Size distribution of colloidal silica in sodium silicate solutions investigated by dynamic light scattering and viscosity measurements

Böschel, Dorit; Janich, Martin A.; Roggendorf, Hans

doi:10.1016/j.jcis.2003.07.016

Cited by 48 publications

(30 citation statements)

References 9 publications

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“…Our investigation shows that there are multiple fractions of colloidal particles in the solutions, in agreement with previous studies [11,13,14]. Along the increased concentration route there is a shift in the equilibrium size of the larger colloidal particles towards smaller sizes.…”

Section: Discussionsupporting

confidence: 92%

“…Using the measured macroscopic viscosity gives a radius of about 1 Å which is less than the radius of a monomer, and thus not physically plausible. The presence of two or more silica species with different size-ranges is in agreement with previous studies on similar systems [1,11,13].…”

Section: Discussionsupporting

confidence: 92%

“…The structure of sodium silicate solutions at pH > 11 has previously been studied for different concentrations, pH and SiO 2 :Na 2 O ratios [1,2,6,[11][12][13][14][15][16]. In general, there seems to be a structural change in the sodium silicate solutions in the region where the SiO 2 :Na 2 O ratio is 2.0-2.5.…”

Section: Introductionmentioning

confidence: 99%

“…Above this ratio, most studies show evidence of small colloidal particles in the tens of nm range. Böschel et al [11] propose three particle fractions of spherical particles with radii of about 0.5 nm, 2.5-15 nm and 75-90 nm in sodium silicate solutions of SiO 2 :Na 2 O ratio 2.2-3.9 in the pH range 10.5-12.5 and at relatively low silica content (0.5-15 wt%).…”

Section: Introductionmentioning

confidence: 99%

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Concentration- and pH-dependence of highly alkaline sodium silicate solutions

Nordström

Nilsson

Jarvol

et al. 2011

Journal of Colloid and Interface Science

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Concentration- and pH-dependence of highly alkaline sodium silicate solutions

Nordström

Nilsson

Jarvol

et al. 2011

Journal of Colloid and Interface Science

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“…Therefore, it is concluded that the use of coarser opal grains did not significantly slow down the dissolution process as it was initially hoped. The effects of particle size and specific surface area on dissolution rates was discussed by Diedrich et al [17] The purity of the liquid phase was enhanced by crystallization of analcime. This phase crystallizes under hydrothermal conditions and contains Al in its chemical formula.…”

Section: Discussionmentioning

confidence: 99%

Hydrothermal Dissolution of Opal in Sodium Hydroxide Lyes for the Synthesis of Water Glass

Pfeiffer¹,

Enke²,

Roth³

et al. 2017

ACES

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Common opal was dissolved in NaOH lyes in rotating autoclaves. The starting material was characterized by X-ray diffraction and adsorption spectroscopy, thermal and chemical analysis, electron and atomic force microscopy. The opal proved to be an Opal-CT with a microstructure consisting of microcrystalline tridymite, traces of low-quartz, and amorphous parts built up by random packings of size distributed amorphous silica colloids. The dissolution conditions have been inspired by the technological process of hydrothermal water glass synthesis by dissolving silica. Temperature and time of the dissolution process as well as initial molar SiO 2 :Na 2 O (R m ) ratios of the starting materials were varied systematically. The particle size of the samples was varied, too, but due to the nanoscopic microstructure without greater impact on dissolution kinetics. The process products were analyzed chemically. Additionally, some of them were characterized by X-ray diffraction, viscosimetry and dynamic light scattering. Already after short dissolution times, water glasses with quite high silica concentrations of up to 27 wt.% and SiO 2 :Na 2 O ratios of up to 3.7 were obtained. At longer dissolution times low-quartz and analcime precipitated and the SiO 2 contents were reduced to about 22 wt.% and R m to about 2.7. The silica contents in equilibrium with low-quartz were almost independent on temperature.

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Silicon Compounds: Anthropogenic Silicas and Silicates

Falcone

2005

Kirk-Othmer Encyclopedia of Chemical Technology

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Synthetic akali silicates, M 2 O· m SiO 2 · n H 2 O, where M = Li, Na, and K, are manufactured as liquids or glasses that readily dissolve in water to form alkaline solutions. These silicates contain a complex mixture of polymeric species that vary as a function of modulus, m , of the material, solution concentration, impurities content, and pH value. The polymer chemistry of silicates influences the properties and function of these materials in a variety of applications including detergency, water treatment, mineral beneficiation, bleach stabilization, and as a raw material for the syntheses of silica sols, gels and precipites, zeolites, clays, and other siliceous materials. The speciation and structure of silicates have been studied using a broad variety of analytical methods including Fourier transform infrared, ft–nmr, laser Raman, and X‐ray photoelectron spectroscopic techniques. The current article discusses the properties of the synthetic alkali silicates that determine their function in a variety of commercial applications. Economic, manufacturing, regulatory and environmental aspects of silicate production and usage are reviewed.

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Size distribution of colloidal silica in sodium silicate solutions investigated by dynamic light scattering and viscosity measurements

Cited by 48 publications

References 9 publications

Concentration- and pH-dependence of highly alkaline sodium silicate solutions

Concentration- and pH-dependence of highly alkaline sodium silicate solutions

Hydrothermal Dissolution of Opal in Sodium Hydroxide Lyes for the Synthesis of Water Glass

Silicon Compounds: Anthropogenic Silicas and Silicates

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