Effect of sodium dodecylsulfate monomers and micelles on the stability of aqueous dispersions of titanium dioxide pigment nanoparticles against agglomeration and sedimentation

Yang, Yung-Jih; Kelkar, Aniruddha V.; Zhu, Xilan; Bai, Guanrong; Ng, Hou T.; Corti, David S.; Franses, Elias I.

doi:10.1016/j.jcis.2015.02.051

Cited by 39 publications

(59 citation statements)

References 48 publications

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“…In addition to enhancing the stability against sedimentation, at c DDAB = 0.05−2.0 wt %, the surfactant also improves the stability of the TiO 2 particles against agglomeration. 4 DLS results, in which TiO 2 dispersions were diluted sufficiently before the measurements to avoid excessive light scattering, showed that the particle sizes were stable for at least 140 h ( Figure S3). Since the TiO 2 particles are positively charged with ζ ≈ 50 mV, the stabilization mechanism appears to be based on the presence of strong electrostatic repulsive forces ( Figure S1).…”

Section: Resultsmentioning

confidence: 99%

“…To generate inks of good optical quality, the diameter d of these particles is chosen to be around 300 nm. Even if agglomeration is prevented, these TiO 2 particles still sediment in water at a rate of 1 cm in about 15 h. 4 The degree of sedimentation of dispersed particles at steady state depends on the dimensionless Peclet number, Pe, which is defined here as the ratio of the sedimentation rate to the diffusion rate, Pe ≡ πd 3 ΔρgL/6k B T, 4 where k B is the Boltzmann constant, T is the absolute temperature, L is the dispersion height, and g is the acceleration due to gravity. For Δρ = 3.2 g/ cm 3 , L = 1 cm, T = 298 K, and d = 300 nm, Pe ≈ 1000.…”

Section: Introductionmentioning

confidence: 99%

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Use of Close-Packed Vesicular Dispersions to Stabilize Colloidal Particle Dispersions against Sedimentation

2015

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For many applications of colloidal dispersions, the particles must be suspended for a long time. This is often accomplished by preventing agglomeration, which generates aggregates of increasing size. Nevertheless, many colloidal dispersions of dense particles may settle even without agglomeration. Preventing sedimentation without significantly increasing the bulk dispersion viscosity is difficult and has received little attention in the literature. However, settling can be drastically reduced through the novel use of close-packed vesicular dispersions at high enough concentrations, which are non-Newtonian shear-thinning fluids. Such dispersions have much higher viscosities at the low shear stresses "felt" by sedimenting colloidal particles than at the high shear stresses relevant to bulk dispersion flow. In a practical example, dense TiO 2 nanoparticles which normally would settle rapidly can remain suspended for at least 6 months without any observable sedimentation when they are introduced into a close-packed vesicular dispersion, while the dispersion retains its flowability. Cryo-TEM images reveal that the vesicles in these dispersions are tightly close-packed. Dynamic light scattering and electrophoretic mobility data also confirm that the vesicles in such dispersions have very low mobilities.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Use of Close-Packed Vesicular Dispersions to Stabilize Colloidal Particle Dispersions against Sedimentation

2015

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“…A further possibility to induce depletion interactions is represented by the addition of surfactants in concentrations larger than their critical micellar concentration. In these cases, a somewhat counterintuitive role of the surfactants emerges: if added beyond a certain amount, their stabilizing effect (through adsorption on the particles to be stabilized) turns into a strongly destabilizing effect caused by micelles-induced depletion forces [42]. One of the most investigated systems consists of crosslinked PMMA particles dispersed in a mixture of cis-decaline and cyclohexyl bromide, and polystyrene chains are used as depleting agent.…”

Section: Interaction Potentialmentioning

confidence: 99%

Fractal-like structures in colloid science

Lazzari

Nicoud

Jaquet

et al. 2016

Advances in Colloid and Interface Science

170

126

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a b s t r a c tThe present work aims at reviewing our current understanding of fractal structures in the frame of colloid aggregation as well as the possibility they offer to produce novel structured materials. In particular, the existing techniques to measure and compute the fractal dimension d f are critically discussed based on the cases of organic/inorganic particles and proteins. Then the aggregation conditions affecting d f are thoroughly analyzed, pointing out the most recent literature findings and the limitations of our current understanding. Finally, the importance of the fractal dimension in applications is discussed along with possible directions for the production of new structured materials.

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“…Surfactantassisted sol-gel method was widely used to synthesize mesoporous materials (Jentys et al 1996;Beck et al 1992;Wang et al 1999;Tanev et al 1997).With successfully synthesized MCM-like mesoporous material (Liu et al 2004;Yang et al 2015), it is believed that nanoparticles of zinc-doped titania could be possible to synthesize using similar surfactant-assisted sol-gel method.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and photocatalytic applications of Zn-doped TiO2 nanoparticles by sol–gel method

Aware¹,

Jadhav²

2015

Appl Nanosci

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Mesoporous, nanocrystalline, Zinc-doped TiO 2 nanoparticles were synthesized by surfactant-assisted solgel method. The X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), and UV-VIS spectrometer techniques were used to characterize the synthesized products. XRD results confirm the formation of the anatase phase for the TiO 2 nanoparticles, with crystallite sizes in the range of 12.6-18.1 nm. The small crystallite size and doping with Zinc ion inhibit phase transformation and promote the growth of the TiO 2 anatase phase. The SEM and TEM micrographs revealed the spherical-like morphology with average diameter of about 12-18 nm which is in agreement with XRD results. The optical study shows that doping ions lead to an increase in the absorption edge wavelength and a decrease in the band gap energy of titania. Photocatalytic activity of the synthesized nanomaterials was successfully tested for photodegradation of methyl red as model pollutant under UV light. The photocatalytic activity results confirm that the doped nanoparticles show higher activity than undoped titania. The small grain size, high crystallinity, high specific surface area and decrease in the band gap energy of doped titania may be responsible for the high photocatalytic activity.

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Effect of sodium dodecylsulfate monomers and micelles on the stability of aqueous dispersions of titanium dioxide pigment nanoparticles against agglomeration and sedimentation

Cited by 39 publications

References 48 publications

Use of Close-Packed Vesicular Dispersions to Stabilize Colloidal Particle Dispersions against Sedimentation

Use of Close-Packed Vesicular Dispersions to Stabilize Colloidal Particle Dispersions against Sedimentation

Fractal-like structures in colloid science

Synthesis, characterization and photocatalytic applications of Zn-doped TiO2 nanoparticles by sol–gel method

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