Physical Properties Self-Setting Bone Cement with Particle Size Distribution of Dicalcium Phosphate Dihydrate

2003 ◽  
Vol 240-242 ◽  
pp. 377-382 ◽  
Author(s):  
J.K. Lee ◽  
In Soo Hwang ◽  
Sang Hwan Cho
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Physical Properties ◽  
Bone Cement ◽  
Size Distribution ◽  
Dicalcium Phosphate ◽  
Dicalcium Phosphate Dihydrate ◽  
Phosphate Dihydrate

The influence of particle size distribution on soil physical properties

1986 ◽  
Vol 106 (3) ◽  
pp. 527-535 ◽  
Author(s):  
G. D. Towner
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Physical Properties ◽  
Size Distribution ◽  
Soil Physical Properties ◽  
The Other ◽  
Saturated Soils ◽  
Fine Silt ◽  
Significant Difference ◽  
Field Behaviour

SummaryBatcombe series soils readily break down to good tilths, Beccles series soils form cloddy seed beds that are resistant to weathering, and Stackyard series soils form unstable tilths that readily break down. The soils differ in their particle-size distribution. The proposition that such differences contributed to the differences in field behaviour was examined by forming artificial soils, each of which was made up from particles of one of the soils, but redistributed with respect to size in the proportion in which they occurred in one of the other soils.As a measure of the relevant physical properties, breaking strengths and bulk densities of cylindrical ‘clods’ moulded from the artificial soils were determined. To aid interpretation of the observed soil properties, similar measurements were made on individual fractions, on various other mixtures and on the parent soils.The breaking strengths of the soils made up to a given particle-size distribution from particles from the different parent soils were reasonably close to each other, with those for the Beccles distribution being more variable. There was a significant difference between the two. The strength of the reconstituted Batcombe soil was markedly greater than that of its parent soil, whereas that for Beccles soil was markedly less. There was little difference for the Stackyard soil.The bulk densities of saturated soils reconstituted from all nine fractions could be estimated reasonably accurately from the properties of the separate components. The structure of each of these soils in the air-dry state was inferred from comparisons between measured and calculated bulk densities. The breaking strengths of air-dry reconstituted soils were estimated from the properties of the separate components, and agreed reasonably well with the measured values for soils in which the clay and fine silt fractions predominated.Whereas it was generally possible to predict various physical properties of the reconstituted soils from those of the separate fractions, it was not possible to extrapolate the results to explain field behaviour.

EFFECT OF REVERSE MICELLE WATER POOL IN SYNTHESIS OF ZIRCONIA STABILIZED COPPER NANOCOMPOSITE

2012 ◽  
Vol 05 ◽  
pp. 559-567
Author(s):  
H. Abdizadeh ◽  
Y. Vahidshad ◽  
H. R. Baharvandi ◽  
M. Akbari Baseri
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Physical Properties ◽  
Size Distribution ◽  
Anionic Surfactant ◽  
Reverse Micelle ◽  
Sol Gel ◽  
Molar Ratio ◽  
Water Pool ◽  
20 Nm

In the water-in-oil (W/O) microemulsions based on anionic (AOT) surfactants, the ω value (molar ratio of water to surfactant), precursor, and surfactant could remarkably affect the synthesis of CuO - ZrO 2 nanocomposite and the morphologies of the sol-gel products simultaneously. In this study, CuO - ZrO 2 nanoparticles are synthesized using microreactors made of surfactant/water/n-hexane microemulsions and discusses the effect of different microemulsion variables on the particle size and particle size distribution by water-to-surfactant molar ratio. The obtained powders are characterized by DTA, XRD, SEM, EDS, and TEM and their physical properties are compared. For AOT surfactant the particle size increased with increasing the water to surfactant molar ratio. The particles size of CuO - ZrO 2 nanocomposite in sample with anionic surfactant with molar ratio of 6 that calcined at 600°C is between 15-20 nm.

Analysis on the Setting of Brushite Bone Cement after Storage in the Humid Environment

2016 ◽  
Vol 696 ◽  
pp. 32-35
Author(s):  
Tai Joo Chung ◽  
Kyung Sik Oh
Keyword(s):  
Bone Cement ◽  
Tricalcium Phosphate ◽  
Driving Force ◽  
Activation Barrier ◽  
Setting Time ◽  
Dicalcium Phosphate ◽  
Dicalcium Phosphate Dihydrate ◽  
Major Phase ◽  
Phosphate Dihydrate ◽  
Humid Environment

The cause of the degradation was analyzed by applying the highly humid conditions during the storage of cement composed of β-tricalcium phosphate (β-TCP) and monocalcium phosphate monohydrate (MCPM). For the β-TCP and MCPM stored separately under the humid environment, the mild increase in the setting time was observed, and the product after the setting was entirely dicalcium phosphate dihydrate (CaHPO42H2O: DCPD). However, for the β-TCP and MCPM stored mixed under the same condition, the setting time significantly increased with the period of storage, and the product contained dicalcium phosphate (CaHPO4: DCP) as major phase, resulting in the loss of setting ability. The formation of DCP could be because of the weak driving force for setting, caused by a feeble supply of water from moisture. As the formation of DCPD requires stronger driving force to overcome the activation barrier, sufficient amount of water is essential. Humid environment during the storage decreased the driving force by the formation of DCP, and the driving force to produce DCPD was lost during the actual setting.

Exothermal Behavior during the Hydration of the PCCP+DCPA System Cement

2009 ◽  
Vol 610-613 ◽  
pp. 1255-1258 ◽  
Author(s):  
Xiu Peng Wang ◽  
Jian Dong Ye
Keyword(s):  
Particle Size ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Dicalcium Phosphate ◽  
Hydration Process ◽  
Dicalcium Phosphate Dihydrate ◽  
Tetracalcium Phosphate ◽  
Phosphate Dihydrate ◽  
Close Relationship

Exothermal behavior is always present during the hydration of cements. The biocompatibility and curing effect of a bone cement is in close relationship with its exothermal behavior. The exothermal behavior in the hydration process of the partially crystallized calcium phosphate (PCCP)+dicalcium phosphate anhydrate (DCPA) system cement was studied in this article. The results show that with the decrease of the particle size of DCPA, the heat release rate was greatly increased; whereas, with the decrease of the particle size of PCCP, the heat release rate was not obviously altered. The heat release in the hydration process of the PCCP+DCPA system cement was only 137 J/g, which was quite smaller than that of the tetracalcium phosphate (TTCP)+dicalcium phosphate dihydrate (DPCD) system cement, and the temperature increase was very small for this cement.

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