1
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Olgenblum GI, Hutcheson BO, Pielak GJ, Harries D. Protecting Proteins from Desiccation Stress Using Molecular Glasses and Gels. Chem Rev 2024; 124:5668-5694. [PMID: 38635951 PMCID: PMC11082905 DOI: 10.1021/acs.chemrev.3c00752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 02/18/2024] [Accepted: 02/22/2024] [Indexed: 04/20/2024]
Abstract
Faced with desiccation stress, many organisms deploy strategies to maintain the integrity of their cellular components. Amorphous glassy media composed of small molecular solutes or protein gels present general strategies for protecting against drying. We review these strategies and the proposed molecular mechanisms to explain protein protection in a vitreous matrix under conditions of low hydration. We also describe efforts to exploit similar strategies in technological applications for protecting proteins in dry or highly desiccated states. Finally, we outline open questions and possibilities for future explorations.
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Affiliation(s)
- Gil I. Olgenblum
- Institute
of Chemistry, Fritz Haber Research Center, and The Harvey M. Krueger
Family Center for Nanoscience & Nanotechnology, The Hebrew University, Jerusalem 9190401, Israel
| | - Brent O. Hutcheson
- Department
of Chemistry, University of North Carolina
at Chapel Hill (UNC-CH), Chapel
Hill, North Carolina 27599, United States
| | - Gary J. Pielak
- Department
of Chemistry, University of North Carolina
at Chapel Hill (UNC-CH), Chapel
Hill, North Carolina 27599, United States
- Department
of Chemistry, Department of Biochemistry & Biophysics, Integrated
Program for Biological & Genome Sciences, Lineberger Comprehensive
Cancer Center, University of North Carolina
at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Daniel Harries
- Institute
of Chemistry, Fritz Haber Research Center, and The Harvey M. Krueger
Family Center for Nanoscience & Nanotechnology, The Hebrew University, Jerusalem 9190401, Israel
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2
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Hénot M, Nguyen XA, Ladieu F. Crossing the Frontier of Validity of the Material Time Approach in the Aging of a Molecular Glass. J Phys Chem Lett 2024; 15:3170-3177. [PMID: 38478899 DOI: 10.1021/acs.jpclett.4c00527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
We studied the physical aging of glycerol in response to upward temperature steps of amplitude ranging from 0.3 to 18 K. This was done using a specially designed experimental setup allowing quick heating of a liquid film while measuring the evolution of its dielectric properties. Despite the nonlinear evolution of these observables for large steps, a fictive temperature could be obtained. In the case of moderate step amplitudes, we checked that the material time approach in its simplest form, the single parameter aging (SPA), applies well. The memory kernel extracted from the quasi-linear regime was used to test its frontiers of validity for significant step amplitudes. We showed that the observations deviate from the prediction of the material time framework and of SPA simultaneously. As these approaches link aging to equilibrium dynamics, our results help set the bounds beyond which new theoretical arguments are needed.
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Affiliation(s)
- Marceau Hénot
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay Bat 772, 91191 Cedex Gif-sur-Yvette, France
| | - Xuan An Nguyen
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay Bat 772, 91191 Cedex Gif-sur-Yvette, France
| | - François Ladieu
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay Bat 772, 91191 Cedex Gif-sur-Yvette, France
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3
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Kremer F, Kipnusu WK, Fränzl M. Orientation Polarization Spectroscopy-Toward an Atomistic Understanding of Dielectric Relaxation Processes. Int J Mol Sci 2022; 23:ijms23158254. [PMID: 35897823 PMCID: PMC9330800 DOI: 10.3390/ijms23158254] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/21/2022] [Accepted: 07/22/2022] [Indexed: 02/06/2023] Open
Abstract
The theory of orientation polarization and dielectric relaxation was developed by P. Debye more than 100 years ago. It is based on approximating a molecule by a sphere having one or more dipole moments. By that the detailed intra- and intermolecular interactions are explicitly not taken into consideration. In this article, the principal limitations of the Debye approximation are discussed. Taking advantage of the molecular specificity of the infrared (IR) spectral range, measurements of the specific IR absorption of the stretching vibration υ(OH) (at 3370 cm−1) and the asymmetric υas(CH2) (at 2862.9 cm−1) are performed in dependence on the frequency and the strength of external electric fields and at varying temperature. The observed effects are interpreted as caused by orientation polarization of the OH and the adjacent CH2 moieties.
