Magnetic colloidal nanoparticles

Fan L, Li M, Lv Z, Sun M, Luo C, Lu F, Qiu H. Fabrication of magnetic chitosan nanoparticles grafted with p-cyclodextiin as effective adsorbents toward hydroquinol. Colloids Surf B Biointerfaces. 2012 95 42-9. 

Particularly attractive for numerous bioanalytical applications are colloidal metal (e.g., gold) and semiconductor quantum dot nanoparticles. The conductivity and catalytic properties of such systems have been employed for developing electrochemical gas sensors, electrochemical sensors based on molecular- or polymer-functionalized nanoparticle sensing interfaces, and for the construction of different biosensors including enzyme-based electrodes, immunosensors, and DNA sensors. Advances in the application of molecular and biomolecular functionalized metal, semiconductor, and magnetic particles for electroanalytical and bio-electroanalytical applications have been reviewed by Katz et al. [142]. 

Late transition metal or 3d-transition metal irons, such as cobalt, nickel, and copper, are important for catalysis, magnetism, and optics. Reduction of 3d-transition metal ions to zero-valent metals is quite difficult because of their lower redox potentials than those of noble metal ions. A production of bimetallic nanoparticles between 3d-transi-tion metal and noble metal, however, is not so difficult. In 1993, we successfully established a new preparation method of PVP-protected CuPd bimetallic nanoparticles [71-73]. In this method, bimetallic hydroxide colloid forms in the first step by adjusting the pH value with a sodium hydroxide solution before the reduction process, which is designed to overcome the problems caused by the difference in redox potentials. Then, the bimetallic species... 

Wang, Z.F., Xiao, P.F., Shen, B. and He, N.Y. (2006) Synthesis of palladium-coated magnetic nanoparticle and its application in Heck reaction. Colloids and Surfaces A Physicochemical and Engineering Aspects, 276 (1-3), 116-121. 

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