Materials Literature
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Self- assembly of biological molecules forms the basic principle in the formation of complex biological structures. Numerous proteins and peptides have been emerging as nanobiomaterials due to their ability to self-assemble into nanoscale structures like nanotubes, nanovesicles, helical ribbons and three dimensional f…
This work reports the effect of hydrogen concentration on the amino group introduction by the plasma treatment of the polyethylene surface. The amino group selectivity on the polyethylene sheet treated by the surface-wave plasma in various N2/H2 gas mixtures was examined by chemical derivatization combined with x-ray…
We present a model for describing electrical properties of an electrochemically controlled heterojunction between a conducting polymer (polyaniline) and a solid electrolyte (lithium salt doped polyethylene oxide). In particular, the difference in the kinetics of the conductivity variation for different polarities of t…
A phase change memory device, consisting of Ge 2 Sb 2 Te 5 chalcogenide, a Mo electrode and a SiO 2 dielectric layer, was fabricated in order to investigate the failure mechanism. During the pulsed mode switching of the device with a reset pulse (5.0 V, 90 ns) and a set pulse (1.5 V, 30 µs), some devices failed to res…
Titanium oxide films were prepared by RF magnetron sputtering onto glass substrates. The effects of RF power and deposition temperature on crystalline structure, morphology and energy gap were investigated, which were analyzed by X-ray diffraction, SEM and UV-Vis spectrometer, respectively. Results show that rutile ph…
The Mn doping effects on the electric and dielectric properties of ZnO epitaxial films were studied. To optimize the stoichiometry of undoped ZnO film prepared by pulsed laser deposition, we evaluated the intensity ratio of the optical emission from excited oxygen atoms (O*) and excited zinc atoms (Zn*) generated by a…
Nondoped potassium niobate (KNbO 3 ) ceramics were synthesized with fine powders obtained by a hydrothermal method. The hydrothermal method employs a chemical reaction in a solution. Low reaction temperature and self-assembly growth resulted in high-quality KNbO 3 powders. In this study, various temperature conditions…
The development of a head-end processing step for spent oxide fuel that applies to both aqueous and pyrometallurgical technologies is being performed by the Idaho National Laboratory, the Oak Ridge National Laboratory, and the Korean Atomic Energy Research Institute through a joint International Nuclear Energy Researc…
Near-infrared luminescence is observed from bismuth-doped GeS 2 —Ga 2 S 3 chalcogenide glasses excited by an 808 nm laser diode. The emission peak with a maximum at about 1260 nm is observed in 80GeS 2 -20Ga 2 S 3 :0.5Bi glass and it shifts toward the long wavelength with the addition of Bi gradually. The full width o…
N-ZnO/p-Si heterojunctions are prepared by sputtering deposition of intrinsic ZnO films on p-Si substrates. Thicknesses of ZnO films are altered by varying the deposition time from 1 h to 3 h. The electrical properties of these structures are analysed from capacitance-voltage (C-V) and current-voltage (I-V) characteri…
A novel method is described for the preparation of nearly monodispersed and highly magnetic responsive microspheres with magnetite nanocrystals formed in a polymeric matrix by hydrothermal reduction. The method is based on the formation of iron hydroxide/polymer composite microspheres by acid-catalyzed condensation po…
A series of novel symmetrical and unsymmetrical triphenylene‐based discotic liquid crystalline materials with one or six branched peripheral alkoxy chains have been prepared. These materials have been compared with analogous known symmetrical and unsymmetrical compounds to reveal a balance between steric and space‐fil…
Nd and Mn were codoped into ZnO films which have been grown on a-plane sapphire substrates by pulsed laser deposition with the thickness ranging between 46 and 971 nm. The room temperature resistivity of the codoped films is independent of film thickness. Large positive magnetoresistance and clear anomalous Hall effec…
The Raman spectra of the ethylene-propylene copolymers (EPC) synthesized using new metallocene catalytic systems and the polypropylene/polyethylene/diblockcopolymer of propylene and ethylene (PP/PE/DBC) blends obtained using the sequential polymerization are studied. The copolymer and reactor blend spectra are analyze…
High resolution electron energy loss spectroscopy (HREELS) is a powerful method for the study of vibrational and electronic excitations at solid surfaces and has been extensively applied to metal single crystal surfaces. As a result of experimental difficulties, unfortunately, much less information is available on ads…
Although the industrial development of complex metallic alloys (CMAs) and quasicrystals (QCs) has remained quite limited so far, these materials exhibit interesting and sometimes unexpected properties in terms of technological applications. A few selected examples of the most promising properties and trends for potent…
Abstract Heterotrinuclear [(NiIIL)2LnIII(NO3)] complexes (where H3L = 1,1,1-tris[(salicylideneamino)methyl]ethane and Ln = Gd (1), Eu (2), Tb (3), and Dy (4)) were prepared by treating [Ni(H1.5L)]Cl0.5 with Ln(NO3)3·6H2O in the presence of triethylamine. Complexes 1·2CH3OH, 3·2CH3OH, and 4·C2H5OH·0.5H2O crystallized i…
X‐ray diffraction (XRD) and electron microscopy investigations have been performed on Sc 2 O 3 ‐stabilized ZrO 2 as‐sintered and after aging in air or in wet‐forming gas at 850°C for 1000 h. Some tetragonal to monoclinic transformation had occurred in the near‐surface regions of 4 mol% Sc 2 O 3 samples after aging; th…
Application of a magnetic field offers an incisive opportunity to tune competing interactions in complex materials. Here we probe field-induced changes in the local structure of DyMn2O5 by using magnetoinfrared spectroscopy. The high tunability of the dielectric constant and ferroelectric polarization with field is we…
The electrical conductivity of nanoporous gold was measured in situ during the charging and decharging of the surface of the metal. The nanoporous gold samples were prepared by the process of selective dealloying of Ag from Au–Ag alloy. Charge was induced on the surface by making the sample a working electrode in an e…