Materials Literature
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Polylactic acid is a polymer of great technological interest, whose excellent mechanical properties, thermal plasticity, and bioresorbability render it potentially useful for environmental applications, as a biodegradable plastic and as a biocompatible material in biomedicine. This article discusses the synthesis and…
The authors studied the low-field magnetoresistance of Sm1−xSrxMnO3 (x=0.45) which was sintered at different elevated temperatures followed by fast cooling (thermal quenching). Near the metal insulator transition the magnetoresistance is dramatically enhanced while the magnitude and width of the resistive peak are sig…
Fluorescent nanotubes (CdS-LNT) with hollow cylindrical morphologies are prepared, where CdS nanodots (NDs) in a face-centered cubic phase of the zinc blende structure have grown all over the bilayer membrane walls of a lipid nanotube (LNT). The hollow cylinder of the CdS-ND-embedded LNT was found to be able to load t…
Exchange biaslike phenomenon is observed in the Ba doped perovskite polycrystalline LaCoO3. The magnetic hysteresis loop shifts in both horizontal and vertical directions at 5K when the samples are cooled down to 5K in a magnetic field. The nature of this magnetic anisotropy is ascribed to the freezing properties of t…
<div class="htmlview paragraph">It is likely that use of urea-based selective catalytic reduction (SCR) will be needed to meet U.S. Tier 2 diesel emission standards for oxides of nitrogen (NO<sub>x</sub>). The ideal ratio of ammonia (NH<sub>3</sub>) molecules to NO<sub>x</sub>…
The thermal conductivity of GaN nanowires has been determined computationally by applying nonequilibrium atomistic simulation methods using the Stillinger-Weber [Phys. Rev. B 31, 5262 (1985)] potentials. The simulation results show that the thermal conductivity of the GaN nanowires is smaller than that of a bulk cryst…
Ge 3 Sb 2 Te 6 was analyzed in detail using an x-ray diffraction method. The crystal of this material in the space group R3¯m is characterized as a 33-layered cubic close-packed stacking structure. Te atoms fully occupy their specific layers, whereas Ge and Sb atoms are located in other layers thus causing partial ato…
A different kind of multiferroics with composite character, xLa0.7Sr0.3MnO3 (LSMO)–(1−x)ErMnO3 (EMO) (x=0.1, 0.2), where EMO is the ferroelectric (FE) and LSMO is the ferromagnetic (FM) component, has been studied. Magnetization versus magnetic field measurements at 300K show prominent hysteresis loops, attesting room…
<div class="htmlview paragraph">Unlike other gases, hydrogen can promote embrittlement of structural metals at ambient temperature. The effects of high-pressure hydrogen gas on structural metals vary significantly depending on material, environmental, and mechanical variables as well as the metric used to evalua…
Abstract A new chromophore, C1 , based on a similar DπA‐structure as in the FTC ‐chromophore but with a hydroxyalkyl spacer perpendicular to the direction of the dipole moment was synthesized. Both chromophores and the CLD ‐chromophore were used to prepare high T g nonlinear optical vinyl polymers. The influence of th…
It is shown that a prominent feature of ferroelectric-dielectric composites—the possibility of reducing their permittivity while keeping their tunability—may be substantially enhanced when using a ferroelectric matrix with “flatten” dielectric inclusions (inclusions with one dimension much smaller than two others). Th…
Abstract We report on a scaleable synthesis route for highly luminescent silicon nanocrystal assemblies and demonstrate that their emission properties are identical to those known for other systems containing silicon nanocrystals. Structural investigations confirmed that chemically porosified metallurgical grade silic…
Lipospheres in Drug Targets and Delivery: Approaches, Methods, and Applications presents an overview of the most recent applications of lipospheres primarily in the field of medicine, pharmaceutics, and biotechnology. It includes chapters on preparation, characterization, delivery (of peptides, proteins, vaccines, nuc…
<div class="htmlview paragraph">The use of urea-based selective catalytic reduction (SCR) is a promising method for achieving U.S. Tier 2 diesel emission standards for NO<sub>x</sub>. To meet the Tier 2 standards for Particulate Matter (PM), a catalyzed diesel particulate filter (CDPF) will likely be…
Ferroelectric photonic band-gap (PBG) structures are fabricated by the infiltration of sodium nitrite into the nanoporous silicon templates composed by the electrochemical etching of n-type silicon. Reversible spectral tuning of the PBG and of the microcavity mode up to 15nm is attained in the temperature interval fro…
Abstract This work demonstrates a method for non‐invasively monitoring the growth and Φ6 virus infection of Pseudomonas syringae bacteria using a 1‐D porous silicon photonic crystal and a white‐light source coupled to a CCD spectrometer. Bacteria growth on porous Si leads to increased scattering efficiency that can be…
Field Programmable Gate Arrays (FPGAs) are important hardware platforms in various applications due to increasing design complexity and mask costs. However, as CMOS process technology continues to scale, standard copper interconnect will become a major bottleneck for FPGA performance. In this paper, we propose utilizi…
Nanoimprint lithographically (NIL) prepared polymer film replicas of micrometer scale topographic master patterns are used as liquid crystal alignment surfaces. Depolarized transmission light microscopy study of nematic liquid crystal cells made using the replicas as one window shows that the NIL generated linear line…
Combining in situ studies of the catalyst activity during single-walled carbon nanotube (SWCNT) growth by mass spectrometry with differential scanning calorimetry and Raman spectroscopy results, the authors expose the favorable features of small catalyst for SWCNT growth and their relationship with synthesis parameter…
To produce surface plasmons, silver nanostructures were fabricated using a thermal evaporation method and the surface plasmon wavelength was tuned via an annealing. These nanostructures were located between the indium tin oxide (ITO) and poly(3,4-ethylenedioxy thiophene)/poly(styrenesulfonate) for the coupling of the…