Materials Literature
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We present a simple one-pot, one-step method to obtain stable and nearly monodisperse gold nanoparticles in dipolar aprotic solvents. Novel thiomethyl-functionalized polyphenylene dendrimers are used to control the growth and stabilize the nanoparticles in suspension. The dendrimer functionalized gold nanoparticles ha…
The pressure dependence of resistivity for the checkerboard-type charge-ordered (CO) molecular conductor $\ensuremath{\beta}\text{\ensuremath{-}}{(meso\text{-DMBEDT-TTF})}_{2}{\text{PF}}_{6}$ has been investigated. Under the low pressure of 0.6 kbar, the temperature of resistivity minimum $({T}_{\text{min}})$ falls fr…
Abstract Hyperbranched poly(ether nitrile)s were prepared from a novel AB 2 type monomer, 2‐chloro‐4‐(3,5‐dihydroxyphenoxy)benzonitrile, via nucleophilic aromatic substitution. Soluble and low‐viscous hyperbranched polymers with molecular weights upto 233,600 ( M w ) were isolated. According to the 1 H NMR and GPC dat…
Electron paramagnetic resonance (EPR) spectra of Gd(3+) ions in crystalline Ce(1-x-y)Gd(x)Y(y)O(2-[0.5*(x+y)]) (x=0.0025, y=0.10, and 0.25) with crystallite sizes ranging from 600 nm down to 5 nm have been measured at X-band and at Q-band near liquid He and room temperatures. The EPR line shape is controlled by the lo…
Abstract A workflow consisting of experiments, modeling, and synthesis is presented for managing the impurity content in the product crystals of a crystallization process taking into consideration the entire train of crystallization and downstream processing steps. Experiments on solid–liquid equilibrium, impurity inc…
Facettenreich: Die gezielte Synthese hochsymmetrischer niedermolekularer organischer Mikrokristalle mit Formen von Würfeln über angeschnittene Würfel zu rhombischen Dodekaedern (siehe Bild) gelang durch Änderungen in der Löslichkeit, die die Wachstumsgeschwindigkeit in 〈100〉-Richtung relativ zu der in 〈110〉-Richtung e…
In Ge2Sb2Te5 (GST), the prototype phase-change alloy for data storage, in situ x-ray diffraction experiments reveal a pressure-induced crystalline-amorphous-crystalline transition sequence, all at the same fixed composition and in one experimental cycle. A body-centered-cubic polymorph is discovered at high pressures;…
We theoretically performed that the magnetic moment of Ni-encapsulated B80 (Ni@B80) can be greatly tuned by changing the position of Ni atom inside the hollow cage of B80. There are three stable configurations of Ni@B80 with Ni atom located at center, pentagon, and hexagonal-in, respectively. Compared with that of Ni@…
Evaporation of WO 3.0 powder during transmission electron microscopy resulted in the formation of nanofibers of WO 2.9, which deposited on adjacent cooler regions of the carbon substrate. Controlled experiments using the inert gas condensation method were performed to investigate the formation mechanism of the nanofib…
Arsenic (As)-doped (1% to 3%) ZnO nanocrystalline films with the grain size of 20 nm have been grown on silicon substrates by pulsed laser deposition. X-ray diffraction analysis shows that the films are polycrystalline and exhibit the hexagonal wurtzite phase. The As dopant effects on lattice vibrations and electronic…
The atomic arrangement and segregation of Pr dopants at a ZnO [0001] $\ensuremath{\Sigma}49$ grain boundary were investigated by $Z$-contrast scanning transmission electron microscopy and first-principles calculations. Scanning transmission electron microscopy revealed that Pr selectively segregated at three kinds of…
The temperature and magnetic field dependence of angular dependent magnetoresistance (AMR) along two orthogonal directions ([100] and [01¯1]) was investigated in a charge-orbital-ordered Sm0.5Ca0.5MnO3 (SCMO) film grown on (011)-oriented SrTiO3 substrates. A dramatic decrease of AMR magnitude in both directions was ob…
This work investigates the influence of electron-phonon coupling associated with E tensor product of e and T tensor product of e Jahn-Teller (JT) effect in different transition-metal (TM) ions on de-excitation phenomena through nonradiative multiphonon relaxation, i.e., photoluminescence (PL) quenching. We developed a…
Despite its widespread application in nanomedicine, poly(ethylene glycol) (PEG) is seldom used for covalent modification of ligands for G protein-coupled receptors (GPCRs) due to potential steric complications. In order to study the influence of PEG chains on the biological activity of GPCR ligands bound to a common m…
Abstract Promoted ignition-combustion behavior has been used to describe a situation in which a substance with low oxygen compatibility ignites and supports the combustion of a more combustion-resistant material. Previous work has been reported on the investigation of this phenomenon as it relates to carbon steel, sta…
We both experimentally and theoretically study the effective optical properties of a Swiss cross metamaterial at oblique incidence and reveal their angular dependence. Almost perfect agreement between measured and calculated data is achieved. We show that the spectral and angular domains of negative refraction as well…
We study through experiments and associated simulations the electromagnetic response of microwave fishnet metamaterials and its dependence on the system's geometrical parameters. Our study verifies the validity of an earlier proposed inductor-capacitor (LC) circuit description of the fishnet design and reveals a left-…
To mimic the structure of the lotus leaf, we present a facile route to prepare superhydrophobic surfaces by depositing nanoparticle clusters onto a solid surface. These clusters were fabricated via solidification of an emulsion droplet containing a nanoparticle in silicone oil. Thus, the microsized clusters and nanopa…
As the Chairman of ALPEMA (Aluminum Plate-Fin Heat Exchanger Manufacturers' Association) since May 2008, I wish to announce the new third edition of the ALPEMA Standards for the construction of bra...
Pressure-induced structural changes in the canonical relaxor ${\text{Pb}}_{0.78}{\text{Ba}}_{0.22}{\text{Sc}}_{0.5}{\text{Ta}}_{0.5}{\text{O}}_{3}$ were studied with both in-house and synchrotron single-crystal x-ray diffraction as well as Raman spectroscopy at pressures up to 9.8 GPa. The results reveal that the subs…