Hydroxyapatite suspension

Zhang, P. Ryan, J. A. 1998. Formation of pyro-morphite in anglesite-hydroxyapatite suspensions under varying pH conditions. Environmental Science Technology, 32, 3318-3324. 

Fig. 3. Effect of increasing concentrations of phosphate buffer, pH 7.0, on the adsorption of antibody-bound steroid. pH]Testosterone was incubated with antibody without added unlabeled testosterone. Hydroxyapatite suspensions in phosphate buffers of different molarities were added tubes were shaken and centrifuged, and the supernatants were counted. Phosphate buffer strengths recorded are the final concentrations after addition of the hydroxyapatite suspension.

S. Padilla, R. Garda-Canodeguas and M. Vallet-Regr, Hydroxyapatite suspensions as precursors of pieces obtained by gelcasting method. Journal of the European Ceramic Society, 24, 2223-2232(2004). 

J.M. Tian, Y. Zhang, X.M. Guo, L.M. Dong, Preparation and characterization of hydroxyapatite suspensions for solid free form fabrication, Ceram Int., 28, 299-302 (2002). 

Results are different when solutions are used instead of suspensions. Chitosan-hydroxyapatite composites with a homogeneous nanostructure have been prepared by a coprecipitation method by Yamaguchi et al. [170]. 

Synthetic hydroxyapatite prepared by mixing stoichiometric amounts of aqueous solutions of calcium nitrate and ammonium phosphate was used in this study. The pH of the boiling suspension was maintained at about 10 by flowing a mixture of NH and throughout the precipitation process. The precipitate was repeatedly washed until the conductivity of the supernatant liquid was observed to be constant. The washed sample was freeze-dried and analyzed. An elemental analysis of the batch preparation showed the Ca/P molar to be ratio 1.64, with the predominant impurity being 2... 

Synthetic hydroxyapatites were prepared by the method of Hayek and co-workers (7, 8), modified to produce a product of small particle size. The products were isolated by washing the gel slurry with water until free of nitrate ion. The resultant suspensions were then spray-dried with a Minor Type 53 Niro Atomizer (Copenhagen, Denmark). The resultant dry products were in the form of porous, spherical polycrystalline agglomerates of 5 to 8 fi average diameter. The specific surfaces of these products ranged from 104 to 180 meter2/gram. 

Dietz, V. R., Rootare, H.M., and Carpenter, F.G. The surface composition of hydroxyapatite derived from solution behaviour of aqueous suspensions. J. Coll. Sci. 19, 87-101 (1962). Rootare, H.M., Dietz, V.R., and Carpenter, F.G. Solubility product phenomena in hydroxyapatite water systems. J. Coll. Sci. 17, 179-206 (1962). 

Deslandes, Y., Morphology of hydroxyapatite as suspension stabilizer in the polymerization of poly(styrene-co-butadiene), J. Appl. Polym. Sci. 34 (1987) 2249. 

Antibody-bound steroid was adsorbed to hydroxyapatite after addition to the incubation medium as a suspension or a solid powder. Free and antibody-bound steroid can also be separated in small columns of hy-droxyapaptite, eluting antibody-bound steroid with a continuous, increasing concentration of phosphate buffer, pH 7.0 (see Fig. 1). 

Christoffersen M. R., Dohrup J., and Christoffersen J. (1998) Kinetics of growth and dissolution of calcium hydroxyapatite in suspensions with variable calcium to phosphate ratio. J. Cryst. Growth 186, 283-290. 

Cattini, A., Bellucci, D., Sola, A., Pawlowski, L., and Cannillo, V. (2014) Microstructural design of functionally graded coatings composed of suspension plasma sprayed hydroxyapatite and bioactive glass. /. Biomed. Mater. Res. B Appl. Biomater., 102 (3), 551-560. 

Figure 5.32 SEM images of conventional atmospheric plasma sprayed (APS, left) and suspension plasma sprayed (SPS, right) hydroxyapatite coatings, (a, b) Top view and (c, d) coating cross-sections (Gross and Saber-Samandari, 2009). ( With permission by Elsevier.)...

Bouyer, E. (1997) Etude de la Preparation et de Depots a Partir de Suspension par Plasma Inductif — le Cas de l Hydroxyapatite Phosphocalcique. Dissertation. Universite de Sherbrooke, Quebec, Canada. 

D Haese, R., Pawlowski, L., Bigan, M., Jaworski, R., and Martel, M. (2010) Phase evolution of hydroxyapatite coatings suspension plasma sprayed using variable parameters in simulated body fluid. Surf. Coat. Technol., 204 (8), 1236-1246. 

Jaworski, R., Pierlot, C., Tomaszek, R., Pawlowski, L., Znamirowski, Z., and Zdanowski, J. (2007) Optimization of dielectric properties of suspension plasma sprayed hydroxyapatite coatings. Material-wiss. Werkstofftech., 38 (2), 125-130. 

Stiegler, N., Bellucci, D., Bolelli, G., Cannillo, V., Gadow, R., Killinger, A., Lusvarghi, L., and Sola, A. (2012) High-velocity suspension flame sprayed (HVSFS) hydroxyapatite coatings for biomedical applications. / Therm. Spray Technol., 21 (2), 275 — 287. 

High velocity suspension flame sprayed (HVSFS) hydroxyapatite coatings for biomedical applications, in Advanced Ceramic Coatings and Materials for... 

L., Laureyns, J., and Le Maguer, A. (2007) Microstructure of suspension plasma sprayed multilayer coatings of hydroxyapatite and titanium oxide. Surf. Coat. Technol., 201 (16-17), 7432-7440. 

Radio frequency (RF) suspension plasma sprayed ultra-fine hydroxyapatite (HA)/zirconia composite powders. Biomaterials, 24, 2611—2621. 

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