Fabrication of calcium phosphate bioceramics by using eggshell and phosphoric acid

2003 ◽  
Vol 57 (29) ◽  
pp. 4570-4574 ◽  
Author(s):  
S.J. Lee ◽  
S.H. Oh
Keyword(s):  
Calcium Phosphate ◽  
Phosphoric Acid

XIX.—On the Composition of Milk as affected by Increase of the Amount of Calcium Phosphate in the Rations of Cows

1915 ◽  
Vol 35 ◽  
pp. 195-202 ◽  
Author(s):  
A. Lauder ◽  
T. W. Fagan
Keyword(s):  
Calcium Phosphate ◽  
Phosphoric Acid ◽  
General Result ◽  
Food Supply ◽  
General Consensus ◽  
The Subject ◽  
Mineral Constituents

The various factors which are supposed to influence the composition of milk have already been the subject of numerous investigations. The general result of these has been to show that within very wide limits the composition of milk is very little affected by the nature of the food supplied. As regards the mineral constituents the results of some of the investigations are rather conflicting, and while there is a general consensus of opinion that the composition and amount of the mineral constituents are independent of the food-supply, certain investigators claim to have been able to increase both the calcium and phosphoric acid in the milk by slight amounts.

scholarly journals A STUDY FOR SYNTHESIS OF DICALCIUM PHOSPHATE FROM VARIOUS GRADES OF PHOSPHATIC MATERIALS

2018 ◽  
Vol 54 (5A) ◽  
pp. 1
Author(s):  
Bui Quoc Huy
Keyword(s):  
Calcium Phosphate ◽  
Phosphoric Acid ◽  
The Body ◽  
Dicalcium Phosphate ◽  
Type Ii ◽  
High Solubility ◽  
P2o5 Content ◽  
Volumetric Titration ◽  
Crop Types ◽  
Soluble Fertilizer

Anhydrous dicalcium phosphate with monetite structure plays a significant biological importance for the mineralization of bones and teeth. This compound can reconstruct the hard tissues due to its high solubility in the body than other calcium phosphate compounds. Di calcium phosphate is being used as a food - additive supplying calcium and phosphate for humans and animals. Due to the high effective P2O5 content, this compound is also used efficiently as a slowly soluble fertilizer in agriculture for all soil and crop types. This paper presents results of synthesis of di calcium phosphate monetite from Ca(OH)2 and phosphoric acid and di calcium phosphate brushite  from the resulting solution after enriching of type II - Lao Cai apatite ore by phosphoric acid. The samples were examined by volumetric titration methods, XRD, SEM and EDS.

Highly Enantioselective Electrophilic α-Bromination of Enecarbamates: Chiral Phosphoric Acid and Calcium Phosphate Salt Catalysts

2012 ◽  
Vol 134 (25) ◽  
pp. 10389-10392 ◽  
Author(s):  
Aurélien Alix ◽  
Claudia Lalli ◽  
Pascal Retailleau ◽  
Géraldine Masson
Keyword(s):  
Calcium Phosphate ◽  
Phosphoric Acid ◽  
Chiral Phosphoric Acid

In-Situ Cold Temperature XRD of Calcium Phosphate Produced From Organic Phosphoric Acid

2010 ◽  
Author(s):  
M. S. Meor Yusoff ◽  
Wilfred Paulus ◽  
Masliana Muslimin ◽  
Abdul Aziz Bin Mohamed
Keyword(s):  
Calcium Phosphate ◽  
Phosphoric Acid ◽  
Cold Temperature

Synthesis of calcium phosphate crystals in a silica hydrogel containing phosphate ions

2009 ◽  
Vol 24 (6) ◽  
pp. 2154-2160 ◽  
Author(s):  
Taishi Yokoi ◽  
Masakazu Kawashita ◽  
Giichiro Kawachi ◽  
Koichi Kikuta ◽  
Chikara Ohtsuki
Keyword(s):  
Calcium Phosphate ◽  
Phosphoric Acid ◽  
Reaction Temperature ◽  
Crystal Morphology ◽  
Octacalcium Phosphate ◽  
Rate Determining Step ◽  
Phosphate Ions ◽  
Silica Hydrogels ◽  
Crystal Growth Mechanism ◽  
Different Types

