer
- Institut für Anorganische Chemie Leibniz Universität Hannover Callinstraße 9 30167 Hannover Deutschland
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60
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Kelly DJ, Clark N, Zhou M, Gebauer D, Gorbachev RV, Haigh SJ. In Situ TEM Imaging of Solution-Phase Chemical Reactions Using 2D-Heterostructure Mixing Cells. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2100668. [PMID: 34105199 DOI: 10.1002/adma.202100668] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/31/2021] [Indexed: 06/12/2023]
Abstract
Liquid-phase transmission electron microscopy is used to study a wide range of chemical processes, where its unique combination of spatial and temporal resolution provides countless insights into nanoscale reaction dynamics. However, achieving sub-nanometer resolution has proved difficult due to limitations in the current liquid cell designs. Here, a novel experimental platform for in situ mixing using a specially developed 2D heterostructure-based liquid cell is presented. The technique facilitates in situ atomic resolution imaging and elemental analysis, with mixing achieved within the immediate viewing area via controllable nanofracture of an atomically thin separation membrane. This novel technique is used to investigate the time evolution of calcium carbonate synthesis, from the earliest stages of nanodroplet precursors to crystalline calcite in a single experiment. The observations provide the first direct visual confirmation of the recently developed liquid-liquid phase separation theory, while the technological advancements open an avenue for many other studies of early stage solution-phase reactions of great interest for both the exploration of fundamental science and developing applications.
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Affiliation(s)
- Daniel J Kelly
- Department of Materials and National Graphene Institute, University of Manchester, Manchester, M13 9PL, UK
| | - Nick Clark
- Department of Materials and National Graphene Institute, University of Manchester, Manchester, M13 9PL, UK
| | - Mingwei Zhou
- Department of Physics and Astronomy and National Graphene Institute, University of Manchester, Manchester, M13 9PL, UK
| | - Denis Gebauer
- Institute of Inorganic Chemistry, Leibniz Universität Hannover, Callinstr. 9, 30167, Hannover, Germany
| | - Roman V Gorbachev
- Department of Physics and Astronomy and National Graphene Institute, University of Manchester, Manchester, M13 9PL, UK
| | - Sarah J Haigh
- Department of Materials and National Graphene Institute, University of Manchester, Manchester, M13 9PL, UK
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61
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Eaton D, Saika-Voivod I, Bowles RK, Poole PH. Free energy surface of two-step nucleation. J Chem Phys 2021; 154:234507. [PMID: 34241260 DOI: 10.1063/5.0055877] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
We test the theoretical free energy surface (FES) for two-step nucleation (TSN) proposed by Iwamatsu [J. Chem. Phys. 134, 164508 (2011)] by comparing the predictions of the theory to numerical results for the FES recently reported from Monte Carlo simulations of TSN in a simple lattice system [James et al., J. Chem. Phys. 150, 074501 (2019)]. No adjustable parameters are used to make this comparison. That is, all the parameters of the theory are evaluated directly for the model system, yielding a predicted FES, which we then compare to the FES obtained from simulations. We find that the theoretical FES successfully predicts the numerically evaluated FES over a range of thermodynamic conditions that spans distinct regimes of behavior associated with TSN. All the qualitative features of the FES are captured by the theory, and the quantitative comparison is also very good. Our results demonstrate that Iwamatsu's extension of classical nucleation theory provides an excellent framework for understanding the thermodynamics of TSN.
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Affiliation(s)
- Dean Eaton
- Department of Physics, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada
| | - Ivan Saika-Voivod
- Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X7, Canada
| | - Richard K Bowles
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan 57N 5C9, Canada
| | - Peter H Poole
- Department of Physics, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada
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62
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Huang YC, Rao A, Huang SJ, Chang CY, Drechsler M, Knaus J, Chan JCC, Raiteri P, Gale JD, Gebauer D. Uncovering the Role of Bicarbonate in Calcium Carbonate Formation at Near-Neutral pH. Angew Chem Int Ed Engl 2021; 60:16707-16713. [PMID: 33973691 PMCID: PMC8362096 DOI: 10.1002/anie.202104002] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Indexed: 11/30/2022]
Abstract
Mechanistic pathways relevant to mineralization are not well‐understood fundamentally, let alone in the context of their biological and geological environments. Through quantitative analysis of ion association at near‐neutral pH, we identify the involvement of HCO3− ions in CaCO3 nucleation. Incorporation of HCO3− ions into the structure of amorphous intermediates is corroborated by solid‐state nuclear magnetic resonance spectroscopy, complemented by quantum mechanical calculations and molecular dynamics simulations. We identify the roles of HCO3− ions as being through (i) competition for ion association during the formation of ion pairs and ion clusters prior to nucleation and (ii) incorporation as a significant structural component of amorphous mineral particles. The roles of HCO3− ions as active soluble species and structural constituents in CaCO3 formation are of fundamental importance and provide a basis for a better understanding of physiological and geological mineralization.
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Affiliation(s)
- Yu-Chieh Huang
- Department of Chemistry, Physical Chemistry, University of Konstanz, Konstanz, Germany
| | - Ashit Rao
- Physics of Complex Fluids Group and MESA+ Institute, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
| | - Shing-Jong Huang
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Chun-Yu Chang
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | | | - Jennifer Knaus
- Department of Chemistry, Physical Chemistry, University of Konstanz, Konstanz, Germany.,stimOS GmbH, Konstanz, Germany
| | | | - Paolo Raiteri
- Curtin Institute for Computation/, The Institute for Geoscience Research (TIGeR), School of Molecular and Life Sciences, Curtin University, Perth, Australia
| | - Julian D Gale
- Curtin Institute for Computation/, The Institute for Geoscience Research (TIGeR), School of Molecular and Life Sciences, Curtin University, Perth, Australia
| | - Denis Gebauer
- Institute of Inorganic Chemistry, Leibniz University of Hannover, Callinstraße 9, 30167, Hannover, Germany
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63
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Kashin AS, Boiko DA, Ananikov VP. Neural Network Analysis of Electron Microscopy Video Data Reveals the Temperature-Driven Microphase Dynamics in the Ions/Water System. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2007726. [PMID: 33938144 DOI: 10.1002/smll.202007726] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 03/17/2021] [Indexed: 06/12/2023]
Abstract
Real-time field-emission scanning electron microscopy (FE-SEM) measurements and neural network analysis were successfully merged to observe the temperature-induced behavior of soft liquid microdomains in mixtures of different ionic liquids with water. The combination of liquid FE-SEM and in situ heating techniques revealed temperature-driven solution restructuring for ions/water systems with different water states and their critical point behavior expressed in a rapid switch between thermal expansion and shrinkage of liquid microphases at temperatures of ≈100-130 °C, which was directly recorded on electron microscopy videos. Automation of FE-SEM video analysis by a neural network approach allowed quantification of the morphological changes in ions/water systems during heating on the basis of thousands of images processed with a speed almost equal to the frame rate of original electron microscopy videos. Tracking and evolution of the micro-heterogeneous domains, hypothesized in the Ioliomics concept, was mapped and quantified for the first time. The present study describes the concept for quick acquisition of big data in electron microscopy, develops rapid neural network analysis and shows how to link microscopic data to fundamental molecular properties.
