Materials Literature
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The enzymatic growth of diblock copolymer micelles consisting of single-stranded DNA and poly(propylene oxide) (PPO) segments was studied with scanning force microscopy (SFM). DNA- b -PPO aggregates adsorbed randomly on a mica surface exhibiting a height of 4–5 nm. The size of the micelles was increased by terminal de…
A single crystal of a natural orthopyroxene with composition M 2 [Fe 2+ 0.818 Mg 0.156 Ca 0.010 Mn 0.016 ] M1 [Fe 2+ 0.081 Mg 0.767 Al 0.084 Fe 3+ 0.068 ] TA [Si] TB [Si 0.848 Al 0.152 ]O 6 and space group Pbca (sample S95) was investigated at high pressure by X-ray diffraction using a diamond-anvil cell up to 9.56 GP…
We present a new framework for the description of macromolecules subject to confining geometries. The two main ingredients are a new computational method and the definition of a new molecular size parameter. The computational method, hereafter referred to the confinement analysis from bulk structures (CABS), allows th…
The role of band bending in affecting surface recombination velocity measurements has been evaluated by combining barrier height data with charge-carrier lifetime measurements for Si(111) surfaces in contact with a variety of acidic aqueous electrolytes. Charge-carrier lifetimes and thus surface recombination velociti…
The microstructure and porosity of as–cured and crushed sodium–based geopolymers has been examined by electron microscopy (SEM, TEM, STEM), mercury intrusion porosimetry (MIP) and specific surface area measurements, respectively. These techniques indicate that that the intrinsic microstructure is nanoporous and nanopa…
Scanning transmission electron microscopy images of the 00l white mica planes in crystals from central Switzerland and Crete, Greece, reveal that domains of paragonite, margarite, and muscovite are ordered within the basal plane. Energy dispersive X-ray analyses show that both cations in the interlayer and in the 2:1…
Some biotechnological inventions involve expensive, sophisticated machines. Others are relatively simple innovations that nevertheless address, and solve difficult problems. Synthesis and purification of highly hydrophobic peptides can be a difficult and challenging task, particularly when these peptides have low solu…
Lanthanum oxide-based catalysts are active in the elimination of HCl from C 2 H 5 Cl, 1,2-C 2 H 4 Cl 2 and 1,1,2-C 2 H 3 Cl 3 leading to the formation of their respective chlorinated ethenes. An oxygen-rich catalytic surface may form CO, CO 2 and C 2 HCl as side products, whereas with chlorine-rich catalytic surfaces…
Ordered mesoporous thin films of composites of rutile TiO2 nanocrystals with amorphous Ta2O5 are fabricated by evaporation-induced self-assembly followed by subsequent heat treatment beyond 780 degrees C. Incorporation of selected amounts of Ta2O5 (20 mol %) in the mesoporous TiO2 film, together with the unique mesopo…
Stacked dielectric elastomer actuators are fabricated by an automated process using spin coating of uncured elastomers. To improve the performance of these multilayer actuators we present two different ways. To reduce the driving voltage it is desirable to fabricate dielectric films with a thickness below 20 μm. This…
Boronic acids have emerged as one of the most useful class of organoboron molecules, with application in synthesis, catalysis, analytical chemistry, supramolecular chemistry, biology, and medicine. In this study, the structural and spectroscopic properties of n-butylboronic acid were investigated using experimental an…
We report low-temperature and high-pressure measurements of the electrical resistivity $\ensuremath{\rho}(T)$ of the antiferromagnetic compound $\mathrm{Ni}{\mathrm{S}}_{2}$ in its high-pressure metallic state. The form of $\ensuremath{\rho}(T,p)$ suggests the presence of a quantum phase transition at a critical press…
From the underground parts of Picrorhiza scrophulariiflora, three new caffeoyl glycosides, scrocaffeside A-C (1-3), together with two caffeic acid derivates, 4-O-beta-D-glucopyranosyl caffeic acid (4) and 4-methoxy caffeic acid (5) and a phenylethanoid glycoside, scroside D (6), were isolated. Their structures were el…
Molecular dynamics simulations and first-principles electronic structure calculations are used to study the structural behavior of orthoenstatite, MgSiO 3 , at high pressures. The calculations suggest two possible high-pressure polymorphs of orthoenstatite, one with P2 1 ca and the other with Pbca symmetry. Both polym…
Surface plasmon-polaritons have recently attracted renewed interest in the scientific community for their potential in sub-wavelength optics, light generation and non-destructive sensing. Given that they cannot be directly excited by freely propagating light due to their intrinsic binding to the metal surface, the lig…
Dippu-allatostatins (ASTs) have pleiotropic effects in Locusta migratoria. Dippu-ASTs act as releasing factors for adipokinetic hormone I (AKH I) from the corpus cardiacum (CC) and also alter juvenile hormone (JH) biosynthesis and release from the corpus allatum (CA). Dippu-AST-like immunoreactivity is found within la…
We measured the angle- and polarization-resolved reflection and photoluminescence spectra of ZnO inverse opals. Significant enhancement of spontaneous emission is observed. The enhanced emission not only has good directionality but can also be linearly polarized. A detailed theoretical analysis and numerical simulatio…
The OH-initiated oxidation reactions of m-xylene are investigated using density functional theory. The structures, energetics, and relative stability of the OH-m-xylene reaction intermediate radicals have been determined, and their activation barriers have been analyzed to assess the energetically favorable pathways t…
The formation of Ge quantum dot arrays by deposition from a low-temperature plasma environment is investigated by kinetic Monte Carlo numerical simulation. It is demonstrated that balancing of the Ge influx from the plasma against surface diffusion provides an effective control of the surface processes and can result…
An ab initio computational study of the regulating function of the methyl group in the strength of the CH...O hydrogen bond (HB) with XCC-H (X = H, CH3, F) as a HB donor and HOY (Y = H, CH3, Cl) as a HB acceptor has been carried out at the MP2/aug-cc-pVDZ and MP2/aug-cc-pVTZ levels. The bond lengths, interaction energ…