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4
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Hansen BB, Spittle S, Chen B, Poe D, Zhang Y, Klein JM, Horton A, Adhikari L, Zelovich T, Doherty BW, Gurkan B, Maginn EJ, Ragauskas A, Dadmun M, Zawodzinski TA, Baker GA, Tuckerman ME, Savinell RF, Sangoro JR. Deep Eutectic Solvents: A Review of Fundamentals and Applications. Chem Rev 2020; 121:1232-1285. [PMID: 33315380 DOI: 10.1021/acs.chemrev.0c00385] [Citation(s) in RCA: 728] [Impact Index Per Article: 182.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Deep eutectic solvents (DESs) are an emerging class of mixtures characterized by significant depressions in melting points compared to those of the neat constituent components. These materials are promising for applications as inexpensive "designer" solvents exhibiting a host of tunable physicochemical properties. A detailed review of the current literature reveals the lack of predictive understanding of the microscopic mechanisms that govern the structure-property relationships in this class of solvents. Complex hydrogen bonding is postulated as the root cause of their melting point depressions and physicochemical properties; to understand these hydrogen bonded networks, it is imperative to study these systems as dynamic entities using both simulations and experiments. This review emphasizes recent research efforts in order to elucidate the next steps needed to develop a fundamental framework needed for a deeper understanding of DESs. It covers recent developments in DES research, frames outstanding scientific questions, and identifies promising research thrusts aligned with the advancement of the field toward predictive models and fundamental understanding of these solvents.
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Affiliation(s)
- Benworth B Hansen
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee37996-2200, United States
| | - Stephanie Spittle
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee37996-2200, United States
| | - Brian Chen
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Derrick Poe
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Yong Zhang
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Jeffrey M Klein
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Alexandre Horton
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee37996-2200, United States
| | - Laxmi Adhikari
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, United States
| | - Tamar Zelovich
- Department of Chemistry, New York University, New York, New York 10003, United States
| | - Brian W Doherty
- Department of Chemistry, New York University, New York, New York 10003, United States
| | - Burcu Gurkan
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Edward J Maginn
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Arthur Ragauskas
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee37996-2200, United States
| | - Mark Dadmun
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Thomas A Zawodzinski
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee37996-2200, United States
| | - Gary A Baker
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, United States
| | - Mark E Tuckerman
- Department of Chemistry, New York University, New York, New York 10003, United States
| | - Robert F Savinell
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Joshua R Sangoro
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee37996-2200, United States
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5
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Gorka M, Cherepanov DA, Semenov AY, Golbeck JH. Control of electron transfer by protein dynamics in photosynthetic reaction centers. Crit Rev Biochem Mol Biol 2020; 55:425-468. [PMID: 32883115 DOI: 10.1080/10409238.2020.1810623] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Trehalose and glycerol are low molecular mass sugars/polyols that have found widespread use in the protection of native protein states, in both short- and long-term storage of biological materials, and as a means of understanding protein dynamics. These myriad uses are often attributed to their ability to form an amorphous glassy matrix. In glycerol, the glass is formed only at cryogenic temperatures, while in trehalose, the glass is formed at room temperature, but only upon dehydration of the sample. While much work has been carried out to elucidate a mechanistic view of how each of these matrices interact with proteins to provide stability, rarely have the effects of these two independent systems been directly compared to each other. This review aims to compile decades of research on how different glassy matrices affect two types of photosynthetic proteins: (i) the Type II bacterial reaction center from Rhodobacter sphaeroides and (ii) the Type I Photosystem I reaction center from cyanobacteria. By comparing aggregate data on electron transfer, protein structure, and protein dynamics, it appears that the effects of these two distinct matrices are remarkably similar. Both seem to cause a "tightening" of the solvation shell when in a glassy state, resulting in severely restricted conformational mobility of the protein and associated water molecules. Thus, trehalose appears to be able to mimic, at room temperature, nearly all of the effects on protein dynamics observed in low temperature glycerol glasses.
