101
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Sosso GC, Miceli G, Caravati S, Giberti F, Behler J, Bernasconi M. Fast Crystallization of the Phase Change Compound GeTe by Large-Scale Molecular Dynamics Simulations. J Phys Chem Lett 2013; 4:4241-4246. [PMID: 26296172 DOI: 10.1021/jz402268v] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Phase change materials are of great interest as active layers in rewritable optical disks and novel electronic nonvolatile memories. These applications rest on a fast and reversible transformation between the amorphous and crystalline phases upon heating, taking place on the nanosecond time scale. In this work, we investigate the microscopic origin of the fast crystallization process by means of large-scale molecular dynamics simulations of the phase change compound GeTe. To this end, we use an interatomic potential generated from a Neural Network fitting of a large database of ab initio energies. We demonstrate that in the temperature range of the programming protocols of the electronic memories (500-700 K), nucleation of the crystal in the supercooled liquid is not rate-limiting. In this temperature range, the growth of supercritical nuclei is very fast because of a large atomic mobility, which is, in turn, the consequence of the high fragility of the supercooled liquid and the associated breakdown of the Stokes-Einstein relation between viscosity and diffusivity.
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Affiliation(s)
- Gabriele C Sosso
- †Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 53, I-20125 Milano, Italy
- ‡Department of Chemistry and Applied Biosciences and Facoltà di Informatica, ETH Zurich and Università della Svizzera Italiana, Istituto di Scienze Computazionali, Via G. Buffi 13, CH-6900 Lugano, Switzerland
| | - Giacomo Miceli
- ¶Chaire de Simulation à l'Echelle Atomique (CSEA), Ecole Polytechnique Fèdèrale de Lausanne (EPFL), PH H2 482 Station 3, CH-1015 Lausanne, Switzerland
| | - Sebastiano Caravati
- †Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 53, I-20125 Milano, Italy
| | - Federico Giberti
- ‡Department of Chemistry and Applied Biosciences and Facoltà di Informatica, ETH Zurich and Università della Svizzera Italiana, Istituto di Scienze Computazionali, Via G. Buffi 13, CH-6900 Lugano, Switzerland
| | - Jörg Behler
- §Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, Universitätstrasse 150, D-44780 Bochum, Germany
| | - Marco Bernasconi
- †Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi 53, I-20125 Milano, Italy
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102
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Rodrigues AC, Viciosa MT, Danède F, Affouard F, Correia NT. Molecular Mobility of Amorphous S-Flurbiprofen: A Dielectric Relaxation Spectroscopy Approach. Mol Pharm 2013; 11:112-30. [DOI: 10.1021/mp4002188] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. C. Rodrigues
- REQUIMTE/CQFB, Departamento de Química, Faculdade
de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - M. T. Viciosa
- CQFM − Centro
de Química-Física Molecular and IN − Institute
of Nanoscience and Nanotechnology, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - F. Danède
- Unité Matériaux et Transformation (UMET), UMR CNRS
8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - F. Affouard
- Unité Matériaux et Transformation (UMET), UMR CNRS
8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - N. T. Correia
- REQUIMTE/CQFB, Departamento de Química, Faculdade
de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
- Unité Matériaux et Transformation (UMET), UMR CNRS
8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
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103
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Tang C, Harrowell P. Anomalously slow crystal growth of the glass-forming alloy CuZr. NATURE MATERIALS 2013; 12:507-11. [PMID: 23624630 DOI: 10.1038/nmat3631] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 03/13/2013] [Indexed: 05/11/2023]
Abstract
Our ability to exploit the benefits of metallic glasses depends on identifying alloys of high glass-forming ability (GFA). So far, the established empirical correlations of GFA (ref. ) are statistical guides at best and lack a microscopic rationale. Although simulations have the potential to provide this physical insight into the maximum crystallization rate, crystal nucleation is often too slow to be observed. In contrast, measuring the growth rate of a planar crystal surface represents an accessible route to understanding ordering kinetics. Here we use molecular dynamics simulations to show that the crystal growth rate for an important binary glass former, CuZr, is significantly slower than that of a poor glass former, NiAl. In accounting for this difference, we find that the crystal/liquid interface in NiAl exhibits a significantly greater width than that of CuZr. Our results suggest that the crystal/liquid interfacial structure exerts an important influence on the GFA of alloys.
