Materials Literature
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Smectic membranes are perfect model systems for studying low-dimensional phase transitions and the associated fluctuations. During the last two decades we have seen important progress in the understanding of the structure and fluctuation behavior of these systems, driven by both new experimental techniques and theoret…
Abstract Single‐crystalline thin films of the homologous series InGaO 3 (ZnO) m (where m is an integer) are fabricated by the reactive solid‐phase epitaxy (R‐SPE) method. Specifically, the role of ZnO as epitaxial initiator layer for the growth mechanism is clarified. High‐temperature annealing of bilayer films consis…
Creating hybrid nanostructures consisting of disparate nanoscale blocks is of interest for exploring new types of quantum device architectures. Here, we demonstrate the novel anchoring of monolayer-protected gold nanoclusters of 1−3 nm diameter to sidewalls of carbon nanotubes (CNTs) via hydrophobic interactions betwe…
An efficient meso-triarylcorrole synthesis is detailed, and the formation and spectroscopic properties of their diamagnetic square-planar d(8) Ag(III) complexes are described. The spectroscopic properties of the [corrolato]Ag(III) complexes are contrasted with those of the corresponding [porphyrinato]Ag(II) complexes.…
We develop a simple computational model for cell boundary evolution in plastic deformation. We study the cell boundary size distribution and cell boundary misorientation distribution that experimentally have been found to have scaling forms that are largely material independent. The cell division acts as a source term…
Nanocrystalline (∼15−20 nm) 3 mol % yttria-stabilized zirconia (3YSZ) powder is synthesized via sol−gel technique. A reduced activation energy value of ∼13.0 ± 0.9 kJ/mol is observed for grain growth in nano-3YSZ powder, within the calcination temperature range of 400−1200 °C, which is much lower than that (580 kJ/mol…
A model is tested to rapidly evaluate the vibrational properties of alloys with site disorder. It is shown that length-dependent transferable force constants exist, and can be used to accurately predict the vibrational entropy of substitutionally ordered and disordered structures in Au-Cu, Au-Pd, and Cu-Pd. For each r…
We generalize to magnetic transition metals the approach proposed by Choi and Ihm for calculating the complex band structure of periodic systems, a key ingredient for future calculations of conductivity of an open quantum system within the Landauer-Buttiker theory. The method is implemented with ultrasoft pseudopotent…
We report our studies of the potential energy surface (PES) of selected binary Lennard-Jones clusters. The effect of adding selected impurity atoms to a homogeneous cluster is explored. Inherent structures and transition states are found by combination of conjugate-gradient and eigenvector-following methods while the…
Abstract The paper reviews electrochemically etched pores in III–V compound semiconductors (GaP, InP, GaAs) with emphasis on nucleation and formation mechanisms, pore geometries and morphologies, and to several instances of self‐organization. Self‐ organization issues include the formation of single‐crystalline two‐di…
A new type of surfactant peptide designed to mimic the properties of cationic lipid systems is described. These cationic surfactant peptides are approximately 2 nm in length with a cationic, hydrophilic head consisting of one to two residues of lysine or histidine followed by a hydrophobic tail of six alanine, valine,…
The influence of ionic strength (I) and pH on the permeability of polyelectrolyte multilayers (PEMs) was studied. Fluorescein crystals were coated with a sodium poly(styrenesulfonate) (PSS)/poly(allylamine hydrochloride) (PAH) multilayer shell at pH 2.0 and subsequently dissolved at pH 7.0 or 8.0. From the release pro…
Abstract We report on solution‐processed hybrid solar cells consisting of a nanocrystalline inorganic semiconductor, CuInS 2 , and organic materials. Synthesis of quantized CuInS 2 nanoparticles was performed using a colloidal route, where the particle surface was shielded by an organic surfactant. First attempts were…
Time-resolved carrier dynamics in single-wall carbon nanotubes is investigated by means of two-color pump-probe experiments. The recombination dynamics is monitored by probing the transient photobleaching observed on the interband transitions of the semiconducting tubes. This dynamics takes place on a 1 ps time scale…
Nanostructures of wurtzite‐structured zinc sulfide , which is unlikely to be stable at room temperature under conventional conditions, have been synthesized by a simple physical process. Morphologies with belt‐ (see Figure), saw‐, comb‐, and windmill‐like nanostructures have been observed and characterized using a var…
Abstract A nonwettable polypropylene (PP) surface was modified by an ion‐assisted reaction (IAR) to improve its adhesion with a conjugated polymer, polyaniline (PAN). Hydrogen ions with energies ranging from 0.6 to 1 keV were irradiated on the PP surface in an oxygen gas environment. Ion doses were in the range 5 × 10…
Abstract Infrared spectra of polyamide‐6 (PA6) with and without epoxidized natural rubber (ENR) are presented. The influence of ENR used as a compatibilizer on the morphologies, crystallizability, mechanical properties, and thermal behavior of the polyamide‐6/polyolefins (PO) blends are studied. The infrared spectra s…
Abstract Biodegradable plastics (GSD) based on soy dreg (SD) were prepared by compression‐molding, with glycerol as the plasticizer and glutaraldehyde (GA) as the cross‐linker. The structure and properties of the GSD sheets were investigated by Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), d…
Ultrafast energy exchanges of a non-Fermi electron gas with the lattice are investigated in silver clusters with sizes ranging from 4 to 26 nm using a femtosecond pump-probe technique. The results yield evidence for a cluster-size-dependent slowing down of the short-time energy losses of the electron gas when it is st…
Abstract New cyclic oligomers of the copolymer of poly(ethylene terephthalate) (PET) and poly(ethylene isophthalate) (PEI) were isolated and identified. A condensation polymerization was carried out at a high temperature, and the solid‐state polymerization that followed yielded the high molecular weight polymer. The o…