ChemInform Abstract: SOME PHYSICOCHEMICAL ASPECTS OF CHLORAPATITE

Narasaraju, T. S. B.; S., U.; Rao, K. K.

doi:10.1002/chin.197923021

Cited by 3 publications

(6 citation statements)

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“…5, shows that the HA powders were highly agglomerated when dispersed in deionized water with a median diameter (d 50 ) of 23 m and a narrow size distribution. On the contrary, the particles were well-dispersed in the presence of both dispersing agents, A (2%) and B (3%), as shown by the shift in the particle-size distribution curves to finer ranges with minimum values for particle sizes (dispersant A: d 10…”

Section: (3) Particle/floc Size Distribution Of Hamentioning

confidence: 99%

“…Synthetic hydroxyapatite (HA, Ca 10 (PO 4 ) 6 (OH) 2 ), because of its biocompatibility and chemical and biological affinity with bone tissues, has potential applications as a bioceramic material. [7][8][9][10][11][12] Even though synthetic HA ceramics have been studied extensively during the past two decades, very little information is available in the literature 10,12 on the methods of processing such ceramics. In most of the studies, only conventional dry powder compaction, followed by sintering, has been used as a processing route for HA ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Dispersion and Slip Casting of Hydroxyapatite

Rao

Kannan

2001

Journal of the American Ceramic Society

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The dispersibility in deionized water of hydroxyapatite (HA) synthesized by a high-temperature (1000°C) solid-state reaction between tricalcium phosphate and calcium hydroxide was investigated as a function of the pH of the medium and the quantity of two dispersing agents (A ‫؍‬ inorganic, B ‫؍‬ organic) added to the slips. Although pH modification had a negligible effect on dispersibility, both of the dispersing agents produced a good dispersion at considerably higher concentrations (>2 wt% of HA). At optimum amounts (2-4 wt%) of the dispersing agents, the slips showed near-Newtonian flow behavior up to 45 wt% solids loading and non-Newtonian behavior at >50 wt%. By the optimal addition of dispersing agents and conditioning by ball milling, 60 -67 wt% (32-39 vol%) solids-loaded HA slips could be cast into plaster molds to produce 50%-58% dense green bodies, which, in turn, sintered to 90%-94% density in the temperature range 1300°-1400°C. The sintered HA exhibited a three-point flexural strength of 40 -60 MPa and a homogeneous microstructure, with interspersed microporosities.

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Section: (3) Particle/floc Size Distribution Of Hamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dispersion and Slip Casting of Hydroxyapatite

Rao

Kannan

2001

Journal of the American Ceramic Society

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“…HA has been used not only as a bone substitute but also as a coating material to promote cell proliferation because of its protein adhesion capacity 9) . Currently, physical vapor deposition methods, such as sputtering and plasma-spraying, are the main methods used to apply HA coatings; however, with these methods it is difficult to achieve a uniform thin coating on complex threedimensional porous structures.…”

Section: Introductionmentioning

confidence: 99%

Thin Hydroxyapatite Coating on Porous Beta-Tricalcium Phosphate (β-TCP) Enhances Osteoblast Function Activity

Monden

Hirota

Hayakawa

et al. 2012

J. Hard Tissue Biology.

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Abstract:We evaluated the properties of porous beta-tricalcium phosphate (β-TCP) coated with a thin layer of hydroxyapatite (HA) using a molecular precursor method. Samples of HA-coated beta-TCP (HATCP) and non-coated β-TCP (TCP) were used for osteoblast culture. The proliferation and function of osteoblasts cultured in the samples were evaluated. Osteoblast proliferation and mineralization activity and secretion of osteoclast activating factors in the samples were observed. The thin HA coating on porous β-TCP was not affected to the three dimensional structures. The calcium concentration with osteoblast was significantly higher in the HATCP group, suggesting the thin HA coating enhanced mineralization activity of osteoblast. Osteoblast proliferation activity was similar in the TCP and HATCP groups. Then, osteoclast activating factors seen in HATCP were more than those in TCP. These results suggest that a thin HA coating on porous β-TCP enhanced osteoblast function activity without reducing proliferation activity.

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“…[1][2][3][4][5] When HA materials are used as implants, they are slowly replaced by the host bone, forming a direct bond with the neighboring bone structure. Recently, the fabrication of bioceramics with porous configurations has attracted particular attention because a porous network allows tissue infiltration, which in turn enhances implant-tissue attachment.…”

Section: Introductionmentioning

confidence: 99%

“…H YDROXYAPATITE (HA, Ca 10 (PO 4 ) 6 (OH) 2 ) has been regarded as a promising biomaterial due to its high biocompatibility, good bioaffinity and osteoconduction, and its crystallographic and chemical similarity to the human bone. [1][2][3][4][5] When HA materials are used as implants, they are slowly replaced by the host bone, forming a direct bond with the neighboring bone structure. Recently, the fabrication of bioceramics with porous configurations has attracted particular attention because a porous network allows tissue infiltration, which in turn enhances implant-tissue attachment.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Macrochannelled‐Hydroxyapatite Bioceramic by a Coextrusion Process

Koh

Kim

et al. 2002

Journal of the American Ceramic Society

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A coextrusion process was used to fabricate macrochannelled hydroxyapatite (HA). To improve the powder characteristics, the HA powder was calcined at 900°C in air for 1 h. A feedrod composed of HA (shell) and carbon black (core) was coextruded at 120°C through a symmetric 8:1 square reduction die. After the first coextrusion, the individual pieces were bundled, warm-pressed, and then coextruded again. After removing the binder, the billet was sintered at 1350°C for 1h in air. Uniform, 27 vol% macrochannels with a diameter of 270 m were formed in the dense HA through removal of the carbon black. The compressive strength of the test specimens was strongly dependent on the macrochannel direction due to the stress concentrations related to the macrochannel geometry.

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ChemInform Abstract: SOME PHYSICOCHEMICAL ASPECTS OF CHLORAPATITE

Abstract: Reiner Chlorapatit wird durch die Festkörperreaktion Adargestellt und chemisch, röntgenographisch, elektronenmikroskopisch, IR‐spektroskopisch, durch TG und DTA charakterisiert.

Cited by 3 publications

References 0 publications

Dispersion and Slip Casting of Hydroxyapatite

Dispersion and Slip Casting of Hydroxyapatite

Thin Hydroxyapatite Coating on Porous Beta-Tricalcium Phosphate (β-TCP) Enhances Osteoblast Function Activity

Fabrication of Macrochannelled‐Hydroxyapatite Bioceramic by a Coextrusion Process

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