20.500.12556/RUL-180794 New empirical rheological model for ceramics suspensions based on a hyperbolic sine formulation Understanding the rheological behavior of ceramic suspensions is crucial for optimizing shaping technologies, including slip casting, injection molding, and additive manufacturing. Classical models often fail to account for temperature effects, interfacial phenomena, and nonlinear concentration effects, thereby limiting their applicability to real processing conditions. This study introduces a new empirical rheological model based on a hyperbolic sine formulation, incorporating three physically interpretable parameters: the effective Einstein limit offset (A), the mixing viscosity factor (β), and the interaction viscosity factor (C), verified in the concentration range 0–40 vol.%. Unlike conventional viscosity–concentration relationships, the proposed model captures the first measurable deviation from the dilute Einstein regime and describes the progressive nonlinear rise of relative viscosity using a compact analytical expression. The parameter β captures the effects of interfacial tension, liquid viscosity, and effective particle number density under isothermal conditions, as confirmed by its temperature and shear-dependent decrease and by its reduction in dispersant-stabilized suspensions, where steric layers diminish particle interactions. Therefore, parameter β provides a physically grounded link between the suspension structure and its rheological response. The model demonstrates excellent agreement with experimental data, outperforming five established rheological models across multiple systems and measurement conditions. These findings highlight the novelty of the proposed formulation as both a flexible fitting tool and a physically meaningful descriptor of early-stage viscosity evolution. rheology relative viscosity mathematical fitting ceramic suspension fitting parameters reologija relativna viskoznost matematično prilagajanje keramična suspenzija parametri prilagajanja true false true Angleški jezik Slovenski jezik Članek v reviji 2026-03-16 14:06:27 2026-03-16 14:06:29 2026-03-19 03:58:08 0000-00-00 00:00:00 2026 0 0 12 str. iss. 1, art. e70504 Vol. 109 Jan. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.1:532.135 0002-7820 10.1111/jace.70504 264322819 RAZ_Sokola_Patrik_2026.pdf RAZ_Sokola_Patrik_2026.pdf 1 D8CD9CF24B69FA701F7991F4F6C8D9BA 7ac4d8297c22d5eabcb1a02ad1c59e16712d2b11d76dd09770904aef5e09a0b0 da4560b5-2139-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=230620 https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.70504 1 e63a22d5-2138-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=230618 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0