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Convectively Assembled Monolayers of Colloidal Cubes : Evidence of Optimal Packings

Convectively Assembled Monolayers of Colloidal Cubes : Evidence of Optimal Packings

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MEIJER, Janne-Mieke, Vera MEESTER, Fabian HAGEMANS, Henk N. W. LEKKERKERKER, Albert P. PHILIPSE, Andrei V. PETUKHOV, 2019. Convectively Assembled Monolayers of Colloidal Cubes : Evidence of Optimal Packings. In: Langmuir. 35(14), pp. 4946-4955. ISSN 0743-7463. eISSN 1520-5827. Available under: doi: 10.1021/acs.langmuir.8b04330

@article{Meijer2019-04-09Conve-45761, title={Convectively Assembled Monolayers of Colloidal Cubes : Evidence of Optimal Packings}, year={2019}, doi={10.1021/acs.langmuir.8b04330}, number={14}, volume={35}, issn={0743-7463}, journal={Langmuir}, pages={4946--4955}, author={Meijer, Janne-Mieke and Meester, Vera and Hagemans, Fabian and Lekkerkerker, Henk N. W. and Philipse, Albert P. and Petukhov, Andrei V.} }

Meijer, Janne-Mieke 2019-04-09 Lekkerkerker, Henk N. W. Hagemans, Fabian Petukhov, Andrei V. 2019-05-03T10:50:39Z Philipse, Albert P. Hagemans, Fabian Philipse, Albert P. Convectively Assembled Monolayers of Colloidal Cubes : Evidence of Optimal Packings Petukhov, Andrei V. Meijer, Janne-Mieke We employ a system of cubic colloids with rounded corners to study the close-packed monolayers that form via convective assembly. We show that by controlled solvent evaporation large densely packed monolayers of colloidal cubes are obtained. Using scanning electron microscopy and particle-tracking algorithms, we investigate the local order in detail and show that the obtained monolayers possess their predicted close-packed optimal packings, the Λ<sub>0</sub>-lattice and the Λ<sub>1</sub>-lattice, as well as the simple square-lattice and disordered packings. We further show that shape details of the cube corners are important for the final packing symmetry, where the frequency of the Λ<sub>1</sub>-lattice increases with decreasing roundness of the corners, whereas the frequency of the Λ<sub>0</sub>-lattice is unaffected. The formation of both optimal packings is found to be a consequence of the out-of-equilibrium formation process, which leads to small shifts in rows of cubes, thereby transforming the Λ<sub>1</sub>-lattice into the Λ<sub>0</sub>-lattice. eng 2019-05-03T10:50:39Z Meester, Vera Meester, Vera Lekkerkerker, Henk N. W.

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