Consolidation of nanoparticle suspensions by centrifugation in non-porous moulds

Trunec, Martin; Mišák, Jiří

doi:10.1016/j.ceramint.2013.12.120

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…Moreover, the similar pore size distributions in bodies pre-sintered to higher temperatures (1000 °C/1 h, 1100 °C/1 h) demonstrated homogeneous sintering without preferential densification of denser particle domains. The preferential densification of denser domains is typical of inhomogeneously packed compacts prepared from agglomerated nanoparticles and is accompanied by pore opening in the first stage of sintering [57][58][59][60]. Fig.…”

Section: Preparation and Sintering Behaviour Of Zirconia Blanksmentioning

confidence: 99%

Gelcast Zirconia Ceramics With High Strength and Simultaneously High Translucency for Dental Applications

Kaštyl

Chlup

Pouchlý

et al. 2021

Preprint

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Translucent zirconia represents a favourite material for monolithic ceramic dental restorations. However, materials approaches employed so far to improve the translucency of zirconia ceramics are accompanied by a significant decline in strength. Thus, we aimed to develop dental 3Y-TZP ceramics that can provide excellent strength and, simultaneously, enhanced translucency. In this investigation, machinable tetragonal zirconia ceramics based on fine mesostructured zirconia particles stabilized with 3 mol% of yttria and prepared by the gelcasting processing method were developed. Properties of sintered samples were characterised, namely: shrinkage, density, structure, surface roughness, hardness, biaxial strength, and total forward transmittance. Zirconia ceramics with an average biaxial strength of 1184 MPa and a total forward transmittance of 46.7% for a 0.5 mm thick sample at a wavelength of 600 nm were obtained. These ceramics exhibited homogeneous structure with grains sizes up to 620 nm and purely tetragonal phase composition. The developed ceramics provided a favourable combination of high translucency comparable even with the mixed cubic/tetragonal structure of a common 4Y-TZP, and very high strength that is achievable only in the pure tetragonal 3Y-TZP.

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Section: Preparation and Sintering Behaviour Of Zirconia Blanksmentioning

confidence: 99%

Gelcast Zirconia Ceramics With High Strength and Simultaneously High Translucency for Dental Applications

Kaštyl

Chlup

Pouchlý

et al. 2021

Preprint

Self Cite

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“…Thus, it gives way to several zones in the green bodies with different densities. 18 Samples were then collected in different spots of the green body, all along the supposed gradient line. XRD results in Table I show that the mean crystallite size increases through the sample.…”

Section: June 2016mentioning

confidence: 99%

Wet‐Route Synthesis and Characterization of Yb:CaF₂ Optical Ceramics

et al. 2016

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This paper reports a new strainless fabrication method for ytterbium‐doped CaF2 laser ceramics involving no drying step before green body casting. The nanoparticles were kept in aqueous solution until green body shaping. Centrifugation was used to obtain correct compactness of the green body before sintering. Characterizations were conducted at different steps of the fabrication process. No grain boundaries oxidation was observed in the sintered ceramics although the nanoparticles were permanently maintained in water until they were sintered. Finally, these ceramics are more homogeneous and have less light scattering defects (no porosity), and present improved optical properties when compared to ceramics obtained from dried nanopowders.

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“…Além disso, trabalhos dessa natureza são escassos na literatura. Como exemplos podem ser citados os trabalhos [22][23][24]. Nesses estudos, os autores utilizaram amostras de zircônia comercial que foram suspensas em meio ácido de modo a dispersar as nanopartículas para que as suspensões estáveis fossem centrifugadas e dessem origem a compactos semitransparentes.…”

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Dispersão e consolidação de zircônia dopada com WOx a partir do tungstato de zircônio e trietanolamina em meio aquoso

et al. 2017

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Resumo Em estudos recentes, verificou-se ser possível produzir, em meio aquoso, nanopartículas de zircônia hidratada (cristalitos inferiores a 2 nm) a partir de um precursor não usual, o tungstato de zircônio (ZrW2O8), óxido bimetálico de tamanho micrométrico (1,7 µm) e insolúvel em água. Essas nanopartículas de zircônia são capazes de formar aglomerados policristalinos transparentes à luz visível. No entanto, a produção controlada de sólidos de zircônia transparentes a partir da consolidação por centrifugação de suspensões estáveis dessas nanopartículas, desaglomeradas no momento da síntese, ainda não havia sido explorada. Dentro deste contexto, este trabalho teve por objetivo avaliar a dispersão e a consolidação de nanopartículas de zircônia hidratada produzidas a partir do ZrW2O8 em meio aquoso e utilizando-se a trietanolamina (TEOA) como surfactante, e compreender o efeito dos parâmetros experimentais empregados na dispersão sobre o teor de tungstênio remanescente nos sólidos consolidados. A síntese e dispersão foram realizadas em meio aquoso, a 80 °C, com o uso de NaOH e TEOA; em seguida, as soluções coloidais foram dialisadas, seus valores de pH foram ajustados para 6, e foram ultracentrifugadas a 28000 rpm por 24 h. Verificou-se que a utilização da TEOA na síntese permitiu a obtenção de soluções coloidais estáveis de nanopartículas de zircônia que, após centrifugação, originaram sólidos transparentes e amarelados que foram caracterizados por meio de diversas técnicas (microscopia eletrônica de varredura, espectroscopia de energia dispersiva, difração de raios X, espectroscopia Raman e de infravermelho com transformada de Fourier, além de análise térmica simultânea). Apesar de a TEOA auxiliar na dispersão das nanopartículas, ao mesmo tempo interferiu no mecanismo de síntese, levando à obtenção de zircônia dopada com WOx com quantidades de tungstênio que variaram dependendo das condições experimentais empregadas.

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Consolidation of nanoparticle suspensions by centrifugation in non-porous moulds

Cited by 6 publications

References 27 publications

Gelcast Zirconia Ceramics With High Strength and Simultaneously High Translucency for Dental Applications

Gelcast Zirconia Ceramics With High Strength and Simultaneously High Translucency for Dental Applications

Wet‐Route Synthesis and Characterization of Yb:CaF₂ Optical Ceramics

Dispersão e consolidação de zircônia dopada com WOx a partir do tungstato de zircônio e trietanolamina em meio aquoso

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Consolidation of nanoparticle suspensions by centrifugation in non-porous moulds

Cited by 6 publications

References 27 publications

Gelcast Zirconia Ceramics With High Strength and Simultaneously High Translucency for Dental Applications

Gelcast Zirconia Ceramics With High Strength and Simultaneously High Translucency for Dental Applications

Wet‐Route Synthesis and Characterization of Yb:CaF2 Optical Ceramics

Dispersão e consolidação de zircônia dopada com WOx a partir do tungstato de zircônio e trietanolamina em meio aquoso

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Wet‐Route Synthesis and Characterization of Yb:CaF₂ Optical Ceramics