Materials Literature
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We report the first observation of single-shot soft x-ray laser induced desorption occurring below the ablation threshold in a thin layer of poly (methyl methacrylate)--PMMA. Irradiated by the focused beam from the Free-electron LASer in Hamburg (FLASH) at 21.7 nm, the samples have been investigated by atomic-force mi…
Abstract This study presents an optimization strategy developed for the stretch‐blow molding process. The method is based on a coupling between the Nelder‐Mead optimization algorithm and finite element (FE) simulations of the forming process developed using ABAQUS®. FE simulations were validated using in situ tests an…
Superlattice-structured ZnO nanohelix is a structure that is made of a coiling nanobelt, which is composed of ZnO nanostripes oriented alternatively in two different orientations (Science 2005, 309, 1700). The nanostripes run almost in parallel to the nanobelt direction but at an offset angle of approximately 5 degree…
In‐plane tensile stress–strain, tensile creep, and after‐creep retained tensile properties of melt‐infiltrated SiC–SiC composites reinforced with different fiber types were evaluated with an emphasis on obtaining simple or first‐order microstructural design guidelines for these in‐plane mechanical properties. Using th…
In order to find relationships among the atomic structure, electronic structure, and defect energetics, $[001](310)\ensuremath{\Sigma}5$ grain boundaries (GBs) of ${\text{SrTiO}}_{3}$ and ${\text{BaTiO}}_{3}$ were investigated by using first-principles calculations and high-resolution scanning transmission electron mi…
The high dewetting abilities of lotus leaves can be transited to a complete wetting state by soaking the leaves in water at a depth of 50 cm for 2 h. However, after being dried by N2 gas, the high dewetting behavior of lotus leaves may be mostly restored. This indicates that experimental procedure might considerably a…
The significant increase in the demand for purified protein for crystallization and structural studies has made necessary the development of multi-sample methods for identifying solution conditions that affect protein stability and aggregation. Conditions that stabilize proteins can improve protein purification and cr…
We study the configuration of magnetic moments on triangular lattices of single-domain ferromagnetic islands, examining the consequences of magnetostatic interactions in this frustrated geometry. By varying the island-island distance along one direction, we are able to tune the ratio of different interactions between…
Both even- and odd-numbered neutral carbon clusters ${\text{C}}_{n}$ $(n=2--10)$ are systematically studied using the energy minimization method and the modified Brenner potential for the carbon-carbon interactions. Many stable configurations were found, and several new isomers are predicted. For the lowest energy sta…
The synthesis of water-soluble near-infrared (NIR)-emitting quantum dots (QDs) in aqueous solution has received much attention recently. However, the stabilizer 3-mercaptopropionic acid, commonly used in the synthesis of NIR-emitting QDs, is notorious for its toxicity and awful odor. Here we chose thiol ligand N -acet…
One-dimensional magnonic crystals have been implemented as gratings of shallow grooves chemically etched into the surface of yttrium-iron garnet films. Scattering of backward volume magnetostatic spin waves from such structures is investigated experimentally and theoretically. Well-defined rejection frequency bands ar…
Magnetic superlattices and nanowires may be described as Heisenberg spin chains of finite length N, where N is the number of magnetic units (films or atoms, respectively). We study antiferromagnetically coupled spins which are also coupled to an external field H (superlattices) or to a ferromagnetic substrate (nanowir…
We investigated the dielectric properties of Pb(Fe1/2Nb1/2)1-xTixO3 single crystals below room temperature. Two dielectric anomalies were detected in sample A while only one was detected in sample B in the temperature range 90~300 K. A Debye-like relaxation with strong frequency dispersion was detected in both samples…
The giant and negative dielectric tunability of Pb(Fe1/2Nb1/2)1-xTixO3 single crystals is reported. A low field of 120 V/cm can induce a great reduction of the capacitance, and the tunability is larger than 80% in low frequency range (<1 MHz) at room temperature. This giant tunability is ascribed to the interfacial po…
Semiconductor quantum dots are tiny light-emitting nanocrystals (2-10 nm) that have captivated researchers in the biomedical field in the last decade. Compared to organic dyes and fluorescent proteins, quantum dots (QDs) have unique optical properties such as tunable emission spectra, improved brightness, superior pho…
Abstract Using a lead zinc niobate (PZN) thin film dielectric, a tunable metal‐insulator‐metal (MIM) capacitor is presented and investigated in this article. To improve its tunability and bias characteristics, the finger patterned electrode in the top metal is devised. The capacitors were fabricated on a low‐resistivi…
We have fabricated single-walled carbon nanotube (SWNT) field effect transistors (FETs) with molybdenum source and drain contacts. Normally, these devices operate only as p-channel transistors, however, after polystyrene latex nanospheres were attached to the nanotubes close to the contacts, they changed to ambipolar…
Using angle-integrated photoemission spectroscopy we have probed the novel ${\text{LaFeAsO}}_{0.9}{\text{F}}_{0.1}$ superconductor over a wide range of photon energies and temperatures. We have provided a full characterization of the orbital character of the valence-band (VB) density of states (DOS) and of the magnitu…
The surface chemistry of vinyl acetate monomer (VAM) on clean and oxygen-covered Pd(100) is explored experimentally in ultrahigh vacuum using reflection absorption infrared spectroscopy (RAIRS), X-ray photoelectron spectroscopy (XPS), and temperature-programmed desorption (TPD), combined with density functional theory…
Abstract Reaction of Na[H 3 Ga‐CH(SiMe 3 ) 2 ] ( 1 ) with the adduct (H 2 O 2 ) 2 · DABCO affords the alkylgallium peroxide Na 4 [(Ga‐R) 3 (O 2 ) 3 (O)] 2 (Et 2 O)(DABCO) ( 2 ) [R = CH(SiMe 3 ) 2 ] by hydrogen release. Compound 2 possesses oxidizing peroxo groups in close proximity to reducing Ga–C bonds and a higher…