The paper presents the results of investigation concerning using a high-temperature pigment based on synthetic tri-manganese tetra-oxide (Mn3O4) in the production of volume-colored bricks using red-burning clay. It is established that the introduction of a pigment in the amount of 2–4% results in a rich dark brown brick. At the same time, the intensity of the color increases with an increase in the pigment concentration from 2 to 4% and a brick firing temperature from 800 to 950°C. It has been established that with the introduction of pigment the strength of the obtained brick samples decreases, as well as the frost resistance.
The possibility of using clay from Bochkarikhinskoe deposit (Sverdlovskaya oblast, Russia) in the ceramic building production has been considered. The chemical, mineral and granulometric composition of clay was determined. The basic technological properties of clay were studied: plasticity, sensitivity to drying, sintering. The frost resistance and mechanical properties of ceramic brick samples were determined. The clay studied with introduction of organic additives also may be used in ceramic production.
During the operation of porcelain stoneware sometimes there is a type of defects associated with crumbling from the edge of tile. In addition, cracks occur when a small object is fallen and during transportation of the products. Compared to conventional ceramic floor tiles, porcelain stoneware has increased strength, which explains its high price. The brittle failure is most likely, due to the hardening of glassy phase of tiles during cooling stage of the firing process. As a rule, the quenching temperature depends on the chemical composition of the glassy phase formed during firing. Both the phase and chemical composition of porcelain stoneware, and the chemical composition of the glassy phase are determined.
The hybrid hydrogel materials meet important social challenges, including the photocatalytic purification of water and bio-medical applications. Here, we demonstrate two scenarios of polyacrylamide-TiO2 (PAAm@TiO2) composite hydrogel design using calcium alginate (Alg-Ca) or Keplerate-type polyoxometalates (POMs) {Mo132} tuning the polymer network structure. Calcium alginate molding allowed us to produce polyacrylamide-based beads with an interpenetrating network filled with TiO2 nanoparticles Alg-Ca@PAAm@TiO2, demonstrating the photocatalytic activity towards the methyl orange dye bleaching. Contrastingly, in the presence of the POM, the biocompatible PAAm@TiO2@Mo132 composite hydrogel was produced through the photo-polymerization approach (under 365 nm UV light) using vitamin B2 as initiator. For both types of the synthesized hydrogels, the thermodynamic compatibility, swelling and photocatalytic behavior were studied. The influence of the hydrogel composition on its structure and the mesh size of its network were evaluated using the Flory–Rehner equation. The proposed synthetic strategies for the composite hydrogel production can be easily scaled up to the industrial manufacturing of the photocatalytic hydrogel beads suitable for the water treatment purposes or the biocompatible hydrogel patch for medical application.
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