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Affiliation(s)
- Michael Gorka
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA
| | - Dmitry A Cherepanov
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russia.,A.N. Belozersky Institute of Physical-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Alexey Yu Semenov
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russia.,A.N. Belozersky Institute of Physical-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - John H Golbeck
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA.,Department of Chemistry, The Pennsylvania State University, University Park, PA, USA
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6
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Da Silva D, Lopes I, Da Silva L, Lima M, Barros Filho A, Villa-Vélez H, Santana A. Physical properties of films based on pectin and babassu coconut mesocarp. Int J Biol Macromol 2019; 130:419-428. [DOI: 10.1016/j.ijbiomac.2019.02.151] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 02/21/2019] [Accepted: 02/22/2019] [Indexed: 01/22/2023]
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7
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Alvarez Gaona IJ, Bater C, Zamora MC, Chirife J. Spray drying encapsulation of red wine: Stability of total monomeric anthocyanins and structural alterations upon storage. J FOOD PROCESS PRES 2017. [DOI: 10.1111/jfpp.13457] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Izmari Jasel Alvarez Gaona
- Facultad de Ingeniería y Ciencias AgrariasPontificia Universidad Católica Argentina, Av. Alicia Moreau de Justo 1516–1560 Ciudad Autónoma de Buenos Aires (CABA) C1107AFF, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Godoy Cruz 2290, Ciudad Autónoma de Buenos Aires (CABA), Argentina
| | - Caterina Bater
- Facultad de Ingeniería y Ciencias AgrariasPontificia Universidad Católica Argentina, Av. Alicia Moreau de Justo 1516–1560 Ciudad Autónoma de Buenos Aires (CABA) C1107AFF, Argentina
| | - María C. Zamora
- Facultad de Ingeniería y Ciencias AgrariasPontificia Universidad Católica Argentina, Av. Alicia Moreau de Justo 1516–1560 Ciudad Autónoma de Buenos Aires (CABA) C1107AFF, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Godoy Cruz 2290, Ciudad Autónoma de Buenos Aires (CABA), Argentina
| | - Jorge Chirife
- Facultad de Ingeniería y Ciencias AgrariasPontificia Universidad Católica Argentina, Av. Alicia Moreau de Justo 1516–1560 Ciudad Autónoma de Buenos Aires (CABA) C1107AFF, Argentina
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8
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Lyapin AG, Gromnitskaya E, Danilov IV, Brazhkin VV. Elastic properties of the hydrogen-bonded liquid and glassy glycerol under high pressure: comparison with propylene carbonate. RSC Adv 2017. [DOI: 10.1039/c7ra06165j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
We compare elastic properties of the liquid and glassy glycerol and propylene carbonate as the archetypal molecular glass formers with and without hydrogen bonding.
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Affiliation(s)
- A. G. Lyapin
- Institute for High Pressure Physics
- Russian Academy of Sciences
- Moscow
- 108840 Russia
- Moscow Institute of Physics and Technology
| | - E. L. Gromnitskaya
- Institute for High Pressure Physics
- Russian Academy of Sciences
- Moscow
- 108840 Russia
| | - I. V. Danilov
- Institute for High Pressure Physics
- Russian Academy of Sciences
- Moscow
- 108840 Russia
- Moscow Institute of Physics and Technology
| | - V. V. Brazhkin
- Institute for High Pressure Physics
- Russian Academy of Sciences
- Moscow
- 108840 Russia
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9
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Casalini R. The fragility of liquids and colloids and its relation to the softness of the potential. J Chem Phys 2013. [PMID: 23206028 DOI: 10.1063/1.4768267] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
A parameter that is often used to characterize the dynamics of supercooled liquids is the dynamic fragility, however it is still debated how the fragility is related to other physical properties. Recent experimental data on colloidal systems have found that fragility decreases with increasing softness of the intermolecular potential. This result is in apparent disagreement with recent molecular dynamics simulations reporting the opposite behavior. Herein, using the thermodynamical scaling exponent γ as a measure of the steepness of the potential we show how these different results can be reconciled and also agree with previous results obtained for the dynamics of supercooled liquids at high pressures.
