polyamide-66(pa66)/caco3 micro- and nano-composites were prepared using a polymer solution method at filler loading of 0, 1, 2 and 3 weight percent. nano-size of caco3 was synthesized by micro-emulsion technique. the material was characterized by xrd, sem, ftir and uv-vis techniques. xrd results of composites suggested that caco3 particles are found in the amorphous phase of the semi-crystallin...

Biominerals such as seashells, corals skeletons, bone, and enamel are optically anisotropic crystalline materials with unique nano- micro-scale organization that translates into exceptional macroscopic mechanical properties, providing inspiration for engineering new superior biomimetic structures. Here we use particles of Seriatopora aculeata coral skeleton a model demonstrate, the first time, ...

In situ Raman scattering and electrical conductivity experiments have been performed to investigate the structural phase transitions of calcite during compressed decompressed processes in a diamond anvil cell at temperatures 298–873 K pressures up 19.7 GPa. Upon compression, (CaCO3-I phase) underwent three from CaCO3-I CaCO3-II phases 1.6 GPa, CaCO3-III 2.2 CaCO3-VI 16.8 GPa under room temperat...

Of a range of glycosaminoglycans, heparin and heparan sulphate were the most effective inhibitors in vitro of CaCO3 (calcite) crystallization as assayed by conductimetric measurements. The possible role of such glycosaminoglycans in modulating calcium-salt crystallizations in vivo is discussed.

On this paper, methods to obtain Mg-free reagents for synthesizing pure phase Sistabilized α-TCP were established. The Mg contents of synthesized reagents were considerably lower than those in commercially available reactants. Pure Si-doped (2.5 at.-% of P by Si substitution) α-TCP was obtained by solid state reaction from synthetic reagents at temperature as low as 1200°C. When commercial reag...