Convectively assembled monolayers of colloidal cubes: evidence of optimal packings

Janne Mieke Meijer (Corresponding author), Vera Meester, Fabian Hagemans, H.N.W. Lekkerkerker, Albert P. Philipse, Andrei V. Petukhov

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Abstract

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 0-lattice and the Λ 1-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 1-lattice increases with decreasing roundness of the corners, whereas the frequency of the Λ 0-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 1-lattice into the Λ 0-lattice.

Original languageEnglish
Pages (from-to)4946-4955
Number of pages10
JournalLangmuir
Volume35
Issue number14
DOIs
Publication statusPublished - 9 Apr 2019

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Monolayers
Colloids
Evaporation
Scanning electron microscopy
colloids
assembly
evaporation
scanning electron microscopy
shift
symmetry

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Meijer, J. M., Meester, V., Hagemans, F., Lekkerkerker, H. N. W., Philipse, A. P., & Petukhov, A. V. (2019). Convectively assembled monolayers of colloidal cubes: evidence of optimal packings. Langmuir, 35(14), 4946-4955. https://doi.org/10.1021/acs.langmuir.8b04330
Meijer, Janne Mieke ; Meester, Vera ; Hagemans, Fabian ; Lekkerkerker, H.N.W. ; Philipse, Albert P. ; Petukhov, Andrei V. / Convectively assembled monolayers of colloidal cubes : evidence of optimal packings. In: Langmuir. 2019 ; Vol. 35, No. 14. pp. 4946-4955.
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Meijer, JM, Meester, V, Hagemans, F, Lekkerkerker, HNW, Philipse, AP & Petukhov, AV 2019, 'Convectively assembled monolayers of colloidal cubes: evidence of optimal packings', Langmuir, vol. 35, no. 14, pp. 4946-4955. https://doi.org/10.1021/acs.langmuir.8b04330

Convectively assembled monolayers of colloidal cubes : evidence of optimal packings. / Meijer, Janne Mieke (Corresponding author); Meester, Vera; Hagemans, Fabian; Lekkerkerker, H.N.W.; Philipse, Albert P.; Petukhov, Andrei V.

In: Langmuir, Vol. 35, No. 14, 09.04.2019, p. 4946-4955.

Research output: Contribution to journalArticleAcademicpeer-review

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Meijer JM, Meester V, Hagemans F, Lekkerkerker HNW, Philipse AP, Petukhov AV. Convectively assembled monolayers of colloidal cubes: evidence of optimal packings. Langmuir. 2019 Apr 9;35(14):4946-4955. https://doi.org/10.1021/acs.langmuir.8b04330