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Fabricating Optical-quality Glass Surfaces to Study Macrophage Fusion
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Published on: March 14, 2018

Communication: An obligatory glass surface.

S Ashtekar1, D Nguyen, K Zhao

  • 1Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana, Illinois 61801, USA.

The Journal of Chemical Physics
|October 16, 2012
PubMed
Summary
This summary is machine-generated.

Glass surfaces can remain stable above bulk crystallization temperatures. This study shows a cerium-based glass surface retains its amorphous structure and dynamics even after bulk crystallization and annealing.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Surface Science

Background:

  • Glass dynamics are typically faster at surfaces than in the bulk.
  • This surface effect allows glasses to potentially achieve more stable states.
  • The behavior of glass surfaces at elevated temperatures, especially near crystallization points, is not fully understood.

Purpose of the Study:

  • To investigate the stability of glass surfaces at temperatures exceeding bulk crystallization.
  • To examine the surface dynamics of a cerium-based glass in real-time across different temperature regimes.
  • To determine if glass surfaces can maintain their amorphous state above the bulk melting point.

Main Methods:

  • Real-time imaging with sub-nanometer resolution.
  • Observation of two-state surface dynamics.
  • In-situ temperature control from glassy to above crystallization temperatures.
  • Annealing experiments up to the bulk melting temperature.

Main Results:

  • The cerium-based glass surface remained amorphous even after the bulk crystallized.
  • Surface retained non-crystalline structure and two-state dynamics of cooperatively rearranging regions after annealing.
  • Heat-annealed cooperatively rearranging regions were larger, indicating surface aging.
  • Surface dynamics showed weak temperature dependence, unlike bulk behavior near the glass transition temperature (Tg).

Conclusions:

  • Glass surfaces can exhibit enhanced stability and resist crystallization at temperatures where the bulk material transforms.
  • The observed surface aging and weak temperature dependence suggest unique surface dynamics distinct from bulk behavior.
  • These findings challenge conventional understanding of glass behavior at elevated temperatures and highlight the potential for stable glassy surfaces.