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Affiliation(s)
- R Casalini
- Chemistry Division, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375-5342, USA
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10
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Caswell TA, Zhang Z, Gardel ML, Nagel SR. Observation and characterization of the vestige of the jamming transition in a thermal three-dimensional system. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:012303. [PMID: 23410327 DOI: 10.1103/physreve.87.012303] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Revised: 11/06/2012] [Indexed: 06/01/2023]
Abstract
We study the dependence on the packing fraction of the pair-correlation function g(r) and particle mobility in a dense three-dimensional packing of soft colloids made of poly N-isopropyl acrylamide (pNIPAM), a thermosensitive gel. We find that g(r) for our samples is qualitatively like that of a liquid at all packing fractions. There is a peak in g(1), the height of the first peak of g(r), as a function of the packing fraction. This peak is identified as a vestige, which remains at finite temperature, of the divergence found at the jamming transition in simulations of soft frictionless spheres at zero temperature. As the density is increased, the particle dynamics slow down and near the packing fraction where there is a peak in g(1) the particles become arrested on the time scale of the experiment.
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Affiliation(s)
- Thomas A Caswell
- The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA
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11
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Koperwas K, Grzybowski A, Grzybowska K, Wojnarowska Z, Pionteck J, Sokolov AP, Paluch M. Pressure coefficient of the glass transition temperature in the thermodynamic scaling regime. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 86:041502. [PMID: 23214586 DOI: 10.1103/physreve.86.041502] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Indexed: 06/01/2023]
Abstract
We report that the pressure coefficient of the glass transition temperature, dT(g)/dp, which is commonly used to determine the pressure sensitivity of the glass transition temperature T(g), can be predicted in the thermodynamic scaling regime. We show that the equation derived from the isochronal condition combined with the well-known scaling, TV(γ) = const, predicts successfully values of dT(g)/dp for a variety of glass-forming systems, including van der Waals liquids, polymers, and ionic liquids.
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Affiliation(s)
- K Koperwas
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
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12
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Schutyser MA, Perdana J, Boom RM. Single droplet drying for optimal spray drying of enzymes and probiotics. Trends Food Sci Technol 2012. [DOI: 10.1016/j.tifs.2012.05.006] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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13
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Hunter GL, Weeks ER. The physics of the colloidal glass transition. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2012; 75:066501. [PMID: 22790649 DOI: 10.1088/0034-4885/75/6/066501] [Citation(s) in RCA: 329] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
As one increases the concentration of a colloidal suspension, the system exhibits a dramatic increase in viscosity. Beyond a certain concentration, the system is said to be a colloidal glass; structurally, the system resembles a liquid, yet motions within the suspension are slow enough that it can be considered essentially frozen. For several decades, colloids have served as a valuable model system for understanding the glass transition in molecular systems. The spatial and temporal scales involved allow these systems to be studied by a wide variety of experimental techniques. The focus of this review is the current state of understanding of the colloidal glass transition, with an emphasis on experimental observations. A brief introduction is given to important experimental techniques used to study the glass transition in colloids. We describe features of colloidal systems near and in glassy states, including increases in viscosity and relaxation times, dynamical heterogeneity and ageing, among others. We also compare and contrast the glass transition in colloids to that in molecular liquids. Other glassy systems are briefly discussed, as well as recently developed synthesis techniques that will keep these systems rich with interesting physics for years to come.
