Publications

@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}

}

@article{BREDA2023,

title = {Production and mechanical characterization of Titanium Carbide ISOL target disks fabricated by direct ink writing},

author = {A. Breda and A. Zanini and A. Campagnolo and S. Corradetti and M. Manzolaro and G. Meneghetti and P. Colombo and M. Ballan and G. Franchin},

url = {https://www.sciencedirect.com/science/article/pii/S0272884223020485},

doi = {https://doi.org/10.1016/j.ceramint.2023.07.121},

issn = {0272-8842},

year  = {2023},

date = {2023-01-01},

urldate = {2023-01-01},

journal = {Ceramics International},

abstract = {Titanium carbide boasts a large variety of high-temperature applications from aerospace to electronics and is also employed as Isotope Separation On-Line target for the production of Radioactive Ion Beams, which are employed in numerous research and technological fields, ranging from nuclear physics to medical applications. High working temperature, open and tailored porosity and resistance to thermal stresses are fundamental characteristics for this kind of targets. In this work, an extrusion-based additive manufacturing technique (Direct Ink Writing) was used for the fabrication of complex three-dimensional macro-porous structures in the shape of disks with dimensions compatible for their use as targets. An ink containing a suspension of TiC powders with solid loading of 47.5 vol% was prepared and its rheological properties were investigated. Afterwards, single filaments with an average diameter of 0.36 mm were produced and characterized with four-point bending tests to determine the bulk material tensile strength and Young's modulus. TiC targets were then manufactured and their mechanical properties were characterized with the Ball on Three Balls approach, a biaxial flexural test suitable for disk-shaped samples. For both flexural tests, a Finite Element model was developed representatively reproducing the experimental results. The calculated tensile strength values for both filaments and disks were analyzed with Weibull's statistical approach to provide reference stress limit, corresponding to a survival probability of 99.9%.},

keywords = {Additive Manufacturing},

pubstate = {published},

tppubtype = {article}

}

@article{Elsayed2023131,

title = {Direct ink writing of silicone/filler mixtures for sphene scaffolds with advanced topologies},

author = {H. Elsayed and L. Grigolato and G. Savio and P. Colombo and E. Bernardo},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136591063&doi=10.1111%2fijac.14168&partnerID=40&md5=0f6d944d98d2c53ca6f38bcf1cc75927},

doi = {10.1111/ijac.14168},

year  = {2023},

date = {2023-01-01},

journal = {International Journal of Applied Ceramic Technology},

volume = {20},

number = {1},

pages = {131--140},

keywords = {Additive Manufacturing},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@article{Morais2023,

title = {Additive manufacturing of calcium carbonate parts through vat-photopolymerization and sintering in carbon dioxide atmosphere},

author = {M. M. Morais and I. L. D. Camargo and P. Colombo and C. A. Fortulan},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85150826481&doi=10.1016%2fj.oceram.2023.100348&partnerID=40&md5=d163bef392a3abd7e199ab4957714c81},

doi = {10.1016/j.oceram.2023.100348},

year  = {2023},

date = {2023-01-01},

journal = {Open Ceramics},

volume = {14},

keywords = {Additive Manufacturing},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@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}

}

@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}

}

@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}

}

@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}

}

@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}

}

@article{Yao2023,

title = {Multifunctional Metamaterial Microwave Blackbody with High-Frequency Compatibility, Temperature Insensitivity, and Structural Scalability},

author = {L. Yao and S. Zhou and L. Pan and H. Mei and Y. Li and K. G. Dassios and P. Colombo and L. Cheng and L. Zhang},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85142643286&doi=10.1002%2fadfm.202209340&partnerID=40&md5=5f68487c884f637b0cbd62ded6c1740c},

doi = {10.1002/adfm.202209340},

year  = {2023},

date = {2023-01-01},

journal = {Advanced Functional Materials},

volume = {33},

number = {5},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Liu2023,

title = {Structural Electromagnetic Absorber Based on MoS2/PyC-Al2O3 Ceramic Metamaterials},

author = {X. Liu and H. Liu and H. Wu and Q. Zhou and H. Liang and G. Liu and W. Duan and Y. Gu and C. Xu and N. Travitzky and P. Colombo and R. Riedel},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85153500576&doi=10.1002%2fsmll.202300664&partnerID=40&md5=bea34644258ac17ad6ed743533e849d5},

doi = {10.1002/smll.202300664},

year  = {2023},

date = {2023-01-01},

journal = {Small},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@article{Li2023,

title = {Enhanced mechanical properties of 3D printed alumina ceramics by using sintering aids},

author = {H. Li and H. Elsayed and P. Colombo},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85156210231&doi=10.1016%2fj.ceramint.2023.05.025&partnerID=40&md5=ae047c3add9ffb5ab26c85ecdaae2bb6},

doi = {10.1016/j.ceramint.2023.05.025},

year  = {2023},

date = {2023-01-01},

journal = {Ceramics International},

keywords = {Additive Manufacturing},

pubstate = {published},

tppubtype = {article}

}

@article{DeMarzi2023,

title = {Development of robot assisted hybrid additive manufacturing technology for the freeform fabrication of lattice structures},

author = {A. De Marzi and M. Vibrante and M. Bottin and G. Franchin},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85148960460&doi=10.1016%2fj.addma.2023.103456&partnerID=40&md5=4a445c3f21991572b69adac9a4d48139},

doi = {10.1016/j.addma.2023.103456},

year  = {2023},

date = {2023-01-01},

urldate = {2023-01-01},

journal = {Additive Manufacturing},

volume = {66},

keywords = {Additive Manufacturing},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@article{Bernardo2022,

title = {Double-life sustainable construction materials from alkali activation of volcanic ash/discarded glass mixture},

author = {E. Bernardo and H. Elsayed and A. Mazzi and G. Tameni and S. Gazzo and L. Contrafatto},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85140450855&doi=10.1016%2fj.conbuildmat.2022.129540&partnerID=40&md5=50cfba50bbcd3815a2b3ca13b759d0f8},

doi = {10.1016/j.conbuildmat.2022.129540},

year  = {2022},

date = {2022-01-01},

journal = {Construction and Building Materials},

volume = {359},

keywords = {Materials for the environment},

pubstate = {published},

tppubtype = {article}

}

@article{Mahmoud2022,

title = {Advanced Dye Sorbents from Combined Stereolithography 3D Printing and Alkali Activation of Pharmaceutical Glass Waste},

author = {M. Mahmoud and J. Kraxner and H. Elsayed and D. Galusek and E. Bernardo},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85139981975&doi=10.3390%2fma15196823&partnerID=40&md5=573421d9a025c5f4d953f2a4e96146dc},

doi = {10.3390/ma15196823},

year  = {2022},

date = {2022-01-01},

journal = {Materials},

volume = {15},

number = {19},

keywords = {Additive Manufacturing, Materials for the environment},

pubstate = {published},

tppubtype = {article}

}