Influence of concentration of pore forming agent on porosity of SiO₂ ceramic from rice husk ash

Use of Almond Shells and Rice Husk as Fillers of Poly(Methyl Methacrylate) (PMMA) Composites

“…The combined presence of lignin and silica in the porous structure of rice hulls shows potential for example for the decontamination of environmental objects [ 3 ], while on the other hand providing significant interest in terms of offering an increased hardness and tear strength to a polymer matrix [ 4 ]. It is worth considering though that an increase of properties by the introduction of rice husk in materials is generally obtained through the extensive use of modifications, such as grafting [ 5 ] or application of foaming agents [ 6 ]. A work on poly(methyl methacrylate) with rice husk reported the application of a treatment with triphenylphosphine [ 7 ].…”

Preparation of cellular alumina ceramics via biological foaming with yeast and its microstructural characterization via stereological relations

“…as fillers, from rice husk ash. 26,27 Some hints on yeast-based foaming techniques are also hidden in the patent literature, where we found two US patents, 28,29 one of which concerns porous phosphate ceramic bone graft materials 29 and the other mentions yeast -among many other substances -as an example of a foaming agent in a very general way, 28 two older German patents 30,31 and three very recent Chinese patents. [32][33][34] However, only three of the latter concern the use of yeast as a foaming agent, 30-32 mentioning building and insulating materials as well as "granular aggregates" of alumina, zirconia, mullite and metal particles as examples, while the other two 33,34 use dry yeast powder as a mere pore former, obviously without exploiting its foaming capability.…”

Kalsiyum Kaynağı Olarak Yumurta Kabuğu Atığı ve Genleştirilmiş Polistiren Granülleri Kullanılarak Gözenekli Anortit Seramik Üretimi

“…Alongside the existing methods, the use of poreforming agents that burn during firing is most common for IFBs production. In this method, sawdust, rice husk, fine coke, starch, wheat particles, expanded perlite and vermiculite or high-molecular synthetic compounds such as foam polystyrene, polyethylene, polyvinyl are added as flammable materials to form a pore during firing [5,6,[14][15][16][17][18][19][20]. Until now, many research studies have been carried out on anorthite-based ceramics.…”