A versatile and environmentally friendly method for the synthesis of various organophosphorus compounds have been developed using a heterogeneous catalysis technology. We have synthesized a series of the αhydroxyphosphonates, a biologically important class of compounds, via the Pudovik reaction between dialkylphosphite and aldehydes or ketones using sodium-modified fluorapatite (Na@FAP) as a highly efficient basic solid catalyst under solventless conditions at room temperature. Catalyst reuse, ease of separation of the pure product, and high yields are some of the unique features of this process.
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.