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Tainted Chinese Drywall
Published in Kathleen Hess-Kosa, Indoor Air Quality, 2018
Strontium is commonly used in paints and coatings for a variety of purposes. A few examples include, but are not limited to, the following: Strontium frequently replaces lead as a paint drier.Strontium is used in yellow, blue, red, and white pigments.Strontium aluminate is used in glow-in-the-dark coatings, wallpapers, and adhesive stickers.Strontium chromate, borate, and metaborate are used in anticorrosion additives, flame retardants, and antimicrobial agents in paints and coatings.
Effect of Physicochemical Properties of Native Starches on Cleaning in Falling Film and Plane Channel Flow Experiments
Published in Heat Transfer Engineering, 2022
Sebastian Kricke, Kristin Böttcher, Susann Zahn, Jens-Peter Majschak, Harald Rohm
The native starches were similarly gelatinized to provide reproducible samples. Luminescent stabilized strontium aluminate crystals were added to deionized water as tracer material and homogenized for 5 min at room temperature using a dissolver stirrer. To obtain starch pastes with similar viscosities the following concentrations of starch powder were slowly added: maize starch waxy maize starch potato starch wheat starch Gelatinization took place in a water bath at for while stirring at The liquid starch paste was evenly applied to stainless steel substrates (AISI 304 with a 2B finish, (plane channel) and (falling film)) using a pipette. The samples were finally dried at standard climate ( relative humidity) for about The criterion for the reproducibility of the samples was the initial soil mass of the dried samples, which was set to
New “ductile” zirconia-based ceramics for the development of dental implants
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2019
H. Reveron, A. Liens, J. Chevalier, M. Fornabaio, P. Palmero, L. Montanaro, T. Fürderer, S. Schomer, E. Adolfsson, N. Courtois
At the lab-scale, a commercial 10 mol.% Ceria-stabilized zirconia powder (Daiichi, Japan) was dispersed in distilled water and Al, Sr and Ce nitrates were added as precursors. After drying, the powder coated was thermally treated to obtain a tri-phasic zirconia-8vol.% alumina-8vol% strontium aluminate powder (ceria content between 10.0 and 11.5 mol.%). Ceramics were slip-casted or pressed and sintered (1350–1450 °C/1h) to reach 99.9% of the theoretical density. Four stabilization degrees were investigated and different mechanical tests were carried out (biaxial piston-on-3balls and 3balls-on-3balls, Single-edge V-notched beam, 4-point bending and fatigue) in order to investigate the mechanical behaviour of these composites. Biological performances in vitro and in vivo were also performed. At the industrial-scale, wet chemical synthesis and spray-drying of composite powders were carried-out (Daiichi, Japan). Ceramics produced by cold isostatic pressing (3000 bars) and conventional sintering (1350–1450 °C/1h) were machined applying CAD-CAM procedures (bars and dental implants).
Visualization of crack propagation for assisting double cantilever beam test through mechanoluminescence
Published in The Journal of Adhesion, 2018
Nao Terasaki, Yuki Fujio, Yoshitaro Sakata, Shin Horiuchi, Haruhisa Akiyama
To demonstrate the effectiveness of the mechanoluminescence-assisted DCB test, a simple DCB specimen was prepared using sandblasted aluminum as the adherend and epoxy adhesive (Denatite 2204, Nagase ChemteX Co., Osaka, Japan; curing temperature: 100°C; thickness: ~100 μm), as shown in Figure 2(a). As the core part of the ML sensor, green-emitting europium-doped strontium aluminate (SrAl2O4:Eu2+, denoted as SAOE, λem = 520 nm) was used because it shows the highest mechanoluminescence among a series of ML materials, with various emission colors across the ultraviolet to the infrared region. [3] Details on the preparation of the green-emissive SAOE microparticles (1 − 5 μm) by solid-phase have been described elsewhere. [1–3] ML sensors are of two types: paints and sheets. [3] Here, a commercial ML paint (ML-32ET, Sakai Chemical. Japan) was intentionally used for widely spreading in the field of structural adhesion. The ML paint was sprayed on the top and side surfaces of the DCB specimen to obtain ML films, as shown in Figure 2(b). From the microscopic images in Figure 2(c), the thickness of the ML films was estimated to be approximately 150 μm on the top surface and 100 μm on the side surface. The appropriate range of thickness values was used for visualizing the crack propagation and/or strain distribution.[3]