Materials Literature
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Preparation and in vitro degradation of shape memory nanocomposites consisting of cross-linked poly(ε-caprolactone) (c-PCL) and Fe 3 O 4 nanoparticles were investigated in this study. The degradation behaviors were evaluated from the decrease of mechanical property, weight, and molecular weight of polymer, the change…
Synchrotron x-ray diffraction and Raman scattering data supported by ab initio calculations are reported for the dense tetrahedrally bonded phase $({\text{C}}_{2}{\text{N}}_{3}\text{H})$ with a defective wurtzite (dwur) structure synthesized by laser heating from dicyandiamide $({\text{C}}_{2}{\text{N}}_{4}{\text{H}}_…
We have investigated the ultrafast far-infrared transmission of isolated single-walled carbon nanotubes using optical-pump THz-probe spectroscopy. The THz dielectric response is dominated by excitons with an initial, rapid decay due to Auger recombination followed by a slow decay of isolated single excitons. Frequency…
Water droplets can jump during vapor condensation on solid benzene near its melting point. This phenomenon, which can be viewed as a kind of micro scale steam engine, is studied experimentally and numerically. The latent heat of condensation transferred at the drop three phase contact line melts the substrate during a…
Position- and orientation-controllable micropatterned ZnO/TiO2 nanostructures with different morphologies have been fabricated using a novel and versatile superhydrophilic/superhydrophobic template. Scanning electron microscopy, optical microscopy, electron probe microanalysis and X-ray diffraction were systematically…
In this article, SnO2nanowires (NWs) have been prepared and their microwave absorption properties have been investigated in detail. Complex permittivity and permeability of the SnO2NWs/paraffin composites have been measured in a frequency range of 0.1-18 GHz, and the measured results are compared with that calculated…
By using the first-principles DFT calculations, we design a novel hydrogen storage material, Li(12)Si(60)H(60) composite, and validate its geometric stability. It is found that the adsorbed Li atoms do not cluster on the Si(60)H(60) fullerene unlike other metals such as Ti, owing to the relatively low Li-Li binding en…
Electrospun poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyvalerate] (PHBV) fibers were collected by using a counter electrode collector or a rotating disk collector. The molecular orientation and mechanical property of single PHBV fiber were studied. 2-D wide-angle X-ray diffraction and polarized Fourier transform infrar…
Ozone is known to react with single-walled nanotubes (SWNTs) to form oxide species on the nanotubes and, upon annealing, to etch the SWNTs. However, the mechanism of ozone attack is not known. We use gradient-corrected density functional theory to compute the potential energy surfaces for O 3 dissociation on the sidew…
The interrelation between specific β-nucleation, thermal history, and molecular weight of isotactic polypropylene (PP) has been investigated by wide-angle X-ray scattering, differential scanning calorimetry, and scanning electron microscopy. Samples with a broad range of molecular weight ( M w ), from 240 000 to 1 300…
Abstract Surface modification of fumed nanosilica was performed by using n ‐(2‐aminoethyl)‐3‐aminopropyltrimethoxysilane as a coupling agent. Then, modified nanosilica was utilized in the preparation of polyurethane rigid foam. The characterization and the study of properties were done by some techniques, such as Four…
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…