Calcium phosphate crystals were synthesized by diffusing calcium ions into silica hydrogels containing phosphate ions. Hydroxyapatite [HAp, Ca10(PO4)6(OH)2] and octacalcium phosphate [OCP, Ca8(HPO4)2(PO4)4.5H2O] with different types of crystal morphology were formed in the gel. The HAp had an irregular or rod shape, a few micrometers in length, while the OCP had an irregular, spherulite, rod- or ribbonlike shape, ranging in size from a few micrometers to several tens of micrometers, depending on the amount of phosphoric acid added and the reaction temperature. The morphology of the OCP changed from an irregular shape to a ribbonlike or rod shape, via a spherulite shape, depending on the amount of phosphoric acid added and the reaction temperature. The degree of supersaturation of the reaction environment and the rate-determining step in the HAp and OCP crystal growth mechanism have been ascribed to the changes in crystal morphology of the HAp and OCP.

Effect of Calcium Titanate and/or Titanium-Phosphides in the Properties of Titanium Composites for Implant Materials

2014 ◽  
Vol 906 ◽  
pp. 226-231
Author(s):  
Enori Gemelli ◽  
Patrícia Borges da Silva Maia ◽  
Fabio Nery ◽  
Nelson Heriberto Almeida Camargo ◽  
Vinícius André Rodrigues Henriques ◽  
...  
Keyword(s):  
Contact Angle ◽  
Compressive Strength ◽  
Calcium Phosphate ◽  
Phosphoric Acid ◽  
Conventional Method ◽  
Pure Titanium ◽  
Calcium Titanate ◽  
Molar Concentration ◽  
Implant Materials ◽  
Lower Contact

Titanium-based composites containing TixPy phase (s) or CaTiO3 and TixPy phase (s) were produced by a non conventional method using suitable mixtures of TiH2 powder and phosphoric acid (TiH2/P), or TiH2 and 10 vol.% of calcium phosphate (TiH2/CP), respectively. The composites were produced with the same phosphor molar concentration. The mixtures were prepared by ultrasound in water, dried in a rotary evaporator, pressed at 600 MPa and vacuum-sintered at 1200 °C for 2 hours. The mixtures were well dispersed by ultrasound and agglomerate-free. The analyses show that titanium particles were coated with TixPy phase (s) for the TiH2/P composite or with an intermediary layer of TixPy phase (s) and an external deposit of calcium titanate for the TiH2/CP composite. The TiH2/P composite presented higher compressive strength and about the same contact angle compared to the TiH2/CP composite. However, both materials displayed lower contact angle than that of pure titanium.

Development and Characterization of β- Tricalcium Phosphate Cements Containing Chitosan

2006 ◽  
Vol 309-311 ◽  
pp. 845-848 ◽  
Author(s):  
Marina S. Tonoli ◽  
Claudinete V. Leal ◽  
Cecília A.C. Zavaglia ◽  
Marisa Masumi Beppu
Keyword(s):  
Acetic Acid ◽  
Calcium Phosphate ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Acetic Acid Solution ◽  
Chitosan Solution ◽  
Phosphoric Acid Solution ◽  
Mechanical Resistance ◽  
Total Acid

Cements were prepared by mixing the calcium phosphate (β-TCP) with phosphoric acid solution (2.6M) and chitosan solution (2.5% in acetic acid solution) that was added in different proportions, ranging from 1 to 50% of total acid solution amount. Observations using SEM showed that the used of chitosan increased the interconnectivity of grains in the final cement, although the mechanical resistance to compression decreased from approximately 3 to 1 MPa. Probably the chitosan macromolecule is able to form a more interconnected net.

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