Materials Literature
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Nitrogen-doped carbon nanotubes (NCNTs) have been catalytically synthesized from five different nitrogen-containing aromatic precursors by injection chemical vapor deposition (CVD) in the temperature range of 550–850 °C. The doped nitrogen mainly exists as pyridinic or graphitic nitrogen with the total content of 2–9…
The effective permittivity of CoFeSiB microwire/rubber composites is investigated in the microwave range of frequencies. As the frequency is varied between 0.3 and 6 GHz with or without magnetic field excitation, we identify a two-peak structure of the permittivity spectra. This spectral feature may be attributed to a…
Cockroach (Periplaneta americana) broth has been employed to assess its potential as a candidate source animal tissue for the synthesis of gold nanoparticles. The synthesis is performed akin to room temperature in the laboratory ambience. X-ray and transmission electron microscopy analyses are performed to ascertain t…
We present a technique to nanomechanically vary the distance between a fluorescent source and a mirror, thereby varying the local density of optical states at the source position. Our method can, therefore, serve to measure the quantum efficiency of fluorophores. Application of our technique to nitrogen-vacancy defect…
Einfach TOP: Die Koordination von Tri-n-octylphosphan (TOP) anstelle von Diphenylphosphan (DPP) an Cadmiumoleat (Cd(OA)2) macht deutlich, wie tertiäre und sekundäre Phosphane die Ausbeute und die Reproduzierbarkeit der Synthese von Nanokristallen verbessern, indem sie das Reaktionsgleichgewicht nach rechts verschieben…
A density functional theory (DFT) approach based on a weighted density approximation has been employed to study the perpendicular microphase separation of symmetric binary polymer brushes with weak incompatibility in explicit solvents with different selectivities. Characterized by the relation between the grand potent…
Sodium alanate (NaAlH 4 ) is the archetypical complex (ionic-covalent) hydride compound for hydrogen storage applications. However, the details of the reactions of this compound upon hydrogen cycling remain unclear. Recently, a new mobile aluminum-containing species termed S105 was discovered in the hydrogen chemistry…
The work aims to study the role of NBR-g-GMA compatibilizer on the morphology and mechanical characteristics of PET/PC/NBR ternary blends. The compatibilizer content and amount of constitutive polymers are changed to correlate morphology development with mechanical properties. Various ternary samples are prepared usin…
The exchange coupling of a single spin localized at the central ion of Cu-tetraazaporphyrin on a magnetite(100) surface has been studied using x-ray magnetic circular dichroism (XMCD). Sum rule analysis of the XMCD spectra results in Cu spin and orbital magnetic moments as a function of the applied external field at l…
We performed molecular dynamics simulations to investigate the transformation between collapsed and circular cross-sectioned single walled carbon nanotube (SWCNT). It is shown that, by tuning the surface energy of SWCNT via an external field, the shape of a SWCNT can be transformed from the collapsed form to circular…
Elastic and anelastic properties of poled and depoled single crystals of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 with compositions close to the morphotropic boundary have been investigated over the temperature range 5–700 K by resonant ultrasound spectroscopy (RUS) at frequencies of 0.1–1.2 MHz. Steep elastic softeni…
When Ho3+ ions are substituted at Sr2+ sites in SrTiO3 (STO), the excess positive charges are compensated via three complementary routes: (1) strontium vacancies, (2) titanium vacancies, and (3) conduction electrons. In this study, we show that the photoelectrochemical properties of Ho-doped STO films are dependent on…
Foams of polycaprolactone (PCL) and microbial polyester (poly-hydroxybutyrate-hydroxyvalerate, PHBV with 10% mol PHV) were produced by particulate leaching in an urea preform and subsequent preform dissolution in distilled water. Films were also cast to compare mechanical and shape memory performances. SEM observation…
Extremely efficient quenching of the excited state of aqueous CdTe quantum dots (QDs) by photoinduced electron transfer to a europium cyclen complex is facilitated by surface coordination to the thioglycolic acid capping ligand. The quenching dynamics are elucidated using steady-state emission and picosecond transient…
An in situ annealing stage has been developed in-house and integrated in the chamber of a Scanning Electron Microscope equipped with an Electron BackScattered Diffraction system. Based on the Joule effect, this device can reach the temperature of 1200°C at heating rates up to 100°C/s, avoiding microstructural evolutio…
CASSCF/CASPT2/RASSI quantum chemistry methods have been applied for the first time to model/compute kinetics of luminescence of Ag nanoclusters dispersed within the bulk of oxyfluoride glass. Namely the Ag 4 2+ tetramers have been investigated because they are argued to be dominant Ag nanoclusters in these glasses. Th…
The effect of the confinement in a single-wall carbon nanotube on the optical properties of β-carotene is studied at the time-dependent density functional theory level. A complex computational protocol has been developed, based on a multilayered ONIOM approach making use of a recent range-separated hybrid functional a…
Nanoparticles (NPs) have been proven to be an effective delivery system with few side effects for anticancer drugs. In this study, curcumin-loaded NPs have been prepared by an ionic gelation method using chitosan (Chi) and pluronic ® F-127 (PF) as carriers to deliver curcumin to the target cancer cells. Prepared NPs w…
In this study, the effect of acetic acid used as catalyst in promoting the decomposition rate of blowing agent (sodium bicarbonate) in epoxy foam was done. Hard epoxy foam was produced using mechanical mixing technique. Epoxy foam has been tested with adding acetic acid at 5 phr and different content of sodium bicarbo…
We systematically investigated the role of surface on the B2–B19 transformation of free-standing nanoparticles by classical molecular dynamics simulations. It was found that the surface of particles has a shell structure with a thickness of 2 unit cells, suppressing the B2–B19 transformation locally. Below a critical…