Preparation and Characterization of Porous Hydroxyapatite Block Using a HHP Method

2006 ◽  
Vol 309-311 ◽  
pp. 1067-1070
Author(s):  
Hee Song ◽  
Soo Ryong Kim ◽  
Hae Jung Kim ◽  
Jong Hee Hwang ◽  
Woo Teck Kwon ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Calcium Carbonate ◽  
Cancellous Bone ◽  
Hot Pressing ◽  
Starting Material ◽  
Pressing Method ◽  
Porous Hydroxyapatite ◽  
Human Cancellous Bone ◽  
Natural Coral

Porous hydroxyapatite has been prepared using a hydrothermal hot pressing method from calcium carbonate as a starting material. SEM result shows porous hydroxyapatite block is formed of three dimensionally inter-connected pores of 100-400µm in size, similar to human cancellous bone. At the ~ 70% porosity, the compressive strength was about 4MPa, which is similar to that of the commercially available porous hydroxyapatite derived from natural coral.

Effect of Slurry Preparation on Physical Properties of Porous Hydroxyapatite Prepared via Polymeric Sponge Method

2008 ◽  
Vol 47-50 ◽  
pp. 932-935 ◽  
Author(s):  
Iis Sopyan ◽  
J. Kaur ◽  
A.R. Toibah ◽  
Mohd Hamdi Bin Abdul Shukor ◽  
Ramesh Singh
Keyword(s):  
Compressive Strength ◽  
Cancellous Bone ◽  
Sintering Process ◽  
Porous Hydroxyapatite ◽  
Porous Bodies ◽  
Hydroxyapatite Powder ◽  
Dispersing Agent ◽  
Human Cancellous Bone ◽  
Stirring Time ◽  
Slurry Preparation

Hydroxyapatite porous materials for cancellous bone applications were prepared via polymeric sponge method. Suspensions of the nanostructured hydroxyapatite powders were prepared via stirring of the mixture of hydroxyapatite powder, water, and dispersing agent. The stirring time was adjusted at 4 and 20 hours. After soaking cellulosic sponges into the suspension, the sponges were dried and then subjected to heat-treatment at 600°C, followed by sintering at 1250°C for 1 h. No additional phases were identified in the sintered porous hydroxyapatite. This result showed that the sintering process did not alter the hydroxyapatite phase composition. The study found that the apparent density of the porous bodies varied from 1.69 g/cm3 to 2.03 g/cm3 with 35.6 – 46.2 % porosities and 100-500 microns macropore size depending on the composition of slurry and the stirring time. Longer stirring time resulted in the breakdown of HA agglomerates and the slurry obtained tends to be more homogeneous, leading to higher density and better compressive strength of the sintered porous bodies. The measurement of compressive strength provided the values of 4.3 MPa and 10 MPa for 4 h and 20 h stirring time, which is in the range of mechanical strength of human cancellous bone.

Synthesis and Characterisation of Slag Based Geopolymers

2010 ◽  
Vol 636-637 ◽  
pp. 155-160 ◽  
Author(s):  
C. Panagiotopoulou ◽  
Glykeria Kakali ◽  
Sotiris Tsivilis ◽  
T. Perraki ◽  
Maria Perraki
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Starting Material ◽  
Alkaline Media ◽  
High Compressive Strength ◽  
Geopolymer Matrix ◽  
Furnace Slag ◽  
Alkali Ion

In the present work the geopolymerisation of blast furnace slag (GGBS) under varying conditions is being investigated. The experimental comprises the following parts: i) dissolution of slag in alkaline media and the investigation of the effect of the alkali ion (K or Na) on the dissolution of Al+3 and Si4+, ii) synthesis of slag based geopolymers and the investigation of the effect of the Si/Al ratio and the kind of alkaline ion on the development of the compressive strength and iii) characterization of geopolymers by means of XRD, FTIR and SEM/EDS measurements. As it is concluded, blast furnace slag geopolymers exhibit high compressive strength, with the maximum being 112.7±2 MPa. The Si/Al ratio of the starting material is found to affect strongly the development of the geopolymer compressive strength. The microstructure of slag–based geopolymers and the incorporation of Ca in the geopolymer matrix are also discussed.

