Materials Literature
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Mesoporous manganese oxide was prepared by using a straightforward, template-assisted method. The resulting material was crystalline and of uniform pore diameter. The material was characterized by HR-TEM, HR-SEM, XRD, XPS, and EXAF-XANES, and pore size distributions were calculated from nitrogen sorption studies. Thes…
The adsorption of molecular hydrogen (H2) in the graphite intercalation compound KC24 is studied both experimentally and theoretically. High-resolution inelastic neutron data show spectral features consistent with a strong pinning of H2 along a single axis. First-principles calculations provide novel insight into the…
In this paper, we report on a systematic and thorough study of wetting phenomenon on regularly patterned surfaces fabricated from inorganic-organic hybrid "core-shell" particles of different radii (100 nm to 10 microm). Inorganic silica particles were modified through chemical anchoring of polymers and silanes with di…
A statistical segment scale theory for the physical aging of polymer glasses is proposed and applied. The approach is based on a nonlinear stochastic Langevin equation of motion and the concept of an effective free energy which quantifies temporary localization, collective barriers, and the activated segment hopping p…
Bis an die Grenze: Monodisperse Nanopartikel des dreidimensionalen Koordinationspolymers [Fe(pyrazin){Ni(CN)4}] wurden in einer Matrix erhalten, die aus Kügelchen des Biopolymers Chitosan bestand (siehe Bild). Diese besonders kleinen Nanopartikel (ca. 4 nm) zeigen einen Spin-Crossover mit Hysterese.
A detailed analysis of the in situ Raman spectroelectrochemical behavior of individual semiconducting single-walled carbon nanotubes (SWCNTs) is presented. Special attention has been paid to the development of the tangential (TG) mode frequency, which shifts when the externally applied potential Ve is shifted away fro…
This work demonstrates that instead of paraelectric ${\text{PbTiO}}_{3}$, completely $c$-oriented ferroelectric ${\text{PbTiO}}_{3}$ thin films were directly grown on $(001){\text{-SrTiO}}_{3}$ substrates by pulsed-laser deposition with thickness up to 340 nm at a temperature well above the Curie temperature of bulk $…
In situ neutron diffraction data at 0.9‐s time resolution during the self‐propagating high‐temperature synthesis of Ti 3 SiC 2 from stoichiometric 3Ti+SiC+C mixtures have been further analyzed to give the phase quantities during all five stages of the identified reaction [(i) preheating, (ii) α→β phase transformation…
Bi 4− x Ho x Ti 3 O 12 (BHT‐ x ) thin films with Ho content x =0.2, 0.4, 0.6, 0.8, and 1.0 were prepared on Pt/Ti/SiO 2 /Si substrates by a sol–gel method. Effects of Ho contents on the microstructure and ferroelectric properties of BHT‐ x thin films were investigated. All the BHT‐ x samples consist of the Bi‐layered…
FeO x of different crystal phases were synthesized by altering the calcination temperature of the precursors obtained by a hydrothermal method. Crystal transformation from maghemite to hematite begins at calcination temperature of 573 K. Gold was deposited on the support uniformly with average size of approximately 5…
Copper(II) complexes of the ligand 1,n-bis[bis(2-pyridylmethyl)amino]benzene with n = 2-4 (1,n-tpbd) and its mononuclear derivative bis(2-pyridylmethyl)aniline (phbpa) were synthesized and structurally characterized. Magnetic measurements and DFT calculations were performed on [CuCl2(phbpa)], [Cu2Cl4(1,3-tpbd)], [(Cu2…
Abstract The structure and properties have been comprehensively studied for metallocene copolymers of propylene‐1‐hexene (CiPH) and propylene‐1‐octadecene (CiPOD). The comonomer content constitutes the most important factor affecting both structure and properties in these CiPH and CiPOD copolymers, although the length…
Bucket-and-spade chemistry: An environmentally friendly and highly efficient method for growing multiwalled carbon nanotubes (T) on a large scale has been developed which uses naturally abundant resources, namely garnet sand (G) as a catalyst precursor and support, and city gas as the carbon source. The as-produced ca…
The effects of the surface morphology of Ag on the surface-plasmon-enhanced emission of ZnO films have been studied for a ZnO/Ag/Si system by photoluminescence spectroscopy and atomic force microscopy. The results indicate that the enhancement of ZnO ultraviolet emission is dependent on the deposition conditions of th…
Abstract A simple efficient post‐modification route to the fabrication of hybrid gold nanoparticles with poly( N ‐isopropylacrylamide) (PNIPAm) based on click chemistry is described. The PNIPAm was prepared by reversible addition fragmentation chain transfer radical polymerization (RAFT). The PNIPAm was immobilized on…
We demonstrate the selective aggregation of single-walled carbon nanotubes by photon forces, using the large optical field gradient of a laser focused through a high numerical aperture objective lens. The nanotubes, dispersed in an aqueous solution with a surfactant, are detected via Raman scattering from the confocal…
Novel polyaniline (PANI)/epoxy hybrids have been fabricated using an absorption-transferring process in which no organic solvent is involved. An epoxy prepolymer cured by aniline monomer (DGEBA-aniline) was added to a freshly prepared PANI nanoparticles (NPs) aqueous solution with vigorous agitation and heating (ca. 9…
Near-infrared (NIR) spectroscopy is a well-established technique for solid-state analysis, providing fast, noninvasive measurements. The use of NIR spectroscopy for polymorph screening and the associated advantages have recently been demonstrated. The objective of this work was to evaluate the analytical potential of…
In this study, the relationship between the grain‐boundary composition and varistor properties were investigated using scanning electron microscopy, transmission electron microscopy, energy dispersion spectroscopy, and X‐ray photoelectric spectroscopy (XPS). It was found that the CaCu 3 Ti 4 O 12 (CCTO) sample did not…
We present evidence from computer simulations for glassy dynamics in suspensions of monodisperse hard ellipsoids. In equilibrium, almost spherical ellipsoids show a first-order transition from an isotropic phase to a rotator phase. When overcompressing the isotropic phase into the rotator regime, we observe super-Arrh…