Materials Literature
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In a conventional solar cell, the energy of an absorbed photon in excess of the band gap is rapidly lost as heat, and this is one of the main reasons that the theoretical efficiency is limited to ~33%. However, an alternative process, multiple exciton generation (MEG), can occur in colloidal quantum dots. Here, some o…
Models and theories to explain the Hall–Petch relationship are reviewed briefly. Then, a dislocation model to incorporate some characteristic mechanical properties of ultrafine-grained and nanocrystalline metals will be introduced and used to explain some experimental results. The model is based on the idea that dislo…
Abstract For the application of single‐layer food packaging films with improved barrier properties, an attempt was made to prepare ethylene‐vinyl alcohol (EVOH) copolymer‐based nanocomposite films by incorporation of organically modified montmorillonite nanoclays via a two‐step mixing process and solvent cast method.…
Eu-doped pollucite CsAlSi2O6 was synthesized by the sol-gel method and heated in an air atmosphere. The crystal structure and the microstructure of the phosphors were investigated by X-ray powder diffraction and SEM images, respectively. The photoluminescence spectra and temperature dependent decay curves were measure…
In this work we show, that atomic metallic hydrogen (AMH) is formed inside of sintered oxide-nickel electrodes of nickel-cadmium battery over a long period of electrochemical hydrogenation (more than five years). It was established that density AMH is 12 times higher, than the density of liquid molecular hydrogen, the…
A comprehensive mechanistic study conducted on the formation mechanism of five-fold twinned copper nanowires by heating copper(I) chloride with oleylamine at 170 °C is presented. Electron microscopy and UV-visible absorption spectra are used to analyze the growth mechanism of copper nanowires. High-resolution transmis…
A branchlike MoO3/polypyrrole conductive nanocomposite was facilely prepared by wrapping a homogeneous polypyrrole (PPy) layer around MoO3 nanobelts via the in situ oxidative polymerization of a self-assembled pyrrole monomer. X-ray powder diffraction characterization demonstrated that the PPy polymer does not hinder…
We report on the self-assembly of colloidal CdSe nanoplatelets into micrometers long anisotropic needle-like superparticles (SPs), which are formed in solution upon addition of an antisolvent to a stable colloidal dispersion. Optical fluorescence microscopy, transmission electron microscopy, and small-angle X-ray scat…
A series of amphiphilic tyrosine based self-healable, multi-stimuli responsive metallo-hydrogels have been discovered. Formation of these hydrogels is highly selective to Ni(2+) ions. The self-healing property and the stiffness of these metallo-hydrogels can be tuned by varying the chain length of the corresponding ge…
Surface enhanced Raman spectroscopy (SERS) is a powerful spectroscopic technique capable of detecting trace amounts of chemicals and identifying them based on their unique vibrational characteristics. While there are many complex methods for fabricating SERS substrates, there has been a recent shift towards the develo…
This article reviews the mechanisms through which molecules adsorbed to the surfaces of semiconductor nanocrystals, quantum dots (QDs), influence the pathways for and dynamics of intra- and interband exciton relaxation in these nanostructures. In many cases, the surface chemistry of the QDs determines the competition…
Whether a quantum critical point (QCP) lies beneath the superconducting dome has been a long-standing issue that remains unresolved in many classes of unconventional superconductors, notably cuprates, heavy fermions, and, most recently, iron pnictides. The existence of a QCP may offer a route to understanding the orig…
Ternary two-dimensional dichalcogenide alloys exhibit compositionally modulated electronic structure, and hence, control of dopant concentration within each individual layer of these compounds provides a powerful tool to efficiently modify their physical and chemical properties. The main challenge arises when quantify…
When nematic liquid crystals are embedded in random polymer networks, the disordered environment disrupts the long-range order, producing a glassy state. If an electric field is applied, it induces large and fairly temperature-independent orientational order. To understand the experiments, we simulate a liquid crystal…
Phosphoglycerate mutase (PGM) is a key enzyme in carbohydrate metabolism. It takes part in both glycolysis and gluconeogenesis. PGM from pathogenic Staphylococcus aureus (NCTC8325) was cloned in pQE30 expression vector overexpressed in Escherichia coli M15 (pREP4) cells and purified to homogeneity. The protein was cry…
This work addresses the properties of Barium-Strontium-Titanate based thick-film varactors at conditions that are expected to arise when the varactors are integrated in a packaged RF power transistor i.e. varying thermal conditions in combination with large fields and high power larger than 30dBm. The varactors are ch…
Non-spherical Gold Nanoparticles (AuNPs), with unique geometries properties, have become the new exciting focus of applications in tumor imaging and therapy recently. In this review, we summarized the properties and applications of non-spherical AuNPs for cancer imaging and therapy. We review four typical shapes of no…
ABSTRACT A new method is presented to characterize absorbing materials, based on a classical Line‐Line method but more nondestructive and more convenient. This modified Line‐Line technique is used to characterize polymer/carbon nanotubes composite foams. The advantages and limitations of this technique are highlighted…
The electromagnetic properties of graphene are neither well known nor well understood. Therefore, the aim of this paper is to present them in a coherent manner. We present first the graphene coplanar waveguide and its properties, and describe afterwards experiments involving these coplanar waveguides that are able to…
Preparation of helical polymers designed for mimicking biological helices and developing supramolecular helical assemblies with a controlled helix sense still remains a major challenge. A previously unknown superhelical structure constructed by achiral random copolymer poly( N -vinylcarbazole) (PVK) with pendant azobe…