scholarly journals Syntheses and Characterization of Bulky Mesoporous Silica MCM-41 by Hydrothermal Hot-Pressing Method

2006 ◽  
Vol 47 (8) ◽  
pp. 2103-2105 ◽  
Author(s):  
Hidezumi Nagata ◽  
Mari Takimura ◽  
Yuki Yamasaki ◽  
Atsushi Nakahira
Keyword(s):  
Mesoporous Silica ◽  
Hot Pressing ◽  
Pressing Method ◽  
Mcm 41

Production of Single-Phase Hydroxyapatite Porous Bodies from Gypsum/Polystyrene

2016 ◽  
Vol 881 ◽  
pp. 187-192
Author(s):  
Amanda A. Barbosa ◽  
Andrea V. Ferraz ◽  
Geciane A. Santos ◽  
Nelson C. Olivier ◽  
Alan Christie Silva Dantas
Keyword(s):  
Compressive Strength ◽  
High Purity ◽  
Pore Formation ◽  
Single Phase ◽  
Low Cost ◽  
Starting Material ◽  
Porous Hydroxyapatite ◽  
Second Stage ◽  
Porous Bodies ◽  
Purity Material

Porous bodies were produced using hydroxyapatite as a starting material, gypsum, high purity material, low cost and that can be molded into the desired shape. Also, beads of polystyrene polymer. The first step of this work was to produce porous gypsum blocks obtained by mixing gypsum, water and polystyrene. After drying, they were submerged in acetone solvent for solubilizing the polymer and pore formation. The porous hydroxyapatite was synthesized in a second stage, where the porous gypsum blocks were immersed in a solution of (NH4)2HPO4 0.5 mol L-1 to 100 ° C and pH 7.0-9.0 for 24 hours. From this method, it was possible to produce bodies single phase hydroxyapatite with a maximum porosity of 70 ± 3% and a compressive strength of 1.48 ± 0.17 MPa.

High Compressive Strength of Palm Oil Empty Fruit Bunches (Elaeis guineensis) Composites

2014 ◽  
Vol 896 ◽  
pp. 557-561 ◽  
Author(s):  
Ida Sriyanti ◽  
Lina Agustina ◽  
Iftita Selviana ◽  
Leni Marlina
Keyword(s):  
Compressive Strength ◽  
Silica Nanoparticles ◽  
Hot Pressing ◽  
Elaeis Guineensis ◽  
Pressing Pressure ◽  
Mass Ratio ◽  
Pressing Temperature ◽  
Pressing Method ◽  
Empty Fruit Bunches ◽  
Pressing Time

Simple mixing and hot pressing methods were used to make high strength and light-weight composite from oil palm empty fruit bunches (OPEFB) using PVAc as an adhesive and silica nanoparticles as a filler. The mechanical strength of the composite was examined in term of compressive strength. The simple mixing method was used to mix composition with PVAc and silica nanoparticles. Silica nanoparticles were added as filler. Hot pressing method was used to press the mixed composites at a pressing pressure of 85 MPa, pressing temperature of 150 °C, and pressing time of 20 minutes. The optimum composition in term of compressive strength for the strongest composite had a mass ratio of OPEFB/PVAc of 13 : 2 and obtained a compressive strength of 82,88 MPa. Higher compressive strength of 100,39 MPa was obtained by adding the silica nanoparticles at a mass ratio of OPEFB/PVAc/silica nanoparticles of 13 : 2 : 0,75. At pressing pressure of 100 MPa, pressing temperature of 150 °C, and pressing time of 20 minutes, we found compressive strength of 115,35 MPa. Data analysis of XRD showed that the used silica nanoparticles were in amorphous phase or had broad pattern. The compressive strength data showed that the composites were stronger than the composites made by Masturi and Kumagizuri, and also stronger than the ordinary wood-based composites. Thus, the composites are feasible to be used to replace wood-based composites, especially in furnishings.

