Materials Literature
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In this study silica- and alkoxysilane-coated ultrasmall superparamagnetic iron oxide (USPIO) particles were synthesized, and their ability to label immortalized progenitor cells for magnetic resonance imaging (MRI) was compared. USPIO particles were synthesized by coprecipitation of ferric and ferrous salts. Subseque…
Hydrogen-bonding amphiphilic low molecular weight plasticizing compounds to one block of diblock copolymers to form supramolecular comblike blocks leads to hierarchical self-assembly at the block copolymer (long) and amphiphile (short) length scales, in which lamellar-in-lamellar order and the related phase transition…
Polyamorphism, i.e. the presence of more than one amorphous state, was observed for the first time in amorphous ice or glassy water. In addition to LDA (low-density amorphous ice), a second amorphous state, HDA (high-density amorphous ice), was discovered ∼20 years ago. Since then, polyamorphism has been observed in m…
Colloidal microgels have recently received attention as environmentally responsive systems and now are increasingly used in applications as carriers for therapeutic drugs and diagnostic agents. Synthetic microgels consist of a crosslinked polymer network that provides a depot for loaded drugs, protection against envir…
[{Dy(hfac)(3)}(2){Fe(bpca)(2)}] x CHCl(3) ([Dy(2)Fe]) and [{Dy(hfac)(3)}(2){Ni(bpca)(2)}]CHCl(3) ([Dy(2)Ni]) (in which hfac(-)=1,1,1,5,5,5-hexafluoroacetylacetonate and bpca(-)=bis(2-pyridylcarbonyl)amine anion) were synthesized and characterized. Single-crystal X-ray diffraction shows that [Dy(2)Fe] and [Dy(2)Ni] are…
The fact that in vivo the extracellular matrix (ECM) or substratum with which cells interact often includes topography at the nanoscale underscores the importance of investigating cell-substrate interactions and performing cell culture at the submicron scale. An important and exciting direction of research in nanomedi…
From first-principles calculations, we predict that a single ethylene molecule can form a stable complex with two transition metals (TM) such as Ti. The resulting TM-ethylene complex then absorbs up to ten hydrogen molecules, reaching to gravimetric storage capacity of approximately 14 wt %. Dimerization, polymerizati…
In this paper, we explore electron filtering as a technique to increase the Seebeck coefficient and the thermoelectric power factor of heterostructured materials over that of the bulk. We present a theoretical model in which the Seebeck coefficient and the power factor can be increased in an ${\mathrm{In}}_{0.53}{\mat…
Quantification of mixtures via the Rietveld method is generally restricted to crystalline phases for which structures are well known. Phases that have not been identified or fully characterized may be easily quantified as a group, along with any amorphous material in the sample, by the addition of an internal standard…
We show that the symmetry of the spin zigzag chain E phase of the orthorhombic perovskite manganites and nickelates allows for the existence of a finite ferroelectric polarization. The proposed microscopic mechanism is independent of spin-orbit coupling. We predict that the polarization induced by the E-type magnetic…
Abstract A novel approach is proposed to derive a theoretical curve, δ( E P ), from the equation for construction of a database of the secondary electron emission ( k , α), where δ( E P ) and [d E /d z ] are the secondary yield and energy dissipation in depth, respectively, for incident electrons of primary energy, E…
The homogeneous crystallization of liquid rubidium models containing 500, 998, and 1968 particles in the basic cube was studied by the molecular dynamics method. The liquid crystallized over the temperature range 70–182.5 K predominantly with the formation of a body centered cubic (BCC) structure. The mechanism of cry…
Ceramic coatings are fabricated on pure aluminium by plasma electrolytic oxidation (PEO) in three kinds of electrolyte systems [E1: 0.05M NaOH+0.033M Na 2 SiO 3 , E2: 0.025M NaOH+0.008M (NaPO 3 ) 6 and E3: 0.025M NaOH+0.066M Na 2 SiO 3 +0.008M (NaPO 3 ) 6 ]. The voltage–time responses show that the PEO process of E2 h…
Abstract Reticular nickel microwires assembled from different‐shaped building blocks are fabricated by a simple, one‐pot method in the absence of any surfactants or external magnetic field. The synthetic process involves the chemical reduction of a nickel complex with hydrazine under controlled reaction conditions. Ou…
Nuclear quadrupole resonance (NQR) experiments were performed on glassy ${\mathrm{As}}_{x}{\mathrm{Se}}_{1\ensuremath{-}x}$ to study the local structural order. The bonding in ${\mathrm{As}}_{x}{\mathrm{Se}}_{1\ensuremath{-}x}$ is governed by preferential bonding (chemical ordering) between arsenic and selenium at ars…
In this paper, the influence of energy recuperation on the efficiency of a solid oxide fuel cell (SOFC) power system is studied with the GCTool software developed by the American Argonne National Laboratory (ANL). The recuperative energies include partial recycled air exhausted from cathode side, recirculated fuel and…
Chemical reactions have been induced in condensed acetaldehyde by exposure to low-energy electrons as demonstrated by use of high-resolution electron energy loss (HREEL) spectroscopy and thermal desorption spectroscopy (TDS). The HREEL spectra show that the acetaldehyde film is modified significantly when the incident…
The evaluation of uncertainties in doses from intakes of radionuclides is one of the most difficult problems in internal dosimetry. In this paper, the process of assessing internal doses from monitoring measurements is reviewed and the major sources of uncertainty are discussed. Methods developed independently at HPA…
A brief description of the basic spectroscopic properties of Tm3+-doped 20Ge-5Ga-10Sb-65S (GeGaSbS) glass is presented. Spontaneous-emission probabilities, radiative lifetimes, branching ratios, and quantum efficiency of Tm3+ in GeGaSbS glass are evaluated by use of Judd-Ofelt theory. Lifetime measurements are carried…
Zinc oxide (ZnO) single crystals are grown by the modified vertical Bridgman method using a PbF 2 flux. The maximum size of the as-grown ZnO crystal is about ϕ25 mm × 5 mm. The transmittance of the as-grown ZnO crystal is more than 70% in the range of 600–800 nm and the optical band gap is estimated to be 3.21 eV. The…