Quantifying disorder in colloidal films spin-coated onto patterned substrates
| Autor: | Wenceslao González-Viñas, Kristin M. Poduska, Sergio Ardanza-Trevijano, Anand Yethiraj, Raheema Aslam |
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| Rok vydání: | 2017 |
| Předmět: |
Surface (mathematics)
Order-disorder Spin coating Materials science Persistent homology Nanotechnology 02 engineering and technology spin-coating 021001 nanoscience & nanotechnology 01 natural sciences Image analysis Condensed Matter::Soft Condensed Matter Colloid Minkowski metrics Chemical physics 0103 physical sciences Colloids 010306 general physics 0210 nano-technology Axial symmetry Analysis method Spin-½ |
| Zdroj: | Dadun. Depósito Académico Digital de la Universidad de Navarra instname |
| ISSN: | 2470-0053 2470-0045 |
| DOI: | 10.1103/physreve.95.032607 |
| Popis: | Polycrystals of thin colloidal deposits, with thickness controlled by spin-coating speed, exhibit axial symmetry with local 4-fold and 6-fold symmetric structures, termed orientationally correlated polycrystals (OCPs). While spin-coating is a very facile technique for producing large-area colloidal deposits, the axial symmetry prevents us from achieving true long-range order. To obtain true long-range order, we break this axial symmetry by introducing a patterned surface topography and thus eliminate the OCP character. We then examine symmetry- independent methods to quantify order in these disordered colloidal deposits. We find that all the information in the bond-orientational order parameters is well captured by persistent homology analysis methods that only use the centers of the particles as input data. It is expected that these methods will prove useful in characterizing other disordered structures. |
| Databáze: | OpenAIRE |
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