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Application of a rotary kiln for the treatment of carbonaceous materials of the selective waste polymer and biomass type
Kříž, Vlastimil; Bičáková, Olga; Náhunková, Jana
2011 - English
In the rotary kiln, samples of polypropylene and sawdust in model mixtures with bituminous-coal coke at a temperature of 900°C were pyrolyzed. The composition and features of the pyrolytic gas and solid product were observed.
Keywords:
rotary kiln; pyrolysis; biomass
Available at various institutes of the ASCR
Application of a rotary kiln for the treatment of carbonaceous materials of the selective waste polymer and biomass type
In the rotary kiln, samples of polypropylene and sawdust in model mixtures with bituminous-coal coke at a temperature of 900°C were pyrolyzed. The composition and features of the pyrolytic gas and ...
Mechanical properties of geopolymer mortars in relation to their structure and amount of gel-forming components
Steinerová, Michaela
2011 - English
Compressive/flexural strengths, Young’s modulus and frost resistance of metakaolinite geopolymer composites from standard and waste material. Dependences on porous structure controlled by amount of filler and gel-forming precursors, consumed by bonds on the aggregate surface.
Keywords:
metakaolinite; geopolymer composite; mechanical properties
Available at various institutes of the ASCR
Mechanical properties of geopolymer mortars in relation to their structure and amount of gel-forming components
Compressive/flexural strengths, Young’s modulus and frost resistance of metakaolinite geopolymer composites from standard and waste material. Dependences on porous structure controlled by amount of ...
Microporous inorganic polymers based on metakaolinite and their open porosity structure of a size of 10-20 nm in diameter
Steinerová, Michaela
2011 - English
Geopolymer monomodal pore size distribution of 15 nm in diameter can change within 10-120 nm according to Si/Al ratio and water content in the space between clusters of condensed precursor nanoparticles. Results provided by mercury porosimetry, SEM and AFM.
Keywords:
inorganic polymer matrix; Si/Al ratio systems; condensation-reactions
Available at various institutes of the ASCR
Microporous inorganic polymers based on metakaolinite and their open porosity structure of a size of 10-20 nm in diameter
Geopolymer monomodal pore size distribution of 15 nm in diameter can change within 10-120 nm according to Si/Al ratio and water content in the space between clusters of condensed precursor ...
Optimizing and Evaluating the Biocompatibility of Fiber Composites with CaP Additives
Suchý, Tomáš; Sucharda, Zbyněk; Balík, Karel; Sochor, M.; Bačáková, Lucie
2010 - English
Composite materials based on a polyamide fabric (aramid) and a polydymethyl-siloxane (PDMS) matrix were designed for application in bone surgery. In order to increase the bioactivity, 2, 5, 10, 15, 20 and 25 vol. % of nano/micro hydroxyapatite (HA) and tricalcium phosphate (TCP) were added. The effect of the additives on the biocompatibility was studied. It appears that nano additives have a more favorable effect than micro particles on mechanical properties. For final application of the composites as substitutes for bone tissues, 15 vol. % of nano hydroxyapatite additives is an optimum amount: in this case both the mechanical properties and the biological properties are optimized without distinct changes in the inner structure of the composite.
Keywords:
biocomposites; calcium phosphate; polyamide fibers; polydimethylsiloxane
Available at various institutes of the ASCR
Optimizing and Evaluating the Biocompatibility of Fiber Composites with CaP Additives
Composite materials based on a polyamide fabric (aramid) and a polydymethyl-siloxane (PDMS) matrix were designed for application in bone surgery. In order to increase the bioactivity, 2, 5, 10, 15, 20 ...
The use of mixed waste polymers in thermal treatment with brown coal
Kříž, Vlastimil; Bičáková, Olga; Machač, P.
2010 - English
Samples of brown coal from Jiří Mine alone and its mixtures with waste plastics were gasified on a laboratory scale. Using a thermal-degratation module, inserted in the stream of volatile products of pyrolysis and gasification, energetic gas with with higher hydrogen content was obtained.
Keywords:
brown coal; waste polymers; gasification
Available at various institutes of the ASCR
The use of mixed waste polymers in thermal treatment with brown coal
Samples of brown coal from Jiří Mine alone and its mixtures with waste plastics were gasified on a laboratory scale. Using a thermal-degratation module, inserted in the stream of volatile products of ...
Indirect stress measurement by static vertical pendulum
Kalenda, Pavel; Neumann, L.; Wandrol, I.
