Materials Literature
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Abstract Summary: High‐molecular‐weight poly(butylene succinate) (PBS) is prepared by the lipase‐catalyzed polymerization of dimethyl succinate and butane‐1,4‐diol via the formation of cyclic oligomers as a new strategy for the green production of bio‐based plastics. The cyclic oligomer is first produced by the lipase…
Preface. List of Abbreviations. PART I: CELL CULTURE. 1. Basic Principles of Cell Culture (R. Freshney). 2. Mesenchymal Stem Cells for Tissue Engineering (D. Lennon & A. Caplan). 3. Human Embryonic Stem cell Culture for Tissue Engineering (S. Levenberg, et al.). 4. Cell Sources for Cartilage Tissue Engineering (B. Joh…
Abstract The polymerization of ε‐caprolactone initiated by trivalent rare earth (Ln) derivatives, namely the isopropoxide ‘Ln(OiPr) 3 ’ opposed to the borohydride Ln(BH 4 ) 3 (THF) 3 (Ln = La, Nd, Sm) and (Cp*) 2 Sm(BH 4 )(THF) (Cp* = (η‐C 5 Me 5 )), has been evaluated. The comparison, based on the structure of the in…
We have investigated the role of the solvents in the luminescence from colloidal 3C-SiC suspensions. By dispersing electrochemically etched polycrystalline 3C-SiC wafers in water, ethanol, or toluene, we have fabricated suspensions of 3C-SiC nanocrystals that exhibit intense photoluminescence. By taking into account t…
The field emission of individual ZnO multipods and a single arm of a multipod structure grown by a vapor deposition were carried out. A current of 1 nA with an ultralow onset voltage of 40 V was observed repeatedly for the single multipod as well as for the arm. The nonlinearity observed in the Fowler–Nordheim plots h…
In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess t…
Nearly pure Ti 3 AlC 2 powders have been synthesized by calcining a mixture of titanium, aluminum, and graphite powders using tin powders as additives. Four recipes with different mole ratios of Ti:Al:C:Sn were examined at calcining temperatures from 1300° to 1500°C. The addition of Sn effectively inhibited the genera…
The refrigerant capacity (RC) of Fe68.5Mo5Si13.5B9Cu1Nb3 alloy is studied. For the amorphous sample, RC=63Jkg−1 for an optimal reversible cycle with cold and hot ends at 328K and 520K, respectively, for a maximum applied field H=15kOe. Nanocrystallization diminishes both the peak entropy change and RC of the material.…
Abstract Three‐arm poly (ε‐caprolactone, reactive extruded) (REX‐PCL) polymer was continuously produced using a twin‐screw extruder with aluminum tri‐sec butoxide (ATSB) initiator in residence times of less than five minutes. Monomer conversions in excess of 95% were achieved, and high molecular weight PCL was produce…
Experiments reveal that PbK2LiNb5O15 which belongs to the tetragonal tungsten bronze family presents paraelectric and ferroelectric phases and a complex structural change between them. High and low temperature phases are of symmetry P4/mbm and Pba2 respectively, so that this change is also of ferroelastic type. As pre…
We report on a novel scheme to perform efficient simulations of Scanning Tunneling Microscopy (STM) of molecules weakly bonded to surfaces. Calculations are based on a tight binding (TB) technique including self-consistency for the molecule to predict STM imaging and spectroscopy. To palliate the lack of self-consiste…
Renewed focus on the P-Si system due to its potential application in quantum computing and self-directed growth of molecular wires, has led us to study structural changes induced by P upon placement on Si(001)-$p(2\times 1)$. Using first-principles density functional theory (DFT) based pseudopotential method, we have…
Elastic theory of ring-(or cylinder-)shaped crystals is constructed and the generation of edge dislocations due to geometrical frustration caused by the bending is studied. The analogy to superconducting (or superfluid) vortex state is pointed out and the phase diagram of the ring-crystal, which depends on radius and…
It is shown that dilute niobium doping has significant effect on the ferromagnetism and microstructure of dilutely cobalt-doped anatase TiO2 films. Epitaxial films of anatase TiO2 with 3% Co, without and with 1% niobium doping were grown by pulsed-laser deposition at 875 C at different oxygen pressures. For growth at…
Low-frequency (∼100Hz) dielectric properties of CaCu3Ti4O12 were investigated in detail near room temperature. A dielectric relaxation peak was observed at about 250 K with an activation energy of 0.54 eV. This peak can be tuned by annealing treatment in nitrogen and oxygen. The results can be well explained by consid…
The shifts of the emission band to longer wavelength (yellow-orange) of the Sr3SiO5:Eu yellow phosphor under the 450–470 nm excitation range have been achieved by adding the codoping element (Ba2+) in the host. In order to apply to white-light-emitting diodes (LEDs) with warm white and high color rendering index, we h…
The primary aim of this work was to synthesize aligned perchloric-acid-doped poly(aniline) (HClO(4)-doped PANI) nanotubes by a simple alumina template method and to investigate their application in lithium/poly(aniline) rechargeable batteries. Powder X-ray diffraction analysis (XRD), scanning electron microscopy (SEM)…
Abstract We report on the first optical characterization of both cubic and hexagonal SrMnO 3 . Room‐temperature Raman spectra collected by means of a micro‐Raman spectrometer are shown. The spectrum of the cubic compound is characterized by weak and broad bands in agreement with group theory which predicts no Raman‐ac…
We present an experimental study of the electronic structure of MnSi. Using X-ray Absorption Spectroscopy, X-ray photoemission and X-ray fluorescence we provide experimental evidence that MnSi has a mixed valence ground state. We show that self consistent LDA supercell calculations cannot replicate the XAS spectra of…
The dielectric properties of noncrystalline hafnium silicon oxynitride (HfSiON) films with a variety of atomic compositions were investigated. The films were deposited by reactive sputtering of Hf and Si in an O, N, and Ar mixture ambient. The bonding states, band-gap energies, atomic compositions, and crystallinities…