Materials Literature
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Porous mullite-bonded SiC (MBSC) ceramics were fabricated at temperatures ranging from 1400 to 1500 o C for 2 h using silicon carbide (SiC), alumina (Al 2 O 3 ), strontium oxide (SrO), and poly (methyl methacrylate-coethylene glycol dimethacrylate) (PMMA) microbeads. The effect of template content on porosity, pore mo…
By using liquid metal cooling method, the Ni-based superalloy DZ125 was directionally solidified under planar interface growth condition of drawing rate of 1.5 μm/s. The microstructures at different solidified fractions were examined by OM and SEM. The results showed that the solid/liquid interface is planar and the m…
Atomic force microscopy and electron microscopy with energy dispersive X-ray analysis was used to characterize changes in the structure and composition of (LSM) nanoparticles supported on single crystal YSZ(100) (yttria-stabilized zirconia) and surfaces as a function of temperature and exposure to oxidizing and reduci…
Analysis of emission characteristics of a nanostructured porous carbon material measured in pulsed electric field demonstrated that their hysteresis complies with two-barrier emission model in the additional assumption that electron transport through the internal barrier is controlled by electric charging of the surfa…
An efficient and improved procedure for the synthesis of benzopyran derivatives has been achieved with Keggin-type and Preyssler-type heteropolyacids (HPA) catalysts in one-pot reaction under solvent-free conditions.
Transmission electron microscopy (TEM) is the main technique used to investigate the spatial distribution of clay platelets in polymer nanocomposites, but it has not often been successfully used in polymer blend nanocomposites because the high contrast between polymer phases impairs the observation of clay platelets.…
In this work, 0-3 lead zirconate titanate (PZT) was mixed with normal Portland cement to produce 0-3 connectivity composites. The effect of temperature on the dielectric properties such as the dielectric constant and dielectric loss was determined. It was found that with increasing PZT content the Tc increases where t…
A microtubular solid oxide fuel cell (SOFC) bundle was developed based on a new design. Anode-supported microtubular SOFCs with the cell configuration, La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)-Ce0.9Gd0.1O1.95 (CGO) cathode/CGO electrolyte/Ni-CGO anode were fabricated and bundled in a porous LSCF current-collecting cube with side…
A small-sized X-ray tube with a carbon nanotube planar field electron emitter has been manufactured and tested. Field electron emitter was grown by the chemical vapor deposition (CVD) method on a nickel substrate. During long time tests (more than 50 hours) the X-ray tube has demonstrated stable characteristics of the…
Water (H 2 O) is often perceived to be a perfectly ordinary substance because it is transparent, odorless, tasteless, and ubiquitous. We interact with it all the time in our everyday lives, and it is, not surprisingly, the most studied material on earth. Unfortunately, we often erroneously think that the properties of…
In recent years, Brazilian Nuclear Programme has been reviewed and updated by government authorities in face of the demand for energy supply and its associated environmental constraints. The immediate impact of new national programmes and projects in nuclear field is the increase in the number of exposed personnel and…
We present the results of a computational study, based on density functional theory, of CO with oxide-supported Ni atom and cluster. Our results reveal effective adsorption sites at the cluster oxide interface and show how the oxide assists the activation of the adsorbed CO.
Abstract The rheological behavior of nanocomposites based on multiwalled carbon nanotube (MWNT) with three commercial grades of ethylene methyl acrylate (EMA) copolymers containing 9, 24, and 30 wt% methyl acrylate (MA) was investigated under dynamic and steady shear flow (in a capillary) conditions. Storage modulus (…
We simulate ABA triblock copolymer melts using a lattice Monte Carlo method, known as cooperative motion algorithm, probing various degrees of compositional asymmetry. Selected order-disorder transition lines are determined in terms of the segment incompatibility, quantified by product χN , and the triblock asymmetry…
We have developed the 8-(m-acetylphenyl)-2'-deoxyguanosine (mAG) scaffold for the self-assembly of supramolecules in water and for the synthesis of self-assembled dendrimers (SADs) in organic media. Previously, reported mAG assemblies showed promising characteristics for the construction of SADs. Yet, none of these SA…
The anisotropic interaction of gold nanoparticles (AuNP's) into a highly accurate, scalable complex structure not only would aid practical nanoscale assembly but also would increase their utility in many applications, including electronics, optics, and biosensing. Particularly for biological purposes, here we demonstr…
Abstract We present a review of photoexcited quasiparticle dynamics of cuprate and pnictide high‐temperature superconductors in regimes (temperature, doping) where different phases such as superconductivity, spin‐density‐wave (SDW) and pseudogap phases coexist or compete with one another. We start with the overdoped c…
본 총설에서는 캐패시터적인 특성을 가지는 다공성 전극의 전기화학특성 분석에 활용되는 임피던스의 복소캐패시턴스 분석법(complex capacitance analysis)의 이론 및 응용에 대해 정리하였다. 이론적으로 캐패시터적인 특성을 갖는 전기화학시스템에 대해 캐패시턴스허수부 도시를 활용하면 효과적인 해석이 가능함이 제시되었다. 또한, 복소캐패시턴스 분석법은 다공성 탄소 재료/전극의 EDLC 특성, 미세기공 내부의 이온전도 특성, 고분자전해질연료전지의 촉매층 이온저항 등의 분석에 효과적으로 적용될 수 있음이 검증되었다. In this review, the theo…
Abstract Novel nanocomposites consisting of genipin cross‐linked chitosan (GC), poly(ethylene glycol) (PEG), and silver nanoparticles were prepared for such biomedical applications as the wound‐healing materials. Various amounts of silver nanoparticles were dispersed in the GC/PEG hydrogel matrix without severe aggreg…
Electrothermal modeling of single-walled carbon nanotube (SWCNT) field-effect transistor (FET) is performed in this paper, with special attention focused on its self-heating effect. The method of finite difference is implemented for solving a 1-D heat conduction equation in the semiconducting channel self-consistently…