2025
L. Lattanzi; A. Conte; A. Sin; J. M. Garcia; C. A. Randall; P. Colombo
Cold sintering of geopolymer powders Journal Article
In: Journal of the American Ceramic Society, vol. 108, no. 4, pp. e20331, 2025.
Abstract | Links | BibTeX | Tags: Materials for the environment
@article{https://doi.org/10.1111/jace.20331,
title = {Cold sintering of geopolymer powders},
author = {L. Lattanzi and A. Conte and A. Sin and J. M. Garcia and C. A. Randall and P. Colombo},
url = {https://ceramics.onlinelibrary.wiley.com/doi/abs/10.1111/jace.20331},
doi = {https://doi.org/10.1111/jace.20331},
year = {2025},
date = {2025-01-01},
urldate = {2025-01-01},
journal = {Journal of the American Ceramic Society},
volume = {108},
number = {4},
pages = {e20331},
abstract = {Abstract Geopolymers (GP) represent a promising class of inorganic materials with diverse applications due to their properties, including high temperature resistance and strong interfacial bonding ability. They are produced through alkali activation of aluminosilicate sources, such as metakaolin or fly ashes. Despite their attractive characteristics, conventional casting methods for GP production often result in prolonged curing times and inferior mechanical properties to OPC or other benchmark materials. In this study, we investigated the feasibility of rapidly densifying GP matrices using cold sintering technology (CSP), a novel approach previously employed in ceramic systems. Through CSP, it was possible to obtain a dense body starting from GP sodium-based powder with optimal moisture content (10% wt.) under mild isostatic pressure (70 MPa) and moderate temperature (150°C) conditions, with a short duration process (10 min). The resulting products exhibited chemical stability (high resistance to boiling test), high density (> 90% theoretical density) and good mechanical properties (flexural strength equal to 30 MPa and compressive strength over 200 MPa) without requiring additional thermal treatments. SEM, EDS and NMR studies indicated that the predominant densification mechanism was likely to be homogeneous dissolutions and precipitation of the material, consistent with pressure solution creep. Dilatometric tests were performed to track the densification process in real-time and to determine the activation energy, which revealed an exceptionally low value for the system (21.7 kJ/mol). Our results demonstrate the potential of CSP as a rapid and efficient method for producing high-quality GP-based components, paving the way for their broader application in various fields.},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
Abstract Geopolymers (GP) represent a promising class of inorganic materials with diverse applications due to their properties, including high temperature resistance and strong interfacial bonding ability. They are produced through alkali activation of aluminosilicate sources, such as metakaolin or fly ashes. Despite their attractive characteristics, conventional casting methods for GP production often result in prolonged curing times and inferior mechanical properties to OPC or other benchmark materials. In this study, we investigated the feasibility of rapidly densifying GP matrices using cold sintering technology (CSP), a novel approach previously employed in ceramic systems. Through CSP, it was possible to obtain a dense body starting from GP sodium-based powder with optimal moisture content (10% wt.) under mild isostatic pressure (70 MPa) and moderate temperature (150°C) conditions, with a short duration process (10 min). The resulting products exhibited chemical stability (high resistance to boiling test), high density (> 90% theoretical density) and good mechanical properties (flexural strength equal to 30 MPa and compressive strength over 200 MPa) without requiring additional thermal treatments. SEM, EDS and NMR studies indicated that the predominant densification mechanism was likely to be homogeneous dissolutions and precipitation of the material, consistent with pressure solution creep. Dilatometric tests were performed to track the densification process in real-time and to determine the activation energy, which revealed an exceptionally low value for the system (21.7 kJ/mol). Our results demonstrate the potential of CSP as a rapid and efficient method for producing high-quality GP-based components, paving the way for their broader application in various fields.
G. Tameni; D. Lago; H. Kaňková; L. Buňová; J. Kraxner; D. Galusek; D. M. Dawson; S. E. Ashbrook; E. Bernardo
Alkaline attack of boro-alumino-silicate glass: New insights of the molecular mechanism of cold consolidation and new applications Journal Article
In: Open Ceramics, vol. 21, 2025, (Cited by: 0; All Open Access, Gold Open Access).