2009 - English
Static pendulums were used for indirect stress measurement in Bohemian Massif. The anomalous tilt and/or noise were recognised before the biggest earthquakes on the Euroasian lithospheric plate. The Kurile EQ (24.11.2008) was predicted a day advance.
Keywords:
stress; earthquake; pendulum
Available at various institutes of the ASCR
Indirect stress measurement by static vertical pendulum
Static pendulums were used for indirect stress measurement in Bohemian Massif. The anomalous tilt and/or noise were recognised before the biggest earthquakes on the Euroasian lithospheric plate. The ...
Biocompatibility optimization of fabric composites by calcium phosphates
Sochor, M.; Balík, Karel; Suchý, Tomáš; Sucharda, Zbyněk
2009 - English
Composite materials based on a polyamide fabric and a polydimethylsiloxane matrix were designed for application in bone surgery. In order to increase the bioactivity, 2, 5, 10, 15, 20 and 25 vol. % of nano/micro hydroxyapatite and tricalcium phosphate were added. The effect of the additives on the mechanical properties was studied. Simultaneously, changes in the inner structure of the composites were investigated by means of image analysis.
Keywords:
polydimethylsiloxane; aramid; hydroxyapatite
Available at various institutes of the ASCR
Biocompatibility optimization of fabric composites by calcium phosphates
Composite materials based on a polyamide fabric and a polydimethylsiloxane matrix were designed for application in bone surgery. In order to increase the bioactivity, 2, 5, 10, 15, 20 and 25 vol. % of ...
Particulate composites based on nano HA/TCP particles for bone graft replacements
Suchý, Tomáš; Rýglová, Šárka; Balík, Karel; Sucharda, Zbyněk; Denk, F.
2009 - English
Particulate composite materials have been developed for applications in the form of an intervertebral cage (for use in spine treatment). The intervertebral cage is composed of a bearing cage made of PEEK and a composite core with the surface contacting the bone surface and ensuring elastic linkage of two vertebral bodies, resulting in good adhesion to the bone. Mechanical analysis of different kinds of particulate composites was performed. The effect of hydroxyapatite and tri-calcium phosphate nanofiller volume fractions on the mechanical properties of particulate composites was investigated.
Keywords:
hydroxyapatite; tricalcium phosphate; particulate composite
Available at various institutes of the ASCR
Particulate composites based on nano HA/TCP particles for bone graft replacements
Particulate composite materials have been developed for applications in the form of an intervertebral cage (for use in spine treatment). The intervertebral cage is composed of a bearing cage made of ...
Bioinspired nanocomposite structures for bone tissue regeneration with gelatin nanofibres
Šupová, Monika; Hrušková, Daniela; Sucharda, Zbyněk; Svobodová, J.
2009 - English
The aims of this work has been the preparation of bioinspired composite materials composed of gelatin matrix, gelatin nanofibers and hydroxyapaptite powder and verifying the influence of nanofibers on the mechanical properties of the composites. Cílem této práce bylo připravit biologicky inspirovaný kompozitní materiál složený z želatinové matrice, želatinových nanovláken a z nanočástic hydroxyapatitu a ověření vlivu nanovláken na mechanické vlastnosti kompozitu.
Keywords:
composite; gelatin; hydroxyapatite
Available at various institutes of the ASCR
Bioinspired nanocomposite structures for bone tissue regeneration with gelatin nanofibres
The aims of this work has been the preparation of bioinspired composite materials composed of gelatin matrix, gelatin nanofibers and hydroxyapaptite powder and verifying the influence of nanofibers on ...
Composite material based on aramid fibers and polysiloxane matrix modified by ydroxapatite nanoparticles
Sochor, M.; Balík, Karel; Suchý, Tomáš; Sucharda, Zbyněk; Černý, Martin
2008 - English
This study is aimed at verification of influence of hydroxyapatite nanoparticles additives, commonly used to improve the bioactivity of implants, on mechanical properties (namely ultimate strength in bending and modulus of elasticity in bending) of composite material potentially applicable in the bone surgery. Tato studie si klade za cíl ověření vlivu nanočásticového hydroxyaptitu, jako bioaktivní příměsi matrice, na mechanické vlastnosti (jmenovitě pevnost v ohybu a ohybový modul pružnosti) kompozitního materiálu perspektivně použitelného v kostní chirurgii.
Keywords:
composite material; hydroxyapatite; mechanical behavior
Available at various institutes of the ASCR
Composite material based on aramid fibers and polysiloxane matrix modified by ydroxapatite nanoparticles
This study is aimed at verification of influence of hydroxyapatite nanoparticles additives, commonly used to improve the bioactivity of implants, on mechanical properties (namely ultimate strength in ...
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