Materials Literature
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In the last decade, high-resolution data have become available for macromolecular objects. Furthermore, ultrahigh-resolution diffraction data (resolution close to 0.6 A) have been collected for several protein crystals. This allows the study of fine details of the electron-density distribution such as the deformation…
A small cysteine-rich protein, the function of which remains elusive, was discovered in the exudate of a Penicillium species. Crystal diffraction experiments conducted using in-house Cu Kalpha radiation and an R-AXIS IV++ imaging-plate detector yielded high-quality data to 1.4 A, with a distinguishable anomalous signa…
Spiropyrans undergo reversible photoisomerization between their ring-closed (spiro) and ring-open (merocyanine) forms when exposed alternately to ultraviolet and visible light. Rates of K + ion leakage from phosphatidylcholine unilamellar vesicles containing a K + -selective crown ether attached to an amphiphilic spir…
The potential of rational surface mutagenesis for enhanced protein crystallization is being probed in an ongoing effort. In previous work, it was hypothesized that residues with high conformational entropy such as Glu and Lys are suitable targets for surface mutagenesis, as they are rarely incorporated in crystal cont…
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…