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Affiliation(s)
- Alexey S Kashin
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russian Federation
| | - Daniil A Boiko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russian Federation
| | - Valentine P Ananikov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russian Federation
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64
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Abstract
Aqueous cosolvent systems (ACoSs) are mixtures of small polar molecules such as amides, alcohols, dimethyl sulfoxide, or ions in water. These liquids have been the focus of fundamental studies due to their complex intermolecular interactions as well as their broad applications in chemistry, medicine, and materials science. ACoSs are fully miscible at the macroscopic level but exhibit nanometer-scale spatial heterogeneity. ACoSs have recently received renewed attention within the chemical physics community as model systems to explore the relationship between intermolecular interactions and microscopic liquid-liquid phase separation. In this perspective, we provide an overview of ACoS spatial segregation, dynamic heterogeneity, and multiscale relaxation dynamics. We describe emerging approaches to characterize liquid microstructure, H-bond networks, and dynamics using modern experimental tools combined with molecular dynamics simulations and network-based analysis techniques.
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Affiliation(s)
- Kwang-Im Oh
- Department of Chemistry, University of Texas at Austin, Austin, Texas 19104, USA
| | - Carlos R Baiz
- Department of Chemistry, University of Texas at Austin, Austin, Texas 19104, USA
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65
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Seepma SYMH, Ruiz-Hernandez SE, Nehrke G, Soetaert K, Philipse AP, Kuipers BWM, Wolthers M. Controlling CaCO 3 Particle Size with {Ca 2+}:{CO 3 2-} Ratios in Aqueous Environments. CRYSTAL GROWTH & DESIGN 2021; 21:1576-1590. [PMID: 33762898 PMCID: PMC7976603 DOI: 10.1021/acs.cgd.0c01403] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 01/19/2021] [Indexed: 06/12/2023]
Abstract
The effect of stoichiometry on the new formation and subsequent growth of CaCO3 was investigated over a large range of solution stoichiometries (10-4 < r aq < 104, where r aq = {Ca2+}:{CO3 2-}) at various, initially constant degrees of supersaturation (30 < Ωcal < 200, where Ωcal = {Ca2+}{CO3 2-}/K sp), pH of 10.5 ± 0.27, and ambient temperature and pressure. At r aq = 1 and Ωcal < 150, dynamic light scattering (DLS) showed that ion adsorption onto nuclei (1-10 nm) was the dominant mechanism. At higher supersaturation levels, no continuum of particle sizes is observed with time, suggesting aggregation of prenucleation clusters into larger particles as the dominant growth mechanism. At r aq ≠ 1 (Ωcal = 100), prenucleation particles remained smaller than 10 nm for up to 15 h. Cross-polarized light in optical light microscopy was used to measure the time needed for new particle formation and growth to at least 20 μm. This precipitation time depends strongly and asymmetrically on r aq. Complementary molecular dynamics (MD) simulations confirm that r aq affects CaCO3 nanoparticle formation substantially. At r aq = 1 and Ωcal ≫ 1000, the largest nanoparticle in the system had a 21-68% larger gyration radius after 20 ns of simulation time than in nonstoichiometric systems. Our results imply that, besides Ωcal, stoichiometry affects particle size, persistence, growth time, and ripening time toward micrometer-sized crystals. Our results may help us to improve the understanding, prediction, and formation of CaCO3 in geological, industrial, and geo-engineering settings.
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Affiliation(s)
- Sergěj Y. M. H. Seepma
- Department
of Earth Sciences, Utrecht University, Princetonlaan 8A, 3584 CB Utrecht, The Netherlands
| | - Sergio E. Ruiz-Hernandez
- Department
of Earth Sciences, Utrecht University, Princetonlaan 8A, 3584 CB Utrecht, The Netherlands
| | - Gernot Nehrke
- Alfred-Wegener
Institut: Helmholtz-Zentrum für Polar- und Meeresforschung, am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Karline Soetaert
- Department
of Earth Sciences, Utrecht University, Princetonlaan 8A, 3584 CB Utrecht, The Netherlands
- Estuarine
& Delta Systems Department, NIOZ: Royal
Netherlands Institute for Sea Research, Korringaweg 7, 4401
NT Yerseke, The Netherlands
| | - Albert P. Philipse
- Van‘t
Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute
for Nanomaterials Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Bonny W. M. Kuipers
- Van‘t
Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute
for Nanomaterials Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Mariette Wolthers
- Department
of Earth Sciences, Utrecht University, Princetonlaan 8A, 3584 CB Utrecht, The Netherlands
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66
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Sproncken CM, Magana JR, Voets IK. 100th Anniversary of Macromolecular Science Viewpoint: Attractive Soft Matter: Association Kinetics, Dynamics, and Pathway Complexity in Electrostatically Coassembled Micelles. ACS Macro Lett 2021; 10:167-179. [PMID: 33628618 PMCID: PMC7894791 DOI: 10.1021/acsmacrolett.0c00787] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 01/05/2021] [Indexed: 02/07/2023]
Abstract
Electrostatically coassembled micelles constitute a versatile class of functional soft materials with broad application potential as, for example, encapsulation agents for nanomedicine and nanoreactors for gels and inorganic particles. The nanostructures that form upon the mixing of selected oppositely charged (block co)polymers and other ionic species greatly depend on the chemical structure and physicochemical properties of the micellar building blocks, such as charge density, block length (ratio), and hydrophobicity. Nearly three decades of research since the introduction of this new class of polymer micelles shed significant light on the structure and properties of the steady-state association colloids. Dynamics and out-of-equilibrium processes, such as (dis)assembly pathways, exchange kinetics of the micellar constituents, and reaction-assembly networks, have steadily gained more attention. We foresee that the broadened scope will contribute toward the design and preparation of otherwise unattainable structures with emergent functionalities and properties. This Viewpoint focuses on current efforts to study such dynamic and out-of-equilibrium processes with greater spatiotemporal detail. We highlight different approaches and discuss how they reveal and rationalize similarities and differences in the behavior of mixed micelles prepared under various conditions and from different polymeric building blocks.
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Affiliation(s)
- Christian
C. M. Sproncken
- Laboratory of Self-Organizing
Soft Matter, Department of Chemical Engineering and Chemistry and
Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB, Eindhoven, The Netherlands
| | - J. Rodrigo Magana
- Laboratory of Self-Organizing
Soft Matter, Department of Chemical Engineering and Chemistry and
Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Ilja K. Voets
- Laboratory of Self-Organizing
Soft Matter, Department of Chemical Engineering and Chemistry and
Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB, Eindhoven, The Netherlands
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67
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Nonclassical Nucleation—Role of Metastable Intermediate Phase in Crystal Nucleation: An Editorial Prefix. CRYSTALS 2021. [DOI: 10.3390/cryst11020174] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Classical nucleation theory (CNT), which was established about 90 years ago, represents the most commonly used theory in describing nucleation processes. For a fluid-to-solid phase transition, CNT states that the solutes in a supersaturated solution reversibly form small clusters. Once a cluster reaches its critical size, it becomes thermodynamically stable and is favored for further growth. One of the most important assumptions of CNT is that the nucleation process is described by one reaction coordinate and all order parameters proceed simultaneously. Recent studies in experiments, computer simulations, and theory have revealed nonclassical features in the early stage of nucleation. In particular, the decoupling of order parameters involved during a fluid-to-solid transition leads to the so-called two-step nucleation mechanism, in which a metastable intermediate phase (MIP) exists in parallel to the initial supersaturated solution and the final crystals. These MIPs can be high-density liquid phases, mesoscopic clusters, or preordered states. In this Special Issue, we focus on the role of the various MIPs in the early stage of crystal nucleation of organic materials, metals and alloys, aqueous solutions, minerals, colloids, and proteins, and thus on various scenarios of nonclassical pathways of crystallization.
