Materials Literature
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The confinement of the two dimensional electron gas (2DEG), preferential occupancy of the Ti 3d orbital and strong spin-orbit coupling at the LaAlO$_3$/SrTiO$_3$ interface play a significant role in its emerging properties. Here we report a fourfold oscillation in the anisotropic magneto resistance (AMR) and the obser…
The paper presents the results of quantum-mechanical calculations of the mechanical properties of chiral carbon nanotubes. We assess the conditions under which the boundary effects can be neglected in the simulation. Tensile strength, Young's modulus and shear energy for optimized nanotubes geometry were identified. T…
We have prepared Li-intercalated Li x Bi 2 Sr 2 CaCu 2 O 8+δ ( x =0-2.0) samples by using electrochemical method, and performed synchrotron x-ray diffraction, Cu K -edge x-ray absorption fine structure (XAFS), and magnetic susceptibility measurements. With increasing x , a - and c -lattice parameters monotonically inc…
In the present work we report on the study of local atomic and electronic structure of gold nanoparticles funnctionalised by thiol and amine containing long-chain ligands. The study of nanoscale atomic structure is performed by means of X-ray absorption spectroscopy (XANES: X-ray Absorption Near-Edge Structure) and co…
Pesquisas e publicações sobre polímeros luminescentes vêm sendo desenvolvidas nos últimos anos devido à inovação acadêmica, porém ainda no âmbito nacional possuem aplicação industrial limitada.Marcadores ópticos processados são pouco explorados devido à dificuldade de processamento dos materiais poliméricos luminescen…
We argue that twisted (helicoidal) graphene nanoribbons may support dissipationless electric current in the presence of static uniform magnetic field. The non-resistive charge transfer in this parity-odd system should be enhanced by thermal fluctuations.
This thesis has the aim to develop new nanomaterials based on ceramic metal oxide semiconductors for energy applications. The synthesized materials were used for the assembly of electrodes to be used in the photoelectrochemical water-splitting reaction. TiO2-anatase nanofibers were prepared by sol-gel reaction, employ…
Ferroelectrics have shown potential as a promising alternative material for future photovoltaic applications. Observance of high open circuit voltages in ferroelectric thin films, have generated considerable interest in the field of ferroelectric photovoltaic in recent years. The field of ferroelectric photovoltaic is…
Autorizo a reprodução e divulgação total ou parcial deste trabalho, por qualquer meio convencional ou eletrônico, para fins de estudo e pesquisa, desde que citada à fonte. FICHA CATALOGRÁFICACacita, Natacha Estudo de um complexo trinuclear de rutênio como potencial liberador de óxido nítrico.Ribeirão Preto, 2013.106 p…
The kinetics of the electrodeposition of zinc to the steel base of the sulfate electrolyte supplements with synthetic surfactants was studied. Found that at potentials more positive than the equilibrium value the process of pre phase zinc deposition. Additives synthesized organic compounds adsorbed to the surface of t…
Binding of a flexible polymer chain to a solid surface or air-water interface affects its conformational freedom. A polymer covalently grafted to a surface can adopt three dimensional conformations, limited however by interactions with the surface and the neighboring chains. A dense grafting of polymers forces the pol…
The aim of the present work was to characterize the sorption mechanisms and biodegradation role in the removal of some organic micropollutants (i.e. anticancer drugs) by biological sludges, including those of membrane bioreactor (MBR). The first step consisted in the development of an analytical method for the trace d…
We compute the Fermi velocity of the Dirac quasiparticles in clean graphene at the charge neutrality point for strong Coulomb coupling alpha_g. We perform a Lattice Monte Carlo calculation within the low-energy Dirac theory, which includes an instantaneous, long-range Coulomb interaction. We find a renormalized Fermi…
This chapter contains sections titled: References
This chapter contains sections titled: Publications of Effect Studies on Granular Biopersistent Nanodusts (GBND) and Metal Nanoparticles References
The decay of the optical phonon into the two phonons of smaller energy is calculated for Si nanocrystals. The rate of the process is in the range of 1 to 10 ps. Such anharmonic phonon decay may control the energy relaxation rate of excited carriers in Si/SiO$_2$ nanocrystals. Relevance of the phonon decay to the exper…
The properties of MXenes, a new group of quasi-two-dimensional d-metal carbide or nitride nanomaterials derived by chemical exfoliation from the MAX phases, can be very sensitive to the presence of surface functional groups. Herein, the MXenes Ti2C and Ti3C2 functionalized by methoxy groups are considered by means of…
The West African soft cheese (wara) is traditionally produced using latex extracts of the leaves of Calotropis procera. Even though no death has been apparently traced to it, the extract is said to be poisonous causing death by paralysis of the heart. This project, therefore, aims at obtaining an alternative (in this…
This chapter contains sections titled: Characterization of Nanomaterials and Exposure Assessment Grouping of Nanomaterials Identification of Relevant Endpoints for Risk Assessment and Threshold Value Setting under Realistic Exposure Conditions Research Needs References
The goal of this project is to determine changes in adsorption and desorption of fission products to/from nuclear-grade graphite in response to a changing chemical environment. First, the project team will employ principle calculations and thermodynamic analysis to predict stability of fission products on graphite in…