Silica coatings on α‐alumina particles: Analysis and deposition mechanism

Firment, L. E.; Bergna, Horacio E.; Swartzfager, D. G.; Bierstedt, P. E.; Kavelaar, Michael L. Van

doi:10.1002/sia.740140111

Cited by 13 publications

(14 citation statements)

References 18 publications

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“…Silica/silicate layers have been deposited on iron oxides, [2 -4] copper, [5] zinc [6] and alumina. [7,8] Hiemstra et al investigated the adsorption of silicic acid on goethite (α-FeOOH). [2] It was shown that the Si adsorption reaches a maximum at a pH of ∼9.…”

Section: Introductionmentioning

confidence: 99%

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Silicate‐based post‐anodic treatment for lithographic application

Moriamé¹,

Vandendael²,

Graeve³

et al. 2009

Surface & Interface Analysis

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a Sodium silicate solutions are widely used chemicals for a variety of applications. In particular, they are commonly used in pre-treatments of aluminium alloys as cleaners and corrosion inhibitors. Another application is found in offset printing, where after graining and anodising, a silicate-based post-anodic treatment (PAT) is considered to optimise the aluminium plate characteristics. It is, however, not clear what type of interaction takes place between the oxide-covered aluminium and the silicate solution. In this work, silicate-based PAT is studied. Different barrier-type and porous-type aluminium oxides are silicate-treated by dipping in a water-based sodium silicate solution and the effect of time on the deposition is studied. Particular attention is given to the role of rinsing when the alumina surface is washed in water after the silicate treatment. A good understanding of the role of rinsing allows us to obtain information on the characteristics of the silicate layer which is formed after dipping. The surface modifications induced by the silicate treatment on the aluminium oxides were monitored by means of field emission scanning electron microscopy and infrared spectroscopic ellipsometry. Quantitative measurements on the amount of deposited silicate were taken by X-ray fluorescence, and relative comparisons between different oxides are shown. Auger electron spectroscopy was used to study the in-depth composition of the silicate deposition. Experiments show a high affinity of the silicate to the anodic oxide film. A thin nanometric chemisorbed (alumino)silicate layer is present on the surface after rinsing, while the physisorbed part of the layer is washed away.

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Section: Introductionmentioning

confidence: 99%

“…[7] A random growth mechanism was proposed for the first stage of the layer growth: the silica units approaching the surface stick where they first contact the surface. The silica units have no preference as to where they become permanently fixed.…”

Section: Introductionmentioning

confidence: 99%

Silicate‐based post‐anodic treatment for lithographic application

Moriamé¹,

Vandendael²,

Graeve³

et al. 2009

Surface & Interface Analysis

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“…As the ESCA sampling depth is typically 3-6 nm, it follows that at normal coating levels the underlying substrate can contribute significantly to the measured signal even when perfect encapsulation has been achieved. This conclusion has been confirmed experimentally for dense silica coatings on both alumina (18,34) and titania (50). Thus although ESCA is highly surface sensitive, it is not sufficiently sensitive to readily differentiate between, e.g., a 3% coating spread evenly over a 200 nm particle, and the same amount of material covering only 50% of the surface with a coating that is twice as thick.…”

Section: Surface Analytical Methodsmentioning

confidence: 74%

“…A number of studies of dense silica deposition on alumina have been published (18,34) but there has been much less effort directed towards understanding the mechanism of other coatings on ceramic particles and the coating procedures are much less well developed.…”

Section: Coatings On Ceramic Particlesmentioning

confidence: 99%

The Modification of Fine Powders by Inorganic Coatings

Egerton

1998

KONA

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“…From a technical point of view, the surface precipitation offers an interesting opportunity to create core-shell particles (e.g. Firment et al 1989). …”

Section: Surface Precipitationmentioning

confidence: 99%

Fundamentals in Colloid Science

Babick

2016

Suspensions of Colloidal Particles and Aggregates

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Preparation and handling of colloidal suspension or even their characterisation is not possible without a basic understanding of the physical effects that prevail on the microscopic level. Some of these effects are directly related to the fineness of the particles because it coincides with a large specific surface area (which corresponds, e.g., to a high adsorption capacity), a considerably curvature of the particle surface (which i. a. promotes dissolution), a high number concentration (i.e. significant osmotic pressure and large collision frequencies), small interparticle distances (i.e. strong interactions between scattered waves), low particle mass (i.e. low weight and inertia), or with the fact that the wavelength of light is larger than particle size (i.e. weak optical scattering). A further effect of the small size of colloidal particles is that their diffusive motion is much faster than for micrometre particles. Moreover, the interactions between colloidal particles are decisive for the macroscopic behaviour of the whole suspension (e.g. with regard to rheology or coagulation). These interactions may be attractive and/or repulsive and depend on the chemical nature and the material properties of the particles. Most of all, they are affected by the interfacial properties which reflect the physico-chemical interaction between the particulate phase, the solvent, and the solutes (e.g. hydrophobicity, adsorption, surface charging).This chapter provides a brief introduction to the fundamentals in colloid science. It addresses the physico-chemical properties of single colloidal particles as well as the processes at the interface and the structure of the interfacial layer. It further examines the non-viscous interactions that occur among colloidal particles. For detailed explanation, the reader is referred to the textbooks of Adamson and Gast

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Silica coatings on α‐alumina particles: Analysis and deposition mechanism

Cited by 13 publications

References 18 publications

Silicate‐based post‐anodic treatment for lithographic application

Silicate‐based post‐anodic treatment for lithographic application

The Modification of Fine Powders by Inorganic Coatings

Fundamentals in Colloid Science

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