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68
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Lu H, Huang YC, Hunger J, Gebauer D, Cölfen H, Bonn M. Role of Water in CaCO 3 Biomineralization. J Am Chem Soc 2021; 143:1758-1762. [PMID: 33471507 PMCID: PMC7877725 DOI: 10.1021/jacs.0c11976] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Biomineralization occurs in aqueous
environments. Despite the ubiquity
and relevance of CaCO3 biomineralization, the role of water
in the biomineralization process has remained elusive. Here, we demonstrate
that water reorganization accompanies CaCO3 biomineralization
for sea urchin spine generation in a model system. Using surface-specific
vibrational spectroscopy, we probe the water at the interface of the
spine-associated protein during CaCO3 mineralization. Our
results show that, while the protein structure remains unchanged,
the structure of interfacial water is perturbed differently in the
presence of both Ca2+ and CO32– compared to the addition of only Ca2+. This difference
is attributed to the condensation of prenucleation mineral species.
Our findings are consistent with a nonclassical mineralization pathway
for sea urchin spine generation and highlight the importance of protein
hydration in biomineralization.
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Affiliation(s)
- Hao Lu
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Yu-Chieh Huang
- Physical Chemistry, Department of Chemistry, University of Konstanz, Universitätsstrasse 10, Konstanz 78464, Germany
| | - Johannes Hunger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Denis Gebauer
- Physical Chemistry, Department of Chemistry, University of Konstanz, Universitätsstrasse 10, Konstanz 78464, Germany.,Institute of Inorganic Chemistry, Leibniz University of Hannover, 30167 Hannover, Germany
| | - Helmut Cölfen
- Physical Chemistry, Department of Chemistry, University of Konstanz, Universitätsstrasse 10, Konstanz 78464, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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69
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Variation in Properties of Pre-Nucleation Calcium Carbonate Clusters Induced by Aggregation: A Molecular Dynamics Study. CRYSTALS 2021. [DOI: 10.3390/cryst11020102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Numerous studies have speculated calcium carbonate (CaCO3) nucleation induced by pre-nucleation clusters (PNCs) aggregation. However, it is challenging for experiments to directly obtain the relationship between PNCs aggregation and nucleation. Herein, we employ molecular dynamics simulations to explore the variation during PNCs aggregation, which can describe the beginning stage of CaCO3 nucleation induced by PNCs aggregation in supersaturated solutions. The results reveal that the formation of CaCO3 nucleus consists of PNCs spontaneous growth, PNCs solubility equilibrium, and aggregation of PNCs inducing nucleation. The PNCs aggregation, accompanied by the variation in the configuration and stability of CaCO3 aggregate, breaks the solubility equilibrium of PNCs and creates conditions for the formation of the more stable nucleus. Besides, the CaCO3 nucleus with the higher coordination number and the lower hydration number form when decreasing the CaCO3 concentration or increasing the temperature. This work not only sheds light on the formation of the CaCO3 nucleus but also contributes to the explanation for CaCO3 polymorphism.
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70
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Nakamuro T, Sakakibara M, Nada H, Harano K, Nakamura E. Capturing the Moment of Emergence of Crystal Nucleus from Disorder. J Am Chem Soc 2021; 143:1763-1767. [PMID: 33475359 DOI: 10.1021/jacs.0c12100] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Crystallization is the process of atoms or molecules forming an organized solid via nucleation and growth. Being intrinsically stochastic, the research at an atomistic level has been a huge experimental challenge. We report herein in situ detection of a crystal nucleus forming during nucleation/growth of a NaCl nanocrystal, as video recorded in the interior of a vibrating conical carbon nanotube at 20-40 ms frame-1 with localization precision of <0.1 nm. We saw NaCl units assembled to form a cluster fluctuating between featureless and semiordered states, which suddenly formed a crystal. Subsequent crystal growth at 298 K and shrinkage at 473 K took place also in a stochastic manner. Productive contributions of the graphitic surface and its mechanical vibration have been experimentally indicated.
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Affiliation(s)
- Takayuki Nakamuro
- Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masaya Sakakibara
- Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hiroki Nada
- Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba 305-8569, Japan
| | - Koji Harano
- Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Eiichi Nakamura
- Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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71
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Sharma V, Srinivasan A, Nikolajeff F, Kumar S. Biomineralization process in hard tissues: The interaction complexity within protein and inorganic counterparts. Acta Biomater 2021; 120:20-37. [PMID: 32413577 DOI: 10.1016/j.actbio.2020.04.049] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/17/2020] [Accepted: 04/26/2020] [Indexed: 02/07/2023]
Abstract
Biomineralization can be considered as nature's strategy to produce and sustain biominerals, primarily via creation of hard tissues for protection and support. This review examines the biomineralization process within the hard tissues of the human body with special emphasis on the mechanisms and principles of bone and teeth mineralization. We describe the detailed role of proteins and inorganic ions in mediating the mineralization process. Furthermore, we highlight the various available models for studying bone physiology and mineralization starting from the historical static cell line-based methods to the most advanced 3D culture systems, elucidating the pros and cons of each one of these methods. With respect to the mineralization process in teeth, enamel and dentin mineralization is discussed in detail. The key role of intrinsically disordered proteins in modulating the process of mineralization in enamel and dentine is given attention. Finally, nanotechnological interventions in the area of bone and teeth mineralization, diseases and tissue regeneration is also discussed. STATEMENT OF SIGNIFICANCE: This article provides an overview of the biomineralization process within hard tissues of the human body, which encompasses the detailed mechanism innvolved in the formation of structures like teeth and bone. Moreover, we have discussed various available models used for studying biomineralization and also explored the nanotechnological applications in the field of bone regeneration and dentistry.
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Affiliation(s)
- Vaibhav Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India.
| | | | | | - Saroj Kumar
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India.
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72
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Ma YX, Hoff SE, Huang XQ, Liu J, Wan QQ, Song Q, Gu JT, Heinz H, Tay FR, Niu LN. Involvement of prenucleation clusters in calcium phosphate mineralization of collagen. Acta Biomater 2021; 120:213-223. [PMID: 32711082 DOI: 10.1016/j.actbio.2020.07.038] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 07/15/2020] [Accepted: 07/17/2020] [Indexed: 11/18/2022]
Abstract
Involvement of thermodynamically-stable prenucleation clusters (PNCs) in the biomineralization of collagen has been speculated since their existence was reported in mineralization systems. It has been hypothesized that intrafibrillar mineralization proceeds via nucleation of inhibitor-stabilized intermediates produced by liquid-liquid separation (aka. polymer-induced liquid precursors; PILPs). Here, the contribution of PNCs and PILPs to calcium phosphate intrafibrillar mineralization of collagen was examined in a model with a semipermeable membrane that excludes nucleation inhibitor-stabilized PILPs from reaching the collagen fibrils, using cryogenic electron microscopy of reconstituted fibrils and conventional transmission electron microscopy of collagen sponges. Molecular dynamics simulation with the Interface force field (IFF) was used to confirm the existence of PILPs with amorphous calcium phosphate and elucidate details of the dynamics. Furthermore, intrafibrillar mineralization of single collagen fibrils was experimentally observed with unstabilized PNCs when anionic/cationic polyelectrolytes were used to establish Donnan equilibrium across the semipermeable membrane. Molecular dynamics simulation verified PNC formation within the collagen intrafibrillar gap zones at the atomic scale and explained the role of external PILPs. The PILPs decrease the interfibrillar water content and increase the interfibrillar ionic concentration. Nevertheless, intrafibrillar mineralization of collagen sponges with PNCs alone was inefficacious, being constrained by competition from extrafibrillar mineral precipitation. STATEMENT OF SIGNIFICANCE: Compared with conventional PILP-based intrafibrillar mineralization, mineralization of collagen fibrils using unstabilized PNCs is constrained by competition from extrafibrillar mineral deposition. The narrow window of opportunity for PNCs to produce intrafibrillar mineralization provides a plausible explanation for the feasibility of nucleation inhibitor-free intrafibrillar apatite assembly during reconstitution of type I collagen.
