High dielectric tunability, low dielectric loss tangent and appropriate level of dielectric constant are the basic requirements for applications as electrically tunable dielectric microwave devices. In our experiments, the SrTiO3 green compacts made of the powder mixtures with various particle sizes were infiltrated with a BaTiO3 precursor solution and sintered at different temperatures between 1280 and 1350 ºC for 2 hours and 1350 ºC for 6 hours. The sintering, microstructural and dielectric properties were investigated. Results showed that the relative density of SrTiO3 ceramics could reached 93% when sintered at 1280 ºC for 2 hours. When sintered for 6 hours at 1350 °C, the room temperature dielectric constant of SrTiO3 reaches 900 at a frequency of 1MHz. It has only weak temperature dependence between 100 and 500K. The reason of the low sintering temperature for the dense SrTiO3 ceramics and the effects of sintering scheme on the dielectric properties from 100 K to 500 K are discussed in this paper.

The nanoscale physical properties of newly electrospun polyamide nanofibrillar matrices < 1 year old versus those that were > 3 year old were investigated with transmission electron microscopy, selected area electron diffraction, contact angle measurements, and Raman spectroscopy. Significant differences in crystallinity, hydrophobicity, and chemistry were found and correspondingly different cell responses by cerebellar granular neurons were observed. The properties of the aged nanofibrillar scaffolds evoked a response for neuron burrowing into a more 3-dimensional environment in addition to better facilitation of neurite outgrowth. The nanophysical properties of tissue scaffolds have been recently shown to directly and indirectly regulate cellular responses. As physical properties can evolve over time, the present investigation addresses the issue of tissue scaffold shelf life, with possible changes in directive signals to cells.

We present a model for organic bistable devices (OBDs) embedded with metallic nanoparticles. In particular, two device architectures have been studied: a single layer device with metallic nanoparticles dispersed in a organic material matrix and a three layer device where two organic material regions are separated by a layer of heavy packed nanoparticles. The model describes the different behavior, the internal charge and potential distributions in the ON-OFF states. The OFF state is represented by charged nanoparticles forming a space charge layer which limits the current. The ON state occurs with neutral nanoparticles.

In this paper, we studied the optimization of preparation for polymeric optical waveguide based bus structures with embedded 45 degree micro-mirrors by metallic hard mold method. The 45º facets on the metallic hard mold, which were used to create the 45 degree micro-mirrors, were studied by the atomic force microscopy (AFM). The surface roughness of the 45 degree facets was reduced from 70nm to be 2nm by a photopolymer coating step. High speed test on the waveguide shows the low loss and high Q-factor performance of the waveguide structures. A backplane bus with 10 Gbits/sec channel will be reported.

The effect of silver nanoparticles showing localised plasmonic resonances on the efficiency of thin film silicon solar cells is studied. Silver (Ag) nanodiscs were deposited on the surface of silicon cells grown on highly doped silicon substrates, through hole-mask colloidal lithography, which is a low-cost and bottom-up technique. The cells have no back reflector in order to exclusively study the effect of the front surface on their properties. Cells with nanoparticles were compared with both bare silicon cells and cells with an antireflection coating. We optically observe a resonance showing an absorption increase controllable by the disc radius. We also see an increase in efficiency with respect to bare cells, but we see a decrease in efficiency with respect to cells with an antireflection coating due to losses at wavelengths below the plasmon resonance. As the material properties are not notably affected by the particles deposition, the loss mechanism is an important absorption in the nanoparticles. We confirm this by numerical simulations.

