Materials Literature
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Abstract The high‐density polyethylene/carbon black (HDPE/CB) composite with a CB volume fraction of 0.113 is isothermally annealed at various temperatures from 116 to 149°C, covering the positive temperature coefficient (PTC) transition and the negative temperature coefficient regions during heating as well as from 1…
Ferrite/ferroelectric films are of interest as they afford dual tunability of the permeability and permittivity using magnetic and electric fields. We have grown bilayered thin films of ferrimagnetic BaFe12O19 (BaM) and ferroelectric Ba0.5Sr0.5TiO3 (BST) on A-oriented polished sapphire substrates using pulsed laser de…
Recombination dynamics of excitons in Mg0.11Zn0.89O epilayers grown by laser-assisted molecular-beam epitaxy on a ScAlMgO4 substrate were investigated. By using the MgZnO high-temperature-annealed self-buffer layer (HITAB), the value of full width at half maximum of the near-band-edge (NBE) photoluminescence (PL) peak…
Microphotoluminescence (μ-PL) of high-aspect-ratio Si nanopillars fabricated by etching Ni-nanodot∕SiO2 masked Si substrate is investigated. The 320-nm-tall Si nanopillars obtained by CF4∕Ar mixed inductively coupled-plasma reactive ion etching process with density of 2.8×1010cm−2 further shrink size from 30to6nm by o…
Abstract Cobalt‐substituted lithium ferrites (with general composition Li 0.5– x /2 Co x Fe 2.5– x /2 O 4 , where x = 0.0, 0.2, 0.4, 0.5 and 0.6) were prepared at lower processing temperatures (∼600 °C) by the citrate route. The single‐phase spinel structure was confirmed by X‐ray diffraction. The average particle siz…
Abstract Poly(2‐hydroxyethyl methacrylate)‐ block ‐poly( N ‐isopropylacrylamide) (PHEMA‐ b ‐PNIPAM) was prepared by controlled surface‐initiated ATRP from silicon substrates, and the resulting block copolymers were successfully converted into the corresponding PSEMA‐ b ‐PNIPAM by esterification of the hydroxy groups o…
A fundamental understanding of the role of catalysts in improving the kinetics and thermodynamics of hydrogen sorption in NaAlH4 is the key for using this material in hydrogen storage. The authors present a systematic theoretical study of energies needed to desorb hydrogen in 3d transition metal (Sc–Cu)-doped NaAlH4.…
Abstract Homogeneous surface coating of multi‐walled carbon nanotubes is achieved for the first time by in situ copolymerization of ethylene (E) and 2‐norbornene (N) as catalyzed directly from the nanotube surface previously treated by a highly active metallocene‐based complex, i.e., rac ‐Et(Ind) 2 ZrCl 2 /MMAO‐3A. Th…
The authors investigate the magnetic and transport behaviors of Ge1−xMnxTe thin films with high Mn composition (x=0.98) grown by solid-source molecular-beam epitaxy. The temperature-dependent magnetization (M-T) gives a Curie paramagnetic temperature θp∼120K, in contrast to the Curie temperature of TC∼95K obtained fro…
We study the band structures of one-dimensional (1D) photonic crystals (PCs) in the subwavelength limit. A "spatial-averaged single-negative" (SASN) gap whose edges correspond to zero (volume) averaged permittivity (epsilon=0) and zero (volume) averaged permeability (micro=0) will appear when metamaterial is included…
The authors have demonstrated highly collimated electron-beam emission from a practical electron gun with a single-atom electron source; ∼80% of the total emission current entered the electron optics. This ratio was two or three orders of magnitude higher than those of the conventional electron sources such as a cold…
High quality Ba(Zr0.2Ti0.8)O3 (BZT) thin films were epitaxially grown on MgO single-crystal substrates. No structural phase transition took place in the temperature range of 80–300K, and the films displayed a typical behavior of relaxor ferroelectrics, which was demonstrated by micro-Raman spectroscopy. Frequency and…
Radioactive cadmium telluride/zinc sulfide (Cd 125 m Te / ZnS) nanoparticles were targeted to mouse lung with antibody to mouse lung endothelium and quantified using radiological histology in order to test the in vivo targeting efficacy of a nanoparticle–antibody (NP–mAb) system. The nanoparticles were linked to eithe…
Abstract ZnO has gained interest in part because of its large exciton binding energy (60 meV), good for lasing with low threshold. The renewed interest in ZnO is fuelled by availability of high quality substrates, reports of p‐type conductivity, and ferromagnetic behavior when doped with transitions metals. The field…
A varistic nonlinear I-V characteristic caused by a tunneling effect was observed in two-dimensional nanopolycrystal ZnO (NPC-ZnO) with double Schottky barriers (DSBs). Id-Vd characteristic of a NPC-ZnO field effect transistor showed a negative differential resistance characteristic at room temperature. The Id-Vg show…
Abstract The four kinds of boron‐containing coupling agents were synthesized, which were applied to improve the interfacial bonding of fluoropolymer/1,3,5‐triamino‐2,4,6‐trinitrobenze (TATB) composite. The boron atom of the coupling agent molecule can form coordinate bond with the fluorine atom of fluoropolymer; and h…
Abstract A series of Poly(imide siloxane) (PIS)/silica (SiO 2 ) hybrid nanocomposites with C‐Si covalent bonding between the homogeneous PIS copolymer and SiO 2 have been successfully synthesized. The PIS copolymer synthesized in this study is characterized by the coexistence of two segments: the polyimide segment and…
Abstract Synthesis and characterization of ferrocene‐containing main‐chain polyamides are reported in this article. A new, interesting type of organometallic monomer (FDADO) based on ferrocene was prepared by interfacial condensation of 1,1′‐dichlorocarbonyl ferrocene with 2 mol 1,8‐diamino‐3,6‐dioxaoctane (DADO). A s…
It has been proposed that surface and interface stresses can modify the elastic behavior in nanomaterials such as nanowires. The authors show that surface stresses modify the tensile response of nanowires only when nonlinear elastic effects become important leading to cross terms between the applied stress and the sur…
Epitaxial Ba0.3Sr0.7TiO3 (BST) films with significantly improved tunable performance were grown on c-plane sapphire [Al2O3(0001)] substrates using ultrathin TiN seed layers by pulsed laser deposition. A very thin (111) epitaxial TiN layer deposited at room temperature acted as a sacrificial epitaxial template for the…