Araraquara, Brazil
Araraquara, Brazil

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Cebim M.A.,Institute Quimica Of Araraquara | De Souza Oliveira H.H.,Institute Quimica Of Araraquara | Barelli N.,Institute Quimica Of Araraquara | Davolos M.R.,Institute Quimica Of Araraquara
Quimica Nova | Year: 2011

In this work is presented a versatile system for X-ray excited optical luminescence (XEOL) measurements. The apparatus was assembled from a sample holder connected to an optical fiber responsibly for the acquisition of the scintillation signal. The spectrum is registered with a CCD coupled in a spectrograph provided with diffraction gratings. The system performance was analyzed by exciting GdAlO3:Eu3+ 3.0 at.% with X-rays from a diffractometer and measuring the emission spectra. The system can be used to obtain precise and reliable spectroscopic properties of samples with various conformations without the loss of the required safety when dealing with ionizing radiations.

Arantes F.C.C.,Institute Quimica Of Araraquara | Moro A.C.,Institute Quimica Of Araraquara | Klein I.S.,Institute Quimica Of Araraquara | Da Silva C.,Institute Quimica Of Araraquara | And 3 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2011

The synthesis, spectroscopic characterization, and thermal analysis of the compounds [Pd(X)2(mtu)(PPh3)] (X = Cl- (1), SCN- (2); mtu = N-methylthiourea; PPh3 = triphenylphosphine) and [Pd(X)2(phtu)(PPh3)] (X = Cl - (3), SCN- (4); phtu = N-phenylthiourea) are described. The thermal decomposition of the compounds occurs in two, three, or four stages and the final decomposition products were identified as Pd0 by X-ray powder diffraction. The thermal stability order of the complexes is 4>3>2>1. © 2011 Akadémiai Kiadó, Budapest, Hungary.

Sargentelli V.,Institute Quimica Of Araraquara | Ferreira A.P.,Institute Quimica Of Araraquara
Ecletica Quimica | Year: 2010

The development of nanoparticles has been intensively pursued because of their technological importance. The magnetic nanoparticulate materials exhibit a series of interesting properties between which are mentioned the electrical, optical, magnetic and chemical properties. Magnetic nanostructures can be used in microelectronic and in medicine as in: magnetic memory storage, magnetic transport of biochemical complexes, magnetic resonance imaging, among others. The magnetic properties of nanoparticles there are very sensitive to its size and form. In this direction, many efforts they have been carried through with the intention of to control the form and distribution of the size of the nanoparticles. In the last few decades nanoparticles constituted by iron oxides had been studied. However, more recently, the focus of the researches has come back to others transitions metals. Amongst these, the cobalt comes being investigated due to its high magnetic susceptibility. In this context, the present article has the aim of to presents and to effect a comparative analysis of the more significant synthetic ways utilized in the present momentto obtain cobaltnanoparticles.

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