Category: Scientific papers

Yield stress modelling of doped alumina suspensions for applications in freeze granulation: towards dry pressed transparent ceramics M Stuer; P Bowen Rheology of powder suspensions is a key factor in many processing routes, and better understanding of the parameters that control the rheology improves technical progress by reducing the empirical factors in the formulation of… Continue reading Freeze Granulation: towards dry pressed transparent ceramics

Mechanical and functional properties of Al2O3–ZrO2–MWCNTs nanocomposites Martin Michálek Monika Kašiarová Monika Michálková Dušan Galusek Multi-walled carbon nanotubes (MWCNTs) are often reported as additives improving mechanical and functional properties of ceramic composites. However, despite tremendous efforts in the field in the past 20 years, the results are still inconclusive. This paper studies room temperature properties… Continue reading Freeze Granulation of Al2O3-ZrO2-MWCNTs nanocomposites

Spray freeze drying of YSZ nanopowder

Fostering the properties of Zr0.8Sn0.2TiO4 (ZST) ceramics via freeze granulation without sintering additives S. M. Olhero,   Ajay Kaushal and   J. M. F. Ferreira The present paper reports the overall benefits of freeze granulation for enhancing the properties of zirconium tin titanate Zr0.8Sn0.2TiO4 (ZST) ceramics in the total absence of sintering additives. The ZST powder was synthesized… Continue reading ZST ceramics via freeze granulation

A comparison between spray drying and spray freeze drying for dry powder inhaler formulation of drug-loaded lipid–polymer hybrid nanoparticles

Spray-freeze-drying for protein powder preparation: particle characterization and a case study with trypsinogen stability Sonner C, Maa YF, Lee G This work investigates the use of spray freeze-drying (SFD) to produce protein loaded particles suitable for epidermal delivery. In the first part of the study, the effects of formulation and process conditions on particle properties are… Continue reading Spray-freeze-drying for protein powder preparation

Impedance analysis of 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 ceramics consolidated from micro-granules Abstract This work aims to contribute new data on the dielectric relaxation behavior of the lead-free piezoelectric 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 (BZT–BCT) material processed in aqueous media. To obtain a BZT–BCT ceramic with high density, an aqueous suspension of BZT–BCT material was successfully transferred to spherical granules via freeze granulation,… Continue reading Impedance analysis of 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 ceramics consolidated from micro-granules

New approach for distribution of carbon nanotubes in alumina matrix Ondrej Hanzel, , Jaroslav Sedláček , Pavol Šajgalík Alumina–carbon nanotubes composites were studied with respect to obtain the homogeneous distribution of nanotubes within the alumina matrix. Disaggregation and uniform dispersion of carbon nanotubes in alumina matrix are crucial requirements for improvement fracture toughness and also… Continue reading Freeze Granulation for distribution of carbon nanotubes in alumina matrix