Materials Literature
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Electron nanodiffraction, particularly as performed in a dedicated STEM instrument with coherent illumination, provides, in principle, a means for obtaining information on structural detail in the range between that of STEM image resolution, about 0.2 nm, and the limits of information possible from elastic scattering…
Because it has been well-known that the effective exchange interaction of spins is much larger within a molecule than between molecules, it is very important to design high-spin polymers linking high-spin molecules with each other as a constituent unit to obtain molecule-based ferromagnetic materials with high transit…
Well-defined α,ω-methacryloyl poly-ε-caprolactone (PCL) and poly(d,l)-lactide P(D,L)LA dimacromonomers have been synthesized by living ring-opening polymerization of the parent monomers initiated by diethylaluminum 2-hydroxyethylmethacrylate (Et2AlO(CH2)2OC(O)C(CH3)CH2) and terminated by reaction of the propagat…
Compatibilization of polystyrene/polypropylene (PS/PP) blends, by use of a series of butadiene–styrene block copolymers was studied by means of small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The compatibilizers used differ in molar mass and the number of blocks. It was shown that the a…
The low-temperature fluorescence of single CdS nanocrystals and of single CdS/HgS/CdS quantum well quantum dots (QDQW's) where an atomic monolayer of HgS is embedded in a CdS nanocrystal is compared. The fluorescence spectrum of the CdS nanocrystals depends strongly on the laser excitation intensity. At high excitatio…
Depth-resolved measurements of the photoluminescence of Si implanted and annealed SiO2 films on Si have been performed to determine the depth distribution of luminescent Si nanocrystals. Si nanocrystals with diameters ranging from ∼2 to 5 nm were formed by implantation of 35 keV Si ions into a 110-nm-thick thermally g…
We demonstrate that the half-doped bilayer manganite La_{1}Sr_{2}Mn_{2}O_{7} exhibits CE-type charge-ordered and spin-ordered states below $T_{N, CO}^A = 210$ K and below $T_{N}^{CE} \sim 145$ K, respectively. However, the volume fraction of the CE-type ordering is relatively small, and the system is dominated by the…
The microstructure and domain structures of high performance temperature-compensated sintered magnets with composition of Sm0.56GdxDy0.44−x(TM)7.22 (TM=Co0.68Fe0.22Cu0.08Zr0.02)7.22 (0.0⩽x⩽0.4) have been investigated by using electron microscopy and magnetic force microscopy. Both microstructure and magnetic propertie…
Low-energy electron diffraction intensity vs voltage (LEED I-V) measurements and analysis are used to determine the multilayer surface relaxation of W(110). Measurements and analysis are presented for both flat and vicinal surfaces, demonstrating that surface roughness leads to only small errors in LEED structure dete…
The nature of the interaction between highly oriented pyrolitic graphite (HOPG) and adsorbed Ti is examined by soft x-ray photoelectron spectroscopy. By monitoring the C $1s$ signal, it is found that Ti does not chemically bond to, but only interacts through the Van der Waals force with, a pristine HOPG surface. Time-…
Recent studies with the anthracycline Adriamycin have demonstrated its activation by formaldehyde and subsequent binding to DNA in vitro. Since formaldehyde levels are known to be higher in cells of myeloid origin and the structurally related drug mitoxantrone is most effective against cancers of myeloid origin, this…
We study the effect of wall–fluid interactions on the state conditions and the effective properties of a model dodecane fluid confined between parallel solid walls. A significant increase in the effective density of the confined fluid is observed with increasing strength of the wall–fluid interaction. The effect of th…
We report the results of magnetization measurements on powder samples of [NiCu(pba)(D 2 O) 3 ]·2D 2 O (pba=1,3-propylenebis(oxamato),C 7 H 6 N 2 O 6 ) and [Ni(dpt)(H 2 O)Cu(pba)]·2H 2 O (dpt=bis-(3-aminopropyl)amine, C 6 H 17 N 3 ), which are regarded as the S =1/2 and 1 ferrimagnetic chain and dimer, respectively. Th…
Transparent, conductive indium tin oxide (ITO) films were fabricated by pulsed-laser deposition on substrates held at room temperature. We investigated the relationship between electrical/optical properties of the films and the material stoichiometry, measured by Rutherford backscattering. The lowest resistivity films…
Using the sol–gel method, PbTiO3 films of 21, 64, 128, 210, 310, and 420 nm thicknesses were obtained on (0001) sapphire. Raman scattering and x-ray diffraction techniques were used to study the correlation between the film thickness and the structural changes on these films. The Raman and x-ray intensities in 21 nm f…
We demonstrate compaction of DNA with nanoscale biomimetic constructs which are robust synthetic analogs of globular proteins. These constructs are approximately 15 nm in diameter, shell crosslinked knedel-like (SCKs) nanoparticles, which are prepared by covalent stabilization of amphiphilic di-block co-polymer micell…
Porous silicon Fabry-Pérot optical filters with reflectivity peaks in the visible and near infrared spectral range have been manufactured electrochemically and characterized with variable angle spectroscopic ellipsometry. Generalized ellipsometry and the Bruggeman effective medium approximation were employed to study…
The DNA binding domain of H-NS protein was studied with various N-terminal deletion mutant proteins and identified by gel retardation assay and heteronuclear 2D- and 3D-NMR spectroscopies. It was shown from gel retardation assay that DNA binding affinity of the mutant proteins relative to that of native H-NS falls in…
Fluorinated ether ketone oligomers bearing a crosslinkable ethynyl group at the chain end have been investigated for low-loss polymer optical waveguide devices. These oligomers are designed to achieve low birefringence and were synthesized by the reaction of 4,4′-(hexafluoroisopropylidene)diphenol with an excess decaf…
During ion etching (IE) processes used for making a Pt electrode in the fabrication of ferroelectric capacitors, the film is exposed to radiation and energetic ion bombardment. The influence of such processes on polarization-electric field characteristics of lead zirconate titanate thin film capacitor has been reporte…