Links | BibTeX | Tags: Materials for the environment
@article{Tameni2025,
title = {Alkaline attack of boro-alumino-silicate glass: New insights of the molecular mechanism of cold consolidation and new applications},
author = {G. Tameni and D. Lago and H. Kaňková and L. Buňová and J. Kraxner and D. Galusek and D. M. Dawson and S. E. Ashbrook and E. Bernardo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85213004207&doi=10.1016%2fj.oceram.2024.100726&partnerID=40&md5=00a43152438bfcaacfcd8003f6f709c4},
doi = {10.1016/j.oceram.2024.100726},
year = {2025},
date = {2025-01-01},
urldate = {2025-01-01},
journal = {Open Ceramics},
volume = {21},
note = {Cited by: 0; All Open Access, Gold Open Access},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
2024
E. Cepollaro; S. Cimino; M. D'Agostini; N. Gargiulo; G. Franchin; L. Lisi
3D-Printed Monoliths Based on Cu-Exchanged SSZ-13 as Catalyst for SCR of NOx Journal Article
In: Catalysts, vol. 14, iss. 1, no. 85, 2024.
Abstract | Links | BibTeX | Tags: Additive Manufacturing, Materials for the environment
@article{nokey,
title = {3D-Printed Monoliths Based on Cu-Exchanged SSZ-13 as Catalyst for SCR of NOx},
author = {E. Cepollaro and S. Cimino and M. D'Agostini and N. Gargiulo and G. Franchin and L. Lisi},
doi = {10.3390/catal14010085},
year = {2024},
date = {2024-01-19},
urldate = {2024-01-19},
journal = {Catalysts},
volume = {14},
number = {85},
issue = {1},
abstract = {Monoliths manufactured by Direct Ink Writing containing 60% SSZ-13 (SiO2/Al2O3 = 23) and SiO2 with 10% laponite as a binder were investigated as self-standing structured catalysts for NH3-SCR of NOx after a short (4 h) and prolonged (24 h) ion exchange with copper and then compared with pure SSZ-13 exchanged under the same conditions. The catalysts were characterized by morphological (XRD and SEM), textural (BET and pore size distribution), chemical (ICP-MS), red-ox (H2-TPR), and surface (NH3-TPD) analyses. The silica-based binder uniformly covered the SSZ-13 particles, and copper was uniformly distributed as well. The main features of the pure Cu-exchanged SSZ-13 zeolite were preserved in the composite monoliths with a negligible contribution of the binder fraction. NH3-SCR tests, carried out on both monolithic and powdered samples in the temperature range of 70–550 °C, showed that composite monoliths provided very good activity, and that the intrinsic activity of SSZ-13 was enhanced by the hierarchical structure of the composite material.},
keywords = {Additive Manufacturing, Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
Monoliths manufactured by Direct Ink Writing containing 60% SSZ-13 (SiO2/Al2O3 = 23) and SiO2 with 10% laponite as a binder were investigated as self-standing structured catalysts for NH3-SCR of NOx after a short (4 h) and prolonged (24 h) ion exchange with copper and then compared with pure SSZ-13 exchanged under the same conditions. The catalysts were characterized by morphological (XRD and SEM), textural (BET and pore size distribution), chemical (ICP-MS), red-ox (H2-TPR), and surface (NH3-TPD) analyses. The silica-based binder uniformly covered the SSZ-13 particles, and copper was uniformly distributed as well. The main features of the pure Cu-exchanged SSZ-13 zeolite were preserved in the composite monoliths with a negligible contribution of the binder fraction. NH3-SCR tests, carried out on both monolithic and powdered samples in the temperature range of 70–550 °C, showed that composite monoliths provided very good activity, and that the intrinsic activity of SSZ-13 was enhanced by the hierarchical structure of the composite material.
A. W. Ourgessa; J. Kraxner; H. Elsayed; D. Galusek; E. Bernardo
Sustainable construction materials from alkali-activated waste fiberglass and waste refractory Journal Article
In: Open Ceramics, vol. 20, pp. 100678, 2024, ISSN: 2666-5395.
