Crystalline shielding mitigates structural rearrangement and localizes memory in jammed systems under oscillatory shear

The nature of yield in amorphous materials under stress has yet to be fully elucidated. In particular, understanding how microscopic rearrangement gives rise to macroscopic structural and rheological signatures in disordered systems is vital for the prediction and characterization of yield and the study of how memory is stored in disordered materials. Here, we investigate the evolution of local structural homogeneity on an individual particle level in amorphous jammed two-dimensional (athermal) systems under oscillatory shear and relate this evolution to rearrangement, memory, and macroscale rheological measurements. We define the structural metric crystalline shielding, and show that it is predictive of rearrangement propensity and structural volatility of individual particles under shear. We use this metric to identify localized regions of the system in which the material’s memory of its preparation is preserved. Our results contribute to a growing understanding of how local structure relates to dynamic response and memory in disordered systems.

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Divergence of Voronoi Cell Anisotropy Vector: A Threshold-Free Characterization of Local Structure in Amorphous Materials

Physical Review Letters ◽

10.1103/physrevlett.116.088001 ◽

2016 ◽

Vol 116 (8) ◽

Cited By ~ 16

Author(s):

Jennifer M. Rieser ◽

Carl P. Goodrich ◽

Andrea J. Liu ◽

Douglas J. Durian

Keyword(s):

Local Structure ◽

Amorphous Materials ◽

Voronoi Cell ◽

Cell Anisotropy

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AEM analysis of crystallization in Ti-based amorphous alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100075142 ◽

1983 ◽

Vol 41 ◽

pp. 270-271

Author(s):

A.R. Pelton ◽

A.F. Marshall ◽

Y.S. Lee

Keyword(s):

Magnetic Properties ◽

Amorphous Alloys ◽

Amorphous Materials ◽

Isothermal Annealing ◽

Amorphous Matrix ◽

Nucleation And Growth ◽

Current Interest ◽

Amorphous Films ◽

Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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Algorithms for 3D Particles Characterization Using X-Ray Microtomography in Proppant Crush Test

Journal of Imaging ◽

10.3390/jimaging4110134 ◽

2018 ◽

Vol 4 (11) ◽

pp. 134 ◽

Cited By ~ 6

Author(s):

Ilia Safonov ◽

Ivan Yakimchuk ◽

Vladimir Abashkin

Keyword(s):

Laboratory Method ◽

X Ray ◽

Geometric Moments ◽

Before And After ◽

Statistical Hypotheses ◽

Image Processing Algorithms ◽

A New Technique ◽

Individual Particles ◽

Remarkable Advantage

We present image processing algorithms for a new technique of ceramic proppant crush resistance characterization. To obtain the images of the proppant material before and after the test we used X-ray microtomography. We propose a watershed-based unsupervised algorithm for segmentation of proppant particles, as well as a set of parameters for the characterization of 3D particle size, shape, and porosity. An effective approach based on central geometric moments is described. The approach is used for calculation of particles’ form factor, compactness, equivalent ellipsoid axes lengths, and lengths of projections to these axes. Obtained grain size distribution and crush resistance fit the results of conventional test measured by sieves. However, our technique has a remarkable advantage over traditional laboratory method since it allows to trace the destruction at the level of individual particles and their fragments; it grants to analyze morphological features of fines. We also provide an example describing how the approach can be used for verification of statistical hypotheses about the correlation between particles’ parameters and their crushing under load.

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Prediction and characterization of the stability enhancing effect of the Cherry-Tag™ in highly concentrated protein solutions by complex rheological measurements and MD simulations

International Journal of Pharmaceutics ◽

10.1016/j.ijpharm.2017.08.068 ◽

2017 ◽

Vol 531 (1) ◽

pp. 360-371 ◽

Cited By ~ 6

Author(s):

Pascal Baumann ◽

Marie-Therese Schermeyer ◽

Hannah Burghardt ◽

Cathrin Dürr ◽

Jonas Gärtner ◽

...

Keyword(s):

Md Simulations ◽

Protein Solutions ◽

Enhancing Effect ◽

Rheological Measurements ◽

The Stability

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Synthesis and Characterization of Sugarcane Bagasse Based Activated Carbon: Effect of Impregnation Ratio of ZnCl2

Journal of Nepal Chemical Society ◽

10.3126/jncs.v41i1.30490 ◽

2020 ◽

Vol 41 (1) ◽

pp. 74-79

Author(s):

Sahira Joshi ◽

Bishnu K.C.

