Materials Literature
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Thin films of various organic materials have been deposited by Matrix Assisted Pulsed Laser Evaporation (MAPLE) technique. The principles, advantages, and difficulties of deposition technology are discussed. The focus is on target preparation, solvents, studied materials, growth rate and films properties characterizat…
The magnetic and magnetocaloric properties of the intermetallic compounds Tb1-xTmxCo2 (with x = 0, 0.2 and 0.5) have been studied. It is found that partial replacement of Tb by Tm in TbCo2 leads to a reduction in the ordering temperature, which is attributed to the decrease in the exchange strength due to the lower sp…
The critical phase transition temperatures of the ferroelectric (FE) phase and the ferromagnetic (FM) phase in epitaxial 1–3 type multiferroic thin films were obtained based on the thermodynamic model. Analytic expressions of the para–ferro transition temperatures were derived as functions of the volume fraction of th…
Summary Clay–Al hydroxide polymer systems (CAlHO) can bind heavy metals effectively. Their adsorption behaviour depends on the type of metal. We studied the dependence of Al‐loading and pH on the adsorption of Pb to Na‐saturated montmorillonite–Al hydroxide polymer systems. The available binding sites on the Al hydrox…
Abstract A series of superabsorbent composite, polyacrylamide/attapulgite, from acrylamide (AM) and ion‐exchanged attapulgite (APT) was prepared by aqueous polymerization, using N,N′ ‐methylenebisacrylamide (MBA) as a crosslinker and ammonium persulfate (APS) as an initiator. The effects of ion‐exchanged APT on water…
A layered ternary carbide phase, Ti 3 AlC 2 , was synthesized by hot pressing from the starting materials of Ti, aluminum, and activated carbon at 1400°C for 2 h. Its composites were also fabricated through addition of micro‐sized SiC and partially stabilized zirconia particulates to the pulverized Ti 3 AlC 2 powders.…
The Heusler compound Co2FeSi is a promising material for magneto-electronic devices. With a Curie temperature of 1100?K and a saturation magnetization of 6?Bohr magnetons and a high spin polarization at the Fermi edge it fulfils the essential requirements for magnetic sensors or spin valve structures. An essential fea…
A versatile method is disclosed for solid-phase peptide synthesis (SPPS) of molecular imaging contrast agents. A DO3A moiety was derivatized to introduce a CBZ-protected amino group and then coupled to a polymeric support. CBZ cleavage with Et2AlCl/thioanisole was optimized for SPPS. Amino acids were then coupled to t…
We have studied the growth temperature dependence of the interfacial reaction of Heusler-alloy Co 2 FeSi/GaAs(0 0 1) hybrid structures. The reaction proceeds dominantly by Co in-diffusion, resulting in the formation of isolated grains in the GaAs substrate starting at the growth temperature T G of 200–250 °C. The inte…
In this paper we report in situ small-angle neutron scattering results on the high-density amorphous (HDA) and low-density amorphous (LDA) ice structures and on intermediate structures as found during the temperature-induced transformation of HDA into LDA. We show that the small-angle signal is characterized by two Q…
The peculiar properties of graphene, which is neither semiconductor nor metal, may allow its electrons to be focused like light.
Schrumpfende Kapseln: Der gerichtete Verlauf der DNA-Hybridisierung wurde genutzt, um DNA-Kapseln mit einstellbaren Schrumpfeigenschaften zu erhalten (siehe Bild). Das Ausmaß des Schrumpfens liegt je nach verwendeter Oligonucleotidsequenz bei 35–90 % des ursprünglichen Partikelvolumens. Diese Kapseln könnten Verwendun…
Stromschalter: Nanodrähte des organischen Halbleiters Kupfer-Tetracyanchinodimethan (Cu-TCNQ) wurden durch Abscheidung aus der Gasphase auf eine Vielzahl an Substraten in Mustern aufgebracht. Eine Kreuzungspunkt-Speichereinheit aus einem Netz von Cu-TCNQ-Nanodrähten (siehe Bild) schaltet wiederholt elektrisch zwischen…
A modified solution process is used to produce super-paramagnetic nanocomposite particles containing functional groups for adsorption application. The powder is produced in a spray tower. The feed is a polymer solution containing two fractions of different particles: magnetite (14 nm) and polymer ion exchanger (150 nm…
Abstract We report the syntheses of the dimeric homonuclear Pcs 9a and 9b and of the dimeric heteronuclear Pc 9c , starting from the unsymmetrical phthalocyanines 7a and 7b , each containing a phenolic OH group in one of its substituents. Compounds 9a and 9b were obtained by single‐step alkylations of 7a and 7b with 1…
We analyse the equilibrium dynamics of kinetically constrained spin systems which have been proposed as models for strong or fragile glasses and systems undergoing jamming transitions. We develop a novel multi-scale approach which allows us to connect the timescales to the typical size of the regions which have to be…
The manganese(III)-bis[poly(pyrazolyl)borate] complexes, Mn(pzb)2SbF6, where pzb- = tetrakis(pyrazolyl)borate (pzTp) (1), hydrotris(pyrazolyl)borate (Tp) (2), or hydrotris(3,5-dimethylpyrazolyl)borate (Tp*) (3), have been synthesized by oxidation of the corresponding Mn(pzb)2 compounds with NOSbF6. The Mn(III) complex…
The quarternary substitutional series Co2Cr1?xFexAl was investigated by means of surface and bulk sensitive techniques in order to exploit its structural and compositional properties. Both bulk and powder samples of the alloy series were investigated to obtain specific information about this material.The long range or…
Element-specific magnetic properties of ultrathin epitaxial Co2FeSi(110) films were measured using x-ray magnetic circular dichroism (XMCD). The epitaxial Heusler films were grown by RF magnetron sputtering on substrates. The magnetization of thicker films as determined by XMCD is smaller than expected for a half-meta…
The scheelite-type $\mathrm{Y}\mathrm{Cr}{\mathrm{O}}_{4}$ with space group $I{4}_{1}∕a$ was synthesized at $6.0\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and $450\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ from its ambient-pressure zircon-type phase in $I{4}_{1}∕amd$ symmetry. Accompanying…