Abstract | Links | BibTeX | Tags: Materials for the environment
@article{OURGESSA2024100678,
title = {Sustainable construction materials from alkali-activated waste fiberglass and waste refractory},
author = {A. W. Ourgessa and J. Kraxner and H. Elsayed and D. Galusek and E. Bernardo},
url = {https://www.sciencedirect.com/science/article/pii/S2666539524001421},
doi = {https://doi.org/10.1016/j.oceram.2024.100678},
issn = {2666-5395},
year = {2024},
date = {2024-01-01},
urldate = {2024-01-01},
journal = {Open Ceramics},
volume = {20},
pages = {100678},
abstract = {In this work, waste fiberglass was up-cycled, alone, or mixed with used alumina-zirconia-silica (AZS) refractory from dismantled glass melting furnaces. Alkali activation was performed by suspending fiberglass and fiberglass/AZS powders in NaOH aqueous solution of various concentrations (8M, 6M, and 3M). The activation of waste fiberglass with 8M NaOH yields a gel with calcium and sodium-containing aluminosilicate hydrates. The addition of AZS refractory enabled the release of aluminates into the solution, which had beneficial effects on the mechanical properties. Low molarity activation yielded weaker materials which could be used as precursors for firing at moderate temperatures (800 °C and 1000 °C) to create cellular glass-ceramics, with a total porosity of up to 92 %. The firing of 8M activated samples resulted in glass ceramics with a 66–75 % porosity range and compressive strength of 10–23Mpa. The compressive strength-to-density ratio before and after firing was comparable to that of established commercial construction materials.},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
In this work, waste fiberglass was up-cycled, alone, or mixed with used alumina-zirconia-silica (AZS) refractory from dismantled glass melting furnaces. Alkali activation was performed by suspending fiberglass and fiberglass/AZS powders in NaOH aqueous solution of various concentrations (8M, 6M, and 3M). The activation of waste fiberglass with 8M NaOH yields a gel with calcium and sodium-containing aluminosilicate hydrates. The addition of AZS refractory enabled the release of aluminates into the solution, which had beneficial effects on the mechanical properties. Low molarity activation yielded weaker materials which could be used as precursors for firing at moderate temperatures (800 °C and 1000 °C) to create cellular glass-ceramics, with a total porosity of up to 92 %. The firing of 8M activated samples resulted in glass ceramics with a 66–75 % porosity range and compressive strength of 10–23Mpa. The compressive strength-to-density ratio before and after firing was comparable to that of established commercial construction materials.
D. Lago; G. Tameni; F. Zorzi; J. Kraxner; D. Galusek; E. Bernardo
Novel cesium immobilization by alkali activation and cold consolidation of waste pharmaceutical glass Journal Article
In: Journal of Cleaner Production, vol. 461, 2024, (Cited by: 1; All Open Access, Hybrid Gold Open Access).
Links | BibTeX | Tags: Materials for the environment
@article{Lago2024,
title = {Novel cesium immobilization by alkali activation and cold consolidation of waste pharmaceutical glass},
author = {D. Lago and G. Tameni and F. Zorzi and J. Kraxner and D. Galusek and E. Bernardo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85194095471&doi=10.1016%2fj.jclepro.2024.142673&partnerID=40&md5=954ab91e99c2519d54b0063aedd6394b},
doi = {10.1016/j.jclepro.2024.142673},
year = {2024},
date = {2024-01-01},
urldate = {2024-01-01},
journal = {Journal of Cleaner Production},
volume = {461},
note = {Cited by: 1; All Open Access, Hybrid Gold Open Access},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
D. Lago; G. Tameni; J. Kraxner; D. Galusek; E. Bernardo
Cesium stabilization by engineered alkaline attack of glass for pharmaceutical containers Journal Article
In: Materials Letters, vol. 372, 2024, (Cited by: 0).
Links | BibTeX | Tags: Materials for the environment
@article{Lago2024b,
title = {Cesium stabilization by engineered alkaline attack of glass for pharmaceutical containers},
author = {D. Lago and G. Tameni and J. Kraxner and D. Galusek and E. Bernardo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85199962040&doi=10.1016%2fj.matlet.2024.137097&partnerID=40&md5=0cf00a128d65142220b095702ecb01d4},
doi = {10.1016/j.matlet.2024.137097},
year = {2024},
date = {2024-01-01},
urldate = {2024-01-01},
journal = {Materials Letters},
volume = {372},
note = {Cited by: 0},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
F. Cammelli; G. Tameni; E. Bernardo
Sustainable stabilization of waste foundry sands in alkali activated glass-based matrices Journal Article
In: Case Studies in Construction Materials, vol. 21, 2024, (Cited by: 0; All Open Access, Hybrid Gold Open Access).
