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Article Dans Une Revue Physica B: Condensed Matter Année : 2021

Dewetting Temperatures of Prefrozen and Grafted Layers in Solid Ultrathin Films Viewed as Melt-Memory Effects

Résumé

Undercooled phase exists behind glass phase with superheated medium-range order between Tg and Tn+ > Tm. The ordered volume fraction stays equal to the percolation threshold F = 0.15 of broken bonds up to Tn+. The difference DTg between Tg(bulk) of films with thickness (h > h0) and Tg(h) of ultrathin films of thickness (h < h0) is a linear function of (h-ho). Dense layer with minimum thickness hr is grafted against substrate by isothermal annealing, rinsed to reduce film thickness below hr/F, and finally dewetted at Tg. Similar thickness prepared and annealed near Tm and heated above Tm contains residual crystallized layer dewetting at Tn+. The prefrozen layer reproduces the glassy grafted layer in a crystallized state up to Tn+. Melting heat and melting temperature Tm are linear functions of h for h < h0. Prefrozen layers are due to melt-memories leading to new scenarios of crystallization.
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Dates et versions

hal-02961002 , version 1 (08-10-2020)
hal-02961002 , version 2 (13-10-2020)
hal-02961002 , version 3 (03-11-2020)
hal-02961002 , version 4 (17-11-2020)
hal-02961002 , version 5 (06-02-2021)

Identifiants

Citer

Robert F Tournier, Michael I Ojovan. Dewetting Temperatures of Prefrozen and Grafted Layers in Solid Ultrathin Films Viewed as Melt-Memory Effects. Physica B: Condensed Matter, 2021, 611, pp.412796. ⟨10.1016/j.physb.2020.412796⟩. ⟨hal-02961002v5⟩
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