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Affiliation(s)
- Yu-Xuan Ma
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Samuel Edmund Hoff
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO, USA
| | - Xue-Qing Huang
- Department of Prosthodontics, Guanghua School and Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong, PR China
| | - Juan Liu
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO, USA
| | - Qian-Qian Wan
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Qun Song
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Jun-Ting Gu
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Hendrik Heinz
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO, USA.
| | - Franklin R Tay
- The Dental College of Georgia, Augusta University, Augusta, GA, USA.
| | - Li-Na Niu
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China; The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang, Hena, China.
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73
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Finney A, Salvalaglio M. Multiple Pathways in NaCl Homogeneous Crystal Nucleation. Faraday Discuss 2021; 235:56-80. [DOI: 10.1039/d1fd00089f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NaCl crystal nucleation from metastable solutions has long been considered to occur according to a single-step mechanism where the growth in the size and crystalline order of the emerging nuclei...
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74
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Gindele MB, Steingrube LV, Gebauer D. Generality of liquid precursor phases in gas diffusion-based calcium carbonate synthesis. CrystEngComm 2021. [DOI: 10.1039/d1ce00225b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We confirm the presence of liquid calcium carbonate precursor species in absence of additives in gas diffusion systems.
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Affiliation(s)
- Maxim B. Gindele
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstraße 9, D 30167 Hannover, Germany
| | - Luisa Vanessa Steingrube
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstraße 9, D 30167 Hannover, Germany
| | - Denis Gebauer
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstraße 9, D 30167 Hannover, Germany
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75
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Sun CY, Stifler CA, Chopdekar RV, Schmidt CA, Parida G, Schoeppler V, Fordyce BI, Brau JH, Mass T, Tambutté S, Gilbert PUPA. From particle attachment to space-filling coral skeletons. Proc Natl Acad Sci U S A 2020; 117:30159-30170. [PMID: 33188087 PMCID: PMC7720159 DOI: 10.1073/pnas.2012025117] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Reef-building corals and their aragonite (CaCO3) skeletons support entire reef ecosystems, yet their formation mechanism is poorly understood. Here we used synchrotron spectromicroscopy to observe the nanoscale mineralogy of fresh, forming skeletons from six species spanning all reef-forming coral morphologies: Branching, encrusting, massive, and table. In all species, hydrated and anhydrous amorphous calcium carbonate nanoparticles were precursors for skeletal growth, as previously observed in a single species. The amorphous precursors here were observed in tissue, between tissue and skeleton, and at growth fronts of the skeleton, within a low-density nano- or microporous layer varying in thickness from 7 to 20 µm. Brunauer-Emmett-Teller measurements, however, indicated that the mature skeletons at the microscale were space-filling, comparable to single crystals of geologic aragonite. Nanoparticles alone can never fill space completely, thus ion-by-ion filling must be invoked to fill interstitial pores. Such ion-by-ion diffusion and attachment may occur from the supersaturated calcifying fluid known to exist in corals, or from a dense liquid precursor, observed in synthetic systems but never in biogenic ones. Concomitant particle attachment and ion-by-ion filling was previously observed in synthetic calcite rhombohedra, but never in aragonite pseudohexagonal prisms, synthetic or biogenic, as observed here. Models for biomineral growth, isotope incorporation, and coral skeletons' resilience to ocean warming and acidification must take into account the dual formation mechanism, including particle attachment and ion-by-ion space filling.
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Affiliation(s)
- Chang-Yu Sun
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Cayla A Stifler
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Rajesh V Chopdekar
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Connor A Schmidt
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Ganesh Parida
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Vanessa Schoeppler
- B CUBE-Center for Molecular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
| | | | - Jack H Brau
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Tali Mass
- Marine Biology Department, University of Haifa, 31905 Haifa, Israel
| | - Sylvie Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 98000 Monaco, Principality of Monaco
| | - Pupa U P A Gilbert
- Department of Physics, University of Wisconsin, Madison, WI 53706;
- Department of Chemistry, University of Wisconsin, Madison, WI 53706
- Department of Geoscience, University of Wisconsin, Madison, WI 53706
- Department of Materials Science, University of Wisconsin, Madison, WI 53706
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76
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He K, Sawczyk M, Liu C, Yuan Y, Song B, Deivanayagam R, Nie A, Hu X, Dravid VP, Lu J, Sukotjo C, Lu YP, Král P, Shokuhfar T, Shahbazian-Yassar R. Revealing nanoscale mineralization pathways of hydroxyapatite using in situ liquid cell transmission electron microscopy. SCIENCE ADVANCES 2020; 6:eaaz7524. [PMID: 33208378 PMCID: PMC7673812 DOI: 10.1126/sciadv.aaz7524] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 10/06/2020] [Indexed: 05/19/2023]
Abstract
To treat impairments in hard tissues or overcome pathological calcification in soft tissues, a detailed understanding of mineralization pathways of calcium phosphate materials is needed. Here, we report a detailed mechanistic study of hydroxyapatite (HA) mineralization pathways in an artificial saliva solution via in situ liquid cell transmission electron microscopy (TEM). It is found that the mineralization of HA starts by forming ion-rich and ion-poor solutions in the saliva solution, followed by coexistence of the classical and nonclassical nucleation processes. For the nonclassical path, amorphous calcium phosphate (ACP) functions as the substrate for HA nucleation on the ACP surface, while the classical path features direct HA nucleation from the solution. The growth of HA crystals on the surface of ACP is accompanied by the ACP dissolution process. The discoveries reported in this work are important to understand the physiological and pathological formation of HA minerals, as well as to engineer the biomineralization process for bone healing and hard tissue repairs.
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Affiliation(s)
- Kun He
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA
- Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, Northwestern University, Evanston, IL 60208, USA
- School of Materials Science and Engineering, Shandong University, Ji'nan 250061, China
| | - Michal Sawczyk
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Cong Liu
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Yifei Yuan
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Boao Song
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Ram Deivanayagam
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Anmin Nie
- State Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Xiaobing Hu
- Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, Northwestern University, Evanston, IL 60208, USA
| | - Vinayak P Dravid
- Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, Northwestern University, Evanston, IL 60208, USA
| | - Jun Lu
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Cortino Sukotjo
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Yu-Peng Lu
- School of Materials Science and Engineering, Shandong University, Ji'nan 250061, China.
| | - Petr Král
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607, USA.
- Departments of Physics, Biopharmaceutical Sciences, and Chemical Engineering, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL 60607, USA
| | - Tolou Shokuhfar
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA.
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Reza Shahbazian-Yassar
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA.
