Materials Literature
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The grain microstructure is strongly bimodal due to the mixture of large dendritic grains that solidify in the shot sleeve and are subsequently injected into the die cavity, and the small grains that nucleate inside the cavity and grow to a size dictated by the solute content and the solidification rate. The large gra…
OBJECTIVES: Creating functional small-diameter tissue-engineered blood vessels has not been successful to date. Moreover, the processes underlying the in vivo remodeling of these grafts and the fate of cells seeded onto scaffolds remain unclear. Here we addressed these unmet scientific needs by using intravital molecu…
Poly(amidoamine) (PAMAM) dendrons were synthesized with c(RGDyK) peptide on the surface to create a scaffold for cellular targeting and multivalent binding. Binary dendron-RGD conjugates were synthesized with a single Alexa Fluor 488, biotin, methotrexate drug molecule, or additional functionalized dendron at the foca…
The luminescent lifetime of cerium-doped yttrium aluminum garnet has been determined as a function of temperature and as a function of gallium content. We have shown that increasing gallium content decreases the decay lifetime and results in luminescence quenching at lower temperatures. The results are quantitatively…
Abstract The polymorphic crystalline structure and melting behavior of biodegradable poly(butylene adipate) (PBA) samples melt‐crystallized at different crystallization temperatures were studied by differential scanning calorimetry (DSC) and fourier transform infrared (FTIR) spectroscopy. The crystalline structure and…
Silica coated, PEI and citric acid hybrid superparamagnetic magnetite nanocrystal clusters (SMNC) were synthesized using either a mini-emulsion/sol-gel method or a polyol technique. After careful characterization of the size, structure, composition, and magnetic properties, the as-synthesized SMNC were used for cell l…
A theoretical study on the thermodynamic stability and electronic properties of wurtzite (WZ) and zincblende (ZB) ZnO x S 1− x as been carried out with first-principles methods. Special quasi-random structures (SQSs) are employed to model the random alloys and from the calculated phase diagram, it is clear that the so…
There is a great interest in smectic materials that show no layer shrinkage (NLS) in the transition from smectic A to smectic C. Such materials are often discussed in terms of “de Vries materials” or “de Vries behavior” after A. de Vries, who proposed different mechanisms for this NLS behavior, involving a significant…
Intrinsic ferromagnetism in CeO(2) is a source of controversy in the literature and has been linked to the excess electrons left over upon oxygen vacancy formation on Ce sites neighbouring the vacancy. A recent theoretical study (Han et al 2009 Phys. Rev. B 79 100403) concluded that increased vacancy concentration cha…
Porphyrin is a key cofactor of hemoproteins. The complexes it forms with divalent metal cations such as Fe, Mg, and Mn compose an important category of compounds in biological systems, serving as a reaction center for a number of essential life processes. Employing density functional theory (DFT) and conceptual DFT ap…
Experimental solubilities of budesonide, hydrocortisone, and prednisolone in ethanol + water mixtures at 298.2 K are reported. The solubility of drugs was increased with the addition of ethanol and reached the maximum values of the volume fractions of 90 %, 80 %, and 80 % of ethanol. The Jouyban−Acree model was used t…
Vertically aligned carbon nanotube (CNT) arrays are grown on a moving substrate, demonstrating continuous growth of nanoscale materials with long-range order. A cold-wall chamber with an oscillating moving platform is used to locally heat a silicon growth substrate coated with an Fe/Al2O3 catalyst film for CNT growth…
AlN films doped with 3.2–8.2 at. % Cu were deposited by helicon magnetron sputtering. The films exhibited ferromagnetism with a Curie temperature above 360 K. The observed magnetic anisotropy and exclusion of ferromagnetic contamination indicated that the ferromagnetism was the intrinsic property of Cu-doped AlN films…
We report transistor characteristics and field-modulated thermopower (S) for single crystal SrTiO3-based field-effect transistors (FETs). We use 150-nm-thick amorphous 12CaO⋅7Al2O3 glass as the gate insulator of the SrTiO3-FET. The resulting SrTiO3-FET exhibits excellent transistor characteristics at room temperature:…
Graphene devices require electric contacts with metals, particularly with gold. Scanning tunneling spectroscopy studies of electron local density of states performed on mono-, bi-, and trigraphene layer deposited on metallic Au/Cr/SiO2/Si substrate shows that gold substrate causes the Fermi level shift downwards which…
We demonstrate the growth of phosphorus doped Zn(1-x)Mg(x)O nanowire (NW) using pulsed laser deposition. For the first time, p-type Zn(0.92)Mg(0.08)O:P NWs are likely obtained in reference to atomic force microscopy based piezoelectric output measurements, X-ray photoelectron spectroscopy, and the transport property b…
X-ray absorption fine structure (XAFS) spectroscopy has been employed to investigate the cation distribution in nanocrystalline zinc ferrites (ZnFe(2)O(4)), synthesized in acidic and basic media at different temperatures. By using (Zn(1-x)Fe(x))[Ni(x)Fe(2-x)]O(4) as model compounds we have determined cation distributi…
Large-scale arrays of N-doped ZnO nanorods have been synthesized on quartz substrates by pulsed laser deposition techniques. The ZnO/N nanorods have a diameter of 150–200 nm and a length of 1–1.5 µm. X-ray photoelectron spectroscopy analysis confirmed the implantation of nitrogen into the nanorod arrays and Raman scat…
Various sizes of gold nanoparticles covered with photochromic diarylethene polymers (Au-poly(DE)s) were prepared by Brust’s method, citrate reduction, or a seeding growth method. The diarylethene polymers on the particles exhibited reversible photochromism upon alternating irradiation with ultraviolet and visible ligh…
The emission spectrum of individual single crystalline ZnO nanowires shows three regimes characterized by distinct polarization properties and spatial emission patterns along the length of the wire. In the visible range below 2.9 eV, emission is polarized along the long axis of the wire, along the c-axis (E//c). In th…