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Affiliation(s)
- Chunguang Tang
- School of Chemistry, The University of Sydney, New South Wales 2006, Australia
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104
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Jancar J, Balkova R. Effect of interfacial interactions on the crystal growth rate in model PE/SiO2
nanocomposites: Comparing experiments with Lauritzen-Hoffman model and MD simulation. POLYM ENG SCI 2013. [DOI: 10.1002/pen.23524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- J. Jancar
- Institute of Materials Chemistry; School of Chemistry; Brno University of Technology; Brno Czech Republic
- Central European Institute of Technology (CEITEC); Brno University of Technology; Brno Czech Republic
| | - R. Balkova
- Institute of Materials Chemistry; School of Chemistry; Brno University of Technology; Brno Czech Republic
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105
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Salinga M, Carria E, Kaldenbach A, Bornhöfft M, Benke J, Mayer J, Wuttig M. Measurement of crystal growth velocity in a melt-quenched phase-change material. Nat Commun 2013; 4:2371. [PMID: 23986035 PMCID: PMC3763494 DOI: 10.1038/ncomms3371] [Citation(s) in RCA: 154] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 07/29/2013] [Indexed: 11/09/2022] Open
Abstract
Phase-change materials are the basis for next-generation memory devices and reconfigurable electronics, but fundamental understanding of the unconventional kinetics of their phase transitions has been hindered by challenges in the experimental quantification. Here we obtain deeper understanding based on the temperature dependence of the crystal growth velocity of the phase-change material AgInSbTe, as derived from laser-based time-resolved reflectivity measurements. We observe a strict Arrhenius behaviour for the growth velocity over eight orders of magnitude (from ~10 nm s(-1) to ~1 m s(-1)). This can be attributed to the formation of a glass at elevated temperatures because of rapid quenching of the melt. Further, the temperature dependence of the viscosity is derived, which reveals that the supercooled liquid phase must have an extremely high fragility (>100). Finally, the new experimental evidence leads to an interpretation, which comprehensively explains existing data from various different experiments reported in literature.
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Affiliation(s)
- Martin Salinga
- I. Physikalisches Institut (IA) and JARA-FIT, RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany
| | - Egidio Carria
- I. Physikalisches Institut (IA) and JARA-FIT, RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany
| | - Andreas Kaldenbach
- I. Physikalisches Institut (IA) and JARA-FIT, RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany
| | - Manuel Bornhöfft
- Gemeinschaftslabor für Elektronenmikroskopie, RWTH Aachen University, Ahornstraße 55, 52074 Aachen, Germany
| | - Julia Benke
- I. Physikalisches Institut (IA) and JARA-FIT, RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany
| | - Joachim Mayer
- Gemeinschaftslabor für Elektronenmikroskopie, RWTH Aachen University, Ahornstraße 55, 52074 Aachen, Germany
| | - Matthias Wuttig
- I. Physikalisches Institut (IA) and JARA-FIT, RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany
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106
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Chen Z, Bi D, Liu R, Tian Y, Wang LM, Ngai KL. Relaxation dynamics in glass forming liquids with related molecular structures. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.09.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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107
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Caroli C, Lemaître A. Ultrafast spherulitic crystal growth as a stress-induced phenomenon specific of fragile glass-formers. J Chem Phys 2012; 137:114506. [DOI: 10.1063/1.4753976] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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108
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Paeng K, Powell CT, Yu L, Ediger MD. Fast Crystal Growth Induces Mobility and Tension in Supercooled o-Terphenyl. J Phys Chem Lett 2012; 3:2562-2567. [PMID: 26295875 DOI: 10.1021/jz301111x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A photobleaching method was used to measure the reorientation of dilute probes in liquid o-terphenyl near a crystal growth front. Near the glass-transition temperature Tg, mobility in the supercooled liquid was enhanced within ∼10 μm of the crystal growth front, by as much as a factor of 4. This enhanced mobility appears to be caused by tension created in the sample as a result of the density difference between the supercooled liquid and crystal. The maximum observed mobility enhancement corresponds to a tension of about -8 MPa, close to the cavitation limit for liquid o-terphenyl. Whereas the observed mobility near the growing crystal is not large enough to explain the extraordinary fast crystal growth observed near Tg in o-terphenyl and some other low-molecular-weight glassformers, these observations suggest that cavitation or fracture plays a key role in releasing tension and allowing fast crystal growth to occur at a steady rate.
