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Heating amorphous solid water causes micropore collapse and glass transition. These processes influence each other, with faster dynamics observed when both occur simultaneously. The glass transition primarily shows slow diffusive behavior.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Vapor-deposited amorphous ice (amorphous solid water) undergoes structural changes upon heating.
  • Micropore collapse and glass transition are key transformations occurring within specific temperature ranges.

Purpose of the Study:

  • To differentiate and study the dynamics of micropore collapse and glass transition in amorphous solid water.
  • To investigate the interplay between micropore collapse and glass transition during heating cycles.

Main Methods:

  • Small-angle X-ray scattering (SAXS) to monitor micropore collapse.
  • X-ray photon correlation spectroscopy (XPCS) to study combined dynamics.
  • Heating and cooling cycles of amorphous solid water samples.

Main Results:

  • Micropore collapse occurs between 100-145 K, with glass transition above 120 K.
  • Heating a second time shows pore collapse only near the glass transition temperature (Tg).
  • Both diffusive and ballistic processes contribute to pore collapse dynamics, with accelerated rates when collapse and transition co-occur.

Conclusions:

  • Micropore collapse and glass transition are coupled processes that influence each other's dynamics.
  • The glass transition in amorphous solid water is characterized by slow diffusive motion.
  • Observed dynamics align with previous studies on amorphous solid water in different forms.