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Featured researches published by D. van der Beek.


Philosophical Transactions of the Royal Society A | 2006

Gelation versus liquid crystal phase transitions in suspensions of plate-like particles.

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

Columnar liquid crystals of gibbsite platelets as templates for the generation of ordered silica structures

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

Liquid crystal phases of charged colloidal platelets.

D. van der Beek; Henk N. W. Lekkerkerker


Physical Review Letters | 2006

Isotropic-nematic interface and wetting in suspensions of colloidal platelets

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

Magnetic-field-induced orientational order in the isotropic phase of hard colloidal platelets

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

Nematic ordering vs. gelation in suspensions of charged platelets

D. van der Beek; Henk N. W. Lekkerkerker


Langmuir | 2005

Sedimentation and phase transitions of colloidal gibbsite platelets.

J.E.G.J. Wijnhoven; D.D. van 't Zand; D. van der Beek; Henk N. W. Lekkerkerker


Physical Review Letters | 2005

Observation of a Hexatic Columnar Liquid Crystal of Polydisperse Colloidal Disks

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

Influence of a magnetic field on the nematic phase of hard colloidal platelets

D. van der Beek; Patrick Davidson; H. H. Wensink; G. J. Vroege; Henk N. W. Lekkerkerker


European Physical Journal E | 2005

Evidence of the hexagonal columnar liquid-crystal phase of hard colloidal platelets by high-resolution SAXS

D. van der Beek; Andrei V. Petukhov; S.M. Oversteegen; G. J. Vroege; Henk N. W. Lekkerkerker

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Andrei V. Petukhov

Eindhoven University of Technology

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