Materials Literature
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One-pot preparation of shell-type silver−gold bimetallic nanostructures with hollow interiors and bearing nanospikes, based on colloid seed-engaged replacement reaction and colloid-mediated deposition reactions, has been reported. Heating-induced evolution of Ag−Au bimetallic nanoshells can lead to spontaneous product…
We have developed a differential scanning calorimeter capable of working under applied magnetic fields of up to 5 T. The calorimeter is highly sensitive and operates over the temperature range 10–300 K. It is shown that, after a proper calibration, the system enables determination of the latent heat and entropy change…
The morphology, microstructure, surface area, porosity, and chemical composition of soot particles emitted from a gas-turbine combustor have been studied. Combustor soot particles appear to be chemically and structurally unstable and present microporosity and a strongly disordered graphitic structure. Discrepancies be…
Recently it was suggested that tetrahedral liquids such as water and silicon exhibit a fragile-to-strong transition while approaching the glass-transition temperature ( T g ). Such a drastic change in the fragility of liquid as a function of temperature is very rarely observed. Here we propose that, contrary to the po…
In situ DRIFTS was used to investigate the formation and reactivity of surface species on Ag/Al 2 O 3 during partial oxidation of CH 3 CHO, C 2 H 5 OH, and C 3 H 6 . The exposure of Ag/Al 2 O 3 to CH 3 CHO/C 2 H 5 OH/C 3 H 6 + O 2 in a steady state leads to the formation of two kinds of partial oxidation products: ace…
A molecular dynamics simulation study of the influence of a polymer melt matrix consisting of bead-necklace polymers on the effective interaction between two spherical nanoparticles was performed. The potential of mean force (POMF) between the two nanoparticles as well as entropy and energy contributions to the POMF w…
Zr-doped ZnO (ZZO) thin films have been investigated as an anode material, a potential alternative to indium tin oxide (ITO), for organic light emitting diode (OLED) devices. ZZO films have been deposited on glass substrates by pulsed laser deposition. The electrical and optical properties of these films were studied…
Molecular-dynamics simulations are utilized to simulate solvation and van der Waals forces between two nanoparticles immersed in a Lennard-Jones liquid. Three different sizes and shapes of nanoparticles with solvophilic and solvophobic properties are investigated. We compare different methods for calculating van der W…
We report experiments using high-resolution size exclusion chromatography (HRSEC), dynamic light scattering, and transmission electron microscopy to investigate the effects of aging of Au nanoclusters in the presence of surfactant ligands. We first describe our observations of the role of thiols as etchants to produce…
The pseudoelastic behavior of shape memory alloy (SMA) materials is a phenomenon associated with reversible thermoelastic martensitic transformation. Despite significant insight into macroscopic pseudoelasticity, relatively little is known about the mechanisms responsible for the pseudoelastic behavior at nanometer sc…
Using high-resolution transmission electron microscopy, we obtained structure images of strontium titanate (SrTiO3) with a clearly resolved oxygen sublattice along different crystallographic directions in the bulklattice and for a Sigma3 tilt grain boundary. Comparison with image simulations showed that the grain boun…
An infrared spectroscopic study of CO 2 that becomes permanently trapped in carbon nanotube bundles during thermolysis is reported. The temperature dependence of the ν 3 modes for trapped CO 2 is studied with two-dimensional infrared correlation spectroscopy. Computer simulations are used to extract the basic physics…
The Lodge–McLeish model of miscible blend dynamics is compared to literature data for the segmental or terminal dynamics of components in six different miscible polymer mixtures. In most cases, the model successfully fits the experimental data for a given component with a parameter φself, which is independent of tempe…
In this paper, we show that the surface tension of charge-stabilized titania suspensions strongly depends on the particle concentration. The surface tension first decreases significantly with an increase in the weight percent and then increases with a further increase in the weight percent. Thermodynamic arguments are…
A method to describe the switching characteristics of the ferroelectrics is proposed, using the first-order reversal curve (FORC) diagrams. On these diagrams, the reversible and irreversible contributions to the ferroelectric polarization can be clearly separated. They are extremely sensitive to the changes of the hys…
Molecular dynamic studies of melting of nitromethane have been carried out using two methods: (1) void-nucleated melting with the gradual heating of the lattice and (2) equilibration of coexisting liquid and solid phases. The results are in near agreement with each other; the small difference is attributed to the hyst…
We report how aqueous foams lose their elasticity along two trajectories in the jamming phase diagram. With time, bubbles unjam due to coarsening. Rheology is measured over nearly six (five) decades in frequency (time); surprisingly, it is linear and well behaved at low frequencies. With shear, bubbles also unjam. Rhe…
We report on the growth mechanism, structure, and luminescence properties of ZnO hexagonal columns grown from Zn vapor and air plasma. Single-crystal ZnO columns grow in the [0001] direction through repeated nucleation and growth of epitaxial hexagonal pyramids on the c-planes. Homoepitaxial nucleation of three-dimens…
On the basis of our concept that the introduction of heteroatoms and shape-persistency into the pi-macrocycles should bring forth striking functions or properties, heteroarenecyclynes (such as oxaarenecyclynes and thiaarenecyclynes) with semi-shape-persistent structure, and arene-azaarenecyclynes with shape-persistent…
A range of pseudo-random silver structures, where there is a choice of clustered spheres or pillars or tori, have been fabricated on silicon using the method of island lithography combined with electroless plating. Pyridine has been adsorbed on these structures and the surface-enhanced Raman scattering spectrum (SERS)…