Investigation of nano hydroxyapatite prepared from eggshell and seashell

Gréta Gergely 1Ferenc Wéber 1István E. Lukács 1Katalin Balázsi 1Levente Illés 1Attila L. Tóth 1Judith Mihály 2Csaba Balazsi 1

1. Hungarian Academy of Sciences, Research Institute for Technical Physics and Materials Science, P.O.Box 49, Budapest H-1525, Hungary
2. Hungarian Academy of Sciences, Chemical Research Centre (CRC/HAS), Pusztaszeri ut 59-67, Budapest H-1025, Hungary


Bioceramics fulfil an unique function as biomedical materials. The development of biomaterials and manufacturing techniques has broadened the diversity of applications within the human body. Hydroxyapatite (HAP) is chemically similar to the mineral component of bones and hard tissues in mammals. It is one of few materials that are classed as bioactive, meaning that it will support bone ingrowth and osseointegration when used in orthopaedic, dental and maxillofacial applications. Coatings of hydroxyapatite are often applied to metallic implants (most commonly titanium/titanium alloys and stainless steels) to alter the surface properties. Hydroxyapatite may be employed in forms such as powders, porous blocks and hybrid composites to fill bone defects or voids. These may arise when large sections of bone have had to be removed (e.g. bone cancers) or when bone augmentations are required (e.g maxillofacial reconstructions or dental applications).

In this work, hydroxyapatite were successfully produced by using recycled eggshell, seashell and phosphoric acid. The observed phases on the powder synthesis process were dependent on the mixing ratio (wt.%) of the calcined eggshell and phosphoric acid, and the calcination temperature. Elaboration processes of the HAP has been developed and compared of the HAPs from different raw materials.The structures of the HAP were characterized by X-ray diffraction and scanning electron micropscopy. Samples were pressed from the HAP powder, and the three and four point beinding strengt was determined.


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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium F, by Csaba Balazsi
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-25 19:42
Revised:   2009-06-07 00:48