Materials Literature
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Photooxidation of β -carotene and canthaxanthin in mesoporous MCM-41, Ni-MCM-41, and Al-MCM-41 molecular sieves was studied by 9−220 GHz electron paramagnetic resonance (EPR) and 9 GHz electron nuclear double resonance (ENDOR). X-ray powder diffraction (XRD) measurements established that the MCM-41 pore size (33 Å) wa…
Abstract The double melting behavior of poly(butylene terephthalate) (PBT) was studied with differential scanning calorimetry (DSC) and wide‐angle X‐ray analysis. DSC melting curves of melt‐crystallized PBT samples, which we prepared by cooling from the melt (250 °C) at various cooling rates, showed two endothermic pe…
The cytotoxicity of a unimolecular polymeric micelle (1) and its degradation products was assessed by cell proliferation and viability with L929 mouse areolar/adipose fibroblasts. Polymer 1 and poly(ethylene glycol) (PEG) were diluted to concentrations from 10(-4) to 10(-6) M in culture media, whereas the degradation…
With on- and off- resonant excitation photons, spin-resolved Auger electron spectra of epitaxial CrO$_{2}$ thin films show an experimental evidence of the spin-selective KLL Auger decay. The on-resonance O KLL Auger electrons are found to be highly spin-polarized, while the off-resonance ones with almost zero spin pol…
The experimentally observed ferromagnetism in MgB2 in the normal state is attributed to micro phase separated inclusions of iron. This magnetic character is also observed when the iron content of the samples is reduced below 20 micro-g/g, however in these samples the diamagnetism of MgB2 is apparent and is measured. I…
Sonochemical decomposition of Fe(CO) 5 was carried out in the presence of different surfactants. The reactions give stable colloids of undecenoate, dodecyl sulfonate, and octyl phosphonate coated Fe 2 O 3 nanoparticles of 5−16 nm in diameter. The ionic binding of the surfactants to the nanoparticle surfaces was confir…
Efficient recognition of DNA is a prerequisite for the development of biological effectors, including transcription and translation regulators, transfection vectors, and DNA sensors. To provide an effective scaffold for multivalent interactions with DNA, we have fabricated mixed monolayer protected gold clusters (MMPC…
A large magnetic entropy change about twice as high as that of pure gadolinium metal near room temperature has been discovered in manganese perovskites La 0.837 Ca 0.098 Na 0.038 Mn 0.987 O 3.00 (8.3 J·kg -1 ·K -1 , at 256 K) and La 0.822 Ca 0.096 K 0.043 Mn 0.974 O 3.00 (6.8 J·kg -1 ·K -1 , at 265 K) under a magnetic…
Changes in the atomic structure and optical properties of amorphous films in the As-Se system upon annealing have been studied on films prepared by thermal evaporation in a vacuum and by RF ion-plasma sputtering. The annealing modifies the atomic structure of the films and shifts their optical absorption edge. Changes…
Micro-Raman study in the temperature range of 70-575 K was performed to investigate the overlap of the basic phase transitions in barium titanate ceramics and single crystals of low Zr concentration. The possibilities of stress and grain size effects that are crucial for the optimization and reproducibility of the pro…
Micrometer-sized carbon tubes and their regularly assembled structures can be easily prepared via the pyrolysis of composite fibers consisting of a poly(ethylene terephthalate) (PET) core and a conducting polymer skin layer, such as polypyrrole (PPy). Using this new chemical approach, the diameter, wall thickness, and…
Terfenol-D particulate composites have been fabricated with and without a preferred crystal orientation of the particles. A 25% volume fraction polymer matrix composite was fabricated in a magnetic field using geometric anisotropy to orient needle shaped particles with long axis [112] orientation along the length of t…
Abstract Cellulose membranes and cellulose/casein blend membranes were successfully prepared from a new solvent system (6 wt % NaOH/4 wt % urea aqueous solution) by coagulation with a sulfuric acid aqueous solution. The structures and properties of the membranes were characterized by Fourier transform infrared spectro…
Present publication gives a detailed report about the experimental results obtained concerning the effect of external constant stress on the magnetic field controlled strain response during the cyclic change of the magnetic field. Simultaneously we represent a brief overview of the most important structural and magnet…
Results from an effort to fabrication shape memory alloy hybrid composite (SMAHC) test specimens and characterize the material system are presented in this study. The SMAHC specimens are conventional composite structures with an embedded SMA constituent. The fabrication and characterization work was undertaken to bett…
Tissue engineering (TE) is a new interdisciplinary field of applied research combining engineering and biosciences together with clinical application, mainly in surgical specialities, to develop living substitutes for tissues and organs. Tissue engineering approaches can be categorized into substitutive approaches, wh…
Heat capacity in the 1 K range and close to T g was studied in a series of poly( n -alkyl methacrylate)s, PnAMA, including some random copolymers. We report on two findings: (i) The glass transition temperature T g and the cooperativity of the α process that freezes-in at T g, N α ( T g ), decrease smoothly between me…
Magnetically controlled shape memory (MSM) materials are considered now as a potential candidate for a new class of actuators and sensors. Magnetic and mechanical properties of two NiMnGa alloys with different thermally induced martensitic phases have been studied. Five-layered tetragonal martensite (c/a=0.94) in the…
Tension and torsion as well as combined tension-torsion tests on NiTi Tubes are presented in this article. Two different specimens are used in the experiments: one is austenitic and the other is martensitic at room temperature. The experiments are performed at nearly isothermal conditions. However, non-isothermal effe…
The first complete investigation of the structure of the selective oxidation catalyst TS-1 is presented. Constant wavelength powder neutron diffraction data collected on isotopically substituted titanium silicalite (TS-1) samples, with a Si:Ti molar ratio of 39:1, have been studied using a combination of single and mu…