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77
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Padmanabhan SC, Collins TW, Pillai SC, McCormack DE, Kelly JM, Holmes JD, Morris MA. A conceptual change in crystallisation mechanisms of oxide materials from solutions in closed systems. Sci Rep 2020; 10:18414. [PMID: 33110206 PMCID: PMC7592049 DOI: 10.1038/s41598-020-75241-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 09/28/2020] [Indexed: 11/09/2022] Open
Abstract
Atomic and molecular level interactions in solutions dictate the structural and functional attributes of crystals. These features clearly dictate the properties of materials and their applicability in technologies. However, the microscopic phenomena of particle formation-nucleation and growth-in real systems are still not fully understood. Specifically, crystallisation occurring in closed systems are largely unproven. Combining coherent experimental data, we here demonstrate a fundamental nucleation-growth mechanism that occurs in a model zinc oxide system when particles are formed under continuous, rapid heating under closed reaction conditions. Defying all previous reports, we show that the nucleation commences only when the heating is terminated. A prenucleation clusters pathway is observed for nucleation, followed by crystallite assembly-growth. We show that the nucleation-growth processes result from temporal and dynamic activity of constituent ions and gaseous molecules in solution and by the irreversible expulsion of the dissolved gaseous molecules. We suggest that this nucleation process is generic to most closed systems that go through precipitation, and, therefore, important for the crystallisation of a variety of metal oxides, composites and minerals. We anticipate that the work may be a platform for future experimental and theoretical investigation promoting deeper understanding of the nucleation-growth phenomena of a variety of practical systems.
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Affiliation(s)
- Sibu C Padmanabhan
- Advanced Materials and BioEngineering Research (AMBER) Centre, Trinity College Dublin, College Green, Dublin 2, Ireland. .,School of Chemistry, Trinity College Dublin, College Green, Dublin 2, Ireland. .,School of Chemistry, University College Cork, College Road, Cork, T12 YN60, Ireland.
| | - Timothy W Collins
- School of Chemistry, University College Cork, College Road, Cork, T12 YN60, Ireland
| | - Suresh C Pillai
- Centre for Precision Engineering, Materials and Manufacturing Research (PEM), Institute of Technology Sligo, Ash Lane, Sligo, F91 YW50, Ireland.,Nanotechnology and Bio-Engineering Research Group, Department of Environmental Science, Institute of Technology Sligo, Ash Lane, Sligo, F91 YW50, Ireland
| | - Declan E McCormack
- School of Chemical and Pharmaceutical Sciences, Technical University Dublin, City Campus, Kevin Street, Dublin 8, D02 HW71, Ireland
| | - John M Kelly
- School of Chemistry, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Justin D Holmes
- Advanced Materials and BioEngineering Research (AMBER) Centre, Trinity College Dublin, College Green, Dublin 2, Ireland.,School of Chemistry, Trinity College Dublin, College Green, Dublin 2, Ireland.,School of Chemistry, University College Cork, College Road, Cork, T12 YN60, Ireland
| | - Michael A Morris
- Advanced Materials and BioEngineering Research (AMBER) Centre, Trinity College Dublin, College Green, Dublin 2, Ireland. .,School of Chemistry, Trinity College Dublin, College Green, Dublin 2, Ireland.
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78
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Morris PD, McPherson IJ, Meloni GN, Unwin PR. Nanoscale kinetics of amorphous calcium carbonate precipitation in H 2O and D 2O. Phys Chem Chem Phys 2020; 22:22107-22115. [PMID: 32990693 DOI: 10.1039/d0cp03032e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Calcium carbonate (CaCO3) is one of the most well-studied and abundant natural materials on Earth. Crystallisation of CaCO3 is often observed to proceed via an amorphous calcium carbonate (ACC) phase, as a precursor to more stable crystalline polymorphs such as vaterite and calcite. Despite its importance, the kinetics of ACC formation have proved difficult to study, in part due to rapid precipitation at moderate supersaturations, and the instability of ACC with respect to all other polymorphs. However, ACC can be stabilised under confinement conditions, such as those provided by a nanopipette. This paper demonstrates electrochemical mixing of a Ca2+ salt (CaCl2) and a HCO3- salt (NaHCO3) in a nanopipette to repeatedly and reversibly precipitate nanoparticles of ACC under confined conditions, as confirmed by scanning transmission electron microscopy (STEM). Measuring the current as a function of applied potential across the end of the nanopipette and time provides millisecond-resolved measurements of the induction time for ACC precipitation. We demonstrate that under conditions of electrochemical mixing, ACC precipitation is extremely fast, and highly pH sensitive with an apparent third order dependence on CO32- concentration. Furthermore, the rate is very similar for the equivalent CO32- concentrations in D2O, suggesting that neither ion dehydration nor HCO3- deprotonation represent significant energetic barriers to the formation of ACC. Finite element method simulations of the electrochemical mixing process enable the supersaturation to be estimated for all conditions and accurately predict the location of precipitation.
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Affiliation(s)
- Peter D Morris
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK.
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79
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Choi S, Parameswaran S, Choi JH. Understanding alcohol aggregates and the water hydrogen bond network towards miscibility in alcohol solutions: graph theoretical analysis. Phys Chem Chem Phys 2020; 22:17181-17195. [PMID: 32677643 DOI: 10.1039/d0cp01991g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Under ambient conditions, methanol and ethanol are miscible in water at all concentrations, while n-butanol is partially miscible. This is the first study to quantitatively examine the miscibility of butanol and compare with miscible alcohols by employing molecular dynamics simulations and graph theoretical analysis of three water-alcohol mixtures at various concentrations. We show how distinct alcohol aggregates are formed, thereby affecting the water structure, which established the relationship between the morphological structure of the aggregates and the miscibility of the alcohol in aqueous solution. The aggregates of methanol and ethanol in highly concentrated solutions form an extended H-bond network that intertwines well with the H-bond network of water. n-Butanol tends to self-associate and form large aggregates, while such aggregates are segregated from water. Graph theoretical analysis revealed that the alcohol aggregates of methanol and ethanol solutions have a morphological structure different from that of n-butanol, although there is no significant difference in morphology between the three pure alcohols. These two distinct alcohol aggregates are classified as water-compatible and water-incompatible depending upon their interaction with the water H-bond network, and their effect on the water structure was investigated. Our study reveals that the water-compatible network of alcohol aggregates in methanol and ethanol solutions disrupts the water H-bond networks, while the water-incompatible network of n-butanol aggregates does not considerably alter the water structure, which is consistent with the experimental results. Furthermore, we propose that miscible alcohols form water-compatible networks in binary aqueous systems while partially miscible alcohols form water-incompatible networks. The bifurcating hypothesis on the alcohol aggregation behavior in liquid water is of critical use to understand the fundamental issues such as solubility and phase separation in solution systems.
