Quantitative assessment of ceramic suspension stability using a LUMiSizer analytical centrifuge

Sokola, Patrik (avtor), Skalar, Tina (avtor), Šiler, Pavel (avtor), Blahut, Jan (avtor), Kalina, Michal (avtor), Veteška, Peter (avtor), Ptáček, Petr (avtor)

The stability of ceramic suspensions is a key factor in the preparation and shaping of ceramic bodies. The presented work offers an experimental determination of ceramics suspensions stability using the LUMiSizer analytical centrifuge, focusing on kinetic behaviour using transmission profiles and instability indexes. Multiple ceramic systems comprising corundum, metakaolin, and zirconia suspensions were experimentally examined under varying solid contents, dispersant dosages, and additive concentrations. Results showed that highly loaded corundum suspensions with dispersant (Dolapix CE64) achieved excellent stability, with an instability index below 0.05. Compared to classical sedimentation tests, which are time-consuming and not highly sensitive, LUMiSizer offers a suitable alternative by guaranteeing correct kinetic data and instability indexes indicating suspension behaviour using centrifugal force. Comparisons of the LUMiSizer results and data obtained using the modified Stokes law confirmed increased terminal velocities in experiments with metakaolin suspensions, indicating the sensitivity of the centrifuge to the effect of dispersion medium shape. The influence of porogen (waste coffee grounds) on the stability of corundum suspensions was also investigated, followed by slip casting to create and characterize a ceramic body, confirming the possibility of shaping based on stability results. Furthermore, instability indices are suggested as a rapid, quantitative method for comparing system stability and as an auxiliary criterion to the rheological measurements. Optimal dispersant concentration for zirconia-based photocurable suspensions was identified as 8.5 wt.%, which minimized viscosity and, at the same time, assured maximal kinetic stability. Integrating the LUMiSizer analytical centrifuge with standard methods, including sedimentation tests and rheological measurements, highlights its value as a powerful tool for characterizing and optimizing ceramic suspensions.

• Jezik: Angleški jezik
• Ključne besede: sedimentation, corundum, zirconia
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 18 str.
• Številčenje: Vol. 8, iss. 3, art. 115
• PID: 20.500.12556/RUL-175437
• UDK: 620.1:549.517.1
• ISSN pri članku: 2571-6131
• DOI: 10.3390/ceramics8030115
• COBISS.SI-ID: 251901443
• Datum objave v RUL: 27.10.2025

Gradivo je del revije

• Naslov: Ceramics
• Skrajšan naslov: Ceramics
• Založnik: MDPI
• ISSN: 2571-6131
• COBISS.SI-ID: 31835943

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: sedimentacija, korund, cirkonijev oksid

Projekti

• Financer: Ministry of Education, Youth and Sports of the Czech Republic
• Številka projekta: FCH-S-25-8836