Materials Literature
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Abstract Am seidenen Faden : Spinnenseiden haben mechanische Eigenschaften, die jene der meisten natürlichen und synthetischen Fasern übertreffen. Wegen der Komplexität des In‐vivo‐Spinnprozesses scheiterte bislang seine Nachahmung durch klassische Spinnmethoden. Die Analyse des natürlichen Prozesses, kombiniert mit E…
Magnetic ordering can tune optical properties of photoluminescent dilute magnetic semiconductors. The results of a magnetic field dependent photoluminescence (PL) up to 50 T above and below ferromagnetic transition temperature ${T}_{C}$ in Mn-doped ZnS nanocrystals have been reported here. The PL intensity correspondi…
The thermal performance of microelectromechanical systems devices is governed by the structure and composition of the constituent materials as well as the geometrical design. With the continued reduction in the characteristic sizes of these devices, experimental determination of the thermal properties becomes more dif…
The spectroscopic properties of Er 3+ /Yb 3+ co-doped 50SiO 2 –10Al 2 O 3 –20ZnF 2 –20SrF 2 glass and glass ceramic containing SrF 2 nanocrystals were investigated. The formation of SrF 2 nanocrystals in the glass ceramic was confirmed by XRD. The oscillator strengths for several transitions of the Er 3+ ions in the g…
A fabrication process for monolithic integration of vertically aligned carbon nanotubes in electrically insulated microfluidic channels is presented. A 150 nm thick amorphous silicon layer could be used both for anodic bonding of a glass lid to hermetically seal the microfluidic glass channels and for de-charging of t…
A combination of beam-surface-scattering, quartz-crystal-microbalance, and surface-recession experiments was conducted to study the effects of various combinations of O atoms [in the O((3)P) ground state], Ar atoms, and vacuum ultraviolet (VUV) light on fluorinated ethylene-propylene copolymer (FEP) Teflon and poly(me…
Quartz crystal microbalance with dissipation monitoring (QCM-D) was used to study the viscoelastic properties of the blue mussel, Mytilus edulis, foot protein 1 (Mefp-1) adsorbed on modified hydrophobic gold surfaces. The change in viscoelasticity was studied after addition of Cu2+ and Mn2+, which theoretically could…
The crystal structure and magnetic transition were studied for the bulk Mn1.1Fe0.9P0.8Ge0.2 compound prepared by a simple blending and subsequent spark plasma sintering route. X-ray diffraction analysis and refinement show that the compound crystallizes in the hexagonal Fe2P-type structure, in which the Mn atoms occup…
Amorphous carbon thin films are an attractive material because they provide a chemically robust surface that has been utilized in biomolecule array, biosensor, and bioelectronic applications. These thin films are particularly versatile because they are deposited at room temperature, making them readily integrated with…
Abstract Mechanical properties such as tensile and impact strength behavior of teak wood flour (TWF)‐filled high‐density polyethylene (HDPE) composites were evaluated at 0–0.32 volume fraction (Φ f ) of TWF. Tensile modulus and strength initially increased up to Φ f = 0.09, whereas a decrease is observed with further…
Ab initio total-energy calculations, based on the exact muffin-tin orbital method, are used to determine the elastic properties of ${\text{Pd}}_{1\ensuremath{-}x}{\text{Ag}}_{x}$ random alloys in the face-centered-cubic crystallographic phase. The compositional disorder is treated within the coherent-potential approxi…
The effect of disorder and magnetic properties of nanosized Fe2MnAl Heusler alloy has been studied using a combination of x-ray diffraction, F57e Mössbauer spectroscopy, and dc magnetization. X-ray diffraction spectrum of as-milled sample shows texturing in (400) plane. Mössbauer and dc magnetization studies of milled…
We report on the design of a batch microreactor for depositing oxide and chalcogenide nanowires and thin films onto a substrate from solution, and we demonstrate its utility using ZnO nanowire deposition as a case study. A contact-heated substrate forms one wall of a submillimeter reaction channel, and the short mass-…
A fully ab initio scheme based on quantum chemical wavefunction methods is used to investigate the correlated multiorbital electronic structure of a 3d-metal compound, LaCoO 3 . The strong short-range electron correlations, involving both Co and O orbitals, are treated by multireference techniques. The use of effectiv…
High quality ceramics of hexagonal ${\text{InMnO}}_{3}$ were prepared using a high-pressure and high-temperature technique (at 6 GPa and 1373 K). Magnetic properties of ${\text{InMnO}}_{3}$ were investigated using dc and ac magnetizations and specific heat. High-temperature behavior was studied with differential scann…
We fabricate transparent MgAl 2 O 4 nano-ceramics, which are composed of 40 nm grains, by sintering under high pressure and low temperatures. Analysis of the grain size, differential strains, yield strength and porosity obtained from transmission electron microscopy and x-ray diffraction indicates that the pores at th…
Abstract In this study, multiwalled carbon nanotube (MWCNT) and ethylene vinyl acetate copolymer (EVA) nanocomposite bulk foams were prepared for static dissipative applications by using melt compounding method, the most compatible with current industrial applications. Closed‐cell structure was verified with Scanning…
We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling ${J}_{H}$. We find that for sufficiently large ${J}_{H}$, nearly commensurate magnetic fluctuations yield a fully gapped ${s}^{\ifmmode\pm\else\…
We propose an optical wave plate using a metal nano-grid. The wave plate operates in reflection mode. A single-mode truncated modematching theory is presented as a general method to design such nano-grid wave plates with the desired phase difference between the reflected TM and TE polarizations. This analytical theory…
We report systematic density-functional theory calculations of the structure and energetics of ${\text{Au}}_{n}$ nanorows $(n=1--7)$ and clusters $(n=1--12)$ adsorbed on the defected (110) rutile surface. The calculations show that gold nanorows bind strongly to a missing-row defected ${\text{TiO}}_{2}$ surface with a…