Materials Literature
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We report the electronic structure of the iron-chalcogenide superconductor, ${\text{Fe}}_{1.04}({\text{Te}}_{0.66}{\text{Se}}_{0.34})$, obtained with high-resolution angle-resolved photoemission spectroscopy and density-functional calculations. In photoemission measurements, various photon energies and polarizations a…
We demonstrate coaxial atomic force microscope (AFM) tweezers that can trap and place small objects using dielectrophoresis (DEP). An attractive force is generated at the tip of a coaxial AFM probe by applying a radio frequency voltage between the center conductor and a grounded shield; the origin of the force is foun…
Driven non-equilibrium structural phase transformation has been probed using time varying resistance fluctuations or noise. We demonstrate that the non-Gaussian component (NGC) of noise obtained by evaluating the higher order statistics of fluctuations, serves as a simple kinetic detector of these phase transitions. U…
Abstract Using isothermal and temperature‐dependent electrical measurements, we investigated the resistive switching mechanism of amorphous titanium oxide thin films deposited by plasma enhanced atomic layer deposition (PEALD) between two aluminum electrodes. We found a bipolar resistive switching (BRS) behavior only…
Abstract We report on low‐energy electron microscopy imaging of ferroelectric domains with submicron resolution. Periodic strips of ‘up’ and ‘down’‐polarized ferroelectric domains in bismuth ferrite – a room temperature multiferroic – serve as a model system to compare low‐energy electron microscopy with the establish…
Intermolecular interactions of coronene dimer were studied with symmetry-adapted perturbation theory based on the density functional theory description of the monomers [SAPT(DFT)]. The most stable stacked structure was found to have the interaction energy of -17.45 kcal/mol, slightly lower than the structure analogous…
Polyelectrolyte microcapsules were prepared by the layer-by-layer assembly of hyaluronic acid (HA) and a polycationic polymer, poly(allylamine) (PAH) or poly(lysine) (PLL). The influence of the polycationic partner on the morphology, stability, permeability properties, and enzymatic degradation of microcapsules was th…
AIMS: To determine the antibacterial potential of silver nanoparticles (AgNps) synthesized by tea leaf extract against Vibrio harveyi and its protective effect on juvenile Feneropenaeus indicus. METHODS AND RESULTS: AgNps were synthesized by a simple procedure using tea leaf extract as the reducing agent. Bacteriologi…
We report investigation of the piezoelectric response on a nanoscale in poled ferroelectric crystals with engineered domain configuration. Piezoresponse force microscopy of the (111) surface of a ($⟨111⟩$-poled) tetragonal $0.63\text{Pb}({\text{Mg}}_{1/3}{\text{Nb}}_{2/3}){\text{O}}_{3}\text{\ensuremath{-}}0.37{\text{…
Low-energy electron microscopy (LEEM) images of nine atomic layers of Mg on Ru (0001) before and after exposing to atomic H. The mechanisms of magnesium hydride formation and thermal decomposition are directly examined using in situ imaging.
We present a new approach to study the magnetic phase stability of magnetic overlayers on nonmagnetic substrates. The exchange integrals among magnetic atoms in the overlayer are estimated in the framework of the adiabatic approximation and used to construct the effective classical two-dimensional Heisenberg Hamiltoni…
The Becke-Johnson exchange potential [J. Chem. Phys. 124, 221101 (2006)] has been successfully used in electronic structure calculations within density-functional theory. However, in its original form the potential may dramatically fail in systems with non-Coulombic external potentials, or in the presence of external…
The electron-phonon(e-p) interaction in Pentacene (Pn) films grown on Bi(001) was investigated using photoemission spectroscopy. The spectra reveal thermal broadening from which we determine an e-p mass enhancement factor of lambda = 0.36 +/- 0.05 and an effective Einstein energy of omega_E = 11 +/- 4 meV. From omega_…
We study the effect of insulating oxide substrates on the energy band structure of monolayer and bilayer graphene using a first principles density functional based electronic structure method and a local exchange correlation approximation. We consider two crystalline substrates, SiO2 (or alpha-quartz) and Al2O3 (alpha…
We present here molecular dynamics simulations of deeply supercooled SPC/E water confined in a cylindrical pore of MCM-41 silica material. By a layer analysis of the tag particle density correlators, we are able to extract the α-relaxation time of the mobile portion of the confined water. This relaxation time is the s…
A method was developed for the preparation of microcapsules containing a reactive amine with potential applications in self-healing polymers. Amine core microcapsules were prepared by interfacial polymerization of an isocyanate and an amine stabilized by an inverse Pickering emulsion. Microcapsules were successfully i…
Effects of hydration on silk fibroin film properties were investigated for water-annealed and MeOH-treated samples. Hydration increased thickness by 60% for MeOH-immersed films, while water-annealed samples remained constant. MeOH-immersed films showed an 80% mass loss due to water, while water-annealed lost only 40%.…
The oxidative dissolution of silver nanoparticles (AgNPs) plays an important role in the synthesis of well-defined nanostructured materials, and may be responsible for their activities in biological systems. In this study, we use stopped-flow spectrophotometry to investigate the kinetics and mechanism of the oxidative…
This Perspective summarizes the recent advances and perspective in three-dimensional (3D) imaging techniques and their applications to polymer nanostructures, e.g., microphase-separated structures of block copolymers. We place particular emphasis on the method of transmission electron microtomography (TEMT). As a resu…
The study of clusters has provided a tangible link between local geometry and bulk condensed matter, but experiments have not yet systematically explored the thermodynamics of the smallest clusters. Here we present experimental measurements of the structures and free energies of colloidal clusters in which the particl…