Abstract:
:Some two-dimensional liquid systems are theoretically predicted to have an anomalous phase transition due to unique intermolecular interactions, for example the first-order transition between two-dimensional high-density water and low-density amorphous ice. However, it has never been experimentally observed, to the best of our knowledge. Here we report an entropy-driven phase transition between a high-density liquid crystal and low-density crystalline solid, directly observed by scanning tunneling microscope in carbon monoxide adsorbed on Cu(111). Combined with first principle calculations, we find that repulsive dipole-dipole interactions between carbon monoxide molecules lead to unconventional thermodynamics. This finding of unconventional thermodynamics in two-dimensional carbon monoxide not only provides a platform to study the fundamental principles of anomalous phase transitions in two-dimensional liquids at the atomic scale, but may also help to design and develop more efficient copper-based catalysis.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Li W,Kong L,Feng B,Fu H,Li H,Zeng XC,Wu K,Chen Ldoi
10.1038/s41467-017-02634-6subject
Has Abstractpub_date
2018-01-15 00:00:00pages
198issue
1issn
2041-1723pii
10.1038/s41467-017-02634-6journal_volume
9pub_type
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