Encapsulation of gases in the solid state
A hemicarcerand encapsulates, stores and releases gases in the solid state.
Materials Literature
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The NaNO3/KNO3 system: the position of the solidus and sub-solidus
The existing evidence for the nature of the phase diagram for the binary system sodium nitrate-potassium nitrate is reviewed and in particular whether the system is of the continuous solid solution type, as has often been stated in the last 80 years, or whether this system is of the eutectic type as was earlier believ…
Synthesis of indaphyrins: meso-tetraarylsecochlorin-based porphyrinoids containing direct o-phenyl-to-β-linkages
The synthesis of indaphyrins, novel meso-tetraarylsecochlorin-derived chromophores incorporating o-phenyl-to-beta-linkages, is described. Oxidative diol cleavage of meso-tetraaryl-2,3-dihydroxy-2,3-chlorins results in the formation of a secochlorin bisaldehyde. Depending on the reaction conditions during the ring clea…
Acetylation of natural fibers to improve performance
One of the advantages of using natural fibers in composites is that they are biodegradable and renewable. Many applications for composites, however, require high performance and durability. While our attention is being drawn to renewable, biodegradable and sustainable resources for materials, we are faced with the con…
Thermal properties of metastable ices IV and XII: comparison, isotope effects and relative stabilities
Pure samples of H2O (D2O) ice IV and of H2O (D2O) ice XII were prepared by isobaric heating of high-density amorphous ice at a rate of ≈0.5 K min−1 up to ≈175 K and a pressure of 0.81 GPa for ice IV, and at a heating rate of ≈12 K min−1 and a pressure of 1.21 GPa for ice XII. The crystalline phases recovered at 77 K a…
Surface properties of CeO2 from first principles
The surface energies and electronic structure of (111), (110), and (100) surfaces of CeO2 have been studied using the first-principles projector augmented-wave method within the local density approximation (LDA) and generalized gradient approximation (GGA) and are compared with molecular dynamics (MD) simulations at 1…
Effect of Tensile Stress on Growth of Self-Organized Nanostructures on Anodized Aluminum
The effect of an applied tensile stress on the pore ordering during anodization of aluminum was studied. A regular arrangement of nanopores was observed at a relatively low external tensile stress. On the contrary, a high tensile stress completely destroys the pore arrangement on anodized surfaces. Under such conditio…
First lanthanide dipolar complexes for second-order nonlinear optics
New push-pull NLO-phores based on lanthanide complexes (Ln = La, Gd, Dy, Yb) featuring an annelated dibutylaminophenyl functionalised terpyridyl ligand have been synthesised and shown to exhibit large first-order hyperpolarizability.
Electrochemical Capacitors Based on Exfoliated Graphite Electrodes
Exfoliated graphite (EG) is proposed as an electrode material for solid-state electrochemical capacitors. The EG-based capacitors assembled with a solid electrolyte of polyethylene oxide-ethylene carbonate-propylene carbonate- show high specific capacitance in the range of The capacitors also show excellent cyclabilit…
Atomistic Model Potential for PbTiO3and PMN by Fitting First Principles Results
We have developed a shell model potential to describe PbTiO3 and PbMg1/3Nb2/3O3 (PMN) by fitting to first-principles results. At zero pressure, the model reproduces the temperature behavior of PbTiO3, but with a smaller transition temperature than experimentally observed. We then fit a shell model potential for the co…
Improvement of the catalytic performance of CuMnOx catalysts for CO oxidation by the addition of Au
Highly active Au-containing hopcalite catalysts for ambient temperature CO oxidation have been prepared by a co-precipitation procedure. The addition of Au to the CuO–MnO system resulted in a marked improvement in the catalytic performance, by increasing the rate of CO oxidation and decreasing the extent of catalyst d…
Giant magnetoelectric effect in composite materials in the region of electromechanical resonance
The magnetoelectric effect in multilayer ferrite-piezoelectric composites has been theoretically and experimentally studied. Using the method of effective parameters, an expression for the magnetoelectric coefficient is determined and its frequency dependence is analyzed. It is shown that, in the region of electromech…
Tensile Behavior and Cold Workability of Ti-Mo Alloys
Three kinds of titanium-molybdenum alloy, Ti-8Mo, Ti-14Mo and Ti-20Mo (mass%), quenched from 1223 K were investigated to clarify the tensile behavior and the cold workability using tensile test and conical cup test. In the quenched state Ti-14Mo showed the superior workability. Ti-20Mo has poor ductility in tensile te…
Supercapacitors Prepared from Carbon Nanofibers Electrospun from Polybenzimidazol
A new form of carbon nanofiber web was prepared that is considered to be a suitable material for the electrode of a supercapacitor exhibiting high capacitance. A polybenzimidazol/dimethyl acetamide solution was electrospun, and subsequently the web was steam activated at 700-900°C. The specific capacitance of the acti…
Novel coordinating motifs for lanthanide( iii ) ions based on 5-(2-pyridyl)tetrazole and 5-(2-pyridyl-1-oxide)tetrazole. Potential new contrast agents
Water-soluble and neutral Ln(III) and Zn (II) complexes of pyridine- and (pyridine-1-oxide)tetrazole have been synthesized and the Gd derivatives have great potential as high-relaxivity low-osmolarity MRI contrast agents.
Comfort Characteristics of Fabrics Containing Twist-less and Hollow Fibrous Assemblies in Weft
Comfort characteristics of plain-woven fabrics, containing viscose staple fiber twist-less and hollow fibrous assemblies and core-sheath type DREF-III yarn in weft, have been reported in the present paper. The twist-less and hollow fibrous assemblies are the individually separated parallel core and annular sheath comp…
Rearrangement of Martensite Variants in Iron-Based Ferromagnetic Shape Memory Alloys under Magnetic Field
We have investigated magnetic field-induced strain (MFIS) associated with rearrangement of martensite variants and its corresponding magnetization process in a disordered Fe-31.2Pd(at%) single crystal and an ordered Fe3Pt single crystal, exhibiting a cubic to tetragonal martensitic transformation at 230 K and 85 K, re…
Single-walled carbon nanotubes filled with M OH (M = K, Cs) and then washed and refilled with clusters and molecules
Heating single-walled carbon nanotubes (SWNTs) with molten hydroxides MOH (M = K, Cs) gave MOH@SWNT in good yield; high resolution transmission electron microscopy (HRTEM) indicated that CsOH in CsOH@SWNT often adopts twisted 1D crystal structures inside SWNTs; treating MOH@SWNT with water at room temperature removes…
Role of Composite Cathodes in Single Chamber SOFC
The influence of cathode composition on the open-circuit voltage (OCV) and the performance of a single chamber solid oxide fuel cell (SC-SOFC) was investigated. Because the SC-SOFC is operated using a mixture of air and fuel, the OCV of the cell is determined by the difference of catalytic activity between the cathode…
Applications of shape memory alloys in medical instruments
Endosmart GmbH was founded in January 2002 and is a spin-off from the Forschungszentrum Karlsruhe. Endosmart focuses on the use of NiTi mostly outside the implant market. Therefore a lot of tools especially for instruments for minimally invasive surgery are being developed. Innovative hingeless graspers, baskets, flex…