Materials Literature
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An accurate force-field has been parametrized for PET and is employed to simulate a long chain, consisting of 120 repeat units, over a wide temperature and pressure range, for long time scales. The force field has been validated against the experimental results for the pressure−volume−temperature properties, the chara…
We show by pump-probe spectroscopy that the optical response of a fishnet metamaterial can be modulated on the femtosecond time scale. The modulation dynamics is dominated by pump-induced changes in the constituting dielectric medium, but the strength of modulation is dramatically enhanced through the plasmon resonanc…
The nonlinear elastic response of carbon nanotubes (CNTs) in torsion is derived with objective molecular dynamics and a density-functional-based tight-binding model. The critical strain beyond which CNTs behave nonlinearly, the most favorable rippling morphology, and the twist- and morphology-related changes in fundam…
Abstract The dynamic viscoelastic properties of uncrosslinked and dynamically crosslinked blends of polypropylene (PP) and ethylene octene copolymer (EOC) were investigated in the melt state to study the mechanism of reinforcement, influence of particle size, and kinetics of modulus recovery. Dynamic vulcanization was…
We present block copolymer multiple patterning as an efficient and truly scalable nanolithography for sub-20 nm scale patterning, synergistically integrated with conventional ArF lithography. The directed assembly of block copolymers on chemically patterned substrates prepared by ArF lithography generated linear verti…
In many hyperspectral applications it is beneficial to produce 2D spatial images with a single exposure at a few selected wavelength bands instead of 1D spatial and all spectral band images like in push-broom instruments. VTT has developed a new concept based on the Piezo actuated Fabry-Perot Interferometer to enable…
This review describes advances made in three areas of molecular magnetic materials of the types A: extended frameworks (coordination polymers) showing long-range magnetic order, B: spin-coupled clusters with emphasis on single molecule magnets and (n × n) grid species, C: polynuclear spin-switching (spin crossover) co…
Poly(oligo(ethylene glycol) methacrylate) (POEGMA) brushes are extremely protein resistant polymer coatings that can reduce nonspecific adsorption of proteins from complex mixtures such as blood, sera and plasma. These coatings can be prepared via atom transfer radical polymerization with excellent control of their th…
Metal-Oxide-Semiconductor (MOS) structures containing 74Ge nanocrystals (NC-Ge) imbedded inside the SiO_2 layer were studied for their capacitance characterization. Ge atoms were introduced by implantation of 74Ge+ ions with energy of 150 keV into relatively thick (~640nm) amorphous SiO_2 films. The experimental chara…
We present magnetotransport studies performed on an extended set of (Ga,Mn)As samples at 4.2 K with longitudinal conductivities ${\ensuremath{\sigma}}_{xx}$ ranging from the low-conductivity to the high-conductivity regime. The anomalous Hall conductivity ${\ensuremath{\sigma}}_{xy}^{(\text{AH})}$ is extracted from th…
Theory of diffusion-mediated reactions is already established for the target problem in the dilute limit, where the immobile target is surrounded by many quenchers. For lattice random walks in the crowded situation, each quencher is surrounded by other quenchers differently. As a result, each quencher migrates differe…
The ground-state properties of $R{\text{MnO}}_{3}/A{\text{MnO}}_{3}$ (RMO/AMO) heterostructures (with $R=\text{La},\text{Pr},\dots{}$, a trivalent rare-earth cation and $A=\text{Sr},\text{Ca},\dots{}$, a divalent alkaline cation) are studied using a two-orbital double-exchange model including the superexchange couplin…
Time-resolved Raman spectroscopy has been applied to probe the anharmonic coupling and electron-phonon interaction of optical phonons in graphite. From the decay of the transient anti-Stokes scattering of the $G$-mode following ultrafast excitation, we measured a lifetime of $2.2\ifmmode\pm\else\textpm\fi{}0.1\text{ }…
The ability to determine the structure of matter in three dimensions has profoundly advanced our understanding of nature. Traditionally, the most widely used schemes for 3D structure determination of an object are implemented by acquiring multiple measurements over various sample orientations, as in the case of crysta…
Abstract Phototuning of more than 2000 nm is demonstrated in an azobenzene‐based cholesteric liquid crystal (azo‐CLC) consisting of a high‐helical‐twisting‐power, axially chiral bis(azo) molecule (QL76). Phototuning range and rate are compared as a function of chiral dopant concentration, light intensity, and thicknes…
Hole spin relaxation in [001] strained asymmetric Si/Si$_{0.7}$Ge$_{0.3}$ (Ge/Si$_{0.3}$Ge$_{0.7}$) quantum wells is investigated in the situation with only the lowest hole subband being relevant. The effective Hamiltonian of the lowest hole subband is obtained by the subband Löwdin perturbation method in the framewor…
Random copolymers consisting of n -butyl acrylate backbones with quadruple hydrogen-bonding side chains based on 2-ureido-4[1 H ]-pyrimidinone (UPy) have been synthesized via controlled radical polymerization and postpolymerization functionalization. Through this synthetic strategy high UPy monomer content (15 mol %)…
Conducting polymers are an interdisciplinary research area involving close collaborations between chemists, material scientists, physicists, and engineers. The field has developed during the last 30 years due to an interest in academic research as well as in possible commercial applications. Much research has been per…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTSpectroscopic and Theoretical Studies of Transition Metal Oxides and Dioxygen ComplexesYu Gong, Mingfei Zhou*, and Lester Andrews†View Author Information Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Advanced Materials Labor…
Single-molecule surface-enhanced Raman scattering (SERS) detection of nonresonant molecules is demonstrated experimentally using the bianalyte SERS method. To this end, bianalyte SERS is performed at 633 nm excitation using the nonresonant molecule 1,2-di-(4-pyridyl)-ethylene (BPE) in combination with a benzotriazole…