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| rdf:type
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| Description
| - Alumina-containing alginate hydrogels with parallel arrays of highly anisometric capillary pores are prepared by ionotropic gelation of alumina-containing sodium alginate sols with calcium chloride solutions. By osmotic dewatering in polyethylene glycol solutions and subsequent drying, xerogels are obtained, which are studied by microscopy, image analysis and mercury porosimetry. It has been shown that defect-free drying was possible via osmostic dewatering in polyethylene glycol solutions (PEG with molecular mass 8000 g/mol) and subsequent drying under ambient conditions at room temperature and stepwisely increased higher temperatures (40, 60, 80 and 105 °C). Using microscopic image analysis it has been found that in the hydrogels the pore size is significantly larger on the bottom part (201 +- 57 ?m) than on the top part (106 +- 24 ?m) of samples (slices), evidently due to a syneresis-like phenomenon that affects the top parts more because these are formed at an earlier stage of ionotropic gelation. Concerning kinetics it has been confirmed that osmotic dewatering is an efficient technique to speed up the dewatering and drying steps, so that complete drying is possible in approximately half the time when osmotic dewatering is used (characteristic drying times approx. 15 h compared to 33 h without osmotic dewatering). Moreover, shrinkage is much lower in this case than for samples dried without previous osmotic dewatering. During dewatering and drying the pore channels become less conical (i.e. more cylindrical), and after complete drying the alumina-based xerogels have a pore channel diameter of approx. 153 +- 46 ?m, which is a useful size for many applications, including microbial water filters and bone tissue enginneering scaffolds for bone cell ingrowth. The porosity of these xerogels due to the pore channels is approx. 41 %, while the total porosity is approx. 48 %. The difference (approx. 7 %) corresponds to small pores in the walls of the pore channels.
- Alumina-containing alginate hydrogels with parallel arrays of highly anisometric capillary pores are prepared by ionotropic gelation of alumina-containing sodium alginate sols with calcium chloride solutions. By osmotic dewatering in polyethylene glycol solutions and subsequent drying, xerogels are obtained, which are studied by microscopy, image analysis and mercury porosimetry. It has been shown that defect-free drying was possible via osmostic dewatering in polyethylene glycol solutions (PEG with molecular mass 8000 g/mol) and subsequent drying under ambient conditions at room temperature and stepwisely increased higher temperatures (40, 60, 80 and 105 °C). Using microscopic image analysis it has been found that in the hydrogels the pore size is significantly larger on the bottom part (201 +- 57 ?m) than on the top part (106 +- 24 ?m) of samples (slices), evidently due to a syneresis-like phenomenon that affects the top parts more because these are formed at an earlier stage of ionotropic gelation. Concerning kinetics it has been confirmed that osmotic dewatering is an efficient technique to speed up the dewatering and drying steps, so that complete drying is possible in approximately half the time when osmotic dewatering is used (characteristic drying times approx. 15 h compared to 33 h without osmotic dewatering). Moreover, shrinkage is much lower in this case than for samples dried without previous osmotic dewatering. During dewatering and drying the pore channels become less conical (i.e. more cylindrical), and after complete drying the alumina-based xerogels have a pore channel diameter of approx. 153 +- 46 ?m, which is a useful size for many applications, including microbial water filters and bone tissue enginneering scaffolds for bone cell ingrowth. The porosity of these xerogels due to the pore channels is approx. 41 %, while the total porosity is approx. 48 %. The difference (approx. 7 %) corresponds to small pores in the walls of the pore channels. (en)
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| Title
| - Formation of alumina-containing alginate hydrogels via ionotropic gelation, dewatering kinetics and xerogel microstructure
- Formation of alumina-containing alginate hydrogels via ionotropic gelation, dewatering kinetics and xerogel microstructure (en)
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| skos:prefLabel
| - Formation of alumina-containing alginate hydrogels via ionotropic gelation, dewatering kinetics and xerogel microstructure
- Formation of alumina-containing alginate hydrogels via ionotropic gelation, dewatering kinetics and xerogel microstructure (en)
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| skos:notation
| - RIV/60461373:22310/14:43898211!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/60461373:22310/14:43898211
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - pore channels; anisotropic microstructure; pore size; alumina-containing alginate sols; osmotic dewatering; Ionotropic gelation (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
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
| |
| http://linked.open...iv/tvurceVysledku
| - Gregorová, Eva
- Pabst, Willi
- Veselý, Martin
- Sedlářová, Ivona
- Uhlířová, Tereza
- Johanovská, Michaela
- Smolíková, Tereza
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| http://linked.open...vavai/riv/typAkce
| |
| http://linked.open.../riv/zahajeniAkce
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| number of pages
| |
| 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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