Links | BibTeX | Tags: Materials for the environment
@article{Cammelli2024,
title = {Sustainable stabilization of waste foundry sands in alkali activated glass-based matrices},
author = {F. Cammelli and G. Tameni and E. Bernardo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85199569634&doi=10.1016%2fj.cscm.2024.e03538&partnerID=40&md5=b9f2019609974f651aa1945049786175},
doi = {10.1016/j.cscm.2024.e03538},
year = {2024},
date = {2024-01-01},
urldate = {2024-01-01},
journal = {Case Studies in Construction Materials},
volume = {21},
note = {Cited by: 0; All Open Access, Hybrid Gold Open Access},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
2023
N. Shezad; M. D'Agostini; A. Ezzine; G. Franchin; P. Colombo; F. Akhtar
3D-printed zeolite 13X-Strontium chloride units as ammonia carriers Journal Article
In: Heliyon, pp. e19376, 2023, ISSN: 2405-8440.
Abstract | Links | BibTeX | Tags: Additive Manufacturing, Materials for the environment
@article{SHEZAD2023e19376,
title = {3D-printed zeolite 13X-Strontium chloride units as ammonia carriers},
author = {N. Shezad and M. D'Agostini and A. Ezzine and G. Franchin and P. Colombo and F. Akhtar},
url = {https://www.sciencedirect.com/science/article/pii/S2405844023065842},
doi = {https://doi.org/10.1016/j.heliyon.2023.e19376},
issn = {2405-8440},
year = {2023},
date = {2023-08-22},
urldate = {2023-08-22},
journal = {Heliyon},
pages = {e19376},
abstract = {The selective catalytic reduction (SCR) system in automobile using urea solution as a source of NH3 suffer from solid deposit problem in pipe lines and poor efficiency during engine startup. Although direct use of high pressure NH3 is restricted due to safety concern, which can be overcome by using solid sorbents as NH3 carrier. Strontium chloride (SrCl2) is considered the best sorbent due to its high sorption capacity; however, challenges are associated with the processing of stable engineering structures due to extraordinary volume expansion during the NH3 sorption. This study reports the fabrication of a novel structure consisting of a zeolite cage enclosing the SrCl2 pellet (SPZC) through extrusion-based 3D printing (Direct Ink Writing). The printed SPZC structure demonstrated steady sorption of NH3 for 10 consecutive cycles without significant uptake capacity and structural integrity loss. Furthermore, the structure exhibited improved sorption and desorption kinetics than pure SrCl2. The synergistic effect of zeolite as physisorbent and SrCl2 as chemisorbent in the novel composite structure enabled the low-pressure (<0.4 bar) and high-pressure (>0.4 bar) NH3 sorption, compared to pure SrCl2, which absorbed NH3 at pressures above 0.4 bar. Regeneration of SPZC composite sorbent under evacuation showed that 87.5% percent of NH3 was desorbed at 20 °C. Thus, the results demonstrate that the rationally designed novel SPZC structure offers safe and efficient storage of NH3 in the SCR system and other applications.},
keywords = {Additive Manufacturing, Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
The selective catalytic reduction (SCR) system in automobile using urea solution as a source of NH3 suffer from solid deposit problem in pipe lines and poor efficiency during engine startup. Although direct use of high pressure NH3 is restricted due to safety concern, which can be overcome by using solid sorbents as NH3 carrier. Strontium chloride (SrCl2) is considered the best sorbent due to its high sorption capacity; however, challenges are associated with the processing of stable engineering structures due to extraordinary volume expansion during the NH3 sorption. This study reports the fabrication of a novel structure consisting of a zeolite cage enclosing the SrCl2 pellet (SPZC) through extrusion-based 3D printing (Direct Ink Writing). The printed SPZC structure demonstrated steady sorption of NH3 for 10 consecutive cycles without significant uptake capacity and structural integrity loss. Furthermore, the structure exhibited improved sorption and desorption kinetics than pure SrCl2. The synergistic effect of zeolite as physisorbent and SrCl2 as chemisorbent in the novel composite structure enabled the low-pressure (<0.4 bar) and high-pressure (>0.4 bar) NH3 sorption, compared to pure SrCl2, which absorbed NH3 at pressures above 0.4 bar. Regeneration of SPZC composite sorbent under evacuation showed that 87.5% percent of NH3 was desorbed at 20 °C. Thus, the results demonstrate that the rationally designed novel SPZC structure offers safe and efficient storage of NH3 in the SCR system and other applications.
F. Altimari; I. Lancellotti; C. Leonelli; F. Andreola; H. Elsayed; E. Bernardo; L. Barbieri
Green materials for construction industry from Italian volcanic quarry scraps Journal Article
In: Materials Letters, vol. 333, 2023.