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Affiliation(s)
- Keewook Paeng
- †Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - C Travis Powell
- †Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
- ‡School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, United States
| | - Lian Yu
- †Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
- ‡School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, United States
| | - M D Ediger
- †Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
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109
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Affiliation(s)
- M. D. Ediger
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Peter Harrowell
- School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
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110
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Sun Y, Zhu L, Wu T, Cai T, Gunn EM, Yu L. Stability of amorphous pharmaceutical solids: crystal growth mechanisms and effect of polymer additives. AAPS JOURNAL 2012; 14:380-8. [PMID: 22434258 DOI: 10.1208/s12248-012-9345-6] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Accepted: 03/05/2012] [Indexed: 11/30/2022]
Abstract
We review recent progress toward understanding and enhancing the stability of amorphous pharmaceutical solids against crystallization. As organic liquids are cooled to become glasses, fast modes of crystal growth can emerge. One such growth mode, the glass-to-crystal or GC mode, occurs in the bulk, and another exists at the free surface, both leading to crystal growth much faster than predicted by theories that assume diffusion defines the kinetic barrier of crystallization. These phenomena have received different explanations, and we propose that GC growth is a solid-state transformation enabled by local mobility in glasses and that fast surface crystal growth is facilitated by surface molecular mobility. In the second part, we review recent findings concerning the effect of polymer additives on crystallization in organic glasses. Low-concentration polymer additives can strongly inhibit crystal growth in the bulk of organic glasses, while having weaker effect on surface crystal growth. Ultra-thin polymer coatings can inhibit surface crystallization. Recent work has shown the importance of molecular weight for crystallization inhibitors of organic glasses, besides "direct intermolecular interactions" such as hydrogen bonding. Relative to polyvinylpyrrolidone, the VP dimer is far less effective in inhibiting crystal growth in amorphous nifedipine. Further work is suggested for better understanding of crystallization of amorphous organic solids and the prediction of their stability.
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Affiliation(s)
- Ye Sun
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, 02139, USA.
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111
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Orava J, Greer AL, Gholipour B, Hewak DW, Smith CE. Characterization of supercooled liquid Ge2Sb2Te5 and its crystallization by ultrafast-heating calorimetry. NATURE MATERIALS 2012; 11:279-83. [PMID: 22426461 DOI: 10.1038/nmat3275] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Accepted: 02/09/2012] [Indexed: 05/09/2023]
Abstract
Differential scanning calorimetry (DSC) is widely used to study the stability of amorphous solids, characterizing the kinetics of crystallization close to the glass-transition temperature T(g). We apply ultrafast DSC to the phase-change material Ge(2)Sb(2)Te(5) (GST) and show that if the range of heating rates is extended to more than 10(4) K s(-1), the analysis can cover a wider temperature range, up to the point where the crystal growth rate approaches its maximum. The growth rates that can be characterized are some four orders of magnitude higher than in conventional DSC, reaching values relevant for the application of GST as a data-storage medium. The kinetic coefficient for crystal growth has a strongly non-Arrhenius temperature dependence, revealing that supercooled liquid GST has a high fragility. Near T(g) there is evidence for decoupling of the crystal-growth kinetics from viscous flow, matching the behaviour for a fragile liquid suggested by studies on oxide and organic systems.