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Affiliation(s)
- Seungeui Choi
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
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80
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Meldrum FC, O'Shaughnessy C. Crystallization in Confinement. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2001068. [PMID: 32583495 DOI: 10.1002/adma.202001068] [Citation(s) in RCA: 90] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 03/26/2020] [Accepted: 03/27/2020] [Indexed: 05/23/2023]
Abstract
Many crystallization processes of great importance, including frost heave, biomineralization, the synthesis of nanomaterials, and scale formation, occur in small volumes rather than bulk solution. Here, the influence of confinement on crystallization processes is described, drawing together information from fields as diverse as bioinspired mineralization, templating, pharmaceuticals, colloidal crystallization, and geochemistry. Experiments are principally conducted within confining systems that offer well-defined environments, varying from droplets in microfluidic devices, to cylindrical pores in filtration membranes, to nanoporous glasses and carbon nanotubes. Dramatic effects are observed, including a stabilization of metastable polymorphs, a depression of freezing points, and the formation of crystals with preferred orientations, modified morphologies, and even structures not seen in bulk. Confinement is also shown to influence crystallization processes over length scales ranging from the atomic to hundreds of micrometers, and to originate from a wide range of mechanisms. The development of an enhanced understanding of the influence of confinement on crystal nucleation and growth will not only provide superior insight into crystallization processes in many real-world environments, but will also enable this phenomenon to be used to control crystallization in applications including nanomaterial synthesis, heavy metal remediation, and the prevention of weathering.
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Affiliation(s)
- Fiona C Meldrum
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
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81
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Baumgartner J, Ramamoorthy RK, Freitas AP, Neouze MA, Bennet M, Faivre D, Carriere D. Self-Confined Nucleation of Iron Oxide Nanoparticles in a Nanostructured Amorphous Precursor. NANO LETTERS 2020; 20:5001-5007. [PMID: 32551668 DOI: 10.1021/acs.nanolett.0c01125] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Crystallization from solution is commonly described by classical nucleation theory, although this ignores that crystals often form via disordered nanostructures. As an alternative, the classical theory remains widely used in a "multistep" variant, where the intermediate nanostructures merely introduce additional thermodynamic parameters. However, this variant still requires validation by experiments addressing indeed proper time and spatial scales (millisecond, nanometer). Here, we used in situ X-ray scattering to determine the mechanism of magnetite crystallization and, in particular, how nucleation propagates at the nanometer scale within amorphous precursors. We find that the self-confinement by an amorphous precursor slows down crystal growth by 2 orders of magnitude once the crystal size reaches the amorphous particle size (∼3 nm). Thus, not only the thermodynamic properties of transient amorphous nanostructures but also their spatial distribution determine crystal nucleation.
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Affiliation(s)
- Jens Baumgartner
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
| | - Raj Kumar Ramamoorthy
- Université Paris-Saclay, CNRS, CEA, NIMBE, LIONS, CEA Saclay, 91191 Cedex Gif sur Yvette, France
| | - Alexy P Freitas
- Université Paris-Saclay, CNRS, CEA, NIMBE, LIONS, CEA Saclay, 91191 Cedex Gif sur Yvette, France
- Laboratoire de Physique de la Matière Condensée, École Polytechnique, CNRS, Université Paris-Saclay, 91128 Palaiseau, France
| | - Marie-Alexandra Neouze
- Laboratoire de Physique de la Matière Condensée, École Polytechnique, CNRS, Université Paris-Saclay, 91128 Palaiseau, France
| | - Mathieu Bennet
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
| | - Damien Faivre
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
- Aix-Marseille Université, CEA, CNRS, BIAM, 13108 Saint Paul lez Durance, France
| | - David Carriere
- Université Paris-Saclay, CNRS, CEA, NIMBE, LIONS, CEA Saclay, 91191 Cedex Gif sur Yvette, France
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82
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Finney AR, Innocenti Malini R, Freeman CL, Harding JH. Amino Acid and Oligopeptide Effects on Calcium Carbonate Solutions. CRYSTAL GROWTH & DESIGN 2020; 20:3077-3092. [PMID: 32581657 PMCID: PMC7304842 DOI: 10.1021/acs.cgd.9b01693] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 04/08/2020] [Indexed: 05/04/2023]
Abstract
Biological organisms display sophisticated control of nucleation and crystallization of minerals. In order to mimic living systems, deciphering the mechanisms by which organic molecules control the formation of mineral phases from solution is a key step. We have used computer simulations to investigate the effects of the amino acids arginine, aspartic acid, and glycine on species that form in solutions of calcium carbonate (CaCO3) at lower and higher levels of supersaturation. This provides net positive, negative, and neutral additives. In addition, we have prepared simulations containing hexapeptides of the amino acids to consider the effect of additive size on the solution species. We find that additives have limited impact on the formation of extended, liquid-like CaCO3 networks in supersaturated solutions. Additives control the amount of (bi)carbonate in solution, but more importantly, they are able to stabilize these networks on the time scales of the simulations. This is achieved by coordinating the networks and assembled additive clusters in solutions. The association leads to subtle changes in the coordination of CaCO3 and reduced mobility of the cations. We find that the number of solute association sites and the size and topology of the additives are more important than their net charge. Our results help to understand why polymer additives are so effective at stabilizing dense liquid CaCO3 phases.
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Affiliation(s)
- Aaron R. Finney
- Department
of Materials Science and Engineering, University
of Sheffield, Sheffield S1 3JD, United Kingdom
- Department
of Chemical Engineering, University College
London, London WC1E 6BT, United Kingdom
- E-mail:
| | - Riccardo Innocenti Malini
- Laboratory
for Biomimetic Membranes and Textiles, EMPA,
Swiss Federal Laboratories for Materials Science and Technology, St. Gallen 9014, Switzerland
| | - Colin L. Freeman
- Department
of Materials Science and Engineering, University
of Sheffield, Sheffield S1 3JD, United Kingdom
| | - John H. Harding
- Department
of Materials Science and Engineering, University
of Sheffield, Sheffield S1 3JD, United Kingdom
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83
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Rengifo RF, Sementilli A, Kim Y, Liang C, Li NX, Mehta AK, Lynn DG. Liquid‐Like Phases Preorder Peptides for Supramolecular Assembly. CHEMSYSTEMSCHEM 2020. [DOI: 10.1002/syst.202000007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Rolando F. Rengifo
- Chemistry Department Emory University 1515 Dickey Drive Atlanta GA 30322
| | - Anthony Sementilli
- Chemistry Department Emory University 1515 Dickey Drive Atlanta GA 30322
| | - Youngsun Kim
- Chemistry Department Emory University 1515 Dickey Drive Atlanta GA 30322
| | - Chen Liang
- Chemistry Department Emory University 1515 Dickey Drive Atlanta GA 30322
| | - Noel Xiang'An Li
- Chemistry Department Emory University 1515 Dickey Drive Atlanta GA 30322
| | - Anil K. Mehta
- Chemistry Department Emory University 1515 Dickey Drive Atlanta GA 30322
| | - David G. Lynn
- Chemistry Department Emory University 1515 Dickey Drive Atlanta GA 30322
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84
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Raiteri P, Schuitemaker A, Gale JD. Ion Pairing and Multiple Ion Binding in Calcium Carbonate Solutions Based on a Polarizable AMOEBA Force Field and Ab Initio Molecular Dynamics. J Phys Chem B 2020; 124:3568-3582. [PMID: 32259444 DOI: 10.1021/acs.jpcb.0c01582] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The speciation of calcium carbonate in water is important to the geochemistry of the world's oceans and has ignited significant debate regarding the mechanism by which nucleation occurs. Here, it is vital to be able to quantify the thermodynamics of ion pairing versus higher order association processes in order to distinguish between possible pathways. Given that it is experimentally challenging to quantify such species, here we determine the thermodynamics for ion pairing and multiple binding of calcium carbonate species using bias-enhanced molecular dynamics. In order to examine the uncertainties underlying these results, we derived a new polarizable force field for both calcium carbonate and bicarbonate in water based on the AMOEBA model to compare against our earlier rigid ion model, both of which are further benchmarked against ab initio molecular dynamics for the ion pair. Both force fields consistently indicate that the association of calcium carbonate ion pairs to form larger species is stable, though with an equilibrium constant that is lower than for ion pairing itself.
