Materials Literature
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Abstract Thiophene functionalized polystyrene samples (TFPS) were synthesized by atom transfer radical polymerization (ATRP) of styrene, followed by Suzuki coupling with 3‐thiophene (Th) boronic acid. Conducting graft polymer of TFPS with thiophene was achieved at 1.5 V in tetrabutylammonium tetrafluoroborate/dichloro…
Phospholipid onion phases were investigated as biomimetic media for the synthesis of silica in a confined environment. Stable multilamellar nanovesicles incorporating sodium silicate solutions could be obtained. Upon aging, silica condensation occurs in the onion interlayer space while preserving the initial multilame…
We have studied the transport properties of mechanically stable Fe3O4 and La0.7Sr0.3MnO3 nanoconstrictions patterned by focused ion-beam milling. The magnetoresistance decreases with the square of the applied voltage and scales with the resistance of the constriction, with values up to 8000% for magnetite and 100% for…
This paper provides an elementary introduction to the basic concepts used in describing epitaxial crystal growth in terms of the thermodynamics and kinetics of atomic steps. Selected applications to morphological instabilities of stepped surfaces are reviewed, and some open problems are outlined.
Using BaTiO3 as a piezoelectric model system we compare a finite element model with experimental data to demonstrate the impact of grain topography on the in-plane piezoelectric response at the perimeter. Our findings emphasize the need for a careful consideration of both electric field and piezoelectric tensor orient…
We report Monte Carlo simulations of alloying and stress relaxation in $\mathrm{Ge}∕\mathrm{Si}(100)$ dome and pyramidal islands. In both cases, the simulated composition profiles consist of inhomogeneous Si-rich cores and outer Ge-rich shells. Comparison to experimentally deduced profiles gives us the opportunity to…
An evaluation and comparison of two different approaches, GRID/CPCA and GRIND/CPCA (CPCA = consensus principal component analysis; GRIND = GRid-INdependent Descriptors), suitable for visualizing the structural differences between related proteins is presented. Ten crystal structures of CDK2/cyclin A and GSK3beta solve…
Abstract Diamond films were grown in an ASTeX MW PE CVD reactor. The effect of pre‐growth etching with a O 2 /H 2 plasma and the influence of the methane concentration on growth on type Ib (100) HPHT synthetic diamonds were investigated. By controlling step flow growth we were able to prepare optical quality thick dia…
In-plane dielectric properties of ⟨110⟩ oriented epitaxial (Ba0.60Sr0.40)TiO3 thin films in the thickness range from 25–1200nm have been investigated under the influence of anisotropic epitaxial strains from ⟨100⟩ NdGaO3 substrates. The measured dielectric properties show strong residual strain and in-plane directiona…
The solubility of potassium clavulanate in ethanol, 1-propanol, 1-butanol, 2-propanol, and 2-methyl-1-propanol between 273 K and 305 K were measured using a laser technique. This method was used to determine the dissolution of the solid phase in a solid + liquid mixture. Results of these measurements were correlated w…
Over the past decade, biology has had a profound influence on materials science and engineering, and much of this influence is yet to come. The tools of nanotechnology have enabled researchers to examine intricate and ingenious solutions that nature has devised in diverse areas ranging from structures to signaling. Th…
We describe the synthesis and characterization of a family of biocompatible ABA-triblock copolymers that comprised of hydrophilic A-blocks of poly(ethylene glycol) and hydrophobic B-blocks of oligomers of suberic acid and desaminotyrosyl-tyrosine esters. The triblock copolymers spontaneously self-assemble in aqueous s…
We analyze the principal vibrational spectra of vitreous GeO(2) and derive therefrom structural properties referring to length scales beyond the basic tetrahedral unit. We generate a model structure that yields a neutron structure factor in accord with experiment. The inelastic-neutron, the infrared, and the Raman spe…
The low-frequency $({10}^{2}--{10}^{5}\phantom{\rule{0.3em}{0ex}}\mathrm{Hz})$ dielectric properties and dc resistivity of oxygen-doped ${\mathrm{La}}_{2}\mathrm{Cu}{\mathrm{O}}_{4+y}$ ceramic samples were investigated as a function of temperature $(23--300\phantom{\rule{0.3em}{0ex}}\mathrm{K})$. The as-prepared sampl…
Abstract Stable dispersions of impure multiwall carbon nanotubes (multiwall carbon nanotubes and carbon soot) in an acrylated epoxidized soy oil (AESO) based thermosetting resin were obtained by mechanical stirring. The required stirring time increased with an increasing amount of carbon nanotubes. Thermogravimetric a…
Comb-shaped copolymers consisting of rigid fluorinated polyimide (FPI) backbone and well-defined polystyrene (PS) side chains (FPI- cb -PS), or poly(pentafluorostyrene) (PFS) side chains (FPI- cb -PFS), were synthesized by atom transfer radical polymerization (ATRP) from the bromide-containing FPI macroinitiators (FPI…
A nondestructive method to determine the hydrogen content at the surface of diamondlike carbon and polymeric thin films is proposed. The method relies on the analysis of the elastic peak produced by backscattering of electrons from the hydrogen atoms present at the sample surface. Quantitative analysis of the H conten…
Large Ca0.28Ba0.72Nb2O6 (CBN-28) single crystals exhibit saturated ferroelectric hysteresis loops under an electric field of 115kV∕cm along the [001] direction. Their spontaneous polarization, remanent polarization and coercive field are 35.3μC∕cm2, 32.2μC∕cm2, and 38.1kV∕cm, respectively. The dielectric constant and…
We describe an approach that utilizes nonlinear peptides to direct the assembly of previously reported Self-Assembling Fibers (SAFs). The SAF system comprises two complementary linear peptides, SAF-p1 and SAF-p2a, which combine to form exclusively linear, nonbranched fibers. The Matrix-Programming (MaP) peptides descr…
The charge distribution on the surface of a biased conductive, finite-length, cylindrical nanotube, free standing above an infinite grounded plane, is investigated. The diameter range of the cylinder tube under study is 20–60 nm, which is much larger than the screening length, meaning the quantum and statistical effec…