Materials Literature
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Abstract Sisal fiber‐reinforced epoxy composites having three different fiber orientations, namely LL, LT, TT mentioned in the text were prepared and tested for their high stress abrasive wear behavior. Effect of fiber orientation, sliding distance, and load on abrasive wear of sisal–epoxy composites have been determi…
Abstract Raman spectroscopy was used to study the molecular structure of a series of selected rare earth (RE) silicate crystals including Y 2 SiO 5 (YSO), Lu 2 SiO 5 (LSO), (Lu 0.5 Y 0.5 ) 2 SiO 5 (LYSO) and their ytterbium‐doped samples. Raman spectra show resolved bands below 500 cm −1 region assigned to the modes o…
BACKGROUND: Non-viral methods of gene delivery, especially using polyethylenimine (PEI), have been widely used in gene therapy or DNA vaccination. However, the PEI system has its own drawbacks, which limits its applications. METHODS: We have developed a novel non-viral delivery system based on PEI coated on the surfac…
The site and charge disordered solid solution 0.8Pb(Fe1∕2Nb1∕2)O3–0.2Pb(Mg1∕2W1∕2)O3 is a magnetoelectric relaxor which shows broad and frequency dependent maxima both in the electric as well as in the magnetic susceptibilities. The Vogel-Fulcher-type electric relaxor freeze-out is accompanied by a significant magneti…
The authors report a soft x-ray absorption spectroscopy and magnetic circular dichroism study of the ferromagnetism in pulsed-laser-deposited Cu-doped ZnO thin films, which display robust room-temperature ferromagnetic signatures using bulk magnetization probes. In this work, the authors probe the spin asymmetries in…
All Xcited: At low temperatures, an intense beam of hard X-rays excites photoswitchable molecular spin-crossover systems to generate metastable high-spin states (see picture). These states have spectroscopic properties similar to those of the states generated by light-induced excited-spin-state trapping. The new appro…
A noncontact scanning probe microscopy method of probing local frequency-dependent dielectric spectroscopy is described. Dielectric spectra can be measured with this technique from 0.01to100Hz, in nanometer-scale near-surface regions of materials. The technique is applied to polymer films (polyvinyl acetate), in order…
Abstract A new family of thermoplastic nanocomposites based on isotactic polypropylene (iPP) and inorganic fullerene‐like tungsten disulfide (IF‐WS 2 ) has been successfully prepared. A very efficient dispersion of IF‐WS 2 material was obtained by mixing in the melted polymer without using modifiers or surfactants. Th…
Abstract Silica nanoparticles (17 ± 4 nm in diameter) were modified by grafting polystyrene chains to the surfaces using atom transfer radical polymerization (ATRP). The molecular weight of the grafted chains ranged from 8 to 48 kDa. These modified nanoparticles were mixed in solution with poly(styrene) homopolymer (1…
Abstract FT‐Raman spectra were obtained for thiophenol (TP) and TP on gold nanoparticles. All vibrational fundamentals for the TP molecule are assigned on the basis of the scaled quantum force field procedure. Three model systems are studied and compared for the interactions of TP with the Au atom: (1) TP with a Au at…
Slow, nonequilibrium dynamics during delayed sedimentation in a colloidal depletion gel was studied by x-ray photon correlation spectroscopy. The intermediate scattering functions change during the process from stretched to compressed exponential decays, indicating a jamming transition toward full aging. A complex agi…
The high density hole doping (1.7×1021cm−3) for a wide gap (Eg=∼2.8eV) p-type semiconductor was achieved on 40nm thick Mg-doped LaCuOSe epitaxial films. These films exhibited distinct free carrier absorption, and the effective mass and momentum relaxation time were analyzed. Its small hole mobility [∼3.5cm2∕(Vs)] comp…
Abstract Multi‐walled carbon nanotube/Poly(butylene terephthalate) nanocomposites (PCTs) were prepared by melt compounding. The microstructure of PCTs was investigated using transmission electron micrographs and Fourier transform infra‐red spectrometer. The linear and nonlinear as well as transient rheological propert…
Substrate stiffness is an important physical factor in the response of many cell types. Although protein-based hydrogels are widely used as cell-culture substrates because of their resemblance to the natural extracellular matrix (ECM) and complex signaling, their rigidity should be further increased to facilitate the…
On the turn: Torsional strain has been used to control the pitch of helical nanostructures in the range of tens to hundreds of nanometers. In this method, sterically induced torsional strain on the primary helices forces the secondary helices into superhelices, with the pitch tunable depending on the magnitude of the…
This study aims at assessing the influence of the competitive preadsorption of human serum albumin (HSA) and human plasma fibronectin (FN) from binary solutions and 10% plasma on MC3T3-E1 osteoblast adhesion and morphology on two types of TiO2 substrates. One was commercially pure titanium with a titanium oxide layer…
Reiche Ernte: Das Einschließen kleiner Mengen eines π-konjugierten Oligomers (molekularen Drahts) in ein selbstorganisiertes gelbildendes Donorgerüst lieferte eine supramolekulare lichtsammelnde Antenne. Die supramolekularen Oligo(p-phenylenvinylen)-Bänder erleichtern die schnelle Excitonenwanderung und das Tunneln de…
Doppelidentität: Es braucht eine einzige Phenylenverdrillung, um den dichotomen Charakter eines Di-para-benzihexaphyrins offenkundig zu machen (siehe Bild; Phenylenringe in Rot). Dieses expandierte Porphyrinoid schaltet in einem ungewöhnlichen lösungsmittel- und temperaturabhängigen Gleichgewicht zwischen Hückel- und…
In this letter the authors present the observation of giant magnetothermal conductivity in NiMnIn single crystals. Upon cooling, a martensitic transformation is accompanied by a ferromagnetic metal→ferrimagnetic poor-metal transition. Most strikingly, this transition can be shifted to lower temperature and even totall…
A general approach for considering primary ferroic (ferroelectric, ferromagnetic, ferroelastic) nanoparticle phase transitions was proposed in phenomenological theory framework. The surface stress, order parameter gradient, and striction, as well as depolarization, demagnetization, and de-elastification effects, were…