Materials Literature
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Abstract A novel fluorinated bis(ether amine) monomer, 2,6‐bis(4‐amino‐2‐trifluoromethylphenoxy) naphthalene, was prepared through the nucleophilic aromatic substitution reaction of 2‐chloro‐5‐nitrobenzotrifluoride and 2,6‐dihydroxynaphthalene in the presence of potassium carbonate, followed by catalytic reduction wit…
Electrically commanded surfaces (ECS) is a liquid crystal display concept whereby the switching of the alignment layer, which is driven by an electric field applied across the layer, is further transferred to the bulk liquid crystal material via elastic forces. This work presents the electro-optic response of a sandwi…
Ga 2 O 3 : Dy 3 + and Li+-doped Ga2O3:Dy3+ phosphor films were prepared by a Pechini sol-gel process. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy, and photoluminescence (PL) spectra as well as lifetimes were used to characterize the resulting thin films (and powder…
Polymer-coated metal or metal oxide nanoparticles have a variety of uses in industry, biological research, and medicine. Characterization of nanoparticles often includes determination of the dimensions of the electron-dense core by transmission electron microscopy (TEM), with the weight of the core determined from cor…
In the post-genomic era, functional prediction of genes is largely based on sequence similarity searches, but sometimes the homologues bear different roles because of evolutionary adaptations. For instance, the existence of enzyme and non-enzyme homologues poses a difficult case for function prediction and the extent…
Amylose- block -polystyrenes with various block copolymer compositions were investigated in water and in THF solution. Fluorescence correlation spectroscopy, dynamic light scattering (DLS), and asymmetric flow field-flow fractionation with multiangle light scattering detection indicate the presence of unimers, oligome…
The structural and electronic properties of $\mathrm{La}\mathrm{Mn}{\mathrm{O}}_{3}$ under hydrostatic pressure are investigated by means of ab initio $\mathrm{LDA}+\mathrm{U}$ calculations, based on ultrasoft pseudopotentials. Previous theoretical studies have indicated that the local-density approximation (LDA) inco…
The diverse steady-state spectroscopic properties of poly(di-n-octylfluorene) are addressed from a molecular-level perspective. Modeling of representative oligomers support the experimental observation of at least three distinguishable classes of conformational isomers with differing chain torsion angles. One class ap…
Stylolites are natural pressure-dissolution surfaces in sedimentary rocks. We present 3D high resolution measurements at laboratory scales of their complex roughness. The topography is shown to be described by a self-affine scaling invariance. At large scales, the Hurst exponent is $ζ_1 \approx 0.5$ and very different…
The silver-p-phenylene (Ag-PPP) interface is investigated using ballistic electron emission microscopy (BEEM). Multiple injection barriers and spatial nonuniformity of carrier injection over nanometer length scales are observed. No unique injection barrier is found. Physical reasons for these features are discussed. B…
Domain walls in nano-constrictions are investigated with a focus on thermal properties. In general, the magnetization component perpendicular to the easy axis which in a domain wall usually occurs has a value different from the easy-axis bulk magnetization value with a separate phase transition at a critical temperatu…
In this work, we present an investigation of the Ag-PPP (polyparaphenylene) interface using ballistic electron emission microscopy. Our work is the first successful application of the BEEM technique to metal-organic interfaces. We observe nanometer scale injection inhomogeneities. They have an electronic origin, since…
A number of transition-metal- (TM) doped group-IV semiconductors, ${R}_{x}{Y}_{1\ensuremath{-}x}$ $(R=\mathrm{Cr},\mathrm{Mn},\mathrm{Fe};\phantom{\rule{0.3em}{0ex}}Y=\mathrm{Si},\mathrm{Ge})$, have been studied by the first-principles calculations. The results obtained show that antiferromagnetic (AFM) order is energ…
Theory predicts that the currents in scanning tunneling microscopy (STM) and the attractive forces measured in atomic force microscopy (AFM) are directly related. Atomic images obtained in an attractive AFM mode should therefore be redundant because they should be \emph{similar} to STM. Here, we show that while the di…
We report a first-principles projector augmented wave (PAW) study on ${\mathrm{Na}}_{0.5}{\mathrm{CoO}}_{2}$. With the sodium ion ordered insulating phase being identified in experiments, pure density functional calculations fail to predict an insulating ground state, which indicates that $\mathrm{Na}$ ordering alone…
Above room temperature ferromagnetic behavior is achieved in Si through Mn ion implantation. Three-hundred-keV ${\mathrm{Mn}}^{+}$ ions were implanted to 0.1% and 0.8% peak atomic concentrations, yielding a saturation magnetization of $0.3\phantom{\rule{0.3em}{0ex}}\mathrm{emu}∕\mathrm{g}$ at $300\phantom{\rule{0.3em}…
Nonspecific protein adsorption generally occurs at the biomaterial-tissue interface and usually has adverse consequences. Thus, surfaces that are protein-resistant are eagerly sought with the expectation that these materials will exhibit improved biocompatibility. Surfaces modified with end-tethered poly(ethylene oxid…
We discuss the properties of semiconducting bulk ZnO when substituted with the magnetic transition metal ions Mn and Co, with substituent fraction ranging from $x=0.02$ to $x=0.15$. The magnetic properties were measured as a function of magnetic field and temperature and we find no evidence for magnetic ordering in th…
Electron and thermal transport properties, i.e., electrical conductivity, carrier concentration, Hall mobility, Seebeck coefficient, thermal conductivity, of heavily La- or Nb-doped SrTiO3 (STO) bulk single crystals were measured at high temperatures, (300–1050K) to clarify the influence of doping upon the thermoelect…
This paper presents theory and simulation of flow-induced structures in liquid crystalline materials, useful to the creation of synthetic material structures and to the biomimetics of natural fibers. A multiscale theory and simulation of hydrodynamic texture formation is presented; it provides fundamental principles f…