Selenium nanoparticles

Kopeikin V, Valueva S, Kipper A, Borovikova L, Filippov A. Synthesis of selenium nanoparticles in aqueous solutions of poly (vinylpyrrolidone) and morphological characteristics of the related nanocomposites. Polym Sci Ser A Chem Phys 2003 45 374-9. 

Tran PA, Webster TJ. Selenium nanoparticles inhibit Staphylococcus aureus growth. Int J Nanomed 2011 6 1553. 

Figure 7.2 Representative 2-D nanostructured surfaces for bone-specific drug delivery systems, (a) Selenium nanoparticle-coated titanium surface, scale bar=500nm (reprinted from Ref. [54] with permission) (b) nanotubular anodized titanium surface, scale bar= 100 nm (reprinted from Ref. [26] with permission) (c) carbon nanotubes (CNT) grown out of anodized nanotubular titanium surface, scale bar=200nm (reprinted from Ref. [26] with permission) and (d) nanocrystaUine diamond surface, scale bar=200nm.

El-Batal, A. L, Omayma, A. R. A.Z., Eman, N., Effat, S. I. (2012). Promising antitumor activity of fermented wheat germ extract in combination with selenium nanoparticles. Journal... 

Tran, P.A., Webster, T.J., 2013. Antimicrobial selenium nanoparticle coatings on polymeric medical devices. Nanotechnology 24, 155101. 

Gao XY, Zhang JS, Zhang LD (2002) Hollow sphere selenium nanoparticles their in vitro anti hydroxyl radical effect. Adv Mater 14 290-293 Germ M, Stibilj V (2007) Selenium and plants. Acta Agric Slov 89-1 65-71 Germ M, Kreft I, Osvald J (2005) Influence of UV-B exclusion and selenium treatment on photochemical efficiency of photosystem II, yield and respiratory potential in pumpkins (Cucurbita pepo L.). Plant Physiol Biochem 43 445-448 Germ M, Stibilj V, Kreft I (2007) Metabolic importance of selenium for plants. Eur J Plant Sd Biotechnol l(l) 91-97... 

Zhang J, Taylor EW, Wan X, Peng D (2012) Impact of heat treatment on size, structure, and bioactivity of elemental selenium nanoparticles. Int J Nanomed 7 815-825. doi http //dx.doi. org/10.2147/IJN.S28538... 

Fig. 4 Selenium nanoparticles produced by the reduction of sodium selenite by Geobacter sulfurreducens which can also reduce Se(TV) and Te(IV), with c-type cytochromes implicated in the electron transfer to the metalloid. 

Kalinina, N.A., Silinskaya, I.G., Kipper, A.I., Valueva, S.V., Kopeikin, VV, and Filippov, A.P. (2004) Structuring in aqueous solutions of anionic polyelectrolyte nanocomposites with zero-valence selenium nanoparticles a polarized light scattering study. Polymer Science Series A, 46, 857-862. 

Stevanovic, M., Filipovic, N., Djurdjevic, J., Lukic, M., MUenkovic, M., Boccaccini, A., 2015. 45S5Bioglass(R)-based scaffolds coated with selenium nanoparticles or with polyjlactide-co-glycolide)/selenium particles processing, evaluation and antibacterial activity. Colloids Surf. B Biointerfaces 132, 208-215. 

As discussed earlier the whole process is a redox reaction. Selenium is reduced using sodium borohydride to give selenide ions. In the above reaction, the metal ion reacts with the polymer (PVP or PVA) solution to form the polymer-metal ion solution. Addition of the selenide ion solution to the polymer-metal ion solutions resulted in instantaneous change in the colour of the solutions from colourless to orange (PVA) and orange red (PVP). This indicates the formation of CdSe nanoparticles. The addition of the selenide solution to the polymer - metal ion solution resulted in gradual release of selenide ion (Se -) upon hydrolytic decomposition in alkaline media (equation 4). The released selenide ions then react with metal ion to form seed particles (nucleation). 

We have reported a simple, green, bench top, economical and environmentally benign room temperature synthesis of MSe (M=Cd or Zn) nanoparticles using starch, PVA and PVP as passivating agents. The whole process is a redox reaction with selenium acting as the oxidant and MSe as the reduction product. An entire "green" chemistry was explored in this synthetic procedure and it is reproducible. The optical spectroscopy showed that all the particles are blue shifted from the bulk band gap clearly due to quantum confinement. Starch capped CdSe nanoparticles showed the presence of monodispersed spherical... 

Cao D, Wieckowski A, Inukai J, Alonso-Vante N (2006) Oxygen reduction reaction on rathe-nium and rhodium nanoparticles modified with selenium and sulfur. J Electrochem Soc 153 A869-A874... 

As mentioned above, EXAFS studies on nanoparticles synthesized in either powder form or nanoparticles from the colloidal solution were performed. The coordination distances for ruthenium-selenium and ruthenium-ruthenium are, respectively, R(Ru-se) = 2.43 A y R(Ru.ru) = 2.64 A. The metal-metal coordination distance is of... 

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