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112
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Nascimento MLF, Fokin VM, Zanotto ED, Abyzov AS. Dynamic processes in a silicate liquid from above melting to below the glass transition. J Chem Phys 2012; 135:194703. [PMID: 22112093 DOI: 10.1063/1.3656696] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We collect and critically analyze extensive literature data, including our own, on three important kinetic processes--viscous flow, crystal nucleation, and growth--in lithium disilicate (Li(2)O·2SiO(2)) over a wide temperature range, from above T(m) to 0.98T(g) where T(g) ≈ 727 K is the calorimetric glass transition temperature and T(m) = 1307 K, which is the melting point. We found that crystal growth mediated by screw dislocations is the most likely growth mechanism in this system. We then calculated the diffusion coefficients controlling crystal growth, D(eff)(U), and completed the analyses by looking at the ionic diffusion coefficients of Li(+1), O(2-), and Si(4+) estimated from experiments and molecular dynamic simulations. These values were then employed to estimate the effective volume diffusion coefficients, D(eff)(V), resulting from their combination within a hypothetical Li(2)Si(2)O(5) "molecule". The similarity of the temperature dependencies of 1/η, where η is shear viscosity, and D(eff)(V) corroborates the validity of the Stokes-Einstein/Eyring equation (SEE) at high temperatures around T(m). Using the equality of D(eff)(V) and D(eff)(η), we estimated the jump distance λ ~ 2.70 Å from the SEE equation and showed that the values of D(eff)(U) have the same temperature dependence but exceed D(eff)(η) by about eightfold. The difference between D(eff)(η) and D(eff)(U) indicates that the former determines the process of mass transport in the bulk whereas the latter relates to the mobility of the structural units on the crystal/liquid interface. We then employed the values of η(T) reduced by eightfold to calculate the growth rates U(T). The resultant U(T) curve is consistent with experimental data until the temperature decreases to a decoupling temperature T(d)(U) ≈ 1.1-1.2T(g), when D(eff)(η) begins decrease with decreasing temperature faster than D(eff)(U). A similar decoupling occurs between D(eff)(η) and D(eff)(τ) (estimated from nucleation time-lags) but at a lower temperatureT(d)(τ) ≈ T(g). For T > T(g) the values of D(eff)(τ) exceed D(eff)(η) only by twofold. The different behaviors of D(eff)(τ)(T) and D(eff)(U)(T) are likely caused by differences in the mechanisms of critical nuclei formation. Therefore, we have shown that at low undercoolings, viscosity data can be employed for quantitative analyses of crystal growth rates, but in the deeply supercooled liquid state, mass transport for crystal nucleation and growth are not controlled by viscosity. The origin of decoupling is assigned to spatially dynamic heterogeneity in glass-forming melts.
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Affiliation(s)
- Marcio Luis Ferreira Nascimento
- Institute of Humanities, Arts & Sciences, Federal University of Bahia, Rua Barão de Jeremoabo s∕n, Glauber Rocha Pavilion (PAF 3), Ondina University Campus, 40170-115 Salvador-BA, Brazil
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113
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Kaminski K, Adrjanowicz K, Wojnarowska Z, Dulski M, Wrzalik R, Paluch M, Kaminska E, Kasprzycka A. Do intermolecular interactions control crystallization abilities of glass-forming liquids? J Phys Chem B 2011; 115:11537-47. [PMID: 21877734 DOI: 10.1021/jp202368b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Broadband dielectric spectroscopy was used to investigate molecular dynamics of three very similar systems: D-glucose, α-pentaacetylglucose, and β-pentaacetylglucose in a wide range of temperatures. We found out that two latter systems (differing only in location of the acetyl group attached to the first carbon in the sugar ring) reveal completely opposite tendencies to crystallization. Therefore, the aim of this Article was to investigate in detail molecular dynamics of both pentaacetylglucoses to assess what are the underlying of different crystallization abilities of so closely related carbohydrates. To analyze the kinetics of crystallization, we used Avrami and Avramov approaches. Interestingly, we found out that both α-and β-pentaacetylglucose exhibit completely different crystallization mechanisms. In the first case, the value of Avrami exponent was estimated to be n = 2, whereas for the second carbohydrate this exponent was equaled to n = 5.5. Additionally, we have carried out isothermal time-dependent dielectric measurements on D-glucose to demonstrate that this saccharide is more stable than its acetyl derivatives. Results presented in this Article indicate that besides molecular mobility, the character of the intermolecular interactions might also be another important factor governing crystallization process. Surprisingly, this issue is not often addressed during studies on crystallization abilities of different glass-formers. Finally, additional optical measurements were carried out to get more detailed information about nucleation density, activation barrier for a crystal growth, and morphology of crystallization structures.
