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  • Electronic Resource  (17)
  • 2005-2009  (17)
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  • Electronic Resource  (17)
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  • 11
    Electronic Resource
    Electronic Resource
    Physicochemical and Mechanical Properties of Composite of Chitosan Microspheres/Calcium Phosphate Cement (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1654-1657 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The aim of this work is to improve the mechanical properties of calcium phosphate bonecement (CPC) by appending chitosan microspheres to CPC base. That chitosan degrades rapidly thanbone cement has been proved by previous investigations. Porous CPC has low compressive strengthbecause of the pores in it weakening the structure. Additive chitosan microspheres can improve themechanical properties by bearing the compress with the CPC base and produce pores after degradation.This study investigates the effect of chitosan microspheres on the setting time, mechanical properties,phase evolution and morphology of CPC. The additive proportion of chitosan microspheres ranges from 0wt% to 30 wt%. Compared with original CPC, the modified CPC has higher compressive strength,without significantly affecting the chemical properties. The phase composition of the CPC is tested byXRD. The microstructures of CPC are observed using SEM. The final setting times range from 5~15minutes and can be modulated by using different liquid and powder (L/P) ratio
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1654.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Study on the Oxidation Behavior of Ca-α-SiAlON in an Air Stream (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 1283-1286 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The oxidation behavior of Ca-α-Sialon composites prepared by using the powders ofα-Si3N4, AlN, Al2O3 and CaCO3 as the starting materials has been studied, for the composition Ca0.8Si8.8Al3.2O16N14.4 in the temperature range of 1200 to 1400°C for 24 to 96h in an air stream. The bending strength and weight gain of the samples before and after oxidation experiment were measured, and the phases of surfaces of the samples were examined by XRD, the microstructures of sections and surfaces of the samples were observed by SEM. The results show that the weight gain increased and the bending strength decreased as the oxidation time increased, and the oxidation layers contained bar cristobalite and glass phase at 1200°C, bubbles and glass phase at 1300°C, transparent glassy film and the pores at 1400°C, the phases of oxidation layers consisted of cristobalite, CaAl2Si2O8, and glass phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.1283.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Preparation of Bioactive β-Tricalcium Phosphate Scaffold with Bone-Like Structure (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1673-1675 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Porous β-TCP scaffold was prepared using three-dimensional gel-lamination technology withfoamy slurry. Then the sintered scaffolds were soaked in 1.5SBF solution to achieve scaffolds withbone-like structure. After soaking, a low crystallized bone-like apatite layer containing CO3-2 was formedon the surface of the scaffold. With presoaking in NaOH solution, the formation of the bone-like apatitelayer on the surface of the scaffold in 1.5SBF solution was accelerated. In this way, a bioactive porousβ-TCP scaffold with bone-like structure could be prepared
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1673.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of Biodegradable β-TCP-Based Composite Microspheres as Bone Tissue Engineering Scaffolds (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1646-1649 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Since a small globular particle was first used as support for three-dimensional (3D) growth ofanchorage-dependent cells in suspended cultures, a variety of microspheres as tissue engineeringscaffolds have been developed. In this paper, β-TCP and chitosan were selected as the components ofmicrospheres due to their biodegradability and osteogenic properties. The biodegradable β-TCP/chitosancomposite microspheres were prepared by a solid-in-water-in-oil (s/w/o) emulsion cross-linking methodin this paper. The size distribution, surface morphology, and microstructure of the microspheres wereevaluated. Scanning electron microscopy revealed that the size of the microspheres with good sphericalmorphology was distributed in the range of 50~200μm. In vitro immersion experiments were carried outto evaluate the degradability of the microspheres, and the results demonstrated that the chitosan/β-TCPcomposite microspheres were potential materials as tissue engineering scaffolds for bone repair
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1646.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Microstructure and Crystallization Behavior of Glasses in the ZrO〈sub〉2〈/sub〉-ZnO-Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉-SiO〈sub〉2〈/sub〉 System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1590-1592 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Crystallization behavior of ZrO2-ZnO-Al2O3-SiO2 glass has been studied by differentialthermal analysis, X-ray diffraction analysis and scanning electronic microscope. ZrO2 doped in the glassinduces the phase separation effectively. The crystal phases obtained are gahnite (ZnAl2O4) and a smallamount of ZrO2 phase. SEM photographs show that the crystal phases distribute uniformly in the glassceramics and the grain sizes of glass ceramics after different heat treatment are less than 60nm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1590.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    In Vivo Behavior of Injectable Fast-Setting Calcium Phosphate Cement (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1625-1627 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The in vivo study was performed to evaluate the biocompatibility and osteogenous ability ofinjectable fast-setting calcium phosphate cement (CPC). Eighteen four-week-old New Zealand whiterabbits were divided into six groups randomly, three in each group. According to the principle of selfcontrastat the same time, cavities of 5mm in diameter and 6mm in depth were drilled in femoral condyleof rabbits. The materials were implanted into cavities of the left leg, the right leg as the blank controlgroup. Rabbits were sacrificed at 2, 4, 8, 12, 16 and 24 weeks after surgery. The microstructure ofspecimens was observed using ESEM. The results showed that injectable fast-setting CPC had goodfluidity and plasticity; it could be injected into bone defects and fast-set in situ. The start setting time was5-8 min and the compressive strength was 25-30 MPa. The CPC had good biocompatibility andosteoconductivity, and benefited to the repair of bone defects
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1625.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    MicroCT Aided Scaffold Design and Preparation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1584-1586 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bone repair method has run to a new stage of bone tissue engineering. Doctors use bonescaffold to fill bone trauma and expect human regeneration ability to reconstruct bone trauma while boneis degrading. Scaffold is essential to bone tissue engineering. Scaffold should introduce new bone withscaffold’s conduction channel. But it’s still very difficult for scaffold to mimic fine structure of bone.Ideal scaffold should have similar component and microstructure to natural bone, which makes it morebiocompatible and better to reconstructed bone. So we forward microCT aided design and preparation tosolve this problem. MicroCT outputs both shape and three-dimensional internal density information.Then, we build computer model of scaffold with acquired microstructure. We fabricate scaffold thatmimics natural bone by 3D rapid prototype machine
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1584.pdf
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