Measurements of growing surface tension of amorphous–amorphous interfaces on approaching the colloidal glass transition

Ganapathi, Divya; Nagamanasa, K. Hima; Sood, Anil K.; Ganapathy, Rajesh

doi:10.1038/s41467-018-02836-6

Cited by 22 publications

(24 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This discrepancy that arises at low temperatures is another indication that the dynamic lengths in terms of the absolute displacements of the monomers depart from the structural behavior, showing a greater increase. 6,33,34,49 On the other hand, the relative displacements, ξK, show a softer increase, as found in some structural lengths. 18,19 The decoupling of both length at about T = 0.7 could be an indication of a change in the relaxation mechanism, and this will be discussed in more detail later.…”

Section: The Journal Of Chemical Physicsmentioning

confidence: 52%

Static and dynamic correlation lengths in supercooled polymers

Balbuena

Gianetti

Soulé

2019

The Journal of Chemical Physics

View full text Add to dashboard Cite

A key point to understand the glass transition is the relationship between structural and dynamic behavior experienced by a glass former when it approaches Tg. In this work, the relaxation in a simple bead-spring polymer system in the supercooled regime near its glass transition temperature was investigated with molecular dynamic simulations. We develop a new manner to look at the dynamic length scales in a supercooled polymeric system, focusing on correlated motion of particles in an isoconfigurational ensemble (that is, associated with the structure), as measured by Pearson's correlation coefficient. We found that while the usual dynamic four-point correlation length deviates from the structural (mosaic or point-to-set) length scale at low temperatures, Pearson's length behaves similarly to the static length in the whole temperature range. The results lead to a consensus of similar scaling of structural and dynamical length scales, reinforcing the idea of the theories of Adam-Gibbs and random first order transition.

show abstract

Section: The Journal Of Chemical Physicsmentioning

confidence: 52%

Static and dynamic correlation lengths in supercooled polymers

Balbuena

Gianetti

Soulé

2019

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…To understand the effect of particle pinning on the local dynamics in model glass-forming liquids we follow the method developed in [32] and later used in [33,34]. The idea is to quantify the effect of pinned particles (small pinning fraction ) on the local static order present in the system.…”

Section: Resultsmentioning

confidence: 99%

Soft-Pinning: Experimental Validation of Static Correlations in Supercooled Molecular Glass-forming Liquids

Das,

Bhowmik,

Puthirath

et al. 2021

Preprint

View full text Add to dashboard Cite

Enormous enhancement in the viscosity of a liquid near its glass transition is generally connected to the growing many-body static correlations near the transition, often coined as 'amorphous ordering'. Estimating the length scales of such correlations in different glass-forming liquids is highly important to unravel the physics of glass formation. Experiments on molecular glass-forming liquids become pivotal in this scenario as the viscosity grows several folds (∼ 10 14 ), simulations or colloidal glass experiments fail to access the long-time scales required. Here we design an experiment to extract the static length scales in molecular liquids using dilute amounts of another large molecule as a pinning site. Results from dielectric relaxation experiments on supercooled glycerol with different pinning concentrations of sorbitol and the simulations on a few model glass-forming liquids with pinning sites indicates the robustness of the proposed method, opening a plethora of opportunity to study the physics of other glass-forming liquids.

show abstract

“…As alluded to above, the RFOT theory naturally explains the increase in the free energy barrier near the glass transition, which is due to the emergence of a growing length scale in which dynamics of the particles are highly correlated [1,7,52]. In the RFOT the effective free energy barrier is characterized by a diverging length scale associated with the amorphous order [26,29,53,54] or the correlated dynamics [55][56][57][58]. According to the RFOT, therefore, regardless of the fragility of liquids, a significant increase in τ α should be universally described in terms of the growth of length scales.…”

Section: Introductionmentioning

confidence: 97%

Fragile-to-strong crossover, growing length scales, and dynamic heterogeneity in Wigner glasses

et al. 2020

View full text Add to dashboard Cite

Colloidal particles, which are ubiquitous, have become ideal testing grounds for the structural glass transition (SGT) theories. In these systems glassy behavior is manifested as the density of the particles is increased. Thus, soft colloidal particles with varying degree of softness capture diverse glass forming properties, observed normally in molecular glasses. By performing Brownian dynamics simulations for a binary mixture of micron-sized charged colloidal suspensions, known to form Wigner glasses, we show that by tuning the softness of the interaction potential, achievable by changing the monovalent salt concentration, there is a continuous transition between fragile to strong behavior. Remarkably, this is found in a system where the well characterized interaction potential between the colloidal particles is isotropic. We also show that the predictions of the random first order transition (RFOT) theory quantitatively describes the universal features such as the growing correlation length,where φK , the analogue of the Kauzmann temperature, depends on the salt concentration. As anticipated by the RFOT predictions, we establish a causal relationship between the growing correlation length and a steep increase in the relaxation time and dynamic heterogeneity as the system is compressed. The broad range of fragility observed in Wigner glasses, which can be induced by merely changing the salt concentration, is used to draw analogies with molecular and polymer glasses. The large variations in the fragility is found only when the temperature dependence of the viscosity is examined for a large class of diverse glass forming materials. In sharp contrast, this is vividly illustrated in a single system that can be experimentally probed. Our work also shows that the RFOT predictions are accurate in describing the dynamics over the entire density range, regardless of the fragility of the glasses, implying that the physics describing the structural glass transition is universal. arXiv:1909.03463v1 [cond-mat.soft]

show abstract

Measurements of growing surface tension of amorphous–amorphous interfaces on approaching the colloidal glass transition

Cited by 22 publications

References 49 publications

Static and dynamic correlation lengths in supercooled polymers

Static and dynamic correlation lengths in supercooled polymers

Soft-Pinning: Experimental Validation of Static Correlations in Supercooled Molecular Glass-forming Liquids

Fragile-to-strong crossover, growing length scales, and dynamic heterogeneity in Wigner glasses

Contact Info

Product

Resources

About