Surface mobility gradient and emergent facilitation in glassy films

Qiang Zhai; Xin Yuan Gao; Chun Shing Lee; Chin Yuan Ong; Ke Yan; Hai Yao Deng; Sen Yang; Chi Hang Lam

doi:10.1039/d4sm00221k

Surface mobility gradient and emergent facilitation in glassy films

Qiang Zhai, Xin Yuan Gao, Chun Shing Lee, Chin Yuan Ong, Ke Yan, Hai Yao Deng, Sen Yang, Chi Hang Lam

Research output: Journal article publication › Journal article › Academic research › peer-review

2 Citations (Scopus)

Abstract

Confining glassy polymers into films can substantially modify their local and film-averaged properties. We present a lattice model of film geometry with void-mediated facilitation behaviors but free from any elasticity effect. We analyze the spatially varying viscosity to delineate the transport properties of glassy films. The film mobility measurements reported by Yang et al., Science, 2010, 328, 1676 are successfully reproduced. The flow exhibits a crossover from a simple viscous flow to a surface-dominated regime as the temperature decreases. The propagation of a highly mobile front induced by the free surface is visualized in real space. Our approach provides a microscopic treatment of the observed glassy phenomena.

Original language	English
Pages (from-to)	4389-4394
Number of pages	6
Journal	Soft Matter
Volume	20
Issue number	22
DOIs	https://doi.org/10.1039/d4sm00221k
Publication status	Published - 9 May 2024

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics

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10.1039/d4sm00221k

http://hdl.handle.net/10397/107613

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abstract = "Confining glassy polymers into films can substantially modify their local and film-averaged properties. We present a lattice model of film geometry with void-mediated facilitation behaviors but free from any elasticity effect. We analyze the spatially varying viscosity to delineate the transport properties of glassy films. The film mobility measurements reported by Yang et al., Science, 2010, 328, 1676 are successfully reproduced. The flow exhibits a crossover from a simple viscous flow to a surface-dominated regime as the temperature decreases. The propagation of a highly mobile front induced by the free surface is visualized in real space. Our approach provides a microscopic treatment of the observed glassy phenomena.",

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AU - Zhai, Qiang

AU - Gao, Xin Yuan

AU - Lee, Chun Shing

AU - Ong, Chin Yuan

AU - Yan, Ke

AU - Deng, Hai Yao

AU - Yang, Sen

AU - Lam, Chi Hang

PY - 2024/5/9

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AB - Confining glassy polymers into films can substantially modify their local and film-averaged properties. We present a lattice model of film geometry with void-mediated facilitation behaviors but free from any elasticity effect. We analyze the spatially varying viscosity to delineate the transport properties of glassy films. The film mobility measurements reported by Yang et al., Science, 2010, 328, 1676 are successfully reproduced. The flow exhibits a crossover from a simple viscous flow to a surface-dominated regime as the temperature decreases. The propagation of a highly mobile front induced by the free surface is visualized in real space. Our approach provides a microscopic treatment of the observed glassy phenomena.

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Surface mobility gradient and emergent facilitation in glassy films

Abstract

ASJC Scopus subject areas

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