تقرير
Molecular dynamics simulation of the capillary leveling of a glass-forming liquid
| العنوان: | Molecular dynamics simulation of the capillary leveling of a glass-forming liquid |
|---|---|
| المؤلفون: | Tanis, Ioannis, Karatasos, Kostas, Salez, Thomas |
| سنة النشر: | 2018 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Soft Condensed Matter, Condensed Matter - Disordered Systems and Neural Networks, Condensed Matter - Materials Science, Condensed Matter - Statistical Mechanics, Physics - Classical Physics |
| الوصف: | Motivated by recent experimental studies probing i) the existence of a mobile layer at the free surface of glasses, and ii) the capillary leveling of polymer nanofilms, we study the evolution of square-wave patterns at the free surface of a generic glass-forming binary Lennard-Jones mixture over a wide temperature range, by means of molecular dynamics simulations. The pattern's amplitude is monitored and the associated decay rate is extracted. The evolution of the latter as a function of temperature exhibits a crossover between two distinct behaviours, over a temperature range typically bounded by the glass-transition temperature and the mode-coupling critical temperature. Layer-resolved analysis of the film particles' mean-squared displacements further shows that diffusion at the surface is considerably faster than in the bulk, below the glass-transition temperature. The diffusion coefficient of the surface particles is larger than its bulk counterpart by a factor that reaches 105 at the lowest temperature studied. This factor decreases upon heating, in agreement with recent experimental studies. |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1810.13179 |
| رقم الأكسشن: | edsarx.1810.13179 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |