Self-assembly of Colloidal Cubes Induced by Sedimentation
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In this chapter the sedimentation of hollow silica cubes into dense packings is investigated. The effect of the Debye screening length on the close-packed structures as well as on sedimentation behavior is studied. The sediment structures are characterized in detail using small angle X-ray scattering. Remarkably, despite their rapid sedimentation the cubes order into a dense structure with both translational and orientational ordering. The structure consists of layers of cubes aligned against the capillary walls. The layers possess rhombic intra-layer ordering described by the Λ1-lattice as predicted for 2D rounded cube structures and are stacked with an ABA type stacking.
KeywordsBragg Peak Single Crystal Structure Face Centered Cubic Rounded Corner Hollow Silica
Antara Pal is thanked for useful discussions and contributions to the data analysis. The Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) is acknowledged for the provided beam-time. Anke Leferink op Reinink and Joost Wolters are thanked for their assistance during the SAXS measurements. The whole DUBBLE team and especially Guiseppe Portale and Daniel Hermida Merino are thanked for their excellent support during the SAXS measurements.
- 5.L. Rossi, Colloidal Superballs, Ph.D. Thesis, Utrecht University, 2012Google Scholar
- 8.D.M.E. Thies-Weesie, Sedimentation and Liquid Permeation of Inorganic Colloids, Ph.D. Thesis, Utrecht University, 1995Google Scholar
- 10.A. Petukhov, J. Thijssen, D. t Hart, A. Imhof, A. van Blaaderen, I. Dolbnya, A. Snigirev, A. Moussaid, I. Snigireva, J. Appl. Cryst. 39, 137–144 (2006)Google Scholar
- 11.J.H.J. Thijssen, A.V. Petukhov, D.C.‘t Hart, A. Imhof, C.H.M. van der Werf, R.E.I. Schropp, A. van Blaaderen, Adv. Mater. 18, 1662–1666 (2006)Google Scholar
- 19.A. Guinier, X-Ray Diffraction in Crystal, Imperfect Crystals, and Amorphous Bodies (Dover, New York, 1994)Google Scholar