Materials Literature
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BACKGROUND: Targeted magnetic resonance contrast agents have enabled the imaging of biological processes in vivo, and current insights have opened up new perspectives for the monitoring and diagnosis of many diseases. PURPOSE: To develop a contrast agent for targeting somatostatin receptors (SSTRs) expressed on breast…
This paper deals with the analysis of nanoparticles polymerized in nitrogen/acetylene and argon/acetylene gas mixtures in low temperature rf discharges. The polymerization process was monitored by means of mass spectroscopy. The chemical characteristics of the material were obtained in situ by infrared absorption spec…
Abstract The corrosion and electrochemical behaviors of pure aluminum in KOH‐ionic liquid‐water solutions with variable volume ratios of water and the ionic liquid 1‐butyl‐3‐methyl imidazolium tetrafluoroborate (BMIMBF 4 ) were for the first time investigated by means of hydrogen collection, polarization curve, galvan…
Rare earth doped opaque aluminum tellurite ceramics exhibiting multicolor upconversion and color tunability have been synthesized and characterized. The multicolor fluorescence comprises of green, red, and blue upconversion emissions from Ho3+ and Tm3+ ions. By varying the intensity ratios between the upconversion emi…
Materials based on rare-earth and iron have drawn much attention due to their high performance properties for permanent magnet application. Substitution of Fe by a transition metal remains of considerable interest owing to the relatively modest magnetic properties of the binary Sm–Fe compounds. The structure of the na…
Abstract [C 4 mim][Tb(hfacac) 4 ] ( 1 ) and [C 4 mpyr][Tb(hfacac) 4 ] ( 2 ) (C 4 mim = 1‐butyl‐3‐methylimidazolium, C 4 mpyr = N ‐butyl‐ N ‐methylpyrrolidinium) were obtained by reacting [C 4 mim]Cl (for 1 ) or [C 4 mpyr]Br (for 2 ) with (hexafluoroacetyl)acetone and terbium(III) chloride in a basic ethanol/water solu…
The electronic thermal transport in metallic nanofilms has been extensively studied. There are, however, rare reports on the influence of phonon on the thermal and electrical transports in metallic films. In the present work, equilibrium molecular dynamics with embedded-atom method is used to investigate the lattice t…
Stable configuration, electronic structures, and magnetic behaviors for S adsorption on graphene have been investigated by first-principles calculations. It is found that the adsorption site of S on graphene is coverage dependent. As the increase in coverage from 0 to 0.5 ML, the preferred site is changed from bridge…
We report on polarization-dependent transient carrier dynamics and coherent phonon oscillations in single-walled carbon nanotubes by determining the relation between the nanotube axis and the incident light polarization. Due to the anisotropic shape of nanotubes, optical absorption strongly depends on the polarization…
Photochromic unsymmetrical diarylethenes 1a–5a that bear different electron-donating or electron-withdrawing substitutes have been synthesized, and the structures of 2a–5a determined by single-crystal X-ray diffraction analysis. Substituent effects on their optoelectronic properties, including photochromism, fluoresce…
We have studied the fracture, strain, and stress of electrophoretically deposited (EPD) films of CdSe nanocrystals as a function of the film thickness, nanocrystal size, and drying method. Fracture results from the film stress that develops with the loss of residual solvent after EPD when the film exceeds a threshold…
We demonstrate an efficient and accurate first-principles method to calculate the electronic structure of a large system using a divide-and-conquer strategy based on localized quasi-atomic minimal basis set orbitals recently developed. Tight-binding Hamiltonian and overlap matrices of a large system can be constructed…
Abstract The creep behavior and creep failure law of polypropylene (PP) were investigated by using a multifunctional stress‐aging testing machine under different aging environmental conditions (temperature, UV, and stress). Photoinduced changes in samples were studied using gel permeation chromatography and X‐ray phot…
Abalone shell is natural inorganic/organic hybrid material, which is biologically constructed by using two calcium carbonates, aragonite and calcite. Aragonite can provide an enhanced mechanical support for the shell, and the stable phase, calcite, acts as the outer layer. In the current study, large-area aragonite fi…
A novel method is presented for manipulation of a single nanoparticle using a carbon nanotube probe in a scanning electron microscope chamber. Nanomanipulation was achieved without dependence on the conductivity of the nanoparticle. In order to demonstrate the effectiveness of this technique, insulative Fe 2 O 3 and c…
We investigated the single crystals of LiBaF(3) doped with Eu(2+) using high pressure spectroscopy, where high pressure was applied in a diamond anvil cell. Photoluminescence, time-resolved luminescence and luminescence kinetics at pressures from ambient to 200 kbar and at temperatures from 10 K to ambient were studie…
Graphene is the first example of a truly two-dimensional crystal. This opens many interesting directions of research concerning the thermodynamics, lattice dynamics, and structural properties of such systems. Being a gapless semiconductor with a linear energy spectrum, single-layer graphene realizes a two-dimensional,…
In this work we present a rational design of the active part of third generation photosensitizers for photodynamic therapy based on phthalocyanine and an azaphthalocyanine core. The preferred zinc complexes of the AAAB type that contain bulky tert-butylsulfanyl substituents (A) and one carboxy group (B) have been synt…
To adapt electron tomography for the specific study of specimen morphology, a novel reconstruction algorithm is proposed which treats strong intensity gradients in images as arising from the projected edges of surfaces. Images portraying scattering interfaces arising from absorption, elastic, or Fresnel diffraction pr…
We show that in nontypical ferroelectric substances (having nonperovskite crystalline structure and hence no soft phonon mode) such as ZnO:Li, Be, Mg, the ferroelectricity might appear due to indirect interaction of dipoles, formed by Li, Be, or Mg off-center impurities, via free charge carriers. Our estimations show…