Links | BibTeX | Tags: Materials for the environment
@article{Altimari2023,
title = {Green materials for construction industry from Italian volcanic quarry scraps},
author = {F. Altimari and I. Lancellotti and C. Leonelli and F. Andreola and H. Elsayed and E. Bernardo and L. Barbieri},
doi = {10.1016/j.matlet.2022.133615},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Materials Letters},
volume = {333},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
L. Contrafatto; D. Calderoni; S. Gazzo; E. Bernardo
Recycling Volcanic Ash and Glass Powder in the Production of Alkali Activated Materials Journal Article
In: Smart Innovation, Systems and Technologies, vol. 336 SIST, pp. 47–55, 2023.
Links | BibTeX | Tags: Materials for the environment
@article{Contrafatto202347,
title = {Recycling Volcanic Ash and Glass Powder in the Production of Alkali Activated Materials},
author = {L. Contrafatto and D. Calderoni and S. Gazzo and E. Bernardo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85148683771&doi=10.1007%2f978-981-19-8769-4_5&partnerID=40&md5=ddbba62e90cbfbbeb918bf88730daf3e},
doi = {10.1007/978-981-19-8769-4_5},
year = {2023},
date = {2023-01-01},
journal = {Smart Innovation, Systems and Technologies},
volume = {336 SIST},
pages = {47--55},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
H. Yang; S. Ma; S. Zhao; Q. Wang; X. Liu; P. He; D. Jia; P. Colombo; Y. Zhou
Mechanistic understanding of geopolymerization at the initial stage: Ab initio molecular dynamics simulations Journal Article
In: Journal of the American Ceramic Society, vol. 106, no. 7, pp. 4425–4442, 2023.
Links | BibTeX | Tags: Materials for the environment
@article{Yang20234425,
title = {Mechanistic understanding of geopolymerization at the initial stage: Ab initio molecular dynamics simulations},
author = {H. Yang and S. Ma and S. Zhao and Q. Wang and X. Liu and P. He and D. Jia and P. Colombo and Y. Zhou},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85150784127&doi=10.1111%2fjace.19057&partnerID=40&md5=e9191601ae9daf5b72ef3f84bc2a8432},
doi = {10.1111/jace.19057},
year = {2023},
date = {2023-01-01},
journal = {Journal of the American Ceramic Society},
volume = {106},
number = {7},
pages = {4425--4442},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
X. Li; J. Zheng; K. Zheng; F. Su; Z. Zhao; C. Bai; T. Zheng; X. Wang; Y. Qiao; P. Colombo
Rapid fabrication of coal gangue-based alkali activated foams and application as pH regulators Journal Article
In: Materials Letters, vol. 338, 2023.
Links | BibTeX | Tags: Materials for the environment
@article{Li2023c,
title = {Rapid fabrication of coal gangue-based alkali activated foams and application as pH regulators},
author = {X. Li and J. Zheng and K. Zheng and F. Su and Z. Zhao and C. Bai and T. Zheng and X. Wang and Y. Qiao and P. Colombo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85147607664&doi=10.1016%2fj.matlet.2023.134020&partnerID=40&md5=369c98c660bd261aa599babcdf900e09},
doi = {10.1016/j.matlet.2023.134020},
year = {2023},
date = {2023-01-01},
journal = {Materials Letters},
volume = {338},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
S. Ma; Y. Jiang; S. Fu; P. He; C. Sun; X. Duan; D. Jia; P. Colombo; Y. Zhou
3D-printed Lunar regolith simulant-based geopolymer composites with bio-inspired sandwich architectures Journal Article
In: Journal of Advanced Ceramics, vol. 12, no. 3, pp. 510–525, 2023.
Links | BibTeX | Tags: Additive Manufacturing, Materials for the environment
@article{Ma2023510,
title = {3D-printed Lunar regolith simulant-based geopolymer composites with bio-inspired sandwich architectures},
author = {S. Ma and Y. Jiang and S. Fu and P. He and C. Sun and X. Duan and D. Jia and P. Colombo and Y. Zhou},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85149784582&doi=10.26599%2fJAC.2023.9220700&partnerID=40&md5=5545c234bdfa4a13c1c5051aebfe1a79},
doi = {10.26599/JAC.2023.9220700},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Journal of Advanced Ceramics},
volume = {12},
number = {3},
pages = {510--525},
keywords = {Additive Manufacturing, Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
J. Shao; C. Bai; X. Li; K. Yang; T. Zheng; Y. Qiao; L. Zhang; H. Li; P. Colombo
Open-cell mullite ceramic foams derived from porous geopolymer precursors with tailored porosity Journal Article
In: Journal of Advanced Ceramics, vol. 12, no. 2, pp. 279–295, 2023.
