Improved wetting of bare and pre-coated steels by aqueous alumina sols for optimum coating success

Feigl, Michael; Nofz, Marianne; Sojref, Regine; Kohl, Anka

doi:10.1007/s10971-010-2232-7

Cited by 3 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• The surface tension • The particle size and its distribution • The viscosity • The stability of viscosity and particle size with time The surface tension of nonaqueous sols is usually low enough to enable a sufficiently good wetting of different kinds of substrates. Problems arise when applying aqueous sols whose surface tension is~78 mN/m (Jing et al 2007b) or 64 mN/m (Feigl et al 2010). Then additives (see Table 2) are necessary to obtain good coating results.…”

Section: Properties Of Coating Solsmentioning

confidence: 99%

Alumina Thin Films

Nofz¹

2016

Handbook of Sol-Gel Science and Technology

View full text Add to dashboard Cite

This chapter gives an overview over preparation, properties, and applications of alumina thin films. The preparation of polymeric and colloidal alumina sols and their deposition on diverse substrate materials with different geometries are described first. Consideration of properties (surface tension, particle size, viscosity, aging of the sols, and their optimization by using certain additives) is included, too. A description of posttreatments of the coatings, which initiate phase transformations and also determine their microstructure, completes the part on coating preparation. Data on adhesion, thickness, surface roughness, and mechanical, textural as well as optical properties of alumina thin films are provided in a further paragraph. In a third main part, experience concerning possible applications, such as (i) membranes for catalysis, separation, and filtration, (ii) barrier layers against electrochemical and high-temperature corrosion or interdiffusion of ions between different phases, (iii) mechanical protection, (iv) sensor construction, (v) improvement of optical properties, as well as (vi) achieving water repellency, is summarized.

show abstract

Section: Properties Of Coating Solsmentioning

confidence: 99%

Alumina Thin Films

Nofz¹

2016

Handbook of Sol-Gel Science and Technology

View full text Add to dashboard Cite

show abstract

“…Subsequently, the contact angle of different formulations on both Aluzinc Ò and bright annealed substrates were determined. The total surface tension of the different formulations, measured by the pendant droplet method; and the dispersive component of it, extracted by the captive bubble method in pentane; were used to calculate the polar component of the surface tension [44,45]. These components can be plotted as coordinates in a graph together with the wetting envelopes of the substrates in order to determine the wetting of the formulations over these substrates.…”

Section: Contact Angle and Pendant Droplet Measurementsmentioning

confidence: 99%

High-throughput analysis for preparation, processing and analysis of TiO2 coatings on steel by chemical solution deposition

Gil

Driessche

Gils

et al. 2012

Journal of Alloys and Compounds

View full text Add to dashboard Cite

a b s t r a c tA high-throughput preparation, processing and analysis of titania coatings prepared by chemical solution deposition from water-based precursors at low temperature (%250°C) on two different types of steel substrates (Aluzinc Ò and bright annealed) is presented. The use of the high-throughput equipment allows fast preparation of multiple samples saving time, energy and material; and helps to test the scalability of the process. The process itself includes the use of IR curing for aqueous ceramic precursors and possibilities of using UV irradiation before the final sintering step. The IR curing method permits a much faster curing step compared to normal high temperature treatments in traditional convection devices (i.e., tube furnaces).The formulations, also prepared by high-throughput equipment, are found to be stable in the operational pH range of the substrates (6.5-8.5). Titanium alkoxides itself lack stability in pure water-based environments, but the presence of the different organic complexing agents prevents it from hydrolysis and precipitation reactions. The wetting interaction between the substrates and the various formulations is studied by the determination of the surface free energy of the substrates and the polar and dispersive components of the surface tension of the solutions. The mild temperature program used for preparation of the coatings however does not lead to the formation of pure crystalline material, necessary for the desired photocatalytic and super-hydrophilic behavior of these coatings. Nevertheless, some activity can be reported for these amorphous coatings by monitoring the discoloration of methylene blue in water under UV irradiation.

show abstract

Alumina Thin Films

Nofz

2018

Handbook of Sol-Gel Science and Technology

View full text Add to dashboard Cite

Improved wetting of bare and pre-coated steels by aqueous alumina sols for optimum coating success

Cited by 3 publications

References 31 publications

Alumina Thin Films

Alumina Thin Films

High-throughput analysis for preparation, processing and analysis of TiO2 coatings on steel by chemical solution deposition

Alumina Thin Films

Contact Info

Product

Resources

About