Extrudability of geopolymers and control of the formed networks by zeta potential and NMR spectroscopy
Abstract In this study, the local‐scale structure of geopolymers shaped by extrusion or 3D printing was investigated and correlated to the reactivity of the raw materials. The reactivity of the different metakaolin mixtures was evaluated using zeta potential measurements with different alkali silica...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-01-01
|
| Series: | International Journal of Ceramic Engineering & Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ces2.10244 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832592395085021184 |
|---|---|
| author | Wilfried Cyrille N'Cho Ameni Gharzouni Isabel Sobrados Jenny Jouin Anne Aimable Sylvie Rossignol |
| author_facet | Wilfried Cyrille N'Cho Ameni Gharzouni Isabel Sobrados Jenny Jouin Anne Aimable Sylvie Rossignol |
| author_sort | Wilfried Cyrille N'Cho |
| collection | DOAJ |
| description | Abstract In this study, the local‐scale structure of geopolymers shaped by extrusion or 3D printing was investigated and correlated to the reactivity of the raw materials. The reactivity of the different metakaolin mixtures was evaluated using zeta potential measurements with different alkali silicate solutions, followed by shaping via 3D printing; additionally, the different networks formed were identified via NMR spectroscopy. The results showed that in the presence of weakly reactive basic solutions, the Al(OH)4− species were released in low amounts due to an increase in the polymerized silicate species in the solution, resulting in a low zeta potential in absolute value. Conversely, for more reactive solutions, the silicate species were more depolymerized, and the siliceous and aluminous metakaolin species were more easily released in solution, resulting in increasingly low zeta potential values. Some samples were 3D printed with metakaolin mixtures using different printers and silicate solutions (K, KNa) with alkaline cation concentrations of [M] > 2.8 M in the mixtures; here, the metakaolin zeta potential values were greater than −50 mV, and the local‐scale structure consisted of more than 50% geopolymer networks (Q4(3Al) + Q4(2Al)). |
| format | Article |
| id | doaj-art-fe57c6fa3072481595ccef659e09ac75 |
| institution | Kabale University |
| issn | 2578-3270 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Ceramic Engineering & Science |
| spelling | doaj-art-fe57c6fa3072481595ccef659e09ac752025-01-21T08:44:30ZengWileyInternational Journal of Ceramic Engineering & Science2578-32702025-01-0171n/an/a10.1002/ces2.10244Extrudability of geopolymers and control of the formed networks by zeta potential and NMR spectroscopyWilfried Cyrille N'Cho0Ameni Gharzouni1Isabel Sobrados2Jenny Jouin3Anne Aimable4Sylvie Rossignol5IRCER: Institute for Research on Ceramics (UMR CNRS 7315), European Center for Ceramics Limoges FranceIRCER: Institute for Research on Ceramics (UMR CNRS 7315), European Center for Ceramics Limoges FranceInstituto de ciencia de materiales de Madrid, Consejo superior de investigaciones científicas (CSIC) Madrid SpainIRCER: Institute for Research on Ceramics (UMR CNRS 7315), European Center for Ceramics Limoges FranceIRCER: Institute for Research on Ceramics (UMR CNRS 7315), European Center for Ceramics Limoges FranceIRCER: Institute for Research on Ceramics (UMR CNRS 7315), European Center for Ceramics Limoges FranceAbstract In this study, the local‐scale structure of geopolymers shaped by extrusion or 3D printing was investigated and correlated to the reactivity of the raw materials. The reactivity of the different metakaolin mixtures was evaluated using zeta potential measurements with different alkali silicate solutions, followed by shaping via 3D printing; additionally, the different networks formed were identified via NMR spectroscopy. The results showed that in the presence of weakly reactive basic solutions, the Al(OH)4− species were released in low amounts due to an increase in the polymerized silicate species in the solution, resulting in a low zeta potential in absolute value. Conversely, for more reactive solutions, the silicate species were more depolymerized, and the siliceous and aluminous metakaolin species were more easily released in solution, resulting in increasingly low zeta potential values. Some samples were 3D printed with metakaolin mixtures using different printers and silicate solutions (K, KNa) with alkaline cation concentrations of [M] > 2.8 M in the mixtures; here, the metakaolin zeta potential values were greater than −50 mV, and the local‐scale structure consisted of more than 50% geopolymer networks (Q4(3Al) + Q4(2Al)).https://doi.org/10.1002/ces2.102443D printinglocal‐scalenetworkNMR spectroscopyshapingzeta potential |
| spellingShingle | Wilfried Cyrille N'Cho Ameni Gharzouni Isabel Sobrados Jenny Jouin Anne Aimable Sylvie Rossignol Extrudability of geopolymers and control of the formed networks by zeta potential and NMR spectroscopy International Journal of Ceramic Engineering & Science 3D printing local‐scale network NMR spectroscopy shaping zeta potential |
| title | Extrudability of geopolymers and control of the formed networks by zeta potential and NMR spectroscopy |
| title_full | Extrudability of geopolymers and control of the formed networks by zeta potential and NMR spectroscopy |
| title_fullStr | Extrudability of geopolymers and control of the formed networks by zeta potential and NMR spectroscopy |
| title_full_unstemmed | Extrudability of geopolymers and control of the formed networks by zeta potential and NMR spectroscopy |
| title_short | Extrudability of geopolymers and control of the formed networks by zeta potential and NMR spectroscopy |
| title_sort | extrudability of geopolymers and control of the formed networks by zeta potential and nmr spectroscopy |
| topic | 3D printing local‐scale network NMR spectroscopy shaping zeta potential |
| url | https://doi.org/10.1002/ces2.10244 |
| work_keys_str_mv | AT wilfriedcyrillencho extrudabilityofgeopolymersandcontroloftheformednetworksbyzetapotentialandnmrspectroscopy AT amenigharzouni extrudabilityofgeopolymersandcontroloftheformednetworksbyzetapotentialandnmrspectroscopy AT isabelsobrados extrudabilityofgeopolymersandcontroloftheformednetworksbyzetapotentialandnmrspectroscopy AT jennyjouin extrudabilityofgeopolymersandcontroloftheformednetworksbyzetapotentialandnmrspectroscopy AT anneaimable extrudabilityofgeopolymersandcontroloftheformednetworksbyzetapotentialandnmrspectroscopy AT sylvierossignol extrudabilityofgeopolymersandcontroloftheformednetworksbyzetapotentialandnmrspectroscopy |