Links | BibTeX | Tags: Materials for the environment
@article{Shao2023279,
title = {Open-cell mullite ceramic foams derived from porous geopolymer precursors with tailored porosity},
author = {J. Shao and C. Bai and X. Li and K. Yang and T. Zheng and Y. Qiao and L. Zhang and H. Li and P. Colombo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85146787264&doi=10.26599%2fJAC.2023.9220682&partnerID=40&md5=b3b6274dc3214f4179403a3c0ef359c7},
doi = {10.26599/JAC.2023.9220682},
year = {2023},
date = {2023-01-01},
journal = {Journal of Advanced Ceramics},
volume = {12},
number = {2},
pages = {279--295},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
X. Li; L. Liu; C. Bai; K. Yang; T. Zheng; S. Lu; H. Li; Y. Qiao; P. Colombo
Porous alkali-activated material from hypergolic coal gangue by microwave foaming for methylene blue removal Journal Article
In: Journal of the American Ceramic Society, vol. 106, no. 2, pp. 1473–1489, 2023.
Links | BibTeX | Tags: Materials for the environment
@article{Li20231473,
title = {Porous alkali-activated material from hypergolic coal gangue by microwave foaming for methylene blue removal},
author = {X. Li and L. Liu and C. Bai and K. Yang and T. Zheng and S. Lu and H. Li and Y. Qiao and P. Colombo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85141344000&doi=10.1111%2fjace.18812&partnerID=40&md5=269f271e066a59d948f54940540a52dc},
doi = {10.1111/jace.18812},
year = {2023},
date = {2023-01-01},
journal = {Journal of the American Ceramic Society},
volume = {106},
number = {2},
pages = {1473--1489},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
X. Li; J. Zheng; J. Shao; M. Loutou; C. Bai; Y. Qiao; Y. Miao; X. Wang; T. Zheng; P. Colombo
Evaluation of porosity, mechanical and thermal properties of self-ignition coal gangue-based foams via fast microwave foaming Journal Article
In: Journal of Building Engineering, vol. 68, 2023.
Links | BibTeX | Tags: Materials for the environment
@article{Li2023b,
title = {Evaluation of porosity, mechanical and thermal properties of self-ignition coal gangue-based foams via fast microwave foaming},
author = {X. Li and J. Zheng and J. Shao and M. Loutou and C. Bai and Y. Qiao and Y. Miao and X. Wang and T. Zheng and P. Colombo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85147946463&doi=10.1016%2fj.jobe.2023.106062&partnerID=40&md5=b46838d1308731bbba3e8b3a1ca26c59},
doi = {10.1016/j.jobe.2023.106062},
year = {2023},
date = {2023-01-01},
journal = {Journal of Building Engineering},
volume = {68},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
X. Li; J. Shao; J. Zheng; C. Bai; X. Zhang; Y. Qiao; P. Colombo
Fabrication and application of porous materials made from coal gangue: A review Journal Article
In: International Journal of Applied Ceramic Technology, 2023.
Links | BibTeX | Tags: Materials for the environment
@article{Li2023e,
title = {Fabrication and application of porous materials made from coal gangue: A review},
author = {X. Li and J. Shao and J. Zheng and C. Bai and X. Zhang and Y. Qiao and P. Colombo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85148599947&doi=10.1111%2fijac.14359&partnerID=40&md5=f9c57a385239dad1382a50e458915724},
doi = {10.1111/ijac.14359},
year = {2023},
date = {2023-01-01},
journal = {International Journal of Applied Ceramic Technology},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
M. Muracchioli; G. Menardi; M. D'Agostini; G. Franchin; P. Colombo
Modeling the compressive strength of metakaolin-based geopolymers based on the statistical analysis of experimental data Journal Article
In: Applied Clay Science, vol. 242, pp. 107020, 2023, ISSN: 0169-1317.
