Materials Literature
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Polyimide (PI) is widely used in the aerospace and microelectronics industry and engineering due to its excellent electric and mechanical properties; however, the high thermal expansion of the PI causes the problem on the thermal expansion mismatching. A new type of PI with P-Phenylene diamine as diamine monomer is pr…
The influence of mechanical stresses accumulated in the thin films of porous silicon on the photoluminescence from porous silicon was investigated with micro-Raman spectroscopy. Under the 365 nm excitation, dark red photoluminescence was recorded only along the circular boundary of the silicon/porous silicon film. Wit…
Abstract The adsorption properties of Cu, Ag, Ni, and Pd atoms on O 2− , F, and F + sites of MgO, CaO, SrO, and BaO (001) surfaces have been studied by means of density functional calculations. The examined clusters were embedded in the simulated Coulomb fields that closely approximate the Madelung fields of the host…
The effect of polydispersity on nucleation in a metastable mixture of polydisperse polymer A and monodisperse polymer B is studied using self-consistent field theory. We adopt the continuous Schulz chain length distribution to describe the polydispersity of species A. The results show that the free energy barrier, as…
Abstract The preparation of three 2,6‐dipyrazolyl‐4‐X‐anilines, H(pz 2 An X ) (X = p ‐CF 3 , Cl, t Bu) using CuI‐catalyzed amination is described. Subsequent reactions of H(pz 2 An X ) with triphenylboron proceeds with benzene elimination to give the corresponding Ph 2 B(pz 2 An X ) compounds in high yields. The Ph 2…
Yttria-stabilized zirconia (YSZ) nanocrystals (NCs) have been synthesized by a nonhydrolytic sol–gel technique using the alkyl halide elimination reaction between the zirconium and yttrium isopropoxides and zirconium chloride in the oleylamine at 340 ° C . The grain growth behavior during heating of the agglomerated N…
Electronic structures of Mn-doped II-VI diluted magnetic semiconductors (DMSs) were studied by $\text{Mn}\text{ }2p$ core absorption (XAS), $\text{Mn}\text{ }2p$ core-level photoelectron (XPS), and $\text{Mn}\text{ }2p\text{\ensuremath{-}}3d$ resonance photoelectron spectroscopy (RPES). The $\text{Mn}\text{ }2p$ XAS,…
0.995[(K0.50Na0.50)0.94Li0.06]NbO3?0.005AETiO3 (AE=Ca, Sr, Mg, Ba) lead-free piezoelectric ceramics were prepared by normal sintering. The effects of the AETiO3 and poling temperature on the electrical properties of the ceramics were carefully studied, and the temperature stability of the electrical properties of the…
Abstract The Weibull distribution was successfully used to describe the diameter distribution of poly( N ‐isopropylacrylamide‐ co ‐methacrylic Acid (PNIPAAm‐MAA) nanoparticles, whereas the lognormal was deemed not adequate for that purpose. The method of moments was used to predict parameters of the Weibull distributi…
The synthesis of a naphthoquinone amino acid and its electrochemical characterization in a peptide is presented.
ABSTRACT Green asparagus was treated with different coatings (chitosan-beeswax, sodium caseinate-beeswax and SemperfreshTM) and evaluated for changes in fresh weight, sensory attributes, tiprot disorder and texture after a storage period of 14 days at 4C. Chitosan-beeswax significantly reduced fresh weight loss of asp…
This paper deals with the interaction of linear carbon chains (polyynes) with silver and gold surfaces in the form of nanometer-sized clusters. Surface-enhanced Raman signals have been detected revealing remarkable differences in the spectroscopic response between the two metals used for the enhancement. These differe…
This paper reports the preparation of optimal textured structures on silicon surfaces through metal-assisted etching using gold nanoparticles (Au NPs) as catalysts in HF/H 2 O 2 solution. The size and density of the NPs on the Si substrates were readily and rapidly determined using spectroscopic ellipsometry. We obtai…
Abstract Lithium tetraborate crystals have great demand due to its non‐critical phase matching at 90°. Transparent and good optical quality single crystals of undoped and Mn doped Li 2 B 4 O 7 were grown by Czochralski technique in air atmosphere. The crystalline phase was determined by X‐ray diffraction. Doping of Mn…
The high order homogenization technique generates the so called infinite order homogenized equation. Its coefficients were widely discussed in composite mechanics literature because they are closely related to the so called high order strain gradients theories. However, it was not clear what is the correct mathematica…
The frequency of appearance and curvature of zigzag shaped single-walled carbon nanotubes (SWNTs) are tailored by adjusting the gas flow rate, and changing the gas flow direction with respect to the step-edges on a single-crystal quartz substrate. The electrical resistance of SWNTs is found to increase with the number…
Improving the Morphological and Optical Properties of Sputtered Indium Tin Oxide Thin Films by Adopting Ultralow-Pressure Sputtering, Huh, Myung Soo, Yang, Bong Seop, Song, Jaewon, Heo, Jaeyeong, Won, Seok-Jun, Jeong, Jae Kyeong, Hwang, Cheol Seong, Kim, Hyeong Joon
Abstract Thermoplastic elastomers (TPEs) based on dynamically cured epoxidized natural rubber/high‐density polyethylene (ENR/HDPE) blends were prepared. Influence of the process oil, blend proportion, and curing systems were investigated. It was found that the oil‐extended thermoplastic vulcanizates (TPVs) exhibited b…
The systematic pressure shifts of ${T}_{c}$ were investigated in the whole phase diagram of the FeAs-based superconducting compound ${\text{K}}_{x}{\text{Sr}}_{1\ensuremath{-}x}{\text{Fe}}_{2}{\text{As}}_{2}$. Different regions, arising from corresponding responses of ${T}_{c}$ to pressure ($d{T}_{c}/dp>0$, $\ensur…
Abstract This study was divided into two sections. In the first part, we used ultraviolet (UV) rays in the wavelength range 300–400 nm to remove the hydrogen atom from polyethylene (PE) and worked with a hydrophilic monomer to complete the grafting action. In the second part, we used the best conditions derived from t…