Controlling of pore structure of porous ceramics fabricated by gel-casting method

Reference Presenter Authors
17-005 Yunzi Xin Xin, Y.(Nagoya Institute of Technology); Hong, J.(Nagoya Institute of Technology); Shirai, T.(Nagoya Institute of Technology); Porous ceramics exhibit high permittivity, large surface area, light weight and good thermal insulating properties have attracted much attention in many potential applications such as filters, catalyst carriers, sensors, bioceramics and construction materials. Gel-casting is one of the simplest approaches for preparing porous ceramics by combing the foaming of slurry of ceramic powder and organic monomers followed with in-situ polymerization. The fabricated porous ceramics show relatively high intensity and gel-casting method is also applicable for complicated shaped porous ceramics. Hydroxyapatite (HAp), Ca10(PO4)6(OH)2, has been intensely utilized as absorbent, bioceramics for artificial bone and tooth, as well as ion exchange material. HAp also attracted much attention as non-precious metal contained catalyst for oxidative decomposition of organic volatile compounds (VOCs). In our previously work, we already reported the oxidative decomposition of VOCs by HAp powder under 100-500ºC and also confirmed the decomposition mechanism is due to the thermal-excited superoxide radical site on surface. Herein, a HAp porous filter is developed by gel-casting method. The pore structure of HAp porous filter was controlled by the additive amount of surfactant and foaming time. The pore structure was investigated by X-ray computed tomography scan, and the porosity was estimated by the Archimedes method, respectively. The controlling of pore structure via gel-casting method will be discussed in details and the catalyst performance of HAp porous filter for VOCs decomposition will also be demonstrated.
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