Transitions chemical surface modifications

We have prepared nanoneedles of mixed Co oxide using the sonochemical method for decomposing metal complexes. Resulted nanoparticles are rather well-ordered structures with the average size of 23 nm in length and 5 nm in diameter. Magnetic measurements revealed the ferromagnetic transition at 25 K, which can be explained by the chemical surface modification of the particles. 

Because the variety of chemical functional groups that can be adsorbed on aluminas is so diverse, a third group of surface modifications is becoming more popular. They involve chemical treatment of the alumina surface in order to introduce new functionalities which can enhance adsorption. An example of such a modification is given in Figure 10. A transition alumina surface is silanized through a condensation reaction with a commercial triethoxysilane. The synthesized surface exhibits quite different properties than the base alumina and can be used for applications such as reversed phase chromatography. 

Kitchin JR, Nprskov JK, Barteau MA, Chen JG. 2004. Modification of the surface electronic and chemical properties of Pt(lll) by subsurface 3d transition metals. J Chem Phys 120 10240-10246. 

Fig. 3 Strategy for chemical modification of the TTF molecule to increase or decrease the electronic dimensionality (D) by the aid of enhance or suppress the self-aggregation ability of the donor molecules, respectively. Typical Fermi surfaces of TMTSF (a (TMTSF)2NbF6), BO (b (BO)2.4l3), TTP (c (BEDT-TTP)2l3, Scheme 8) [88], ET (d / -(ET)2l3), and EDO (e (EDO)2PEg) CT solids are depicted. PIPT photo-induced-phase-transition...

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