Materials Literature
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ABSTRACT This study focused on the crack‐healing behaviour of three commercial Al 2 O 3 –ceramic‐matrix composites: TiC P /Al 2 O 3 , ZrO 2 /Al 2 O 3 and SiC W /Al 2 O 3 . Vickers indentation was used to introduce surface flaws with different loads of 49, 98 and 196 N. Then the cracked specimens were annealed in air f…
Abstract The primary objective of this study was to improve montmorillonite clay‐platelet separation in vinyl ester resin matrix by organically modifying the nanoclay platelet with a partially reactive onium salt. The reactive onium salt (ω‐undecylenyl amine hydrochloride) was synthesized from commercial ω‐undecylenyl…
Human trichloroacetic acid–soluble protein p14.5 (hp14.5) is a member of the large YjgF/YER057c/UK114 protein family, which comprises approximately 200 members,1 most with unclear biological function. The hp14.5 homologs belonging to the high-identity (>38%) group (approximately 80 proteins) share 9 completely invaria…
Large quantities of high-quality double-walled carbon nanotubes (DWNTs) with very small amounts of amorphous carbon deposits have been produced by catalytic decomposition of n -hexane over Fe−Mo/MgO catalyst. More than 90% of the as-synthesized carbon nanotubes was DWNTs. Raman analysis indicated that the outer tube d…
Electron-spin resonance has been studied in a stoichiometric single crystal of ${\mathrm{LaMnO}}_{3}$ in the temperature range of 4.2 K--250 K. ${\mathrm{LaMnO}}_{3}$ exhibits an extensively studied antiferromagnetic (AF) transition at ${T}_{N}=141\mathrm{K}.$ The spin resonance was detected both in a fixed-frequency…
We report the design and synthesis of well-defined polymers for the noncovalent oligomerization of proteins. The reported scaffolds, which were generated by atom-transfer radical polymerization (ATRP), take advantage of the well-characterized interaction between a Ni2+ complex and an oligohistidine sequence (His tag).…
Traditional sorting diagrams for ground states $(T=0$ stable atomic configurations) of bcc-based binary alloys predict simple crystal structures when simple parametric interactions (e.g., first few pairs) are assumed. However, the range and magnitude of interactions for real systems is not a priori known, and could le…
Structural and magnetic properties of nanocrystalline compounds of the general formula ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{MnO}}_{3+\ensuremath{\delta}}$ have been investigated combining x-ray diffraction and x-ray absorption spectroscopy in order to achieve an accurate description of the sample atomic structure…
Detailed studies of both ${}^{55}\mathrm{Mn}$ NMR spectra and nuclear relaxation, completed by magnetic measurements, have been performed to obtain microscopic information on the magnetic structure of fine scale (\ensuremath{\sim}50 and \ensuremath{\sim}100--200 nm) particles of ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}…
Ag + /ZSM-5 catalysts were prepared by an ion-exchange method and characterized by in-situ XPS, XAFS (XANES and EXAFS), UV−Vis, photoluminescence, and FT-IR investigations. These Ag + /ZSM-5 catalysts were found to exhibit an UV absorption band at around 190 nm due to the isolated Ag + ions. The addition of N 2 O mole…
The importance of newly developed permanent magnetic materials in many electromechanical, magnetomechanical and electronic applications is attributed to the drastic improvement in microstructure related properties, such as the remanence, the magnetic energy density product and the coercive field. The influence of the…
We have investigated the low-temperature T field-induced ordering in ${\mathrm{NiCl}}_{2}\ensuremath{\cdot}4\mathrm{SC}({\mathrm{NH}}_{2}{)}_{2},$ from magnetization measurements. This is an $S=1$ system with a large single-ion uniaxial anisotropy leaving a singlet ground state. An external magnetic field $(\mathbf{B}…
ABSTRACT Fatigue tests up to 10 8 cycles were carried out for two spring steels (Heats A and D1) and one valve spring steel (Heat F) with tensile strength, σ B , of 1720, 1725 and 1764 MPa, respectively. The size and composition of inclusions in Heats Dl and F were controlled. The surface‐type fracture occurred at sho…
In this study, we present evidence for the existence of a molecularly chemisorbed oxygen species on a Au/TiO2 model catalyst and a Au(111) single crystal following exposure of these samples to an oxygen plasma-jet molecular beam. We present evidence for the molecularly chemisorbed oxygen species from thermal desorptio…
The dynamics of coalescence of two water sessile drops is investigated and compared with the spreading dynamics of a single drop in partially wetting regime. The composite drop formed due to coalescence relaxes exponentially toward equilibrium with a typical relaxation time that decreases with contact angle. The relax…
Waste biomass material in the form of natural fibres used in the production of textile products were examined for their potential to produce activated carbon by physical activation. The five biomass types were hemp, flax, jute, coir and abaca. Each biomass was pyrolysed in a fixed bed reactor and the char characterize…
Abstract The linear and star‐shaped poly(L‐lactic acid) (PLLA) with similar molecular weight were prepared and their physical properties such as thermal properties, rheological properties, and crystallization behavior in quiescent and dynamic states were compared. The differential scanning calorimetry showed that the…
In this paper, we propose two new approaches for preparing active substrates for surface-enhanced Raman scattering (SERS). In the first approach (method 1), one transfers AgI nanoparticles capped by negatively charged mercaptoacetic acid from a AgI colloid solution onto a quartz slide and then deoxidizes AgI to Ag nan…
Herein, we report on the ability to create complex 2-D and 3-D silica networks in vitro via polycationic peptide-mediated biosilicification under experimentally altered chemical and physical influences. These structures differ from the sphere-like silica network of particles obtained in vitro under static conditions.…
The simultaneous encapsulation of both luminescent semiconductor and magnetic oxide nanoparticles in polymer microcapsules is demonstrated for the first time. Highly luminescent CdTe semiconductor nanocrystals serve as luminescent markers, while magnetic Fe3O4 nanoparticles allow external manipulation of the capsules…