Age and structure of a model vapour-deposited glass

Reid, Daniel; Lyubimov, Ivan; Ediger, M. D.; Pablo, Juan J. de

doi:10.1038/ncomms13062

Cited by 44 publications

(58 citation statements)

References 37 publications

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“…The discrepancies between the inherent structure energies of this work and the ones shown in Ref. [34] come from the fact that in the previous work energies were rescaled to compare configurations with exactly the same portion of type-1 particles in the bulk. The temperature is fixed using a Nosé-Hoover thermostat [56] with a temperature damping parameter 100∆t, where the time step is here ∆t = 0.005.…”

Section: Discussionmentioning

confidence: 61%

“…8). In this region the density and relative concentration of the two particle types are both constant [34], allowing boundary effects to be avoided. The displacement of the center of mass of the whole sample is removed.…”

Section: Sample Preparation Protocolmentioning

confidence: 99%

“…We show the results for the T * of each sample in Fig. 6c as function of their inherent structure energy, which is correlated with the cooling or deposition rate and is a proxy for glass stability [34,35]. In spite of the large spread of the data points, we find that the values of T * are correlated (the linear correlation coefficient is 0.67) with the logarithm of the inherent structure energies of the samples, suggesting that the threshold temperature T * decreases with the inherent structure energy (roughly exponentially).…”

Section: Temperature Threshold and Inherent Structure Energymentioning

confidence: 99%

“…Note also that the films considered in this study have fixed thickness (the same used in Ref. [34]), so the dependence of the results on films' thickness is not addressed here and left for future work.arXiv:1709.04930v4 [cond-mat.soft] …”

mentioning

confidence: 99%

“…[34]. We study these films due to their experimental relevance and the fact that they have been well characterized by previous work [34,35].…”

mentioning

confidence: 99%

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Low-temperature anomalies of a vapor deposited glass

Seoane

Reid

Pablo

et al. 2018

Phys. Rev. Materials

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We investigate the low temperature properties of two-dimensional Lennard-Jones glass films, prepared in silico both by liquid cooling and by physical vapor deposition. We identify deep in the solid phase a crossover temperature T * , at which slow dynamics and enhanced heterogeneity emerge. Around T * , localized defects become visible, leading to vibrational anomalies as compared to standard solids. We find that on average, T * decreases in samples with lower inherent structure energy, suggesting that such anomalies will be suppressed in ultra-stable glass films, prepared both by very slow liquid cooling and vapor deposition.Low-temperature crystalline solids are usually described in terms of harmonic vibrations around a perfect periodic lattice (phonons). Within this framework, defects such as vacancies and dislocations can be treated as small perturbations. This description breaks down for amorphous solids such as glasses, foams, emulsions, plastics, colloids, granular materials, bacterial colonies, and tissues [1][2][3][4][5][6][7]. In these systems, the identification of "defects" becomes challenging because the solid ground state is strongly disordered. As a consequence, amorphous solids display many universal anomalies with respect to crystals. Examples are the so-called Boson Peak, an excess of low-energy vibrational modes [8]; the anomalous scaling of heat capacity and thermal conductivity with temperature [9,10]; the irreversible plastic response to arbitrarily small perturbations [1,3,4,11]; and highly cooperative relaxation dynamics, contributing to the socalled β-processes [12][13][14].These anomalies have been widely reported in amorphous solids of very different nature. Interestingly, recent experimental work has shown that by preparing glasses through a process of physical vapor deposition, one can produce ultra-stable states that lie deep in the free energy landscape [15]. Compared to their liquid-cooled counterparts, vapor-deposited glasses show higher density [16] and kinetic stability [15,17]. When these ultra-stable glasses are studied at very low temperatures, it is found that the anomalies characteristic of amorphous solids are strongly supressed [18][19][20][21][22].Many theoretical approaches to this problem are based on the study of the potential energy landscape of glassforming particle systems [13,[23][24][25][26][27][28]. These studies have suggested that glass anomalies can be interpreted in terms of glass states being not well-defined energy minima, but structured metabasins containing a collection of sub-basins separated by barriers of variable size [29,30], see Fig. 1. In particular, recent work [31][32][33] has identified a set of simple observables (the mean square displacement between identical "clones" of the original system) that allows one to detect easily the development of a structure of sub-basins inside a glass metabasin.In this work, using the methods of [31-33], we explore in silico the potential energy landscape of binary Lennard-Jones glass films prepared through tw...

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Section: Discussionmentioning

confidence: 61%

Section: Sample Preparation Protocolmentioning

confidence: 99%

Section: Temperature Threshold and Inherent Structure Energymentioning

confidence: 99%

mentioning

confidence: 99%

“…[34]. We study these films due to their experimental relevance and the fact that they have been well characterized by previous work [34,35].…”

mentioning

confidence: 99%

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Low-temperature anomalies of a vapor deposited glass

Seoane

Reid

Pablo

et al. 2018

Phys. Rev. Materials

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Metallic Glassy Thin Films: Perspective on Mechanical, Magnetic, Biomedical, and Optical Properties

et al. 2019

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The recent progress of metallic glassy thin films (MGTFs) in mechanical, magnetic, biomedical, and optical fields is briefly summarized. The key factors that control the mechanical behavior of MGTFs are outlined on the basis of recent theoretical and experimental works. Special MGTFs with enhanced mechanical property like nano‐structured MGTFs, multi‐layer MGTFs, and ultra‐stable MGTFs are introduced in detail. The magnetic anisotropy and magnetic impedance (MI) effect of MGTFs are discussed. In addition, MGTFs are recently found playing an important role in some new areas, for example, for biomedical and optical components. The availability of two‐dimensional MGTFs stimulates comprehensive studies in those fields, which enhance the understanding of the correlation of structure and their mechanical, magnetic, biomedical, and optical properties, and develop the designing strategy for engineers.

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Nanodiamond Glass with Rubber Bond in Natural Rubber

Kawahara

Gannoruwa

Nakajima

et al. 2020

Adv Funct Materials

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Nanodiamond glass is an amorphous solid consisting of nanodiamond as a nanoparticle. The several-nm-space between the nanodiamonds is filled with a medium that reversibly deforms and recovers. Hence, nanodiamonds linked in the medium are arranged in several-nm intervals. To prepare the nanodiamond glass, nanodiamonds are dispersed as inorganic nanoparticles with highly reactive functional groups into natural rubber as an incompressible medium exhibiting reversible deformation and recovery. Nanodiamond glass can be distinguished from nanodiamond-filled rubber, which exhibits ordinary entropic elasticity. Natural rubber particles dispersed in water (i.e., latex) are used to prepare nanodiamond glass, chemically embed nanodiamonds onto the surface of the natural rubber particles, and subsequently attach the surfaces together to achieve close packing of the nanodiamonds. Increasing the modulus of natural rubber constrained in the nanospaces ensures the energetic elasticity of nanodiamond glass. This work demonstrates that nanodiamond glass with energetic elasticity is a new research field.

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Age and structure of a model vapour-deposited glass

Cited by 44 publications

References 37 publications

Low-temperature anomalies of a vapor deposited glass

Low-temperature anomalies of a vapor deposited glass

Metallic Glassy Thin Films: Perspective on Mechanical, Magnetic, Biomedical, and Optical Properties

Nanodiamond Glass with Rubber Bond in Natural Rubber

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