Straightforward phase-transfer route to colloidal iron oxide nanoparticles for protein immobilization

© The Royal Society of Chemistry 2015. We report for the first time the effective transfer of hydrophobic oleate-capped iron oxide nanoparticles to an aqueous phase upon treatment with a base bath cleaning solution. We discuss the mechanism of the phase transfer, which involves the elimination of the organic capping agent followed by ionic stabilization of the nanoparticles due to negatively charged Fe-O- surface species. The resultant superparamagnetic aqueous nanocolloid shows excellent protein immobilization capability.status: publishe

Synthetic strategy for metallophthalocyanine covalent organic frameworks for electrochemical water oxidation

International audienceAtomically dispersed metal catalysts are interesting materials for electrocatalysis. To this end, covalent organic frameworks (COFs) offer an excellent opportunity for the periodic placement of catalytically active single metal atoms within a porous framework. We report here a synthetic strategy to a series of imide-linked metal-containing phthalocyanine (Pc) COFs with different metal contents. Electrocatalytic activity of the materials towards oxygen evolution reaction was studied under alkaline conditions and the COF prepared from NiPc showed the best performance with current density j ¼ 10 mA cm À2 being reached at overpotential h 10 z 410 mV and Tafel slope of b ¼ 75 mV/dec. In addition, the material showed excellent long-term stability during the testing time of 100 h

Synthesis of Nanoparticles via Solvothermal and Hydrothermal Methods

This chapter summarizes the synthesis of various types of nanoparticles as well as surface modifications of nanomaterials using hydrothermal and solvothermal methods. First, the definition, history, instrumentation, and mechanism of hydrothermal and solvothermal methods as well as the important parameters affecting the nucleation and crystal growth of nanomaterials are briefly introduced. Then, the specific hydrothermal and solvothermal methods used to grow oxides; Groups II–VI, III–V, and IV; transitional metals; and metal-organic framework nanoparticles are summarized. Finally, the hydrothermal and solvothermal strategies used for the surface modification of nanomaterials are discussed