Materials Literature
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Abstract Formation of nanocrystallites in the amorphous silicon carbide thin films deposited from silane methane mixture diluted in argon by plasma enhanced CVD has been studied under different levels of rf power density and Ar dilution. Systematic transformations between different polymorphic phases of SiC have been…
A novel approach is employed to produce core-corona nanospheres, which introduces a stereoregular hydrophilic part to an amphiphilic block copolymer. The resultant morphology is reported using isotactic-poly(methacrylic acid)-block-poly(butyl acrylate). Infrared spectroscopy revealed a supramolecular interaction, and…
Ac susceptibility measurements have been carried out on superconducting LaO 1− x F x FeAs for x =0.07 and 0.14 under He-gas pressures to ∼0.8 GPa. Not only do the measured values of d T c /d P differ substantially from those obtained in previous studies using other pressure media, but also the T c ( P ) dependences ob…
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The quasi-two-dimensional deposition of ferromagnetic materials by electrochemical process under the influence of a magnetic field applied in the plane of the growth leads to a surprising symmetry breaking in the dendritic structures found. The reasons for these features are still not completely understood. The origin…
Three polarity-sensitive organic molecules (DIAA, DIUA, and DISA) were designed and synthesized for functionalizing high-quality superparamagnetic Fe(3)O(4) nanoparticles (NPs) via the ligand exchange strategy to prepare polarity-sensitive Fe(3)O(4) NPs. The functional group is chosen to be the carboxyl group (one for…
Currently available anterior cruciate ligament (ACL) graft sources, autograft and allograft, present potential problems that a natural biomaterial ACL graft might be able to solve. Earlier efforts in the development of synthetic ACL grafts were less than optimal, and those devices have largely been abandoned. We can l…
Unterschied erkannt: Mithilfe von UV/Vis-Spektroskopie kann die Aufnahme von Gold-Nanokugeln und -nanostäben aus Mischungen in Zellen analysiert werden. Die Unterscheidung gelingt anhand der charakteristischen optischen Signaturen der Nanostrukturen (siehe Bild).
Aussichtsreich: Die ionische Flüssigkeit Methylguanidiniumborhydrid (siehe Bild; blau N, gelb B, grau C, weiß H) kann unter thermischen und katalytischen Bedingungen theoretisch 9 Gew.-% Wasserstoff freisetzen. Die thermodynamischen Eigenschaften der Verbindung sowie die bei der dehydrierenden Zersetzung entstehenden…
The chemical and structural evolution of supported PtRh alloy nano- and microparticles during oxidation has been studied by means of scanning photoelectron microscopy (SPEM) and low energy electron microscopy (LEEM). The SPEM Rh 3d and Pt 4f images and microspot spectra revealed a higher reactivity of the Rh atoms and…
Abstract Raman maps, i.e., grids of individual spectra of Raman scattering from excitation laser beam focused by optical microscope, were used to characterize mixed phase silicon thin films. Raman maps measured with 442 nm and 785 nm lasers were compared with topography or local current maps recorded by conductive ato…
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Fully dense, transparent, submicron, polycrystalline, anatase thin films, deposited for 30-120 min on glass slides heated at 400°C, were prepared by ultrasonic spray pyrolysis using titanium butoxide dissolved in methanol. The films were characterised using laser Raman microspectroscopy, single beam focused ion beam m…
TEM foil preparation techniques commonly used in geology, material science and cosmochemistry are argon ion milling, ultramicrotomy and the Focused Ion Beam (FIB) technique. In this study we report on Argon Ion Slicing (ArIS), a new gentle preparation method which enables for the first time to prepare super large cont…
Numerical simulation is performed for droplet impact and deposition on a microstructured surface. The droplet deformation is calculated by a sharp-interface level-set method which is extended to treat the immersed solid structure and the contact angle at the liquid–gas–solid interline. The computations are further car…
Lead free perovskite Ba(La1/2Nb1/2)O3 was prepared by conventional ceramic fabrication technique at 1375°C for 7 h in air atmosphere. The crystal symmetry, space group and unit cell dimensions were estimated using Rietveld analysis. X-ray diffraction analysis indicated the formation of a single phase monoclinic struct…
In this study, we describe the use of the combination of eletrografting poly(N-mercaptoethyl acrylamide) and Au nanoparticles in the construction of high-performance biosensors. The poly(N-mercaptoethyl acrylamide) was electrografted onto the glassy carbon electrode surface, which provided a strongly adhering primer f…
Novel self-emulsifying acrylic polymer aqueous dispersions (NPAD) for two component waterborne polyurethane coatings (2K-WPU) were prepared by the emulsification of self-emulsifying polymer blends in water, which the polymer blends typically consist of two acrylic polymers, one is a salt group containing polymer (P1),…
Poly(styrene-co-dimethylaminoethyl methacrylate) and poly(methyl methacrylate-co- dimethylaminoethyl methacrylate) were prepared by solution polymerization. These polymers were quaternized by methyl iodide and n-hexyl bromide. The produced polymers were used as support in the aqueous oxidation of 2,6-di-tert-butylphen…
Polcalcins are pollen-specific proteins containing two EF-hands. Atypically, the C-terminal EF-hand binding loop in Phl p 7 (from timothy grass) harbors five, rather than four, anionic side chains, due to replacement of the consensus serine at -x by aspartate. This arrangement has been shown to heighten parvalbumin Ca…