This work study the effect on aging thermal treatment on micro-alloyed steels API X70 pipe, microstructure and mechanical properties such a yield strength (Y), hardness (Hv) and Young´s modulus (E) are presented in this work. Thermal treatment consists of two phases: i) The solution treatment introducing samples in a electric induction furnace at 1100 °C for 30 min under argon atmosphere and water quenching, ii) aging process for five temperature in the range between 204 to 650 °C for 30 min of time exposition and water quenching, respectively. The microstructural characterization was examined by optical microscopy and matrix samples aging showed microstructures like acicular ferritic, polygonal ferritic and bainitic-ferritic, and the secondary phases were examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) obtained by SEM evidencing the presence of precipitates composed of vanadium (V), niobium (Nb) and titanium (Ti). The mechanical properties were evaluated by depth sensitive indentation test at the samples aging, the results showed increase of the (Hv) and (E)to the conditions of low temperature aging.

Convenient preparation of nano/micro scale topography is crucial for the fabrication of low-cost biodevices, which could be useful tools for understanding cell biology mechanisms and for the development of scaffolds for tissue engineering. Such intelligent surfaces have been conventionally fabricated through photolithography, micro-contact printing, and nano/micro imprinting. However, considering the process integration, these approaches are not always adequate in order to produce large dimensional patterns in a convenient and rapid way. In this study, we focused on the convenient fabrication of nano-wrinkles based on the elastic instability between a shape memory polymer sheet and a conductive polymeric film, on which the behavior of murine skeletal muscle cells (C2C12) was evaluated. A tens-of-nm-thick layer of poly(3,4-ethylenedioxythiophene) with poly(styrenesulfonate) (PEDOT:PSS) was spincoated on a thermo-retractable polymer sheet. Then, thermal treatment produced different periodicity of the unidirectional nano-wrinkles on the polymer sheet covered with different thickness of PEDOT:PSS layer. Finally, adhesion and proliferation of C2C12 were evaluated, comparing different samples. The cells preferentially adhered and anisotropically aligned on low and narrow ridges (1.5 μm height) rather than on high and wide ones (2.5 μm height). Furthermore, we observed that these trends were confirmed in the differentiation stage of C2C12 into myotubes. The combination of living cells and tunable nano-wrinkles made of conductive polymeric materials will represent a unique tool for the development of innovative biomedical devices.

Despite the many superior attributes of diamond, electronic device performance to date has fallen well behind theoretical expectation. The potential realization of highly efficient electronic polycrystalline diamond devices has been more than limited by certain technological challenges such as maintaining efficient/shallow n-type doping without higher density of defects or incorporation of sp2 bonded carbon as a result of doping(during ion implantation process). Specific n-type diamond reports demonstrating phosphorus doping (with activation energy reported in the range of 485 meV to 600 meV in (100) oriented systems have been particularly problematic as a lower solubility is found as compared to (111) oriented synthesis efforts, in addition to the reported self-compensating nature. Amongst the previous reports of Phosphorus-doped diamond nearly all experimental reports to date show visual crystallographic dislocation/pitting on the (100) facet with even moderate doping where dislocations have been observed to be incorporated into the bulk volume during growth. These dislocations, which are known carrier scattering sites, subsequently lower mobility rendering poor conductance and high resistivity. Due to this well-known sensitivity of phosphorus incorporation to the crystal quality, typically lower in polycrystalline than homoepitaxial films, polycrystalline-based experimental reports have been largely absent. With respect to Phosphorus in-situ doping based efforts, rendered films demonstrate both the visually identifiable pitting and electronically identifiable poor conduction characteristic, and with respect to ion beam doping efforts, complete graphitic flaking at even moderate doses (i.e. greater than 3x1017cm−3). Motivated by these shortcomings and the success of recent experimentation, we present the methodology and data from our recent successful fabrication of polycrystalline diamond P+-i-N junction (diode) with high crystal quality, high power handling capability, high current density, low threshold voltage, and ohmic contact, under room temperature operation, previously undemonstrated across all diamond material types. The superior electrical performance of the device was obtained by novel ion beam methodology designed to resolve previously unaddressed issues relating to n-type doping of diamond materials. A high current density of approximately 104 A/cm2 is attained at 20V forward bias.