ArticleThe journal of physical chemistry letters2011
When the Heterogeneous Appears Homogeneous: Discrepant Measures of Heterogeneity in Single Molecule Observables.
Article in The journal of physical chemistry letters, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Single molecule demonstration of Debye-Stokes-Einstein breakdown in polystyrene near the glass transition temperature.Nature communications · 2022Article
- Comparing Microscopic and Macroscopic Dynamics in a Paradigmatic Model of Glass-Forming Molecular Liquid.International journal of molecular sciences · 2022Article
- Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy.Nature communications · 2018Article
- A surface-bound molecule that undergoes optically biased Brownian rotation.Nature nanotechnology · 2014Article
Corrections and comments
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Authors and funding
2 authors.
Funding
Abstract
Supercooled liquids demonstrate stretched exponential relaxations consistent with the presence of spatially heterogeneous dynamics. Many experimental results are consistent with this picture, but differences in experimental approach may lead to different conclusions about the degree of heterogeneity in a given system. Here, we investigate whether observables accessible with single molecule (SM) approaches are consistent with each other and with ensemble measurements. In particular, the distribution of rotational relaxation times, τ(c), obtained from SM measurements is compared with the stretching exponent determined from a quasi-ensemble treatment of the same data. It is shown that the time-limited trajectories typical of SM experiments can lead to a stretching exponent that suggests homogeneous dynamics even in the presence of heterogeneous dynamics. After correction for the time-limited trajectories, additional discrepancy remains between stretching exponents measured via SM experiments and ensemble techniques. The remaining difference is attributed to the limited dynamic range of the SM experiments.
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Registered trials
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