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Affiliation(s)
- K Kaminski
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
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114
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Griffin P, Agapov AL, Kisliuk A, Sun XG, Dai S, Novikov VN, Sokolov AP. Decoupling charge transport from the structural dynamics in room temperature ionic liquids. J Chem Phys 2011; 135:114509. [DOI: 10.1063/1.3638269] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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115
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Cai T, Zhu L, Yu L. Crystallization of Organic Glasses: Effects of Polymer Additives on Bulk and Surface Crystal Growth in Amorphous Nifedipine. Pharm Res 2011; 28:2458-66. [DOI: 10.1007/s11095-011-0472-z] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Accepted: 05/03/2011] [Indexed: 11/29/2022]
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116
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Wen P, Harrowell P, Angell CA. Fast and slow components in the crystallization of a model multicomponent system, NaKCa(NO3): the role of composition fluctuations. J Phys Chem A 2011; 115:6260-8. [PMID: 21548638 DOI: 10.1021/jp111835z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We use calorimetrically detected crystal nucleation and growth studies to broaden the discussion of fluctuation-induced nucleation processes to include composition fluctuations in ionic complex-forming systems. We use the model system Ca(NO(3))(2)-KNO(3) with NaNO(3) introduced as a third component, so that crystallization kinetics can be controlled by change of alkali cation at constant mole fraction of Ca(NO(3))(2). At fixed NaNO(3) content, we find separate and thermodynamically anomalous kinetics for the crystallization of NaNO(3) and Ca(NO(3))(2),which we attribute to the importance of slow concentration fluctuations in the latter case. The "nose" of the time-temperature-transformation TTT curve for crystallization of the Ca(NO(3))(2) occurs at much higher temperatures and longer times than that for NaNO(3) and the shape of the curve is different. Above the metastable liquidus surface of NaNO(3), supercooled ternary melts can persist for long times. Suppression of the fast NaNO(3) crystallization, by replacement of Na(+) by K(+), is a prerequisite for easy vitrification in this system.
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Affiliation(s)
- Ping Wen
- School of Chemistry, University of Sydney, 2006 NSW, Australia
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117
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Agapov AL, Sokolov AP. Decoupling Ionic Conductivity from Structural Relaxation: A Way to Solid Polymer Electrolytes? Macromolecules 2011. [DOI: 10.1021/ma2001096] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. L. Agapov
- Department of Polymer Science, University of Akron, Akron, Ohio 44325-3909, United States
- Department of Chemistry and Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1600, United States
- Chemical Sciences Division, ORNL, Oak Ridge, Tennessee 37830-6197, United States
| | - A. P. Sokolov
- Department of Chemistry and Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1600, United States
- Chemical Sciences Division, ORNL, Oak Ridge, Tennessee 37830-6197, United States
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118
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Bhattacharya S, Suryanarayanan R. Molecular Motions in Sucrose-PVP and Sucrose-Sorbitol Dispersions: I. Implications of Global and Local Mobility on Stability. Pharm Res 2011; 28:2191-203. [DOI: 10.1007/s11095-011-0447-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2010] [Accepted: 04/05/2011] [Indexed: 11/29/2022]
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119
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Nascimento MLF, Dutra Zanotto E. Does viscosity describe the kinetic barrier for crystal growth from the liquidus to the glass transition? J Chem Phys 2010; 133:174701. [DOI: 10.1063/1.3490793] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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120
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Zhu L, Jona J, Nagapudi K, Wu T. Fast surface crystallization of amorphous griseofulvin below T g. Pharm Res 2010; 27:1558-67. [PMID: 20414704 DOI: 10.1007/s11095-010-0140-8] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Accepted: 03/29/2010] [Indexed: 11/25/2022]
Abstract
PURPOSE To study crystal growth rates of amorphous griseofulvin (GSF) below its glass transition temperature (T (g)) and the effect of surface crystallization on the overall crystallization kinetics of amorphous GSF. METHODS Amorphous GSF was generated by melt quenching. Surface and bulk crystal growth rates were determined using polarized light microscope. X-ray powder diffraction (XRPD) and Raman microscopy were used to identify the polymorph of the crystals. Crystallization kinetics of amorphous GSF powder stored at 40 degrees C (T (g)-48 degrees C) and room temperature (T (g)-66 degrees C) was monitored using XRPD. RESULTS Crystal growth at the surface of amorphous GSF is 10- to 100-fold faster than that in the bulk. The surface crystal growth can be suppressed by an ultrathin gold coating. Below T (g), the crystallization of amorphous GSF powder was biphasic with a rapid initial crystallization stage dominated by the surface crystallization and a slow or suspended late stage controlled by the bulk crystallization. CONCLUSIONS GSF exhibits the fastest surface crystallization kinetics among the known amorphous pharmaceutical solids. Well below T (g), surface crystallization dominated the overall crystallization kinetics of amorphous GSF powder. Thus, surface crystallization should be distinguished from bulk crystallization in studying, modeling and controlling the crystallization of amorphous solids.
