Assessment of humidity self-regulation functionality for ceramic tiles

Effect of firing temperature on humidity self-regulation functionality in a ceramic tile composition

“…For the development of this work, an industrial composition already used in the first part of the study has been employed. This composition is used in industry for the manufacture of porous ceramics and is based on a mixture of gibbsite, white plastic clay and other minerals (talc and quartz) as reported [18]. It is an industrial composition, in the form of spray-dried powder, which showed an excellent humidity regulating capacity of interest for tile manufacturing.…”

“…The determination of pore size distributions was also carried out by mercury intrusion porosimetry and nitrogen gas adsorption. As previously mentioned [18], although the presence or absence of mesopores can be evidenced by mercury porosimetry, nitrogen adsorption is key for the characterisation since it allows determining specific surface area, total volume of mesopores and mean pore diameter. For the former, an automated mercury porosimeter (AutoPore IV 9500, Micromeritics) was used.…”

“…In another work, Vu et al have managed to reach higher temperatures up to 1100 °C while preserving the adsorption-desorption capacity, but the composition is mainly based in diatomite (90 %) giving rise to extremely high porous pieces that are very difficult to handle in a tile manufacturing process and which could not be marketed afterwards [17]. Recently, the authors of the present work have published an article where a kinetic study of the moisture adsorption and desorption capacity of ceramic tiles obtained from different ceramic compositions based on the mineral gibbsite has been carried out [18]. Excellent moisture regulation capacities have been obtained at temperatures above 1100 ºC, although the study was limited to a maximum temperature of 1120 ºC.…”

“…As a consequence of the above, this work addresses to continue the previous research in order to evaluate the effect of the firing temperature on the humidity regulating capacity of ceramic tiles and to determine the maximum firing temperature at which this functionality can be preserved. For this purpose, the kinetic model developed in the previous work [18] will be used in order to correlate the parameters of the model with the firing temperature as well as the latter with the evolution of the porous structure of the fired pieces.…”

Synthesis and Grafted NH2-Al/MCM-41 with Amine Functional Groups as Humidity Control Material from Silicon Carbide Sludge and Granite Sludge

“…In order to promote its recycling, SiC sludge and GS should be manufactured into high value-added products, such as novel humidity control material. Recent research on preparing humidity control material [6,7] has led to a proliferation of relevant studies on improving comfort and saving energy in buildings [8]. The humidity regulating material has the capability of absorbing water vapor to lower the humidity once the indoor RH is more than 70%, and vice versa, it can release the adsorbed water vapor to raise the humidity when the humidity falls under RH 40% [6].…”