Materials Literature
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A major obstacle in the realization of commercially viable single-walled carbon nanotube (SWNT) devices, hindering the functionality of this uniquely interesting type of material, is their type and site selective integration. Specifically, SWNT based piezoresistive pressure sensors require the incorporation of individ…
Abstract In this article, according to the concept of “suitable isolation group,” six new AB 2 ‐type polytriazoles containing azo‐chromophore moieties, derived from the same hyperbranched polymer intermediate, were successfully prepared through click reaction under copper(I) catalysis by modifying the synthetic route,…
Abstract Atomic hopping processes on ceria nanoparticle surfaces are observed by in situ phase contrast high‐resolution electron microscopy with an aberration‐corrected imaging lens. It is shown that single‐atom resolution is possible, and single‐atom dynamics for cerium are observable. Discrete changes in contrast an…
The converse magnetoelectric effect (CME) of a 2-mm-thick Pb(Zr0.52Ti0.48)O3 (PZT)/Tb0.30Dy0.7Fe2 (Terfenol-D)/PZT laminate subjected to an applied dc voltage bias has been investigated. Experimental data demonstrate that the CME coefficient αCME (B/Vac)is highly dependent on the applied voltage bias. In the present w…
Site-isolated Ti(IV) centers were introduced onto the surface of a mesoporous SBA-15 support via the thermolytic molecular precursor method. Prior to thermal treatment to generate Ti−OH sites, residual silanol groups were capped via reaction with Me 2 N-SiMe 3 to give TiMe cap SBA15 . After low temperature treatment i…
This ab initio study was performed to better understand the correlation between intercalated water molecules and layered double hydroxides (LDH), as well as the changes that occur by the dehydration process of Zn-Al hydrotalcite-like compounds containing Cl⁻ and CO₃²⁻ counterions. We have verified that the strong inte…
Mn-doped PbZr0.52Ti0.48O3 (PZT) films were utilized to study the effect of acceptor dopant concentration on the mobility of ferroelectric domain walls. For chemical solution deposited PZT films between ∼0.5–2μm in thickness doped with 1–2mol.% Mn, the low field relative permittivity remained between 900 and 1000. With…
Single-phase vanadium dioxide films grown on (0001) sapphire and (001) silicon substrates show a very different insulator–metal electronic transition. A detailed description of the growth mechanisms and the substrate–film interaction is given, and the characteristics of the electronic transition are described by the m…
Off-lattice computer simulations of polyelectrolyte brushes are carried out using the Debye approximation with explicit counterions but implicit salt. The results are compared with explicit salt ion simulations and self-consistent field theory. We demonstrate that the data generated with these different techniques are…
The optical properties of Yb3+ and Tm3+ co-doped Y2BaZnO5, synthesized by solid-state reaction, are investigated in detail. Three main emission bands centered around 479 nm (blue), 654 nm (red), and 796 nm (near-infrared) are observed under near-infrared laser excitation via an upconversion process. Detailed studies o…
Highly c-axis oriented ZnO thin films have been deposited on silicon substrates by planar rf magnetron sputtering under varying pressure (10–50 mTorr) and oxygen percentage (50–100%) in the reactive gas (Ar + O2) mixture. The as-grown films were found to be stressed over a wide range from −1 × 1011 to −2 × 108 dyne/cm…
The incorporation of nanoparticles into polymer matrices increases reinforcement and leads to stronger plastics. However, controlling the spatial distribution of nanoparticles within polymer matrices is a challenge in improving the properties of polymer nanocomposite. Dissipative particle dynamics simulations are empl…
Two copper(II) complexes, 1 and 2 with L(1) and L(2) [L(1) = 2- aminomethyl pyridine; L(2) = bis-(2-aminoethyl)amine], respectively, in degassed acetonitrile solvent, on exposure to NO gas, were found to form a thermally unstable [Cu(II)-NO] intermediate which then resulted in the reduction of the copper(II) centers.…
As a superhard material with properties similar to diamond including chemical inertness, cubic boron nitride (cBN) is an excellent candidate as a pressure calibration standard for high-temperature high-pressure research using its pressure-volume-temperature (P-V-T) equation of state. However, the elastic properties of…
We demonstrate experimentally the existence of triple twins in Ni-Mn-Ga magnetic shape memory single crystals with a modulated five-layered martensite structure using optical observations andx-ray diffraction. Subsequently, we investigate the response of the crystals with triple-twin segments to compressive loading up…
Inelastic neutron scattering experiments and molecular dynamics simulations have been used to investigate the low frequency modes, in the region between 0 and 100 meV, of hydration water in selected hydrophilic and hydrophobic biomolecules. The results show changes in the plasticity of the hydrogen-bond network of hyd…
BACKGROUND: Cytotoxic drugs are non-selective between normal and pathological tissue, and this poses a challenge regarding the strategy for treatment of tumors. To achieve sufficient antitumor activity for colorectal carcinoma, optimization of the therapeutic regimen is of great importance. We investigated the ability…
Abstract Functionalizing aliphatic polyester hydrogels with an aniline oligomer is a means of achieving electrically conductive and degradable hydrogels. To lower the aniline oligomer content while maintaining a high conductivity and to overcome the acidic degradation product from polylactide reported in our previous…
We demonstrate cathodes for solid acid fuel cells fabricated by vapor deposition of platinum from the metalorganic precursor Pt(acac) 2 on the solid acid CsH 2 PO 4 at 210 °C. A network of platinum nanoparticles with diameters of 2−4 nm serves as both the oxygen reduction catalyst and the electronic conductor in the e…
Palladium nanoparticles (Pd NPs) capped with a certain protective group possessing stable reactivity of Pd-catalyzed reactions has been quickly and easily synthesized. The thiol−Pd 2+ complexes of C 12 −Pd 2+ and POSS−Pd 2+ are prepared by the ligand exchange of acetate groups on Pd(OAc) 2 with 1-dodecanthiol and SH-P…