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Extension of the ‘Inorganic Gel Casting’ Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams

A new technique for the production of glass foams, based on alkali activation and gel casting, previously applied to soda-lime glass, was successfully extended to boro-alumino-silicate glass, recovered from the recycling of pharmaceutical vials. A weak alkali activation (2.5 M NaOH or NaOH/KOH aqueo...

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Autores principales: Rincon Romero, Acacio, Tamburini, Sergio, Taveri, Gianmarco, Toušek, Jaromír, Dlouhy, Ivo, Bernardo, Enrico
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6316894/
https://www.ncbi.nlm.nih.gov/pubmed/30558154
http://dx.doi.org/10.3390/ma11122545
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author Rincon Romero, Acacio
Tamburini, Sergio
Taveri, Gianmarco
Toušek, Jaromír
Dlouhy, Ivo
Bernardo, Enrico
author_facet Rincon Romero, Acacio
Tamburini, Sergio
Taveri, Gianmarco
Toušek, Jaromír
Dlouhy, Ivo
Bernardo, Enrico
author_sort Rincon Romero, Acacio
collection PubMed
description A new technique for the production of glass foams, based on alkali activation and gel casting, previously applied to soda-lime glass, was successfully extended to boro-alumino-silicate glass, recovered from the recycling of pharmaceutical vials. A weak alkali activation (2.5 M NaOH or NaOH/KOH aqueous solutions) of fine glass powders (below 70 µm) allowed for the obtainment of well-dispersed concentrated aqueous suspensions, undergoing gelation by treatment at low temperature (75 °C). Unlike soda-lime glass, the progressive hardening could not be attributed to the formation of calcium-rich silicate hydrates. The gelation was provided considering the chemical formulation of pharmaceutical glass (CaO-free) to the formation of hydrated sodium alumino-silicate (N-A-S-H) gel. An extensive direct foaming was achieved by vigorous mechanical stirring of partially gelified suspensions, comprising also a surfactant. A sintering treatment at 700 °C, was finally applied to stabilize the cellular structures.
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spelling pubmed-63168942019-01-08 Extension of the ‘Inorganic Gel Casting’ Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams Rincon Romero, Acacio Tamburini, Sergio Taveri, Gianmarco Toušek, Jaromír Dlouhy, Ivo Bernardo, Enrico Materials (Basel) Article A new technique for the production of glass foams, based on alkali activation and gel casting, previously applied to soda-lime glass, was successfully extended to boro-alumino-silicate glass, recovered from the recycling of pharmaceutical vials. A weak alkali activation (2.5 M NaOH or NaOH/KOH aqueous solutions) of fine glass powders (below 70 µm) allowed for the obtainment of well-dispersed concentrated aqueous suspensions, undergoing gelation by treatment at low temperature (75 °C). Unlike soda-lime glass, the progressive hardening could not be attributed to the formation of calcium-rich silicate hydrates. The gelation was provided considering the chemical formulation of pharmaceutical glass (CaO-free) to the formation of hydrated sodium alumino-silicate (N-A-S-H) gel. An extensive direct foaming was achieved by vigorous mechanical stirring of partially gelified suspensions, comprising also a surfactant. A sintering treatment at 700 °C, was finally applied to stabilize the cellular structures. MDPI 2018-12-14 /pmc/articles/PMC6316894/ /pubmed/30558154 http://dx.doi.org/10.3390/ma11122545 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Rincon Romero, Acacio
Tamburini, Sergio
Taveri, Gianmarco
Toušek, Jaromír
Dlouhy, Ivo
Bernardo, Enrico
Extension of the ‘Inorganic Gel Casting’ Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams
title Extension of the ‘Inorganic Gel Casting’ Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams
title_full Extension of the ‘Inorganic Gel Casting’ Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams
title_fullStr Extension of the ‘Inorganic Gel Casting’ Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams
title_full_unstemmed Extension of the ‘Inorganic Gel Casting’ Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams
title_short Extension of the ‘Inorganic Gel Casting’ Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams
title_sort extension of the ‘inorganic gel casting’ process to the manufacturing of boro-alumino-silicate glass foams
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6316894/
https://www.ncbi.nlm.nih.gov/pubmed/30558154
http://dx.doi.org/10.3390/ma11122545
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