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| rdf:type
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| Description
| - Porous hydroxyapatite (HA) ceramics with controlled microstructure have been prepared by uniaxial pressing of dry HA powders with a precisely size fraction of sucrose (400-600 ?m) as a pore former and pressing additive. Total porosities obtained after firing (800-1000 °C) powder compacts with 10-50 vol.% of sucrose are in the range 52-72 %, which indicates that a significant part of the porosity is not a result from sucrose burnout, but residual interstitial porosity between the primary nanocrystalline HA grains (crystallites) forming the matrix in which the large pores (mean chord length range determined via stereology-based image analysis approx. 400-800 ?m) are embedded. This has been confirmed by SEM and by mercury porosimetry. As expected, the strength of these materials is not very high (diametral compression strength { 1.2 MPa) and decreases significantly with increasing porosity. However, Young's moduli are in the range 1-11 GPa, i.e. very close to that of bone (2-20 GPa), so that these materials may be considered as elastocompatible with human bone tissue. Moreover, highly porous, cellular HA ceramics have been prepared by foaming ceramic suspensions, using different processes with four different agents for foaming (wheat flour, yeast, sodium hydrogen carbonate, ammonium carbonate). The total porosities obtained for these materials after firing at 1200 °C are in the range 69-81 %, typical for ceramic foams. The pore size determined via stereology-based image analysis is in the range approx. 700-1500 ?m (mean chord lengths). Except for the large pores (ceramic foam cells), these materials contain pores with sizes of order 1-100 ?m and the nanosized interstitial pores between the primary HA grains (crystallites) of the partially sintered HA matrix. Thus these materials exhibit a multilevel hierarchical microstructure.
- Porous hydroxyapatite (HA) ceramics with controlled microstructure have been prepared by uniaxial pressing of dry HA powders with a precisely size fraction of sucrose (400-600 ?m) as a pore former and pressing additive. Total porosities obtained after firing (800-1000 °C) powder compacts with 10-50 vol.% of sucrose are in the range 52-72 %, which indicates that a significant part of the porosity is not a result from sucrose burnout, but residual interstitial porosity between the primary nanocrystalline HA grains (crystallites) forming the matrix in which the large pores (mean chord length range determined via stereology-based image analysis approx. 400-800 ?m) are embedded. This has been confirmed by SEM and by mercury porosimetry. As expected, the strength of these materials is not very high (diametral compression strength { 1.2 MPa) and decreases significantly with increasing porosity. However, Young's moduli are in the range 1-11 GPa, i.e. very close to that of bone (2-20 GPa), so that these materials may be considered as elastocompatible with human bone tissue. Moreover, highly porous, cellular HA ceramics have been prepared by foaming ceramic suspensions, using different processes with four different agents for foaming (wheat flour, yeast, sodium hydrogen carbonate, ammonium carbonate). The total porosities obtained for these materials after firing at 1200 °C are in the range 69-81 %, typical for ceramic foams. The pore size determined via stereology-based image analysis is in the range approx. 700-1500 ?m (mean chord lengths). Except for the large pores (ceramic foam cells), these materials contain pores with sizes of order 1-100 ?m and the nanosized interstitial pores between the primary HA grains (crystallites) of the partially sintered HA matrix. Thus these materials exhibit a multilevel hierarchical microstructure. (en)
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| Title
| - Porous hydroxyapatite ceramics prepared by dry powder pressing with sucrose and by suspension foaming techniques using wheat flour and other pore formers
- Porous hydroxyapatite ceramics prepared by dry powder pressing with sucrose and by suspension foaming techniques using wheat flour and other pore formers (en)
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| skos:prefLabel
| - Porous hydroxyapatite ceramics prepared by dry powder pressing with sucrose and by suspension foaming techniques using wheat flour and other pore formers
- Porous hydroxyapatite ceramics prepared by dry powder pressing with sucrose and by suspension foaming techniques using wheat flour and other pore formers (en)
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| skos:notation
| - RIV/60461373:22310/14:43898212!RIV15-GA0-22310___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/60461373:22310/14:43898212
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - image analysis; stereology; pore size; mean chord length; Young's moduli; human bone; diametral compression strength; pores; pressing additive; pore former; uniaxial pressing; sucrose; bone tissue engineering scaffolds; porosity; Hydroxyapatite (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...v/mistoKonaniAkce
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| http://linked.open...i/riv/mistoVydani
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| http://linked.open...i/riv/nazevZdroje
| - Proceedings of the 10th International Conference on Polysaccharides - Glycoscience
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...iv/tvurceVysledku
| - Gregorová, Eva
- Pabst, Willi
- Veselý, Martin
- Sedlářová, Ivona
- Uhlířová, Tereza
- Hoskovcová, Tereza
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| http://linked.open...vavai/riv/typAkce
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| http://linked.open.../riv/zahajeniAkce
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| number of pages
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| http://purl.org/ne...btex#hasPublisher
| - Česká chemická společnost
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| https://schema.org/isbn
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| http://localhost/t...ganizacniJednotka
| |
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