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In this report new hybrid materials based on brushite-alginate and monetite-alginate were prepared by self-assembling alginate chains and phosphate source ions via a gelation process with calcium ions. The alginate served as nanoreactor for nucleation and growth of brushite or/and monetite due to its gelling and swelling properties. The alginate gel framework, the crystalline phase and morphology of formed hybrid biomaterials were shown to be strongly dependent upon the concentration of the phosphate precursors. These materials were characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDX).

Zirconia nanoparticles (NPs) with a pure tetragonal phase, stable at high temperatures and with hierarchical pore networks, are synthesized from gelling alginate by complexation of zirconium ions within a fibrous cross‐linked biopolymer. The concentration of precursor significantly affected the structural stability, crystal size, and crystal phase of the final material. The zirconia NPs were characterized by thermogravimetric analyses, nitrogen adsorption–desorption, X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy. The method developed herein is straightforward as well as flexible and can pave the way to a host of hierarchical materials for current nanotechnologies.