Covalent Nanoassemblies of Carbon Nanotubes and DNA Oligo-Nucleotides Synthesized
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RESEARCH/RESEARCHERS Titanium Foams Fabricated for Bone-Tissue Engineering Applications Titanium and its alloys are widely used as biological implants because of their superior biocompatibility, corrosion resistance, and lower modulus. However, the elastic moduli of these materials are still high when compared to those of human bone, particularly cancellous (porous) bone. Metallic foams are an option since the porous structure can more closely resemble that of bone. The optimum pore structure for these foams has been determined to be ~200–500 µm for permeation, attachment, and growth of osteoblasts. Producing metallic foams with pore sizes in this range using methods such as investment casting has proven difficult. Now, C.E. Wen and coworkers from the National Institute of Advanced Industrial Science and Technology, Japan, have fabricated titanium foams by using a powder metallurgical process incorporating space-holder particles to form a porous structure. They reported their work in the October issue of the Journal of Materials Research. Pure titanium powder (purity ≥99.9%) was used along with ammonium hydrogen carbonate powder as the space-holder material. The size of the ammonium hydrogen carbonate powder was selected to be 200–500 µm, with the size of the titanium powder selected to be
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