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Affiliation(s)
- Gary L Hunter
- Department of Physics, Emory University, Math and Science Center 400 Dowman Dr., N201 Atlanta, GA 30322, USA
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14
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Daniels LJ, Haxton TK, Xu N, Liu AJ, Durian DJ. Temperature-pressure scaling for air-fluidized grains near jamming. PHYSICAL REVIEW LETTERS 2012; 108:138001. [PMID: 22540726 DOI: 10.1103/physrevlett.108.138001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Indexed: 05/31/2023]
Abstract
We present experiments on a monolayer of air-fluidized beads in which a jamming transition is approached by increasing pressure, increasing packing fraction, and decreasing kinetic energy. This is accomplished, along with a noninvasive measurement of pressure, by tilting the system and examining behavior versus depth. We construct an equation of state and analyze relaxation time versus effective temperature. By making time and effective temperature dimensionless using factors of pressure, bead size, and bead mass, we obtain a good collapse of the data but to a functional form that differs from that of thermal hard-sphere systems. The relaxation time appears to diverge only as the effective temperature to pressure ratio goes to zero.
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Affiliation(s)
- L J Daniels
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6396, USA
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15
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Pronin AA, Kondrin MV, Lyapin AG, Brazhkin VV, Volkov AA, Lunkenheimer P, Loidl A. Glassy dynamics under superhigh pressure. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2010; 81:041503. [PMID: 20481727 DOI: 10.1103/physreve.81.041503] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Indexed: 05/29/2023]
Abstract
Nearly all glass-forming liquids feature, along with the structural alpha-relaxation process, a faster secondary process (beta relaxation), whose nature belongs to the great mysteries of glass physics. However, for some of these liquids, no well-pronounced secondary relaxation is observed. A prominent example is the archetypical glass-forming liquid glycerol. In the present work, by performing dielectric spectroscopy under superhigh pressures up to 6 GPa, we show that in glycerol a significant secondary relaxation peak appears in the dielectric loss at P>3 GPa. We identify this beta relaxation to be of Johari-Goldstein type and discuss its relation to the excess wing. We provide evidence for a smooth but significant increase in glass-transition temperature and fragility on increasing pressure.
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Affiliation(s)
- A A Pronin
- General Physics Institute, Russian Academy of Sciences, Vavilov Street 38, Moscow 119991, Russia
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16
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Xu N, Haxton TK, Liu AJ, Nagel SR. Equivalence of glass transition and colloidal glass transition in the hard-sphere limit. PHYSICAL REVIEW LETTERS 2009; 103:245701. [PMID: 20366210 DOI: 10.1103/physrevlett.103.245701] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2009] [Indexed: 05/29/2023]
Abstract
We show that the slowing of the dynamics in simulations of several model glass-forming liquids is equivalent to the hard-sphere glass transition in the low-pressure limit. In this limit, we find universal behavior of the relaxation time by collapsing molecular-dynamics data for all systems studied onto a single curve as a function of T/p, the ratio of the temperature to the pressure. At higher pressures, there are deviations from this universal behavior that depend on the interparticle potential, implying that additional physical processes must enter into the dynamics of glass formation.
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Affiliation(s)
- Ning Xu
- Department of Physics, The Chinese University of Hong Kong, Hong Kong, People's Republic of China
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17
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Coslovich D, Roland CM. Density scaling in viscous liquids: From relaxation times to four-point susceptibilities. J Chem Phys 2009; 131:151103. [DOI: 10.1063/1.3250938] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Pawlus S, Paluch M, Ziolo J, Roland CM. On the pressure dependence of the fragility of glycerol. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:332101. [PMID: 21828591 DOI: 10.1088/0953-8984/21/33/332101] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This work was motivated by ostensibly contradictory results from different groups regarding the effect of pressure on the fragility of glycerol. We present new experimental data for an intermediate pressure regime showing that the fragility increases with pressure up to about 1.8 GPa, becoming invariant at higher pressures. There is no discrepancy among the various literature data taken in toto. The behavior of glycerol is quite distinct from that of normal liquids, a result of its substantial hydrogen bonding.
