Materials Literature
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A novel type of photocontrollable Prussian blue (PB) magnetic nanoparticle has been designed and prepared by using the reverse micelle technique. These magnetic nanoparticles possess a well-organized nanoscale structure. Reversible photoisomerization of azobenzene chromophores realized photoswitching of the magnetizat…
Abstract Summary: Fabrication of honeycomb‐patterned films from amphiphilic dendronized block copolymer (PEO 113 ‐ b ‐PDMA 82 ) by ‘on‐solid surface spreading’ and ‘on‐water spreading’ method is reported. Highly ordered honeycomb films with quasi‐horizontally paralleled double‐layered structure can be fabricated by th…
Abstract A gas barrier and biodegradable multilayer material was processed with a paper substrate, chitosan, and carnauba wax. The first step consisted of the study of the chitosan coating to obtain a dense polymer layer at the paper surface. The influence of the molecular weight and the concentration of the chitosan…
Robust arrays of ordered nanoparticles (see Figure and cover) have been created by combining two self-assembly strategies: microphase separation of block copolymers and coordination chemistry. Thin films of a microphase-separated block copolymer serve as templates for patterning of terpyridine-functionalized gold nano…
The Brillouin elastic free energy change ΔΦ between thermally annealed and quenched (Na2O)x(SiO2)1−x glasses is found to increase linearly for x>0.23 (floppy phase), and to nearly vanish at x 0.23, but to nearly vanish in the 0.18<x<0.23 range, suggesting the existence of an intermediate phase between the floppy and s…
We have performed multi-canonical chain-growth simulations of a polymer interacting with an adsorbing surface. The polymer, which is not explicitly anchored at the surface, experiences a hierarchy of phase transitions between conformations binding and nonbinding with the substrate. We discuss the phase diagram in the…
Stack 'em high: A polyimide with pyromellitic diimide units linked by hexaoxyethylene segments can be made to fold by cooperative two-point interactions on addition of a folding agent (see scheme). The ammonium group of the folding agent forms complexes with the oxyethylene spacer which greatly facilitates the formati…
Chilean volcanic soils are known to contain large amounts of organic matter (OM) and amorphous (e.g., allophanic) clay. Here, we test the hypothesis that Al, rather than clay content and climatic conditions, is the most important factor for OM levels in volcanic soils. This was achieved by compiling a total of 225 ped…
The need for diluted magnetic semiconductors has stimulated research on Mn-doped ZnO. However, the type of magnetic coupling (ferro/para) in ZnMnO remains an issue of debate. We have investigated the magnetic properties of Mn-doped ZnO layers grown by molecular beam epitaxy. Some samples showed a hysteresis with remna…
Finite element (FE) models were built to define the optimal experimental conditions for tip-enhanced Raman spectroscopy (TERS) of thin samples. TERS experimental conditions were mimicked by including in the FE models dielectric or metallic substrates with thin dielectric samples and by considering the wavelength depen…
We examine the interactions between gold nanoparticles stabilized by the 4-(dimethylamino)pyridine (DMAP−Au NP ) and various polyelectrolytes (PEs), both in solution and in layer-by-layer (LbL) assembled multilayer films. UV−vis spectrophotometry studies showed that the plasmon absorption band of the DMAP−Au NP in sol…
Poly[(R)-3-hydroxybutyrate] (P(3HB)) and its copolymers are accumulated by a wide variety of microorganisms as intracellular carbon and energy material, and are extensively studied as biodegradable and biocompatible thermoplastics. However, these microbial polyesters have not been recognized as practical because of th…
On cores: Silver carboxylates react with a mixture of S(tBu)SiMe3 and S(SiMe3)2 (in the presence of a bidentate phosphine ligand) to yield [Ag123S35(StBu)50] (1) or [Ag344S124(StBu)96] (2, see picture: blue Ag+, red S atoms of the StBu groups, yellow S2−, gray C) with maximum diameters of 2.5 (1) or 3.7 nm (2). These…
A technique for distinguishing biological material based on surface-enhanced Raman scattering (SERS) is reported in this work. Of particular interest is biological material that can be airborne. Silver colloidal particles with diameters in the range 10 to 20 nm and with a characteristic ultraviolet-visible (UV-VIS) ab…
Preparation of cellulose-polyamine composite films and beads, which provide high loading of primary amines on the surface allowing direct one-step bioconjugation of active species, is reported using an ionic liquid (IL) dissolution and regeneration process. Films and bead architectures were prepared and used as immobi…
Abstract Hole transport properties in high‐purity single crystal CVD diamond samples were studied using the time of flight technique with optical excitation of the carriers. The measurements were taken at different temperatures in the interval 80–470 K. By varying the intensity of the optical excitation over several o…
We propose a novel model for the shear failure of a glued interface between two solid blocks. We model the interface as an array of elastic beams which experience stretching and bending under shear load and break if the two deformation modes exceed randomly distributed breaking thresholds. The two breaking modes can b…
Modelling heat transfer of carbon nanotubes is important for the thermal management of nanotube-based composites and nanoelectronic devices. By using a finite element method for three-dimensional anisotropic heat transfer, we have simulated the heat conduction and temperature variations of a single nanotube, a nanotub…
In this study, single-walled carbon nanotube and bisphenol-A-polycarbonate composite beams were fabricated by a solution mixing process and dynamic (cyclic) load tests were performed to characterize energy dissipation. We report up to an order of magnitude (&gt;1000%) increase in loss modulus of the polycarbonate…
The infrared conductivity $\ensuremath{\sigma}(\ensuremath{\omega})$ of ${\mathrm{Na}}_{x}\mathrm{Co}{\mathrm{O}}_{2}$ is studied as a function of doping and temperature for $0.5\ensuremath{\leqslant}x\ensuremath{\leqslant}1$. A far-infrared peak (FIP) in $\ensuremath{\sigma}(\ensuremath{\omega})$, which coexists with…