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Materiais e técnicas para nanoestruturas magnetoelétricas compósitas
(Universidade Federal de Santa Maria, 2014-12-19)
Hybrid nanostructures which integrate two or more technologically interesting physical properties are
fundamental for developing new generations of electronic devices. Exhibiting at least two coupled ferroic orders,
multiferroics ...
Estudo de primeiros princípios da estabilidade e funcionalização da superfície e nanofitas de carbeto de silício
(Universidade Federal de Santa Maria, 2014-10-24)
We use first principles calculations based upon the density functional theory to
investigate the stability, geometry, electronic and magnetic properties of cibic silicon
carbide (SiC) surfaces aligned along the (001) ...
Estudo da anisotropia unidirecional e da histerese rotacional em sistemas com exchange bias
(Universidade Federal de Santa Maria, 2014-08-18)
The exchange bias (EB) phenomen occurs due to the coupling between ferromagnetic and
antiferromagnetic material and the main characteristics are the rise of unidirectional anisotropy
and the rotational hysteresis in torque ...
Simulação ab initio de nanotubos de carbono funcionalizados via adsorção e deformação estrutural
(Universidade Federal de Santa Maria, 2014-08-29)
In this thesis the behavior of functionalized carbon nanotubes via chemical and physical
adsorption and estrural deformation is studied through ab initio calculations based
on the DFT formalism, using the SIESTA program. ...
Cálculos de primeiros princípios em isolantes topológicos: HgTe/CdTe
(Universidade Federal de Santa Maria, 2014-12-15)
The observation of the quantum spin Hall effect in the HgTe/CdTe heterostructure triggered
the study of materials exhibiting a spin polarized electronic current at their surfaces/
interfaces. These states are topologically ...
Síntese de pirazolo[1,5-a]pirimidinas e fluorfenilpirazóis trifluormetilados em ultrassom e síntese e aplicação de [2]rotaxanos
(Universidade Federal de Santa Maria, 2014-02-14)
This work presents the synthesis of three series of trifluoromethylated heterocycles
by using ultrasound irradiation, nomely pyrazolo[1,5-a]pyrimidines, 2,4-
difluorophenylpyrazoles and pentafluorophenylpyrazoles. The ...
Polímeros fluorados anfifílicos para aplicação em diagnósticos por imagens de ressonância magnética
(Universidade Federal de Santa Maria, 2014-12-17)
The goal of this study is to present kinetic studies of (co)polymerization as well
as the synthesis and characterization of amphiphilic copolymers with a fluorinated
segment. Copolymers were obtained by RAFT (co)polymerizations ...
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais
(Universidade Federal de Santa Maria, 2014-03-13)
Single sensitive sequential AdSV methods were developed and optimized for the determination of trace zirconium, vanadium, titanium and molybdenum in river, estuary and seawater, independent of the salinity and content of ...
Síntese regiosseletiva de 2-metiltiopirimidin-4(3h)-onas N3-substituídas, uracilas derivadas e bromacil análogos
(Universidade Federal de Santa Maria, 2014-01-31)
A series of twenty-seven 3,6-disubstituted 2-methylthiopyrimidin-4(3H)-ones that have as substituents at 6 position of the pyrimidine ring the groups Me, Ph, 4-Me-C6H4, 4-OMe-C6H4, 4-F-C6H4, 4-Br-C6H4 and at 3 position the ...
Avaliação do "magnetron sputtering" como técnica para obtenção de MgB2
(Universidade Federal de Santa Maria, 2014-08-26)
In this work a survey of the potentialities and limitations of magnetron sputtering as a
tool for the production of MgB2 superconductors thin films has been made. Instead of the usual
approaches, like co-deposition onto ...