Abstract | Links | BibTeX | Tags: Materials for the environment
@article{MURACCHIOLI2023107020,
title = {Modeling the compressive strength of metakaolin-based geopolymers based on the statistical analysis of experimental data},
author = {M. Muracchioli and G. Menardi and M. D'Agostini and G. Franchin and P. Colombo},
url = {https://authors.elsevier.com/c/1hHC3cTCCHH3T},
doi = {https://doi.org/10.1016/j.clay.2023.107020},
issn = {0169-1317},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Applied Clay Science},
volume = {242},
pages = {107020},
abstract = {The relationship between the compressive strength of metakaolin-based geopolymer samples and different processing conditions has been investigated for both potassium and sodium based geopolymer systems. Cubic geopolymer samples were prepared by mixing the slurry for 1 h in a thermostatic bath at 0 °C. >1200 samples have been tested to gather enough data to carry out a meaningful statistical analysis. All the data evaluation and model development have been carried out extensively using R. The variation of curing and aging time, curing temperature, SiO2/Al2O3 and H2O/Al2O3 molar ratios has been accounted for via the application of statistical models whose reliability has been suitably checked. Curing has been performed in a sealed container at 100% relative humidity. Aging has been conducted in a climate chamber kept at 75% of relative humidity using an oversaturated solution of NaCl. Curing time has proved a positive relationship with compressive strength while aging time does not show evidence of any significant effect. Curing temperature negatively affects compressive strength. Increasing the SiO2/Al2O3 molar ratio results in an increase of the compressive strength within a certain range of values for the ratio; however, above a threshold (3.8 for the potassium-based and 3.4 for the sodium-based geopolymer system) the mechanical properties decrease. The H2O/Al2O3 molar ratio displayed an inverse proportionality with the compressive strength except for the sodium-based geopolymer, where the mechanical properties initially increased. A further comprehensive and statistically sound model has been proposed that allows us to predict the strength of geopolymer samples as a function of process variables and their composition, ranging in a rather wide set of values.},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
The relationship between the compressive strength of metakaolin-based geopolymer samples and different processing conditions has been investigated for both potassium and sodium based geopolymer systems. Cubic geopolymer samples were prepared by mixing the slurry for 1 h in a thermostatic bath at 0 °C. >1200 samples have been tested to gather enough data to carry out a meaningful statistical analysis. All the data evaluation and model development have been carried out extensively using R. The variation of curing and aging time, curing temperature, SiO2/Al2O3 and H2O/Al2O3 molar ratios has been accounted for via the application of statistical models whose reliability has been suitably checked. Curing has been performed in a sealed container at 100% relative humidity. Aging has been conducted in a climate chamber kept at 75% of relative humidity using an oversaturated solution of NaCl. Curing time has proved a positive relationship with compressive strength while aging time does not show evidence of any significant effect. Curing temperature negatively affects compressive strength. Increasing the SiO2/Al2O3 molar ratio results in an increase of the compressive strength within a certain range of values for the ratio; however, above a threshold (3.8 for the potassium-based and 3.4 for the sodium-based geopolymer system) the mechanical properties decrease. The H2O/Al2O3 molar ratio displayed an inverse proportionality with the compressive strength except for the sodium-based geopolymer, where the mechanical properties initially increased. A further comprehensive and statistically sound model has been proposed that allows us to predict the strength of geopolymer samples as a function of process variables and their composition, ranging in a rather wide set of values.
C. Bagci; G. Tameni; H. Elsayed; E. Bernardo
Sustainable manufacturing of new construction material from alkali activation of volcanic tuff Journal Article
In: Materials Today Communications, vol. 36, pp. 106645, 2023, ISSN: 2352-4928.
Abstract | Links | BibTeX | Tags: Materials for the environment
@article{BAGCI2023106645,
title = {Sustainable manufacturing of new construction material from alkali activation of volcanic tuff},
author = {C. Bagci and G. Tameni and H. Elsayed and E. Bernardo},
url = {https://www.sciencedirect.com/science/article/pii/S2352492823013363},
doi = {https://doi.org/10.1016/j.mtcomm.2023.106645},
issn = {2352-4928},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Materials Today Communications},
volume = {36},
pages = {106645},
abstract = {The current climate emergency leads to reduction of virgin raw material extraction and promotes circular economy. In this framework, alkali activation of unemployed fraction of grey tuff, combined with glass waste, provides a range of sustainable construction materials. For the sake of sustainability, tuff powder was subjected to rapid attack (30 min), operated by a ‘weak’ alkaline solution (3 M NaOH), and then left to dry at low temperature (75 °C) for 72 h. The addition of Triton X-100 surfactant was considered to obtain foams starting from slurries with different liquid-to-solid ratio. A thermal treatment was applied to selected samples, at low temperature (700 °C). Despite the ‘mild’ activation conditions, all products survived after immersion in boiling water or acid solution, already in the unfired state, according to the formation of a multiphasic gel. The strength-to-density ratio, especially for foams, in both unfired and fired form, compares well with that of already existing construction materials (e.g. it could exceed 5 MPa cm3/g).},
keywords = {Materials for the environment},
pubstate = {published},
tppubtype = {article}
}
The current climate emergency leads to reduction of virgin raw material extraction and promotes circular economy. In this framework, alkali activation of unemployed fraction of grey tuff, combined with glass waste, provides a range of sustainable construction materials. For the sake of sustainability, tuff powder was subjected to rapid attack (30 min), operated by a ‘weak’ alkaline solution (3 M NaOH), and then left to dry at low temperature (75 °C) for 72 h. The addition of Triton X-100 surfactant was considered to obtain foams starting from slurries with different liquid-to-solid ratio. A thermal treatment was applied to selected samples, at low temperature (700 °C). Despite the ‘mild’ activation conditions, all products survived after immersion in boiling water or acid solution, already in the unfired state, according to the formation of a multiphasic gel. The strength-to-density ratio, especially for foams, in both unfired and fired form, compares well with that of already existing construction materials (e.g. it could exceed 5 MPa cm3/g).
