Materials Literature
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ABA triblock copolymers comprised of poly(β-benzyl- l -aspartate) (PBLA) as an A segment and poly(ethylene oxide) (PEO) as the B segment were precisely synthesized by a ring-opening polymerization of the N -carboxyanhydride of BLA initiated from amines at both terminals of the PEO chain. The copolymers have a number-a…
FDU-1 silicas with large (∼10 nm) cage-like mesopores were synthesized under acidic conditions using a poly(ethylene oxide)−poly(butylene oxide)−poly(ethylene oxide) triblock copolymer template. Structural changes caused by heating in water at 373 K for different periods of time (from 3 hours to 32 days) and by calcin…
The adsorption of D 2 O on Pt(111) and the coadsorption with CO have been revisited by quantitative and in situ high-resolution X-ray photoelectron spectroscopy (XPS). During D 2 O adsorption at 110 K, O 1s spectra clearly show the known formation of a bilayer and multilayers. As indicated by a binding energy change o…
The development of high voltage power module using IGBTs leads to serious problems concerning the electric field insulation. The values of these electric fields are very important regarding the capabilities of the dielectric gels used in the power packages. Solutions have to be developed to ensure limited field and go…
The bulk electronic properties of pyrrolidine-functionalized nanotubes are obtained from cyclic voltammetry measurements and discussed in the light of quantum chemical calculations. The functionalization is found to preserve the metallic character and to hardly affect the average density of electronic states.
Self-assembled supramolecular organic liquid crystal structures at nanoscale have potential applications in molecular electronics, photonics, and porous nanomaterials. Most of these structures are formed by aggregation of soft spherical supramolecules, which have soft coronas and overlap each other in the packing proc…
This study addresses endothelial cell adhesion and spreading on a family of artificial extracellular matrix (aECM) proteins designed for application in small-diameter vascular grafts. The aECM proteins contain domains derived from elastin and from fibronectin. aECM 1 contains the RGD sequence from the tenth type III d…
During the initial growth of the ferromagnetic oxide SrRuO3 on TiO2-terminated SrTiO3, we observe a self-organized conversion of the terminating atomic layer from RuO2 to SrO. This conversion induces an abrupt change in growth mode from layer by layer to growth by step advancement, indicating a large enhancement of th…
Layered ferromagnetic-piezoelectric composites show mechanical strain mediated electromagnetic coupling. Here we discuss dielectric and piezoelectric properties of ferrite-lead zirconate titanate (PZT) and lanthanum manganite-PZT samples. Results of our investigations on dielectric and pyroelectric properties of multi…
We report a process directly transforming 2D nanosheets into 1D nanotubes. Using unilamellar nanosheets as starting materials, we succeeded in obtaining titanium oxide, manganese oxide, and niobate nanotubes (15−60 nm in diameter). The transformation was achieved in a simple procedure of an ion intercalation/deinterca…
The antibacterial drug ciprofloxacin (cfH) has been used to protect gold nanoparticles of two different mean diameters, 4 and 20 nm. The protection is complete with about 65 and 585 cfH molecules covering 4 and 15 nm particles, respectively. The nature of binding has been investigated by several analytical techniques.…
Infrared reflection absorption spectroscopy (IRAS) has been used to study CO adsorption on Au clusters ranging in size from 1.8 to 3.1 nm, supported on TiO(2). The adsorbed CO vibrational frequency blue-shifts slightly (approximately 4 cm(-)(1)) compared to that adsorbed on bulk Au, whereas the heats of adsorption (-D…
Temporal fluctuations in the Raman spectrum from molecules adsorbed to noble metal colloids (i.e., “blinking”) has been viewed as a single molecule signature. It is demonstrated here that silver colloids exhibit blinking that is independent of the nature of the adsorbate. Blinking was observed on silver colloids in th…
To predict performance of modern power electronic systems, simulation-based design methods are used. This work employs the method of electrochemical impedance spectroscopy to find new equivalent-circuit models for supercapacitors and lithium-ion batteries.
This paper describes the synthesis of new nanocomposite nanoparticles that consist of polymer coated γ-Fe 2 O 3 superparamagnetic cores and CdSe/ZnS quantum dots (QDs) shell. A single layer of QDs was bound to the surface of thiol-modified magnetic beads through the formation of thiol−metal bonds to form luminescent/m…
In order to explore novel functional nanomaterials, we have developed a new synthesis method of SWNTs encapsulating foreign elements by the bias-voltage application to SWNTs in plasmas, which contain oppositely-charged ions of different species. In contrast to pristine samples, a remarkable change of the nanotube stru…
Stainless steel 316 was coated with CeO 2 and Y 2 O 3 modified aluminide and titanium aluminide coatings. The coatings were prepared by the pack cementation method and the high temperature oxidation behaviour of the coatings was investigated in an atmosphere containing a limited supply of air. The performance of the c…
The applicability of the Dreiding 2.21 and PCFF force fields to the prediction of properties of cyclo-olefin copolymers was evaluated. The initial performance of the force fields was only modest, and reoptimization of the force field parameters was required. The reoptimization was performed for the Dreiding 2.21 force…
Ag-TCNQ nanostructures are synthesized by using both solution reaction in acetonitrile and a novel vacuum vapor reaction method. Experiments show the latter synthesis method can produce Ag-TCNQ nanowires with high quality. They have diameters around 100 nm and lengths around 5 /spl mu/m. These nanowires could be poten…
We examined the effect of stirring solutions before protein crystallization, which we call pre-stirring. We previously demonstrated that stirring the protein solution continuously promotes the effective growth of protein crystals. The continuous stirring prevents excess spontaneous nucleation and accelerates the growt…