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Multifunctional inorganic foams based on alkali – activated materials
The fabrication of inorganic foams with a porosity gradient is widely desired from scientists in order to achieve enhanced performances, mainly due to their low density, high strength and specific functional properties. Multifunctional inorganic foams represent innovative systems thought for specific and advanced functions, in which a spatial gradation in structure and/or composition lends itself to tailored properties and for this reason they find application in a broad range of high–tech fields such as energy, building, aerospace, filtration and bioengineering. Supporting or shaping zeolites can represent a challenge to obtain this kind of systems. In fact, structuring a porous powder, as a zeolite, permit to obtain an optimized structure with high mass transfer, low pressure drops and high mechanical and chemical stability. Different methods have been developed to achieve this technological goal, by using porous ceramic binders, polymer foams, or permeable bags. Pelletization and extrusion are the most frequently used methods to shape powdery zeolites, but they require a binder that can partially obstruct the active sites of zeolite. Recently, Additive Manufacturing (AM) approach has been also tested to obtain binder–less shaped zeolite monoliths. Geopolymer Gel Conversion (GGC) represents an economic and sustainable alternative to obtain a self-supporting zeolite. Several studies confirms that it is possible to promote the nucleation of a zeolite inside a geopolymeric matrix by tuning pH, temperature, pressure, and time of the geopolymerization reaction. In fact, the geopolymers can be considered the amorphous counterpart or precursor of crystalline zeolites. The hydrothermal treatment is the traditional method to promote the crystallization of zeolites in the geopolymer framework. More recently a one-step procedure is developed, during which geopolymerization and zeolites formation can take place simultaneously. The two-step method is useful to drive the crystallization of a specific zeolite inside the ...
Multifunctional inorganic foams based on alkali – activated materials
The fabrication of inorganic foams with a porosity gradient is widely desired from scientists in order to achieve enhanced performances, mainly due to their low density, high strength and specific functional properties. Multifunctional inorganic foams represent innovative systems thought for specific and advanced functions, in which a spatial gradation in structure and/or composition lends itself to tailored properties and for this reason they find application in a broad range of high–tech fields such as energy, building, aerospace, filtration and bioengineering. Supporting or shaping zeolites can represent a challenge to obtain this kind of systems. In fact, structuring a porous powder, as a zeolite, permit to obtain an optimized structure with high mass transfer, low pressure drops and high mechanical and chemical stability. Different methods have been developed to achieve this technological goal, by using porous ceramic binders, polymer foams, or permeable bags. Pelletization and extrusion are the most frequently used methods to shape powdery zeolites, but they require a binder that can partially obstruct the active sites of zeolite. Recently, Additive Manufacturing (AM) approach has been also tested to obtain binder–less shaped zeolite monoliths. Geopolymer Gel Conversion (GGC) represents an economic and sustainable alternative to obtain a self-supporting zeolite. Several studies confirms that it is possible to promote the nucleation of a zeolite inside a geopolymeric matrix by tuning pH, temperature, pressure, and time of the geopolymerization reaction. In fact, the geopolymers can be considered the amorphous counterpart or precursor of crystalline zeolites. The hydrothermal treatment is the traditional method to promote the crystallization of zeolites in the geopolymer framework. More recently a one-step procedure is developed, during which geopolymerization and zeolites formation can take place simultaneously. The two-step method is useful to drive the crystallization of a specific zeolite inside the ...
Multifunctional inorganic foams based on alkali – activated materials
Campanile, Assunta (Autor:in)
13.12.2021
Campanile, Assunta (2021) Multifunctional inorganic foams based on alkali – activated materials. [Tesi di dottorato]
Hochschulschrift
Elektronische Ressource
Italienisch , Englisch
ALKALI-ACTIVATED LIGHTWEIGHT COMPOSITES BASED ON ALKALI-ACTIVATED FOAMS AND MANUFACTURING PROCESS
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Review on designs and properties of multifunctional alkali-activated materials (AAMs)
| British Library Online Contents | 2019
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