D. van der Beek
Utrecht University
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Publication
Featured researches published by D. van der Beek.
Philosophical Transactions of the Royal Society A | 2006
Maurice C. D. Mourad; J.E.G.J. Wijnhoven; D.D. van 't Zand; D. van der Beek; Henk N. W. Lekkerkerker
Gelation is a common effect in aqueous suspensions of charged colloidal clay platelets at concentrations as low as 1 wt%. However, in systems of charged gibbsite [Al(OH)3] platelets, gelation can be delayed to concentrations as high as 50 wt% depending on the ionic strength. We investigated the phase behaviour of this system approaching the state of gelation in the delicate region between attractive and repulsive states that originate from competition between Coulomb repulsion and van der Waals attraction. As a function of the ionic strength, isotropic–nematic, nematic–columnar and isotropic–columnar phase separations were observed. Moreover, compression by gravitational forces allowed us to observe phase separation that is arrested by gelation in the homogeneous suspensions.
Journal of Materials Chemistry | 2008
Maurice C. D. Mourad; E. Groeneveld; P.J. de Lange; Ch. Vonk; D. van der Beek; Henk N. W. Lekkerkerker
In this paper we describe the use of columnar liquid crystals of silica coated colloidal gibbsite platelets as templates for the generation of ordered silica structures. The colloidal liquid crystal phases can be formed in a few hours by modest centrifugation forces (100–200g). Base catalysed hydrolysis of tetraethoxysilane (TEOS) is used to deposit silica in the space between the silica coated gibbsite particles. The size of the gibbsite platelets is varied between 200 and 500 nm and the thickness of the silica coating between 5 and 15 nm making the system a very versatile templating material. Acid leaching is used to selectively remove the gibbsite material.
Langmuir | 2004
D. van der Beek; Henk N. W. Lekkerkerker
Physical Review Letters | 2006
D. van der Beek; Hendrik Reich; P. P. A. M. van der Schoot; Marjolein Dijkstra; Tanja Schilling; R. Vink; Matthias Schmidt; R.H.H.G. van Roij; Henk N. W. Lekkerkerker
Physical Review E | 2006
D. van der Beek; Andrei V. Petukhov; Patrick Davidson; J. Ferré; J. P. Jamet; H. H. Wensink; G. J. Vroege; Wim Bras; Henk N. W. Lekkerkerker
EPL | 2003
D. van der Beek; Henk N. W. Lekkerkerker
Langmuir | 2005
J.E.G.J. Wijnhoven; D.D. van 't Zand; D. van der Beek; Henk N. W. Lekkerkerker
Physical Review Letters | 2005
Andrei V. Petukhov; D. van der Beek; Roel P. A. Dullens; I. P. Dolbnya; G. J. Vroege; Henk N. W. Lekkerkerker
Physical Review E | 2008
D. van der Beek; Patrick Davidson; H. H. Wensink; G. J. Vroege; Henk N. W. Lekkerkerker
European Physical Journal E | 2005
D. van der Beek; Andrei V. Petukhov; S.M. Oversteegen; G. J. Vroege; Henk N. W. Lekkerkerker