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Li Y, Annamareddy A, Morgan D, Yu Z, Wang B, Cao C, Perepezko JH, Ediger MD, Voyles PM, Yu L. Surface Diffusion Is Controlled by Bulk Fragility across All Glass Types. PHYSICAL REVIEW LETTERS 2022; 128:075501. [PMID: 35244425 DOI: 10.1103/physrevlett.128.075501] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 01/07/2022] [Indexed: 06/14/2023]
Abstract
Surface diffusion is vastly faster than bulk diffusion in some glasses, but only moderately enhanced in others. We show that this variation is closely linked to bulk fragility, a common measure of how quickly dynamics is excited when a glass is heated to become a liquid. In fragile molecular glasses, surface diffusion can be a factor of 10^{8} faster than bulk diffusion at the glass transition temperature, while in the strong system SiO_{2}, the enhancement is a factor of 10. Between these two extremes lie systems of intermediate fragility, including metallic glasses and amorphous selenium and silicon. This indicates that stronger liquids have greater resistance to dynamic excitation from bulk to surface and enables prediction of surface diffusion, surface crystallization, and formation of stable glasses by vapor deposition.
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Affiliation(s)
- Yuhui Li
- School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA
| | - Ajay Annamareddy
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Dane Morgan
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Zheng Yu
- Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Bu Wang
- Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Chengrong Cao
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - John H Perepezko
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - M D Ediger
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Paul M Voyles
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Lian Yu
- School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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Guseva DV, Chertovich AV, Rudyak VY. Systematic study of glass transition in low-molecular phthalonitriles: Insight from computer simulations. J Chem Phys 2016; 145:144503. [PMID: 27782502 DOI: 10.1063/1.4964616] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- D. V. Guseva
- Department of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - A. V. Chertovich
- Department of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - V. Yu. Rudyak
- Department of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
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Yu L. Surface mobility of molecular glasses and its importance in physical stability. Adv Drug Deliv Rev 2016; 100:3-9. [PMID: 26774328 DOI: 10.1016/j.addr.2016.01.005] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Revised: 01/04/2016] [Accepted: 01/05/2016] [Indexed: 11/26/2022]
Abstract
Amorphous molecular materials (molecular glasses) are useful for drug delivery, bio-preservation and organic electronics. A central issue in developing amorphous materials is the stability against crystallization and other transformations that can compromise material performance. We review recent progress in understanding the stability of molecular glasses, particularly the role for surface mobility. Surface diffusion in molecular glasses can be vastly faster than bulk diffusion. This high surface mobility enables fast crystal growth on the free surface. In this process, surface crystals grow upward and laterally, with the lateral growth rate being roughly proportional to surface diffusivity. Surface mobility also influences bulk crystal growth as the process can create fracture and free surfaces. During vapor deposition, surface mobility allows efficient equilibration of newly deposited molecules, producing low-energy, high-density glasses that are equivalent to liquid-cooled glasses aged for thousands of years. Free surfaces can accelerate chemical degradation of proteins. Measures for inhibiting surface-facilitated transformations include minimizing free surfaces, applying surface coatings, and preventing fracture.
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Eastwood MP, Chitra T, Jumper JM, Palmo K, Pan AC, Shaw DE. Rotational Relaxation in ortho-Terphenyl: Using Atomistic Simulations to Bridge Theory and Experiment. J Phys Chem B 2013; 117:12898-907. [DOI: 10.1021/jp402102w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
| | - Tarun Chitra
- D. E. Shaw Research, New York, New York 10036, United States
| | - John M. Jumper
- D. E. Shaw Research, New York, New York 10036, United States
| | - Kim Palmo
- D. E. Shaw Research, New York, New York 10036, United States
| | - Albert C. Pan
- D. E. Shaw Research, New York, New York 10036, United States
| | - David E. Shaw
- D. E. Shaw Research, New York, New York 10036, United States
- Center for Computational Biology
and Bioinformatics, Columbia University, New York, New York 10032, United States
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Boué L, Hentschel HGE, Ilyin V, Procaccia I. Statistical Mechanics of Glass Formation in Molecular Liquids with OTP as an Example. J Phys Chem B 2011; 115:14301-10. [DOI: 10.1021/jp205773c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Laurent Boué
- The Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - H. G. E. Hentschel
- The Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Valery Ilyin
- The Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Itamar Procaccia
- The Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Shi Z, Debenedetti PG, Stillinger FH. Properties of model atomic free-standing thin films. J Chem Phys 2011; 134:114524. [DOI: 10.1063/1.3565480] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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Hoopes MI, Noro MG, Longo ML, Faller R. Bilayer structure and lipid dynamics in a model stratum corneum with oleic acid. J Phys Chem B 2011; 115:3164-71. [PMID: 21370846 DOI: 10.1021/jp109563s] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The stratum corneum is the uppermost layer of the skin and acts as a barrier to keep out contaminants and retain moisture. Understanding the molecular structure and behavior of this layer will provide guidance for optimizing its biological function. In this study we use a model mixture comprised of equimolar portions of ceramide NS (24:0), lignoceric acid, and cholesterol to model the effect of the addition of small amounts of oleic acid to the bilayer at 300 and 340 K. Five systems at each temperature have been simulated with concentrations between 0 and 0.1 mol % oleic acid. Our major finding is that subdiffusive behavior over the 200 ns time scale is evident in systems at 340 K, with cholesterol diffusion being enhanced with increased oleic acid. Importantly, cholesterol and other species diffuse faster when radial densities indicate nearest neighbors include more cholesterol. We also find that, with the addition of oleic acid, the bilayer midplane and interfacial densities are reduced and there is a 3% decrease in total thickness occurring mostly near the hydrophilic interface at 300 K with reduced overall density at 340 K. Increased interdigitation occurs independent of oleic acid with a temperature increase. Slight ordering of the long non-hydroxy fatty acid of the ceramide occurs near the hydrophilic interface as a function of the oleic acid concentration, but no significant impact on hydrogen bonding is seen in the chosen oleic acid concentrations.
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Affiliation(s)
- Matthew I Hoopes
- Biophysics Graduate Group, University of California, Davis, California 95616, USA
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Ghosh J, Faller R. Comparing the density of states of binary Lennard-Jones glasses in bulk and film. J Chem Phys 2008; 128:124509. [DOI: 10.1063/1.2883697] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ghosh J, Faller R. State point dependence of systematically coarse–grained potentials. MOLECULAR SIMULATION 2007. [DOI: 10.1080/08927020701275050] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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