2022
G. Franchin; H. Elsayed; R. Botti; K. Huang; J. Schmidt; G. Giometti; A. Zanini; A. De Marzi; M. D'Agostini; P. Scanferla; Y. Feng; P. Colombo
Additive Manufacturing of Ceramics from Liquid Feedstocks Journal Article
In: Chinese Journal of Mechanical Engineering: Additive Manufacturing Frontiers, vol. 1, no. 1, pp. 100012, 2022, ISSN: 2772-6657.
Abstract | Links | BibTeX | Tags: Additive Manufacturing, Materials for the environment, Polymer-derived ceramics
@article{FRANCHIN2022100012,
title = {Additive Manufacturing of Ceramics from Liquid Feedstocks},
author = {G. Franchin and H. Elsayed and R. Botti and K. Huang and J. Schmidt and G. Giometti and A. Zanini and A. De Marzi and M. D'Agostini and P. Scanferla and Y. Feng and P. Colombo},
url = {https://www.sciencedirect.com/science/article/pii/S2772665722000022},
doi = {https://doi.org/10.1016/j.cjmeam.2022.100012},
issn = {2772-6657},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Chinese Journal of Mechanical Engineering: Additive Manufacturing Frontiers},
volume = {1},
number = {1},
pages = {100012},
abstract = {In this review, we summarize the research activities carried out by our research group at the University of Padova on the additive manufacturing of ceramics from liquid feedstocks. Particularly, we evaluate the use of preceramic polymers, geopolymers, and sol-gel solutions. We mainly focus on processing with liquid feedstocks because they have some advantages with respect to slurry-based feedstocks in which powders are present. Particularly, lower viscosity, enhanced transparency, and lack of scattering and sedimentation are advantageous features for vat photopolymerization processes, whereas the absence of particulates reduces clogging problems at the nozzle for extrusion-based processes. Simultaneously, preceramic polymers and geopolymers have some limitations in terms of the range of ceramic compositions that can be obtained; sol-gel solutions are intrinsically unstable, whereas printed objects suffer from drying issues. Nevertheless, we successfully produced high-quality parts using a variety of additive manufacturing techniques, some of which (e.g., volumetric additive manufacturing) have been proposed for the fabrication of ceramic components for the first time.},
keywords = {Additive Manufacturing, Materials for the environment, Polymer-derived ceramics},
pubstate = {published},
tppubtype = {article}
}
In this review, we summarize the research activities carried out by our research group at the University of Padova on the additive manufacturing of ceramics from liquid feedstocks. Particularly, we evaluate the use of preceramic polymers, geopolymers, and sol-gel solutions. We mainly focus on processing with liquid feedstocks because they have some advantages with respect to slurry-based feedstocks in which powders are present. Particularly, lower viscosity, enhanced transparency, and lack of scattering and sedimentation are advantageous features for vat photopolymerization processes, whereas the absence of particulates reduces clogging problems at the nozzle for extrusion-based processes. Simultaneously, preceramic polymers and geopolymers have some limitations in terms of the range of ceramic compositions that can be obtained; sol-gel solutions are intrinsically unstable, whereas printed objects suffer from drying issues. Nevertheless, we successfully produced high-quality parts using a variety of additive manufacturing techniques, some of which (e.g., volumetric additive manufacturing) have been proposed for the fabrication of ceramic components for the first time.