Synthesis of fluorescent silica-coated gibbsite platelets

Vonk, Chantal; Oversteegen, S. M.; Wijnhoven, Judith E. G. J.

doi:10.1016/j.jcis.2005.02.022

Cited by 10 publications

(8 citation statements)

References 23 publications

(32 reference statements)

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“…Unfortunately, the problem of aggregation was much more pronounced for the coating of rods. In the literature, aggregation is attributed to the presence of APS molecules on the surface of the silica particles . These decrease the stabilizing negative surface charge of the silica layer by its basic amino groups, resulting in less stable particles.…”

Section: Resultsmentioning

confidence: 99%

Colloidal Silica Rods: Material Properties and Fluorescent Labeling

Kuijk

Imhof

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et al. 2014

Part & Part Syst Charact

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In this paper, the characterization and fluorescent labeling of silica rods are reported. These rods are synthesized following a recently reported method. Material properties of the silica rods measured with NMR, elemental analysis, TGA, and porosimetry are compared with those of well‐established Stöber silica spheres. Additionally, silica rods are made suitable for quantitative real‐space studies by confocal microscopy. Several methods of fluorescent labeling to prepare rods with different fluorescent patterning, ranging from uniform fluorescence levels to gradients from one rod‐end to the other, and even patterns of several colors are presented and discussed.

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Section: Resultsmentioning

confidence: 99%

Colloidal Silica Rods: Material Properties and Fluorescent Labeling

Kuijk

Imhof

Verkuijlen³

et al. 2014

Part & Part Syst Charact

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“…25,26 There appear to have been only few other studies of this particular model system however. [27][28][29][30] Polystyrene (PS) can be dissolved in DMF and here it is shown that the resulting polymer solutions are near to theta (Θ) conditions. Using two different silica sizes allowed q to be varied, while the electrical double layer thickness (κ -1 ) could be varied through the LiCl concentration.…”

Section: Introductionmentioning

confidence: 95%

“…The addition of LiCl allows the charge interactions to be screened. Such suspensions have been used previously as model hard spheres. , There appear to have been only few other studies of this particular model system however. − …”

Section: Introductionmentioning

confidence: 99%

The Phase Behavior of Dispersions of Silica Particles in Mixtures of Polystyrene and Dimethylformamide

2010

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Depletion-induced phase separation in mixtures of charged silica particles and nonadsorbing polymer near theta conditions (polystyrene in dimethylformamide) was studied. The colloid-polymer size ratio q was varied through the particle size and the electrical double layer thickness (kappa(-1)) through addition of lithium chloride (LiCl). The dependence of the phase boundaries, and the nature of the separated phases, on q and kappa is reported and is found to be in good agreement with recent theoretical predictions (Gogelein, C.; Tuinier, R. Eur. Phys. J., E 2008, 27, 171-184).

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“…Coating of the obtained platelets with silica was done using a modified Stöber method as follows [34][35][36]. The platelets were dispersed in a 100 g/L aqueous solution of polyvinylpyrrolidone (Aldrich, 40 kg/mol).…”

Section: Methodsmentioning

confidence: 99%

Nematic and lamellar liquid-crystalline phases in suspensions of charged silica-coated gibbsite platelets

et al. 2014

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Computer simulations, theoretical investigations and experiments carried out over the last 20 years have demonstrated that suspensions of hard plate-like colloids display a rich liquid-crystal phase behaviour including nematic and columnar phases. Recently, it has become clear that charged colloidal platelets display an even richer phase behaviour including smectic A and smectic B phases. Here, we report on the formation of liquid crystals in suspensions of charged silica-coated gibbsite platelets in dimethylformamide in the presence of 1 mM salt and without added salt. A nematic phase is observed in the system with added salt, while in the system without added salt a lamellar (smectic A) liquid-crystalline phase is formed as demonstrated by optical observations and synchrotron small angle X-ray scattering measurements. The observed phases are in contrast with the columnar phase that would be expected if the platelets were interacting through hard-core repulsions. A bifurcation analysis suggests that, on decreasing ionic strength, first the columnar phase is destabilised in favour of nematic order, which in turn is destabilised in favour of lamellar order. Our experimental and theoretical results support the suggestion that the appearance of nematic and lamellar phases is related to the strength and range of the double-layer repulsion.

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Synthesis of fluorescent silica-coated gibbsite platelets

Cited by 10 publications

References 23 publications

Colloidal Silica Rods: Material Properties and Fluorescent Labeling

Colloidal Silica Rods: Material Properties and Fluorescent Labeling

The Phase Behavior of Dispersions of Silica Particles in Mixtures of Polystyrene and Dimethylformamide

Nematic and lamellar liquid-crystalline phases in suspensions of charged silica-coated gibbsite platelets

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