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Affiliation(s)
- Paolo Raiteri
- Curtin Institute for Computation/The Institute for Geoscience Research (TIGeR), School of Molecular and Life Sciences, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia
| | - Alicia Schuitemaker
- Curtin Institute for Computation/The Institute for Geoscience Research (TIGeR), School of Molecular and Life Sciences, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia
| | - Julian D Gale
- Curtin Institute for Computation/The Institute for Geoscience Research (TIGeR), School of Molecular and Life Sciences, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia
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85
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Avaro JT, Wolf SLP, Hauser K, Gebauer D. Stable Prenucleation Calcium Carbonate Clusters Define Liquid-Liquid Phase Separation. Angew Chem Int Ed Engl 2020; 59:6155-6159. [PMID: 31943581 PMCID: PMC7187218 DOI: 10.1002/anie.201915350] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 01/07/2020] [Indexed: 01/25/2023]
Abstract
Liquid-liquid phase separation (LLPS) is an intermediate step during the precipitation of calcium carbonate, and is assumed to play a key role in biomineralization processes. Here, we have developed a model where ion association thermodynamics in homogeneous phases determine the liquid-liquid miscibility gap of the aqueous calcium carbonate system, verified experimentally using potentiometric titrations, and kinetic studies based on stopped-flow ATR-FTIR spectroscopy. The proposed mechanism explains the variable solubilities of solid amorphous calcium carbonates, reconciling previously inconsistent literature values. Accounting for liquid-liquid amorphous polymorphism, the model also provides clues to the mechanism of polymorph selection. It is general and should be tested for systems other than calcium carbonate to provide a new perspective on the physical chemistry of LLPS mechanisms based on stable prenucleation clusters rather than un-/metastable fluctuations in biomineralization, and beyond.
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Affiliation(s)
- Jonathan T. Avaro
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078457KonstanzGermany
| | - Stefan L. P. Wolf
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078457KonstanzGermany
| | - Karin Hauser
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078457KonstanzGermany
| | - Denis Gebauer
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078457KonstanzGermany
- Present address: Institute of Inorganic ChemistryLeibniz University of HannoverCallinstrasse 930167HannoverGermany
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86
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Lukić MJ, Gebauer D, Rose A. Nonclassical nucleation towards separation and recycling science: Iron and aluminium (Oxy)(hydr)oxides. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2020.03.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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87
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88
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Transformation of siderite to goethite by humic acid in the natural environment. Commun Chem 2020; 3:38. [PMID: 36703449 PMCID: PMC9814924 DOI: 10.1038/s42004-020-0284-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 03/03/2020] [Indexed: 01/29/2023] Open
Abstract
Humic acid (HA) is particularly important in iron-bearing mineral transformations and erosion at the water-mineral boundary zone of the Earth. In this study, three stages of the possible pathway by which HA causes mineral transformation from siderite to goethite are identified. Firstly, a Fe(II)-HA complex is formed by chelation, which accelerates the dissolution and oxidation of Fe(II) from the surface of siderite. As the Fe(II)-HA complex retains Fe atoms in close proximity of each other, ferrihydrite is formed by the agglomeration and crystallization. Finally, the ferrihydrite structurally rearranges upon attachment to the surface of goethite crystals and merges with its structure. The influence of low concentrations of HA (0-2 mg/L) on phosphate adsorption is found to be beneficial by the inducing of new mineral phases. We believe that these results provide a greater understanding of the impact of HA in the biogeochemical cycle of phosphate, mineral transformation.
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89
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Avaro JT, Wolf SLP, Hauser K, Gebauer D. Stabile Calciumcarbonat‐Pränukleationscluster bestimmen die Flüssig‐flüssig‐Phasenseparation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201915350] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Jonathan T. Avaro
- Fachbereich ChemieUniversität Konstanz Universitätsstraße 10 78457 Konstanz Deutschland
| | - Stefan L. P. Wolf
- Fachbereich ChemieUniversität Konstanz Universitätsstraße 10 78457 Konstanz Deutschland
| | - Karin Hauser
- Fachbereich ChemieUniversität Konstanz Universitätsstraße 10 78457 Konstanz Deutschland
| | - Denis Gebauer
- Fachbereich ChemieUniversität Konstanz Universitätsstraße 10 78457 Konstanz Deutschland
- Derzeitige Adresse: Institut für Anorganische ChemieLeibniz Universität Hannover Callinstraße 9 30167 Hannover Deutschland
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90
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Shi W, Ma Z, Mu Y, Wang J, Liu X, Dong Z, Wang S, Bai M, Teng Z. Interfacial self-propagation of oleophilic vaterite in crude oil emulsion and its application for reinforcing polyethylene. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.01.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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91
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Moinuddin SM, Shi Q, Tao J, Guo M, Zhang J, Xue Q, Ruan S, Cai T. Enhanced Physical Stability and Synchronized Release of Febuxostat and Indomethacin in Coamorphous Solids. AAPS PharmSciTech 2020; 21:41. [PMID: 31898765 DOI: 10.1208/s12249-019-1578-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 11/12/2019] [Indexed: 11/30/2022] Open
Abstract
Coamorphous formulation, a homogeneous monophasic amorphous system composed of multiple components, has been demonstrated as an effective approach for delivering drugs with poor aqueous solubility. In this study, we prepared the coamorphous system composed of two poorly soluble drugs febuxostat (FEB) and indomethacin (IMC) by using cryogenic milling. The combination of these two drugs in the coamorphous form can attain a synergistic effect, especially on gout therapy. Coamorphous solid of FEB and IMC in 1:1 molar ratio exhibited superior physical stability compared with the individual amorphous components, as evidenced by X-ray powder diffractions after 30 days of storage at ambient and elevated temperature. In addition, the FEB-IMC coamorphous system has been demonstrated to show enhanced dissolution performance. The intrinsic dissolution rates of two components in the coamorphous system exhibited the synchronized drug release. Based on the FT-IR spectroscopy, the excellent physical stability and synchronized release of FEB-IMC coamorphous system could be attributed to the heterodimer structure formed by strong hydrogen bonding interactions between these drugs. Furthermore, the supersaturation potential of FEB-IMC coamorphous solids was also investigated through the cosolvent quenching method. The FEB-IMC coamorphous system can effectively inhibit the fast crystallization of FEB in the supersaturated solution. However, the maximum achievable supersaturation of IMC in the coamorphous system decreases to only one fifth of that achieved for the pure amorphous IMC. These results are relevant for understanding the physical stability and complex solution behaviors of the coamorphous formulation.
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92
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Guo J, Wang Z, Cao J, Gong X. Structures of solvated tetramethylammonium aluminate species and its transformation mechanism by DFT and Raman spectra. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.07.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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93
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Abstract
This work provides a clearer picture for non-classical nucleation by revealing the presence of various intermediates using advanced characterization techniques.