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Affiliation(s)
- S Pawlus
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
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19
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Athamneh AI, Griffin M, Whaley M, Barone JR. Conformational Changes and Molecular Mobility in Plasticized Proteins. Biomacromolecules 2008; 9:3181-7. [DOI: 10.1021/bm800759g] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ahmad I. Athamneh
- Biological Systems Engineering Department, Virginia Tech, 303 Seitz Hall, Blacksburg, Virginia 24061
| | - Michael Griffin
- Biological Systems Engineering Department, Virginia Tech, 303 Seitz Hall, Blacksburg, Virginia 24061
| | - Meocha Whaley
- Biological Systems Engineering Department, Virginia Tech, 303 Seitz Hall, Blacksburg, Virginia 24061
| | - Justin R. Barone
- Biological Systems Engineering Department, Virginia Tech, 303 Seitz Hall, Blacksburg, Virginia 24061
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20
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Coslovich D, Roland CM. Thermodynamic Scaling of Diffusion in Supercooled Lennard-Jones Liquids. J Phys Chem B 2008; 112:1329-32. [DOI: 10.1021/jp710457e] [Citation(s) in RCA: 145] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D. Coslovich
- Dipartimento di Fisica Teorica, Università di Trieste, Strada Costiera 11, 34100 Trieste, Italy, and Naval Research Laboratory, Code 6120, Washington, District of Columbia 20375-5342
| | - C. M. Roland
- Dipartimento di Fisica Teorica, Università di Trieste, Strada Costiera 11, 34100 Trieste, Italy, and Naval Research Laboratory, Code 6120, Washington, District of Columbia 20375-5342
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21
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Le Grand A, Dreyfus C, Bousquet C, Pick RM. Scaling of the structural relaxation in simulated liquid silica. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2007; 75:061203. [PMID: 17677247 DOI: 10.1103/physreve.75.061203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2006] [Revised: 02/07/2007] [Indexed: 05/16/2023]
Abstract
A scaling law for the alpha relaxation time tau , involving the ratio of a density-dependent energy to the thermal energy, has been found to hold in many fragile glass-forming liquids. This scaling has been recently linked to a local quantity n{loc}(rho,T) relating the variation of tau with density to its variation with temperature. In many fragile liquids, the variation of n{loc}(rho,T) is weak enough to take it as constant over the experimental temperature and density domain. We show that simulated liquid silica has an opposite behavior; close to T{g}, n{loc} is negative for moderate densities and exhibits a significant variation with rho and T, reaching positive values for higher temperature and/or densities. Moreover, those variations linearly correlate to a measure of the bonding properties of the liquid.
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Affiliation(s)
- A Le Grand
- I.M.P.M.C., Université Pierre et Marie Curie-Paris 6 and CNRS-UMR 7590, Paris, France
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Roland CM, Bair S, Casalini R. Thermodynamic scaling of the viscosity of van der Waals, H-bonded, and ionic liquids. J Chem Phys 2006; 125:124508. [PMID: 17014192 DOI: 10.1063/1.2346679] [Citation(s) in RCA: 144] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Viscosities eta and their temperature T and volume V dependences are reported for seven molecular liquids and polymers. In combination with literature viscosity data for five other liquids, we show that the superpositioning of relaxation times for various glass-forming materials when expressed as a function of TV(gamma), where the exponent gamma is a material constant, can be extended to the viscosity. The latter is usually measured to higher temperatures than the corresponding relaxation times, demonstrating the validity of the thermodynamic scaling throughout the supercooled and higher T regimes. The value of gamma for a given liquid principally reflects the magnitude of the intermolecular forces (e.g., steepness of the repulsive potential); thus, we find decreasing gamma in going from van der Waals fluids to ionic liquids. For some strongly H-bonded materials, such as low molecular weight polypropylene glycol and water, the superpositioning fails, due to the nontrivial change of chemical structure (degree of H bonding) with thermodynamic conditions.
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Affiliation(s)
- C M Roland
- Chemistry Division, Naval Research Laboratory, Code 6120, Washington, DC 20375-5342, USA.
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