Materials Literature
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Au nanoparticles exhibited both negative and positive nonlinear absorptions with ground-state plasmon bleaching and free-carrier absorption that could be origins of the saturable and reverse-saturable optical properties. Au/Ag coreshells displayed only positive nonlinear absorption and reverse-saturable optical proper…
The effect of an applied mechanical stress on the tunneling conductance of a ferroelectric tunnel barrier between substrates and dissimilar electrodes is studied. Using a thermodynamic model and taking into account polarization charge screening in the electrodes and the near-surface inhomogeneous polarization distribu…
Pre-edge features in x-ray absorption spectroscopy contain key information about the lowest excited states and thus on the most interesting physical properties of the system. In transition-metal oxides they are particularly structured but extracting physical parameters by comparison with a calculation is not easy due…
Abstract An intelligent shape‐memory polymer was made through the synthesis of poly(lactic acid) macromonomers with furanyl groups and crosslinking with linkers with maleimidyl groups. The thermoreversible covalent bonds formed by the Diels–Alder reaction between these groups made this polymer recyclable (i.e., enviro…
Novel biodegradable star poly(ester−urethanes) containing three-arm poly(ε-caprolactone) (PCL) as switching segment were prepared as shape-memory polymers (SMPs) with switching temperature ( T s ) around body temperature. PCL-triols with molecular weight ( M n ) of 2700−4200 g/mol and T m of 45−47 °C were synthesized…
OBJECTIVES: This review sheds insight into an increasingly popular polymer that has been widely explored as a potential drug delivery system. The abundant, biodegradable and biocompatible polysaccharide chitosan, with many other favourable properties, has been favoured as a drug delivery system for the purposes of enc…
Flame-retardant polypropylene (PP) samples were in situ compatibilized with maleic anhydride grafted PP. Compatibilization reaction was verified by an IR spectrum and gel content measurements. Electron microscopy images showed that compatibilization could considerably reduce the size of the flame-retardant domains, co…
We report measurements of the nonequilibrium electron energy distribution in carbon nanotubes. Using tunneling spectroscopy via a superconducting probe, we study the shape of the local electron distribution functions, and hence energy relaxation rates, in nanotubes that have bias voltages applied between their ends. A…
Engineered particles and capsules prepared by the layer-by-layer assembly of interacting polymers have potential in drug delivery and microreactor applications. Herein, we report a new, versatile method to covalently stabilize and functionalize polymer-coated particles and polymer capsules utilizing robust and efficie…
In the aim of protecting stainless steel surfaces against protein and/or bacterial adhesion, thin films including the glycosidase hen egg white lysozyme (HEWL) and/or the synthetic polymer poly(ethylene glycol) (PEG) were covalently coated onto flat substrates by wet chemical processes. Chemical grafting of both speci…
Selective hydrogenolysis of glycerol to propylene glycol was performed using an environmentally friendly hydrotalcite-derived mixed-metal oxide catalyst. The Mg/Al, Zn/Al, Ni/Mg/Al, Ni/Co/Mg/Al, and Cu/Zn/Al mixed-metal oxide catalysts were prepared from their corresponding hydrotalcite precursors having M 2+ /M 3+ co…
Control over the wettability of solids as well as the manufacturing of functional surfaces with special wetting properties has aroused much interest because of great advantages given to various applications in daily life, industry, and agriculture. We report here the dynamic optical control of the wetting behavior of…
A series of aluminum ethyls and isopropoxides based on a bis(pyrrolidene) Schiff base ligand framework has been prepared and characterized. NMR studies of the dissolved complexes indicate that they adopt a symmetric structure with a monomeric, five-coordinated aluminum center core. The aluminum ethyls used as catalyst…
A compound with the FeAs-layers, namely, $({\text{Sr}}_{3}{\text{Sc}}_{2}{\text{O}}_{5}){\text{Fe}}_{2}{\text{As}}_{2}$ (abbreviated as FeAs-32522), was successfully fabricated. It has a layered structure with the space group of $I4/mmm$, and with the lattice constants $a=4.069\text{ }\text{\AA{}}$ and $c=26.876\text{…
Bone marrow-derived mesenchymal stem cells (MSCs) have received much attention as a potential treatment for myocardial infarction because of their potential to integrate into the host myocardium and repair the injured heart. The mode of action of stem cell-mediated cardiac repair is still somewhat unclear, including t…
Direct decomposition of N(2)O to N(2) using perovskite hollow fiber membranes is achieved by combination with in situ oxygen removal (see picture). A coupled partial methane oxidation allows N(2)-free synthesis gas to be obtained. This sustainable process combines N(2)O removal with the simultaneous production of valu…
Highly luminescent and stable InP/ZnS core−shell nanocrystals were developed by stepwise addition of zinc acetate and dodecanethiol to an InP core solution. Zinc acetate plays an important role in surface etching and ZnS shell formation.
Using predesigned trains of femtosecond optical pulses, we have selectively excited coherent phonons of the radial breathing mode of specific-chirality single-walled carbon nanotubes within an ensemble sample. By analyzing the initial phase of the phonon oscillations, we prove that the tube diameter initially increase…
Transparent electrodes made of single-component ultrathin (<10 nm) metal films (UTMFs) are obtained by sputtering deposition. We show that the optical transparency of the deposited films (chromium and nickel) is comparable to that of indium tin oxide (ITO) in the visible and near-infrared range (0.4-2.5 microm), while…
Recently we found strong evidence in favor of a BCS-like condensation of excitons in $1T{\text{-TiSe}}_{2}$ [Cercellier et al., Phys. Rev. Lett. 99, 146403 (2007)]. Theoretical photoemission intensity maps have been generated by the spectral function calculated within the exciton condensate phase model and set against…