Materials Literature
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[structure: see text] Palladium-catalyzed coupling of 1,2-bis(4-bromophenyl)-3,4,5,6-tetraphenylbenzene and the corresponding hexaphenylbenzene bis(boronic acid) gave a mixture of linear and cyclic oligomers of hexaphenylbenzene. An X-ray crystal structure of the tetrameric oligomer showed it to be the polyphenylene m…
We compare optical properties of ${\mathrm{Sm}}^{3+}$-doped ${\mathrm{ZnS}}_{0.8}{\mathrm{Se}}_{0.2}/\mathrm{undoped}$ ZnS multiple-quantum wells (MQWs) with different well widths (2, 5, 10 monolayers) and bulk ${\mathrm{ZnS}}_{0.8}{\mathrm{Se}}_{0.2}:{\mathrm{Sm}}^{3+}$ crystal. The excitonic peak in the photolumines…
We consider a binary mixture of hard colloidal spheres and nonadsorbing polymer coils. The polymers are regarded as effective spheres that interact with one another via a repulsive step-function pair potential and with colloids solely via excluded volume. The system is treated with a geometry-based density functional…
#Reprinted from Supramolecular Polymers, Ciferri, A., Ed.; Marcel Dekker, Inc.: New York, 2000, 359–434.
The photoalignment of alternate layer-by-layer (LBL) deposited water-soluble azobenzene dye, direct red 80 (DR80), and polycations have been investigated. The ultrathin films were probed by polarized irradiation, UV−vis spectroscopy, and angle-dependent optical retardation measurements using a hybrid liquid crystal (L…
The Stokes–Einstein (SE) relation is a form of the fluctuation-dissipation theorem (FDT), and relates the diffusion coefficient of colloidal particles to the viscosity via the thermal energy kBT. We study the diffusion coefficient and viscosity of concentrated hard-sphere colloidal model systems in the frequency domai…
We describe the syntheses and electrochemical properties of four oligothiophene derivatives endowed with the tricyanovinyl (TCV) group, which facilitates reduction and promotes π-stacking, suggesting these materials may be suitable for n-type, and possibly ambipolar, transport. Compound 1 crystallizes in the noncentro…
Crystalline boron nanowires were produced through post-annealing amorphous boron nanowires synthesized by rf magnetron sputtering. High-resolution transmission electron microscopy was used to characterize the microstructure of the crystalline boron nanowires. Selected-area electron diffraction studies showed that the…
We have performed dielectric hole burning experiments on supercooled glycerol at frequencies up to five decades above the peak frequency of the dielectric loss. While most observations of heterogeneous dynamics refer to the slower than average relaxation times, this study confirms the existence of independent relaxati…
A series of regular alternating terpolymers of ethene and propene with carbon monoxide with different Et/CO content was characterized by wide- and small-angle x-ray scattering, differential scanning calorimetry, and diamagnetic susceptibility measurements. All terpolymers proved to be amorphous at room temperature. Th…
Poly(ethylene terephthalate) (PET) powder was depolymerized at atmos‐ pheric pressure in sulfuric acid in presence of 2.5 N phosphoric acid at 88–140°C. Particle sizes ranging from 50 to 512.5 µm and reaction time 30–200 min required for PET hydrolysis were optimized. Terephthalic acid (TPA) and ethylene glycol (EG) w…
We demonstrate the importance of anisotropic interface properties in microstructure evolution by comparing computed evolved microstructures to final experimental microstructures of 5170 grains in 19 thin aluminum foil samples. This is the first time that a direct experimental validation of simulation has been performe…
Organic derivatives of a layered perovskite compound, HLaNb 2 O 7 · x H 2 O (HLN), with interlayer surfaces possessing n -alkoxyl groups ( n -decoxyl and n -propoxyl) have been allowed to react with various alcohols and a diol (ethylene glycol) to form new organic derivatives via substitution reactions. The reaction o…
By employing monomer-resolved Monte Carlo simulations, we analyze the conformations, density distributions, correlation functions, and the form factor of model dendrimers of fourth generation. We find that these objects are hybrids between polymer chains and compact colloidal particles, with the fluctuations of the mo…
Crown-annelated quater- (4T) and sexithiophenes (6T) with oligooxyethylene chains of various lengths attached at the 3-positions of the terminal thiophene rings have been synthesized. Analysis of the cation-binding properties of the macrocycles by (1)H NMR and UV-vis spectroscopy reveals the formation of a 1:1 complex…
We report on the interface properties of thermally oxidized n-GaN metal–oxide–semiconductor capacitors fabricated on sapphire substrates. 100-nm-thick β-Ga2O3 was grown by dry oxidation at 880 °C for 5 h. From secondary ion mass spectrometry measurements, an intermediate Ga oxynitride layer with graded compositions is…
Self-organized single crystalline two-dimensional hexagonal arrays of pores in InP semiconductor compound are reported. We show that the self-arrangement of pores can be obtained on n-type substrates with (100) and (111) orientations. The long-range order in pore distribution evidenced in (100)InP samples proves to be…
The 3D-hexagonal mesoporous films are used as templates to grow uniform silver nanoparticles. The grafting of hydrophobic groups at the pore surface, significantly slows down the silver ion diffusion, anchoring small silver clusters in micropores and leading to organized domains of silver particles in mesopores with a…
We have fabricated a single-wall carbon-nanotube (CNT)-based nonvolatile memory device using SiO2–Si3N4–SiO2 (ONO) layers as a storage node. The memory device is composed of a top gate structure with a channel width of a few nanometers and the ONO layer embedded between CNT and gate electrode. When the bias voltage be…
Structural and dynamic properties of cristobalite silica have been studied using molecular dynamics simulations based on a charge transfer three-body potential model. In this potential model, the directional covalent bonding of SiO2 is characterized by a charge transfer function of the interatomic distance between Si…