Materials Literature
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Abstract Graphene is the first example of truly two‐dimensional crystals – it's just one layer of carbon atoms. It turns out that graphene is a gapless semiconductor with unique electronic properties resulting from the fact that charge carriers in graphene obey linear dispersion relation, thus mimicking massless relat…
The calculation of the electronic properties of materials is an important task of solid-state theory, albeit particularly difficult if electronic correlations are strong, e.g., in transition metals, their oxides and in f-electron systems. The standard approach to material calculations, the density functional theory in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and Functional Evolution of MetallacrownsGellert Mezei, Curtis M. Zaleski, and Vincent L. PecoraroView Author Information Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48108-1005, and Department of Chemistry, Fra…
(201)-oriented β-Ga 2 O 3 thin films were grown on c -plane sapphire substrates by plasma-assisted molecular beam epitaxy. In-plane X-ray diffraction measurements revealed the inclusion of α-Ga 2 O 3 and rotational domains. However, the film grown under the optimized growth conditions exhibited a sharp absorption edge…
Complex systems in condensed phases involve a multidimensional energy landscape, and knowledge of transitional structures and separation of time scales for atomic movements is critical to understanding their dynamical behavior. Here, we report, using four-dimensional (4D) femtosecond electron diffraction, the visualiz…
Composite materials loaded with nanometer-sized reinforcing fillers are widely believed to have the potential to push polymer mechanical properties to extreme values. Realization of anticipated properties, however, has proven elusive. The analysis presented here traces this shortfall to the large-scale morphology of t…
Using an atomic force microscope, we measured effective spring constants of stacks of graphene sheets (less than 5) suspended over photolithographically defined trenches in silicon dioxide. Measurements were made on layered graphene sheets of thicknesses between 2 and 8nm, with measured spring constants scaling as exp…
We present calculations of the quasiparticle energies and band gaps of graphene nanoribbons (GNRs) carried out using a first-principles many-electron Green's function approach within the GW approximation. Because of the quasi-one-dimensional nature of a GNR, electron-electron interaction effects due to the enhanced sc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton-Coupled Electron TransferMy Hang V. Huynh and Thomas J. MeyerView Author Information DE-1: High Explosive Science and Technology Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and Department of Chemistry, University of North Carolina at Chapel Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterparticle Coupling Effect on the Surface Plasmon Resonance of Gold Nanoparticles: From Theory to ApplicationsSujit Kumar Ghosh and Tarasankar PalView Author Information Department of Chemistry, Raidighi College, Raidighi-743383, South 24-Parganas, India, and Department o…
Functional characterization of a protein sequence is a common goal in biology, and is usually facilitated by having an accurate three-dimensional (3-D) structure of the studied protein. In the absence of an experimentally determined structure, comparative or homology modeling can sometimes provide a useful 3-D model f…
Most of the new technological advances developed by humans are inspired on natural systems, organs, functions or devices present in living creatures and developed through millions of years of biological evolution. Natural systems and devices combine efficiency and intellectual, scientific and techno...
Photoacoustic pressure signals produced in an absorbing substrate under a layer of a transparent liquid irradiated by two successive nanosecond laser pulses are studied experimentally. The first pulse causes the heating and explosive boiling up of the liquid layer in contact with the irradiated surface, while the seco…
The wear behavior of Si 3 N 4 ceramics sintered with various rare earth additives was studied for nonlubricated sliding under different conditions, and scratch tests carried out in an attempt to correlate the wear behavior. When multiple scratch testing is used the results can be used to indicate the initial wear beha…
Structural properties of the layered organic superconductor ${\ensuremath{\kappa}}_{\mathrm{L}}\text{\ensuremath{-}}{(\mathrm{DMEDO}\text{\ensuremath{-}}\mathrm{T}\mathrm{Se}\mathrm{F})}_{2}[\mathrm{Au}{(\mathrm{C}\mathrm{N})}_{4}](\mathrm{THF})$ have been investigated, where DMEDO-TSeF is dimethyl(ethylenedithio)tetr…
Shape memory polymer (SMP) can recover its original shape under the effect of the external stimuli. Its primary advantages over other smart materials are the high strain capacity (200% reversible strain), low density and low cost. The series of SMP based on styrene with the different cross linking agent were synthesiz…
Abstract The dimetallic complexes [{Ni(cyclen)}{Mn(N)(CN) 4 } · CH 3 OH] n (cyclen = 1,4,7,10‐tetraazacyclododecane) ( 1 ), [{Cu(cyclen)}{Mn(N)(CN) 4 }] n ( 2 ), and [{Mn(5,5′‐Me 2 salen)} 2 {Mn(N)(CN) 4 } · CH 3 OH] n [5,5′‐Me 2 salen = N , N′ ‐bis(5,5′‐dimethylsalicylidene)‐ o ‐ethylenediimine] ( 3 ) have been synth…
Hard X-ray PhotoEmission Spectroscopy (HAXPES) is a new tool for the study of bulk electronic properties of solids using synchrotron radiation. We review recent achievements of HAXPES, with particular reference to the VOLPE project, showing that high energy resolution and bulk sensitivity can be obtained at kinetic en…
Water adsorption and desorption on porous Vycor were systematically examined by using dielectric spectroscopy at room temperature. Two relaxation peaks were observed, one for surface water (peak 1) and the other water beneath the surface water (peak 2). Quantitative analysis of the data demonstrated that the dielectri…
The aim of this study is to investigate the effect of hygrothermal aging on both the static and thermo-mechanical behavior of polyetherimide composites. Tensile testing and dynamic mechanical thermal analysis were performed on the hygrothermally aged polyetherimide composites in the climatic cabin. The decrease in the…