Keyword(s):

Iodine Number ◽

Surface Area ◽

Sugarcane Bagasse ◽

Amorphous Materials ◽

Activated Carbons ◽

X Ray Diffraction ◽

Impregnation Ratio ◽

Methylene Blue Number ◽

Xrd Patterns

Series of activated carbons (ACs) have been prepared from Sugarcane bagasse powder by ZnCl2 activation at various impregnation ratios of ZnCl2 to Sugarcane bagasse powder of 0.25:1, 0.5:1, 1:1 and 2:1 by weight. Characteristics of the activated carbons (ACs) were determined by iodine number, methylene blue number, surface area, scanning electron microscopy (SEM) and x-ray diffraction. Iodine number (IN) indicated that, microporosity of the AC were increased with increasing impregnation ratio ZnCl2 to Sugarcane bagasse upto 1:1 then started to decrease. However, mesoporosity as well as surface area was increased progressively. The maximum value of iodine number (868 mg/g) was achieved in the AC prepared at impregnation ratio of ZnCl2 to sugarcane bagasse 1:1. SEM micrographs also show the presence of well developed pores on its surface of AC-1. The broad peaks in the XRD patterns indicated that, all the ACs is amorphous materials. From results, it is concluded that ZnCl2 concentration used in impregnation is effective for development of porosity and surface area of the AC prepared from Sugarcane bagasse.

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On Failure Modes and Strength Characterization of Brittle Disordered Materials under Uniaxial Compression and Tension

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.183-187.637 ◽

2000 ◽

Vol 183-187 ◽

pp. 637-642 ◽

Cited By ~ 5

Author(s):

Chun An Tang ◽

P. Lin ◽

H.Y. Liu ◽

Zheng Zhao Liang

Keyword(s):

Uniaxial Compression ◽

Failure Modes ◽

Disordered Materials ◽

Strength Characterization

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Disordered materials studied using neutron polarization analysis on the multi-detector spectrometer, D7

Journal of Applied Crystallography ◽

10.1107/s0021889808039162 ◽

2008 ◽

Vol 42 (1) ◽

pp. 69-84 ◽

Cited By ~ 104

Author(s):

J. R. Stewart ◽

P. P. Deen ◽

K. H. Andersen ◽

H. Schober ◽

J.-F. Barthélémy ◽

...

Keyword(s):

Cross Sections ◽

Disordered Systems ◽

Disordered Materials ◽

Polarization Analysis ◽

Neutron Spectrometer ◽

Neutron Polarization ◽

Unambiguous Determination ◽

Diffraction Patterns ◽

Scattering Cross Sections

The technique of longitudinal neutron polarization analysis on a multi-detector neutron spectrometer (so-called `xyz'-polarization analysis) is presented. This technique allows the simultaneous and unambiguous determination of the nuclear, magnetic and nuclear spin-incoherent scattering cross sections as a function of both momentum transfer and energy transfer. The implementation ofxyz-polarization analysis on the recently upgraded D7 spectrometer at the Institut Laue–Langevin in Grenoble is described. Several examples of neutron polarization analysis studies of disordered systems on D7 are given, illustrating the valuable information which can be retrieved from the analysis of neutron diffraction patterns between the Bragg peaks.

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General Analytical Schemes for the Characterization of Pectin-Based Edible Gelled Systems

The Scientific World JOURNAL ◽

10.1100/2012/967407 ◽

2012 ◽

Vol 2012 ◽

pp. 1-12 ◽

Cited By ~ 4

Author(s):

Maryam Haghighi ◽

Karamatollah Rezaei

Keyword(s):

Image Analysis ◽

Three Dimensional ◽

Analytical Techniques ◽

Physicochemical Analysis ◽

Visual Observation ◽

Scientific Data ◽

Rheological Measurement ◽

Rheological Measurements ◽

Analytical Approaches

Pectin-based gelled systems have gained increasing attention for the design of newly developed food products. For this reason, the characterization of such formulas is a necessity in order to present scientific data and to introduce an appropriate finished product to the industry. Various analytical techniques are available for the evaluation of the systems formulated on the basis of pectin and the designed gel. In this paper, general analytical approaches for the characterization of pectin-based gelled systems were categorized into several subsections including physicochemical analysis, visual observation, textural/rheological measurement, microstructural image characterization, and psychorheological evaluation. Three-dimensional trials to assess correlations among microstructure, texture, and taste were also discussed. Practical examples of advanced objective techniques including experimental setups for small and large deformation rheological measurements and microstructural image analysis were presented in more details.

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