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Affiliation(s)
- Biao Jin
- Physical Sciences Division
- Pacific Northwest National Laboratory
- Richland
- USA
- Department of Chemistry
| | - Zhaoming Liu
- Department of Chemistry
- Zhejiang University
- Hangzhou
- China
| | - Ruikang Tang
- Department of Chemistry
- Zhejiang University
- Hangzhou
- China
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94
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Affiliation(s)
- Peter G. Vekilov
- Department of Chemical and Biomolecular Engineering and Department of Chemistry, University of Houston, Houston, Texas 77204, United States
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95
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Li X, Schmidt JR. Modeling the Nucleation of Weak Electrolytes via Hybrid GCMC/MD Simulation. J Chem Theory Comput 2019; 15:5883-5893. [DOI: 10.1021/acs.jctc.9b00743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xinyi Li
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - J. R. Schmidt
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
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96
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Affiliation(s)
- Huachuan Du
- Soft Materials LaboratoryInstitute of MaterialsEcole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Schweiz
| | - Esther Amstad
- Soft Materials LaboratoryInstitute of MaterialsEcole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Schweiz
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97
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Du H, Amstad E. Water: How Does It Influence the CaCO 3 Formation? Angew Chem Int Ed Engl 2019; 59:1798-1816. [PMID: 31081984 DOI: 10.1002/anie.201903662] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Indexed: 11/11/2022]
Abstract
Nature produces biomineral-based materials with a fascinating set of properties using only a limited number of elements. This set of properties is obtained by closely controlling the structure and local composition of the biominerals. We are far from achieving the same degree of control over the properties of synthetic biomineral-based composites. One reason for this inferior control is our incomplete understanding of the influence of the synthesis conditions and additives on the structure and composition of the forming biominerals. In this Review, we provide an overview of the current understanding of the influence of synthesis conditions and additives during different formation stages of CaCO3 , one of the most abundant biominerals, on the structure, composition, and properties of the resulting CaCO3 crystals. In addition, we summarize currently known means to tune these parameters. Throughout the Review, we put special emphasis on the role of water in mediating the formation of CaCO3 and thereby influencing its structure and properties, an often overlooked aspect that is of high relevance.
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Affiliation(s)
- Huachuan Du
- Soft Materials Laboratory, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Esther Amstad
- Soft Materials Laboratory, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
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98
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Garcia N, Malini RI, Freeman CL, Demichelis R, Raiteri P, Sommerdijk NAJM, Harding JH, Gale JD. Simulation of Calcium Phosphate Prenucleation Clusters in Aqueous Solution: Association beyond Ion Pairing. CRYSTAL GROWTH & DESIGN 2019; 19:6422-6430. [PMID: 32063806 PMCID: PMC7011744 DOI: 10.1021/acs.cgd.9b00889] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 09/01/2019] [Indexed: 05/12/2023]
Abstract
Classical molecular dynamics simulations and free energy methods have been used to obtain a better understanding of the molecular processes occurring prior to the first nucleation event for calcium phosphate biominerals. The association constants for the formation of negatively charged complexes containing calcium and phosphate ions in aqueous solution have been computed, and these results suggest that the previously proposed calcium phosphate building unit, [Ca(HPO4)3]4-, should only be present in small amounts under normal experimental conditions. However, the presence of an activation barrier for the removal of an HPO4 2- ion from this complex indicates that this species could be kinetically trapped. Aggregation pathways involving CaHPO4, [Ca(HPO4)2]2-, and [Ca(HPO4)3]4- complexes have been explored with the finding that dimerization is favorable up to a Ca/HPO4 ratio of 1:2.
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Affiliation(s)
- Natalya
A. Garcia
- Curtin
Institute for Computation, The Institute for Geoscience Research (TIGeR),
and School of Molecular and Life Sciences, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia
| | - Riccardo Innocenti Malini
- Department
of Materials Science and Engineering, University
of Sheffield, Sheffield, S1 3JD, United Kingdom
- Laboratory
for Protection and Physiology, Empa, Swiss
Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland
| | - Colin L. Freeman
- Department
of Materials Science and Engineering, University
of Sheffield, Sheffield, S1 3JD, United Kingdom
| | - Raffaella Demichelis
- Curtin
Institute for Computation, The Institute for Geoscience Research (TIGeR),
and School of Molecular and Life Sciences, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia
| | - Paolo Raiteri
- Curtin
Institute for Computation, The Institute for Geoscience Research (TIGeR),
and School of Molecular and Life Sciences, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia
| | - Nico A. J. M. Sommerdijk
- Department
of Chemical Engineering and Chemistry, Technische
Universiteit Eindhoven, P.O. Box 513, Eindhoven, Netherlands
| | - John H. Harding
- Department
of Materials Science and Engineering, University
of Sheffield, Sheffield, S1 3JD, United Kingdom
| | - Julian D. Gale
- Curtin
Institute for Computation, The Institute for Geoscience Research (TIGeR),
and School of Molecular and Life Sciences, Curtin University, P.O. Box U1987, Perth, Western Australia 6845, Australia
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99
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Walton F, Wynne K. Using optical tweezing to control phase separation and nucleation near a liquid-liquid critical point. SOFT MATTER 2019; 15:8279-8289. [PMID: 31603454 DOI: 10.1039/c9sm01297d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
About 20 years ago, it was shown that lasers can nucleate crystals in super-saturated solutions and might even be able to select the polymorph that crystallises. However, no theoretical model was found explaining the results and progress was slowed down. Here we show that laser-induced nucleation may be understood in terms of the harnessing of concentration fluctuations near a liquid-liquid critical point using optical tweezing in a process called laser-induced phase separation (LIPS) and LIPS and nucleation (LIPSaN). A theoretical model is presented based on the regular solution model with an added term representing optical tweezing while the dynamics are modelled using a Kramers diffusion equation, and the roles of heat diffusion and thermophoresis are evaluated. LIPS and LIPSaN experiments were carried out on a range of liquid mixtures and the results compared to theory.
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100
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Yang L, Zhang W, He L, Li H, Zheng S. Study on the growth and morphology evolution of titanium oxide clusters in molten iron with molecular dynamics simulation. RSC Adv 2019; 9:32620-32627. [PMID: 35529748 PMCID: PMC9073090 DOI: 10.1039/c9ra05628a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Accepted: 09/10/2019] [Indexed: 11/21/2022] Open
Abstract
Formation of nano-scale titanium oxides is a desirable result in the deoxidation process of steelmaking. However, the nucleation of nano-scale titanium oxide inclusions remains unknown up to now because of the difficulty in observing and detecting inclusions in steel melt. In this work, we studied the formation and evolution of titanium oxygen clusters in molten iron by molecular dynamics (MD) simulation using empirical atomic interaction potentials. The structures of small titanium oxygen clusters in iron are reasonable compared to the first-principles simulation results. The growth process of small clusters into larger clusters was simulated and it is found the clusters grow through the collision mechanism, with the intermediate products exhibiting chain structures. The iron environment was found to play an important role in the structural form of the titanium oxygen clusters. This study is useful to provide the details of formation and the growth mechanism of titanium oxygen clusters and to provide a valuable picture for the nucleation mechanism of titanium oxide in molten steel. The aggregation and growth of titanium oxygen clusters before nucleation were simulated by molecular dynamics.![]()
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Affiliation(s)
- Likun Yang
- State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University Shanghai 200444 China
| | - Wei Zhang
- State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University Shanghai 200444 China .,Shanghai Institute of Applied Physics, Chinese Academy of Sciences (CAS) Shanghai 201800 China
| | - Liang He
- State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University Shanghai 200444 China
| | - Huigai Li
- State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University Shanghai 200444 China
| | - Shaobo Zheng
- State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University Shanghai 200444 China
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