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Title: Cellular morphology of organic-inorganic hybrid foams based on alkali alumino-silicate matrix

Organic-inorganic hybrid foams based on an alkali alumino-silicate matrix were prepared by using different foaming methods. Initially, the synthesis of an inorganic matrix by using aluminosilicate particles, activated through a sodium silicate solution, was performed at room temperature. Subsequently the viscous paste was foamed by using three different methods. In the first method, gaseous hydrogen produced by the oxidization of Si powder in an alkaline media, was used as blowing agent to generate gas bubbles in the paste. In the second method, the porous structure was generated by mixing the paste with a “meringue” type of foam previously prepared by whipping, under vigorous stirring, a water solution containing vegetal proteins as surfactants. In the third method, a combination of these two methods was employed. The foamed systems were consolidated for 24 hours at 40°C and then characterized by FTIR, X-Ray diffraction, scanning electron microscopy (SEM) and compression tests. Low density foams (∼500 Kg/m{sup 3}) with good cellular structure and mechanical properties were obtained by combining the “meringue” approach with the use of the chemical blowing agent based on Si.
Authors:
; ;  [1] ; ;  [2] ;  [3]
  1. Institute of Composite and Biomedical Materials, National Research Council, Naples (Italy)
  2. Department of Chemical, Materials and Industrial Engineering, University of Naples Federico II, Naples (Italy)
  3. Institute of Composite and Biomedical Materials, National Research Council, Naples, Italy and IMAST SCRAL, Piazza Bovio 22 Napoli 80133 (Italy)
Publication Date:
OSTI Identifier:
22280339
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1599; Journal Issue: 1; Conference: 7. international conference on times of polymers (TOP) and composites, Ischia (Italy), 22-26 Jun 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AQUEOUS SOLUTIONS; COMPRESSION; DENSITY; FOAMS; FOURIER TRANSFORMATION; HYDROGEN; INFRARED SPECTRA; MATRIX MATERIALS; MECHANICAL PROPERTIES; MORPHOLOGY; POROUS MATERIALS; POWDERS; PROTEINS; SCANNING ELECTRON MICROSCOPY; SODIUM SILICATES; TEMPERATURE RANGE 0273-0400 K; X-RAY DIFFRACTION