Materials Literature
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Abstract Two organically modified (Cloisite® 30B and 10A) and one unmodified clay (Cloisite® Na) were added to a resol‐type phenolic prepolymer. The modified montmorillonites showed a better dispersion in the prepolymer. The dispersion of the clay, the chemical structure as well as the thermal degradation behavior of…
<div class="htmlview paragraph">Beside the fuel consumption reduction the emission reduction is one of the main development objectives. The oncoming increasingly stringent emission limits demand improvements to the emission level especially in the cold start and engine warm-up phase when the catalyst is still in…
Monochromatic cathodoluminescence image of Mn-doped ZnO nanorods shows that Mn elements are mainly distributed on the surface of nanorods. The intensity of ultraviolet luminescence decreases with the increment in Mn-doped concentration. Mn-doped ZnO nanorods exhibit a room temperature ferromagnetic characteristic with…
Highly Co-doped Zn0.7Co0.3O thin films that can be reproducibly grown ferromagnetic by pulsed laser deposition have been investigated by optical absorption and ferromagnetic resonance spectroscopy (FMR). The saturation magnetization depends strongly on the O2 content during the growth, the highest value being obtained…
We report the design and fabrication of a novel electrode‐supported honeycomb solid oxide fuel cell (SOFC), that can generate high volumetric power density. Among various cell designs, honeycomb SOFCs are suitable for compact SOFC modules because they have a large surface electrode area per unit volume. We have succee…
Abstract The addition of SH and OH groups to single‐wall carbon nanotubes (SWCNTs) was investigated employing first principles calculations. In the case of the semiconducting (10, 0) SWCNT the SWCNT‐SH binding energy is weak, 2–4 kcal/mol. However, for the metallic (5, 5) SWCNT it is larger, 7–9 kcal/mol. Thus metalli…
<div class="htmlview paragraph">This paper discusses the poisoning of a selective catalytic reduction (SCR) catalyst by trace levels of platinum originating from an upstream diesel oxidation catalyst (DOC). A diesel aftertreatment system consisting of a DOC, urea based SCR Catalyst and a DPF was aged and evaluat…
The high permittivity of Pb(Zr,Ti)O 3 and (Pb,La)(Zr,Ti)O 3 —PZT and PLZT, respectively—thin films and the flexibility of chemical solution deposition (CSD) make solution‐derived P(L)ZT thin films extremely attractive for integrated capacitor applications. However, Pb‐loss or cation segregation during processing resul…
A thin film (60 μm thick) of a gadolinium‐doped ceria (GDC) electrolyte was prepared by the doctor blade method. This film was laminated with freeze‐dried 42 vol% NiO–58 vol% GDC mixed powder and pressed uniaxially or isostatically under a pressure of 294 MPa. This laminate was cosintered at 1100 °–1500 °C in air for…
A novel realisable dual composite right/left-handed (D-CRLH) coplanar waveguide (CPW) transmission line (TL) in GaAs MMIC technology demonstrated by theoretical analysis and experimental results is presented. A D-CRLH TL is the dual of the conventional CRLH TL in the sense that it consists of series LC parallel tanks…
Manganese is a multifarious element and presents a large variety of behaviors. With the aim of understanding the complex behavior, we performed a systematic study of the magnetic solutions of the manganese dimer as a function of the interatomic distance. The calculation is performed within the framework of an ab initi…
Observation of the room temperature (RT) anomalous Hall effect (AHE) and ferromagnetism in semiconducting like (carrier concentration ∼1019cm−3) Co-doped ZnO samples is reported. These small AHE signals match quantitatively with the magnetic hysteresis and can be correspondent to the intrinsic diluted magnetic oxide (…
Amine-functionalized mesoporous materials were tailored through co-condensation of tetraethoxysilane and n-(2-aminoethyl)-3-aminopropyltrimethoxysilane varied in a range of 0–50 mol% in the presence of cetyltrimethyl ammonium bromide as template. Materials were characterized for textural properties by nitrogen adsorpt…
A simple and reliable technique has been developed to deposit robust monolayers of different types of nanoparticles including gold, iron-platinum, and core/shell CdSe/ZnS, using in situ dithiocarbamate formation.
A frequency-agile hexaferrite-piezoelectric composite for potential device applications at subterahertz frequencies is studied. The bilayer is composed of aluminum substituted barium hexagonal ferrite (BaAl2Fe10O19) and lead zirconate titanate (PZT). A dc electric field applied to PZT results in mechanical deformation…
A pressureless sintering method was utilized to fabricate metal/ceramic joints out of yttria‐stabilized zirconia (3Y‐TZP) and stainless steels (SS). Ultrafine (150 nm) and nanoscale (75 nm) 3Y‐TZP particles and micrometric 17‐4PH, 316L, and 420 SS (<31 μm) powders were tested. Isothermal and nonisothermal sintering be…
Green bodies of porous silicon nitride ceramics were shaped by the extrusion technique using starch simultaneously as binder during extrusion and as pore‐maker during subsequent thermal debinding. The different porosities, microstructures, and mechanical properties after the extrusion, drying, debinding, and sintering…
We analyze the molecular dynamics heterogeneity of the liquid crystal 4-n-octyl-4'-cyanobiphenyl nanoconfined in porous silicon. We show that the temperature dependence of the dynamic correlation length xi_(wall) , which measures the distance over which a memory of the interfacial slowing down of the molecular dynamic…
Phase field micromagnetic microelastic modeling is used to simulate magnetization processes in growth twinned Terfenol-D crystals under external magnetic field applied along the [112¯] growth direction. The simulations reveal complex domain microstructure evolution involving both magnetization rotation and domain wall…
Large magnetic circular dichroism (MCD) in Co-doped ZnO films is reported. The Co-(∼20%) doped ZnO films with oxygen deficiencies show ferromagnetic behavior at room temperature. While paramagnetic films exhibit a small MCD signal, broad MCD spectra with large amplitude of ∼20kdeg∕cm are observed for the ferromagnetic…