Materials Literature
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Abstract Recent progress of colloidal chemistry in the synthesis of multimaterial nanostructures incorporating transition‐metal oxides is reviewed. Attention is focused on the emerging class of hybrid nanocrystals (HNCs), in which domains of different materials are interconnected through inorganic junctions in defined…
The impact of electronic correlation in nanoscale junctions, e.g. formed by single molecules, is analyzed using the single-impurity Anderson model. Numerically exact Quantum Monte Carlo calculations are performed to map out the orbital filling, linear response conductance and spectral function as a function of the Cou…
Graphene grown epitaxially on SiC has been proposed as a material for carbon-based electronics. Understanding the interface between graphene and the SiC substrate will be important for future applications. We report the ability to image the interface structure beneath single-layer graphene using scanning tunneling mic…
Charge impurities in graphene can host an infinite family of Rydberg-like resonance states of massless Dirac particles. These states, appearing for supercritical charge, are described by Bohr-Sommerfeld quantization of collapsing classical trajectories that descend on point charge, in analogy to the hydrogenic Rydberg…
We explore the electronic properties of finite-length graphene nanoribbons as well as graphene nanodisks with various sizes and shapes in quest of metallic ones. For this purpose, it is sufficient to search zero-energy states. We find that no zero-energy states exist in finite-length zigzag nanoribbons though all infi…
Marilyn Monroe knew that "diamonds are a girl's best friend" but, in the meantime, many chemists have realized that they are also extremely attractive objects in contemporary chemistry. The chemist's diamonds are usually quite small (herein: nanometer-sized "diamondoids") and as a result of their unique structure are…
Through the use of various layer-by-layer polyelectrolyte (PE) coating schemes, such as the common poly(diallyldimethylammonium chloride)-poly(4-styrenesulfonic acid) (PDADMAC-PSS) system, the mammalian cellular uptake of gold nanorods can be tuned from very high to very low by manipulating the surface charge and func…
The conductivity of graphene samples with various levels of disorder is investigated for a set of specimens with mobility in the range of $1--20\ifmmode\times\else\texttimes\fi{}{10}^{3}\text{ }\text{ }{\mathrm{cm}}^{2}/\mathrm{V}\text{ }\mathrm{sec}$. Comparing the experimental data with the theoretical transport cal…
Three novel zinc(II) phthalocyanines substituted with one or two 3,4,5-tris(3,6,9-trioxadecoxy)benzoxy group(s) have been prepared and spectroscopically characterized. These compounds are highly soluble and remain nonaggregated in N,N-dimethylformamide. Upon excitation, they exhibit a relatively weak fluorescence emis…
This paper reports an investigation of the impact of temperature-dependent electrical and thermal conductivities (as governed by the classical Weidemann?Franz?Lorenz law) on the thermal response of nickel?chromium (nichrome) alloy cylinders. The relationship between the conductivities and temperature for nichrome is s…
Hydroxypropyl chitosan (HPCS), a water-soluble chitosan derivate, was modified by introducing photoreactive azide groups (4-azidobenzoic acid, Az-) to the amino groups of HPCS, resulting in a photocrosslinkable Az-HPCS. Novel porous chitosan scaffolds thus were fabricated by ultraviolet (UV) light irradiation of Az-HP…
Abstract The use of an accelerator based on diisopropyl xanthogen polysulfide (DIXP) to formulate bromobutyl elastomer (BIIR‐DIXP) compositions for sealing medical devices was published in the Journal of Applied Polymer Science (Ohbi, D. S.; Pureval, T. S.; Shah, T.; Siores, E. 2007, 106, 526). In this publication, a…
Despite widespread zirconium use ranging from nuclear technology to antiperspirants, important aspects of its solvation chemistry, such as the nature of small zirconium(IV) hydroxy cluster ions in aqueous solution, are not known due to the complexity of the zirconium aqueous chemistry. Using a combination of Car-Parri…
Abstract The effect of additives on glass transition behavior in melt processed blends of polystyrene (PS) and polypropylene (PP) was studied. Blends of additive‐free polystyrene and additive‐free polypropylene revealed the known effect of the PS T g increase in blend compositions where PP surrounds PS. Glass transiti…
The crystal structure of (S)-1-methylheptyl-4′-{4-octyloxy-2-{11-[4-(5-hexylpyrimidin-2-yl)phenoxy]undecanoyloxy}benzoyloxy}biphenyl-4-carboxylate, which has a relatively wide temperature range of blue phase III on cooling, has been determined. The molecule was found to form a λ-shaped structure. We have prepared a ho…
Various poly(vinyl alcohol)/carboxymethyl-chitosan (PVA/CMCS) blend films were prepared by a mechanical blending method and characterized by SEM for their surface and cross-section morphologies. It indicated that blending high CMCS content in PVA plastic led to a rough surface and loose structure. Bovine serum albumin…
The low surface energy and the great immiscibility of poly (dimethylsiloxane) (PDMS) with liquid crystals (LCs) are used in the fabrication of holographic polymer dispersed liquid crystals (HPDLCs). By adding increasing amounts of PDMS, the extent of the phase separation between the polymer and the LC, the LC channel…
We developed acicular BaTiO 3 particles achieved by controlling the morphology of BaC 2 O 4 ·0.5H 2 O to acicular shape and its phase transition to BaTiO 3 by introducing Ti ions from the coprecipitated amorphous phase. Acicular BaTiO 3 particles have an aspect ratio as high as 18, and the particle size can be control…
Abstract The performance of zirconium alloys in BWR, PWR, and PHWR nuclear reactors is dependent on the microstructure. Accordingly, the characterization of the microstructure is an integral part of any study conducted to develop models for in-reactor performance. Although the as-fabricated microstructure (texture, gr…
Abstract BACKGROUND: In this study, poly[( N ‐vinylimidazole)‐ co ‐(maleic acid)] (poly(VIm/MA)) hydrogels were prepared by γ‐irradiation of ternary mixtures of N ‐vinylimidazole–maleic acid–water using a 60 Co γ‐source. Spectroscopic and thermal analyses of these hydrogels as a function of protonation showed that the…