Materials Literature
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Atomistic simulations are used to study the bending of rectangular graphene nanoribbons subjected to axial stress both for free boundary and supported boundary conditions. The shapes of the deformations of the buckled graphene nanoribbons, for small values of the stress, are sine waves where the number of nodal lines…
The electrodynamic properties of $\text{Ba}{({\text{Fe}}_{0.92}{\text{Co}}_{0.08})}_{2}{\text{As}}_{2}$ and $\text{Ba}{({\text{Fe}}_{0.95}{\text{Ni}}_{0.05})}_{2}{\text{As}}_{2}$ single crystals have been investigated by reflectivity measurements in a wide frequency range. In the metallic state, the optical conductivi…
A fluorescent dye, the pyridomethene-BF(2) complex, has been synthesized. Although pyridomethenes did not exhibit fluorescence, pyridomethene-BF(2) complexes exhibited fluorescence both in solution and in the solid state. The trifluoromethyl-substituted BF(2) complex formed a J-aggregate and showed the highest fluores…
We investigate the possibility to control the symmetry of ordered states in phase-field crystal models by tuning nonlinear resonances. In two dimensions, we find that a state of square symmetry as well as the coexistence between squares and hexagons can be easily obtained. In contrast, it is delicate to obtain the coe…
First principles calculations of the damping rates (inverse inelastic lifetimes) of low energy quasiparticles in bulk Pb are presented. Damping rates are obtained both for excited electrons and holes with energies up to 8 eV on a set of k vectors throughout the Brillouin zone (BZ). Strong localization effects in the c…
We demonstrate laser oscillation in a hexagonal-lattice photonic crystal nanocavity using an InGaAs quantum dot gain material by optical pumping at 5 K. The cavity comprises a defect created by shifting several air holes in a two-dimensional photonic crystal slab structure without removing any air holes to achieve bot…
We apply a simple dynamical density functional theory, the phase-field crystal (PFC) model of overdamped conservative dynamics, to address polymorphism, crystal nucleation, and crystal growth in the diffusion-controlled limit. We refine the phase diagram for 3D, and determine the line free energy in 2D and the height…
Abstract Transition metal oxides show fascinating physical properties such as high temperature superconductivity, ferro‐ and antiferromagnetism, ferroelectricity or even multiferroicity. The enormous progress in oxide thin film technology allows us to integrate these materials with semiconducting, normal conducting, d…
We investigate a phase-field-crystal model for homogeneous nucleation. Instead of obtaining the time evolution of a density field towards equilibrium, we use a string method to identify saddle points in phase space. The saddle points allow us to obtain the nucleation barrier and the critical nucleus. The advantage of…
Ultrasmall and highly soluble anatase nanoparticles were synthesized from TiCl(4) using tert-butyl alcohol as a new reaction medium. This synthetic protocol widens the scope of nonaqueous sol-gel methods to TiO(2) nanoparticles of around 3 nm with excellent dispersibility in ethanol and tert-butanol. Microwave heating…
A novel growth method (carbon molecular beam epitaxy (CMBE)) has been developed to produce high-quality and large-area epitaxial graphene. This method demonstrates significantly improved controllability of the graphene growth. CMBE with C(60) produces AB stacked graphene, while growth with the graphite filament result…
We discuss an efficient approach to excited electronic states within ab-initio many-body perturbation theory (MBPT). Quasiparticle corrections to density-functional theory result from the difference between metallic and non-metallic dielectric screening. They are evaluated as a small perturbation to the DFT-LDA band s…
Surface-initiated atom-transfer radical polymerization is used to synthesize particle brushes with controlled fraction of extended and relaxed conformations of surface-grafted chains. In the semidilute brush limit, the grafting of polymeric ligands is shown to facilitate the formation of ordered yet plastic-compliant…
Electronic properties of the graphene layer sandwiched between two hexagonal boron nitride sheets have been studied using the first-principles calculations and the minimal tight-binding model. It is shown that for the $ABC$-stacked structure in the absence of external field the bands are linear in the vicinity of the…
A facile one-step strategy has been developed for preparing monodisperse CeO(2) mesoporous spheres with high surface areas, uniform size distributions, and well-defined pore topologies. These mesoporous spheres have been demonstrated to be catalytically stable and active for CO oxidation.
Tensile loading and pullouts of individual multi-walled BNNTs were studied for the first time by in-situ tests in the integrated HRTEM-AFM setup. Most important mechanical parameters, such as the ultimate tensile strength and strain, maximum sustainable load and the Young’s modulus of tubes, were measured. Under paral…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTFrom Molecules to Systems: Sol−Gel Microencapsulation in Silica-Based MaterialsRosaria Ciriminna†, Marzia Sciortino†, Giuseppe Alonzo‡, Aster de Schrijver§, and Mario Pagliaro*†View Author Information Istituto per lo Studio dei Materiali Nanostrutturati, CNR, via U. La Malfa…
Nacre is the iridescent layer found inside a large number of mollusk shells. This natural composite has a very high mineral content, which makes it hard and stiff. However it is the toughness of nacre which is the most impressive: it is three orders of magnitude tougher than the mineral it is made of. No manmade compo…
Graphene as a substrate for enhancing Raman scattering, called graphene-enhanced Raman scattering (GERS), has been reported in previous work. Herein, it is found that the "first-layer effect", which is widely used to explain the chemical-enhanced mechanism in surface-enhanced Raman scattering (SERS), exists in the GER…
In this review, the emerging roles of group IV nanoparticles including silicon, diamond, silicon carbide, and germanium are summarized and discussed from the perspective of biologists, engineers, and medical practitioners. The synthesis, properties, and biological applications of these new nanomaterials have attracted…