Materials Literature
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POMs, Magnete und Co: Das tetramere 36-Wolframato-8-Phosphat [{Co4(OH)3PO4}4(PW9O34)4]28− mit 16 Cobalt(II)-Zentren wurde in einer einfachen Eintopfreaktion hergestellt. Die {Co16(OH)12(PO4)4}8+-Kernstruktur (siehe Bild) zeigt Eigenschaften eines Einzelmolekülmagneten.
The impact of various ZnO templates on the alignment and geometry of wet-chemically grown vertical ZnO nanowire (NW) arrays was investigated. The NWs were seeded at nucleation windows which were patterned in poly(methyl methacrylate)-coated ZnO surfaces using electron beam lithography. This growth approach was shown t…
Using molecular dynamics simulations, we study axial compressive behavior of single-walled carbon nanotubes (SWCNTs) with a wide range of aspect ratios (length to diameter ratio). It is shown that the difference in aspect ratio leads to distinct buckling modes in SWCNTs. Small-aspect-ratio SWCNTs primarily exhibit she…
Grain boundary engineering represents a prospective tool for producing high performance structural and functional materials, including super-strong nanocrystalline materials. There remains a fundamental challenge to experimentally evaluate the inherent strength of grain boundaries providing a higher limit for the stre…
A simple route for the fabrication of a highly ordered surface pattern consisting of reduced graphene oxide (RG-O) platelets is developed, in which RG-O platelets modified with poly(ionic liquid) (PIL) undergo a spontaneous self-assembly process as a result of the controlled solvent evaporation.
An achiral nematic liquid crystal was doped with a small quantity of carbon nanotubes having a net chirality, and the mixture was found to exhibit an average mechanical twist over macroscopic dimensions. The nanotube-induced chiral pitch length P was determined as a function of the average nanotube concentration by me…
We demonstrate the use of binary colloidal assemblies as lithographic masks to generate tunable Au patterns on SiO(2) substrates with dimensions ranging from micrometers to nanometers. Such patterns can be modified with different chemistries to create patterns with well-defined sites for selective adsorption of protei…
The shape of monolayer-protected Au38 clusters on the sub-nanometer scale is obtained by spherical aberration-corrected scanning transmission electron microscopy under optimized experimental imaging conditions. The cluster shape is generally retained between frames, and statistical analysis of the shape population id…
Interest in the magnetic properties of the ordered equiatomic alloy FeRh has been revived in recent years due to potential applications in heat assisted magnetic recording. This is based on the existence of a first order hysteretic phase transition from strongly anisotropic antiferromagnet (AF) to relatively isotropic…
Magnetoelectric effect in composite materials results from the combination of piezoelectric and magnetostrictive effects. This paper focuses on the development of a harmonic finite element formulation for such coupled problems, taking into account the nonlinearity of magnetostrictive behavior. An application to a magn…
We validate for the first time the phenomenological phonon confinement model (PCM) of H. Richter, Z. P. Wang, and L. Ley [Solid State Commun. 39, 625 (1981)] for silicon nanostructures on the sub-3 nm length scale. By invoking a PCM that incorporates the measured size distribution, as determined from cross-sectional t…
Raman spectra of monolayer graphene at various temperatures (303–473 K) are measured. In Raman scattering with wave numbers ranging from 1200 to 3400 cm −1 , the four main Raman peaks (G, 2D, T + D and 2D′) show temperature-dependent behaviour, but have different frequency shifts with increase in temperature. We propo…
Abstract Multiwalled carbon nanotubes (MWCNTs) are grafted with 2‐vinylpyridine (VP) by using N 2 plasma technique. The VP grafted MWCNTs (MWCNT‐ g ‐VP) are characterized by using X‐ray diffraction, X‐ray photoelectron spectroscopy, and thermo‐gravimetric analysis‐differential thermal analysis. The application of MWCN…
Dysprosium-added sintered magnets were prepared from blends of Nd15.5(Fe,Co,Ga)78.2B6.3 and Dy2S3 powders; their microstructure and magnetic properties were compared to those of the magnets made with Dy2O3 additions or from single (Nd,Dy)-(Fe,Co,Ga)-B alloys. The addition of Dy2S3 leads to replacement of the neodymium…
The structures and electronic features of five complex multiphotochromic molecules incorporating two or three diarylethene units are investigated with quantum mechanical approaches. Four out of the five systems only display partial photochromism, and it is shown that the interplay between steric and electronic effects…
Stronger magnetic moment with fewer electrons: An α-Keggin-type {Mn13} single-molecule magnet (SMM) was synthesized and subsequently oxidized (see picture); its one- and two-electron-oxidized derivatives could be isolated. The spin ground states of the more oxidized species are higher despite the electron loss, result…
The influence of Ar+ implantation induced disordering in the surface layers of the CR-39 polymer on its optical properties and surface hardness has been studied. The specimens were implanted at 130 keV to the doses of 5 × 1014, 1 × 1015, 1 × 1016 Ar+ cm−2. The structural behavior of the pre- and postimplanted specimen…
We report on the structural and magnetic properties of crystalline bi-phase Co nanowires, electrodeposited into the pores of anodized alumina membranes, as a function of their length. Co nanowires present two different coexistent crystalline structures (fcc and hcp) that can be controlled by the time of pulsed electro…
We report a method of obtaining controllable spatially varying liquid crystal pretilt angles using a stacked alignment layer. The stacked alignment layer consists of nano-domains of horizontal and vertical alignment materials. The pretilt angle is controlled by varying the domain ratio of the two layers. By using phot…
The inhibitive effect of the hexamethylenediamine tetra(methylene phosphonic acid) (HMDTMPA) on the corrosion of carbon steel in 1.0 M HCl solution has been investigated by weight loss measurement, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The presence of (HMDTMPA) reduc…