Materials Literature
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Abstract The synthesis of functionalized submicrometer magnetic latex particles is described as obtained from a preformed magnetic emulsion composed of organic ferrofluid droplets dispersed in water. Composite (polystyrene/γ‐Fe 2 O 3 ) particles were prepared according to a two‐step procedure including the swelling of…
A 0.5% Al-doped Zn0.895Co0.100O polycrystalline powder was synthesized by the co-precipitation method. Raman spectroscopy revealed that divalent cobalt ions were substituted for Zn2+ ions into the ZnO matrix and that Al ions activate additional modes which are nonspecific to the dopant. These additional modes disappea…
We report pulsed field magnetization and ESR experiments on a {Cu3} nanomagnet, where antiferromagnetically coupled Cu(2+) (S = 1/2) ions form a slightly distorted triangle. The remarkable feature is the observation of a half step magnetization, hysteresis loops, and an asymmetric magnetization between a positive and…
Abstract Phosphonium‐modified layered silicate epoxy resin nanocomposites were evaluated by testing the thermal/thermo‐mechanical properties [differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), torsional pendulum, Sharpy toughness], flammability (limiting oxygen index LOI) and fire behavior (con…
Antimony (Sb) doping was used to realize p-type ZnO films on n-Si (100) substrates by molecular beam epitaxy. These samples were fabricated into p-n heterojunction diodes. p-type behavior of Sb-doped ZnO was studied by carrying out I-V and capacitance-voltage (C-V) measurements. I-V curves showed rectifying behavior s…
Pricking the surface: STM and EPR spectroscopy demonstrate the presence of color centers on thin MgO(001) films and their interaction with Au atoms. These systems are used to calibrate the IR stretching frequencies of CO bound to Au clusters. Clusters on regular MgO(001) terrace sites remain neutral while nucleation a…
We study by means of molecular dynamics simulations of periodic shear cells, the influence of particle shape on the global mechanical behavior of dense granular media. Results at macro-mechanical level show that for large shear deformation samples with elongated particles, independent of their initial orientation, rea…
When insulator LaAlO3 is grown by epitaxy onto a TiO2-terminated {100} surface of insulator SrTiO3, the resulting system has a metallic character. This phenomenon has been associated with an electrostatic frustration at the interface, as {100} surfaces of SrTiO3 are neutral while those of LaAlO3 are polar, but its mic…
We have characterized the structural and magnetic properties of low-temperature molecular-beam epitaxy grown Ge:Mn by means of high-resolution transmission electron microscopy (HR-TEM), energy dispersive x-ray spectroscopy, and superconducting quantum interference device (SQUID) magnetometry. We find a coherent incorp…
We propose the expression ℓ0∕(ℓ0+L) for the energy transmission covering both ballistic and diffusive regimes, where ℓ0 is mean free path and L is system length. With this formula, calculations of thermal conduction in carbon nanotubes (CNTs) show: (1) Thermal conductance at room temperature is proportional to the dia…
The effects of phosphate (P) limitation, varying salinity (5–65 psu), and solid media growth conditions on the polysaccharides produced by the model diatom, Phaeodactylum tricornutum Bohlin were determined. Sequential extraction was used to separate polymers into colloidal (CL), colloidal extracellular polymeric subst…
The experimental investigation of the Casimir force between a large metallized sphere and semiconductor plate is performed using an atomic force microscope. Improved calibration and measurement procedures permitted reduction in the role of different uncertainties. Rigorous statistical procedures are applied for the an…
A detailed study of poly- and single crystalline samples of the normal spinel HgCr2S4 is reported. The structural refinement reveals enhanced values of the atomic displacements suggesting closeness to a structural instability. Magnetization, electron-spin resonance and specific-heat studies document strong ferromagnet…
The size dependence of the ferroelectric properties of BaTiO3 nanowires is studied from first principles. We show that the ferroelectric distortion along the wire axis disappears below a critical diameter of about 1.2nm. This disappearance is related to a global contraction of the unit cell resulting from low atomic c…
We have developed a shell model potential to describe PbTiO3 and PbMg1/3Nb2/3O3 (PMN) by fitting to first-principles results. At zero pressure, the model reproduces the temperature behavior of PbTiO3, but with a smaller transition temperature than experimentally observed. We then fit a shell model potential for the co…
It has been known that edge states of a graphite ribbon are zero-energy, localized eigen-states. We show that next nearest-neighbor hopping process decreases the energy of the edge states at zigzag edge with respect to the Fermi energy. The energy reduction of the edge states is calculated analytically by first-order…
Abstract Silver nanoprisms with strong absorption in the near‐IR have been synthesized using a modification of the photoinduced method by illuminating preformed silver seeds under different illumination conditions. Low‐intensity light‐emitting diodes and white light combined with different color filters are used as li…
Thermodynamics in Materials Science, Second Edition is a clear presentation of how thermodynamic data is used to predict the behavior of a wide range of materials, a crucial component in the decision-making process for many materials science and engineering applications. This primary textbook accentuates the integrati…
Utilizing terahertz time domain spectroscopy, we have characterized the electromagnetic response of a planar array of split ring resonators (SRRs) fabricated upon a high resistivity GaAs substrate. The measured frequency dependent magnetic and electric resonances are in excellent agreement with theory and simulation.…
Abstract Several years ago a new material was introduced for use as an interconnect material for solid oxide fuel cell (SOFC) application. This new material is designated UNS S44535 and it has unique properties that make it an ideal choice in application as an interconnect material. The key properties are the coeffici…