The Effect of Synthesis Parameters on the Structure and Properties of Metakaolin Based Geopolymers

2010 ◽  
Vol 636-637 ◽  
pp. 149-154 ◽  
Author(s):  
A. Tsitouras ◽  
T. Perraki ◽  
Maria Perraki ◽  
Sotiris Tsivilis ◽  
Glykeria Kakali
Keyword(s):  
Compressive Strength ◽  
Alkali Metal ◽  
Amorphous Materials ◽  
Starting Material ◽  
Structure And Properties ◽  
Experimental Part ◽  
Synthesis Parameters ◽  
Alkali Ion

In the present work the geopolymerisation of metakaolin under varying conditions is investigated.The experimental part comprises the following parts: i) the synthesis of metakaolin based geopolymers and the investigation of the effect of the Si/Al ratio and the kind of alkali ion on the development of the compressive strength and ii) the characterization of the geopolymers by means of XRD, FTIR and SEM. As it is found the development of the compressive strength is strongly affected by the Si/Al ratio in the starting material and the kind of alkali metal, with the maximum being 70.1 MPa for a Si/Al ratio equal to 2.00. The Na- geopolymers show higher compressive strength compared to the NaK-geopolymers. Finally, low Si/Al ratios favour the formation of crystalline compounds (mainly zeolites), while Si/Al ratios higher than 1.5 lead to the formation of amorphous materials.

Ultrasonic characterization of human cancellous bone using the Biot theory: Inverse problem

2006 ◽  
Vol 120 (4) ◽  
pp. 1816-1824 ◽  
Author(s):  
N. Sebaa ◽  
Z. E. A. Fellah ◽  
M. Fellah ◽  
E. Ogam ◽  
A. Wirgin ◽  
...  
Keyword(s):  
Inverse Problem ◽  
Cancellous Bone ◽  
Biot Theory ◽  
Ultrasonic Characterization ◽  
Human Cancellous Bone

scholarly journals Evaluation of Structural and Mechanical Properties of Porous Artificial Bone Scaffolds Fabricated via Advanced TBA-Based Freeze-Gel Casting Technique

2019 ◽  
Vol 9 (9) ◽  
pp. 1965 ◽  
Author(s):  
Tae-Rim Kim ◽  
Min-Su Kim ◽  
Tae Sik Goh ◽  
Jung Sub Lee ◽  
Yun Hak Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Cancellous Bone ◽  
Casting Process ◽  
High Porosity ◽  
Artificial Bone ◽  
Porous Hydroxyapatite ◽  
Casting Technique ◽  
Bone Scaffolds ◽  
Gel Casting

Porous hydroxyapatite (HA) artificial bone scaffolds were prepared via the freeze-gel casting process in order to improve their mechanical strengths. As a porogen, various volumes of poly (methyl methacrylate) (PMMA) powders were added to obtain high porosity, such as in cancellous bone. After fabrication, the porous and mechanical properties of the scaffolds were examined. The HA60 scaffold, with a porosity over 80%, had proper compressive strength and modulus and satisfied the range of properties of cancellous bone. Moreover, it was found that the investigated mechanical properties were affected by the scaffolds’ porosity. However, a section was found where the compressive strength was high despite the increase in the porosity. Specifically, HA30 had a porosity of 62.9% and a compressive strength of 1.73 MPa, whereas the values for HA60 were 81.9% and 3.23 MPa, respectively. The results indicate that there are factors that can preserve the mechanical properties even if the porosity of the scaffold increases. Therefore, in this study, various parameters affecting the porous and mechanical properties of the scaffolds during the manufacturing process were analyzed. It is expected that the improvement in the mechanical properties of the artificial bone scaffold having a high porosity can be applied to tissue engineering.

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