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Affiliation(s)
- Lei Zhu
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
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121
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Affiliation(s)
- David Chandler
- Department of Chemistry, University of California, Berkeley, California 94720;
| | - Juan P. Garrahan
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom;
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122
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Sanz A, Nogales A, Ezquerra TA. Influence of Fragility on Polymer Cold Crystallization. Macromolecules 2009. [DOI: 10.1021/ma902289k] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alejandro Sanz
- Instituto de Estructura de la Materia, CSIC. Serrano 121, Madrid 28006, Spain
| | - Aurora Nogales
- Instituto de Estructura de la Materia, CSIC. Serrano 121, Madrid 28006, Spain
| | - Tiberio A. Ezquerra
- Instituto de Estructura de la Materia, CSIC. Serrano 121, Madrid 28006, Spain
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123
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Bhattacharya S, Suryanarayanan R. Local Mobility in Amorphous Pharmaceuticals—Characterization and Implications on Stability. J Pharm Sci 2009; 98:2935-53. [DOI: 10.1002/jps.21728] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Sun Y, Xi H, Ediger MD, Richert R, Yu L. Diffusion-controlled and “diffusionless” crystal growth near the glass transition temperature: Relation between liquid dynamics and growth kinetics of seven ROY polymorphs. J Chem Phys 2009; 131:074506. [DOI: 10.1063/1.3200228] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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125
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Tripathy M, Schweizer KS. The influence of shape on the glassy dynamics of hard nonspherical particle fluids. I. Dynamic crossover and elasticity. J Chem Phys 2009; 130:244906. [DOI: 10.1063/1.3157279] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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126
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Sokolov AP, Schweizer KS. Resolving the mystery of the chain friction mechanism in polymer liquids. PHYSICAL REVIEW LETTERS 2009; 102:248301. [PMID: 19659051 DOI: 10.1103/physrevlett.102.248301] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Indexed: 05/28/2023]
Abstract
We propose an explanation for the long-standing puzzles of the microscopic mechanism of chain friction and the failure of time-temperature superposition in polymer melts based on decoupling of macromolecular scale diffusion from local structural relaxation due to spatially heterogeneous dynamics. The proposed physical picture is also relevant for understanding some aspects of dynamic fluctuation and decoupling phenomena in nonpolymeric glass-forming liquids, crystal growth rates, and protein activity in viscous solvents.
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Affiliation(s)
- Alexei P Sokolov
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, USA.
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127
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Xi H, Sun Y, Yu L. Diffusion-controlled and diffusionless crystal growth in liquid o-terphenyl near its glass transition temperature. J Chem Phys 2009; 130:094508. [DOI: 10.1063/1.3081047] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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128
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Swallen SF, Traynor K, McMahon RJ, Ediger MD, Mates TE. Self-Diffusion of Supercooled Tris-naphthylbenzene. J Phys Chem B 2009; 113:4600-8. [DOI: 10.1021/jp808912e] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stephen F. Swallen
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53705
| | - Katherine Traynor
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53705
| | - Robert J. McMahon
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53705
| | - M. D. Ediger
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53705
| | - Thomas E. Mates
- Materials Department, University of California-Santa Barbara, Santa Barbara, California 93106
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129
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Affiliation(s)
- Lei Zhu
- School of Pharmacy and Department of Chemistry, University of Wisconsin—Madison, 777 Highland Avenue, Madison, Wisconsin 53705-2222
| | - Letitia Wong
- School of Pharmacy and Department of Chemistry, University of Wisconsin—Madison, 777 Highland Avenue, Madison, Wisconsin 53705-2222
| | - Lian Yu
- School of Pharmacy and Department of Chemistry, University of Wisconsin—Madison, 777 Highland Avenue, Madison, Wisconsin 53705-2222
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130
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Sun Y, Xi H, Chen S, Ediger MD, Yu L. Crystallization near Glass Transition: Transition from Diffusion-Controlled to Diffusionless Crystal Growth Studied with Seven Polymorphs. J Phys Chem B 2008; 112:5594-601. [DOI: 10.1021/jp7120577] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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