Materials Literature
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Ferroelectromagnets - compounds with ferroelectric and magnetic orderings - were discovered about fifty years ago. They are of great interest due to the possibility of mutual control of electric (magnetic) properties by magnetic (electric) field. At present such possibility of magnetoelectric control has become realit…
Hot carrier solar cells allow potential efficiency close to the thermodynamical limit in ideal conditions. However, the feasability of such devices has not been clearly stated so far and only ideal cells were considered in previous studies. Here we develop a model with realistic energy selective contacts, carrier ther…
In this article, we investigate numerical schemes for solving a three component Cahn-Hilliard model. The space discretization is performed by using a Galerkin formulation and the finite element method. Concerning the time discretization, the main difficulty is to write a scheme ensuring, at the discrete level, the dec…
Alginate microbeads with iron oxide nanoparticle heaters that carry doxo-rubicin are investigated in vitro for simultaneous drug targeting and local heat generation (hyperthermia). Application of an alternative magnetic field (AMF) causes magnetic-hyperthermia-enhanced doxorubicin release. The AMF-triggered drug relea…
The luminescence of quantum-sized metal clusters has enthralled the scientific community in recent years. In this study, ultrafast luminescence dynamics of hexanethiol (C 6 S)- and glutathione (GS)-protected Au 25 clusters are investigated with time-resolved luminescence spectroscopy. The focus of the present investig…
We report on the effect of germanium (Ge) coatings on the thermal transport properties of silicon (Si) nanowires using nonequilibrium molecular dynamics simulations. Our results show that a simple deposition of a Ge shell of only 1 to 2 unit cells in thickness on a single crystalline Si nanowire can lead to a dramatic…
The thermally induced transformation of kaolinite to metakaolin is simulated using molecular dynamics through a step-wise dehydroxylation approach. The simulation shows that the removal of structural water through dehydroxylation produces a distortion or buckling effect in the 1 : 1 Al–Si layers, which is due to the m…
We have synthesized a fused tetraanthracenylporphyrin by oxidation of a meso-anthracenyl nickel(II) porphyrin with FeCl(3). This compound exhibits an intense red-shifted absorption spectrum (λ(max) = 1417 nm; ε = 1.2 × 10(5) M(-1) cm(-1)) and a small electrochemical HOMO-LUMO gap (0.61 eV). The crystal structure shows…
In recent experiments (Chmiola et al 2006 Science 313 1760; Largeot et al 2008 J. Am. Chem. Soc. 130 2730) an anomalous increase of the capacitance with a decrease of the pore size of a carbon-based porous electric double-layer capacitor has been observed. We explain this effect by image forces which exponentially scr…
Heteronanostructured photoelectrodes were fabricated by atomic layer deposition of WO3 and stabilized with an Mn-based oxygen-evolving catalyst. The resulting electrode absorbs photons to create electrons and holes, the separation of which is assisted by the built-in field within the semiconductor. Electrons are colle…
Graphene field effect transistors (FETs) are extremely sensitive to gas exposure. Charge transfer doping of graphene FETs by atmospheric gas is ubiquitous but not yet understood. We have used graphene FETs to probe minute changes in electrochemical potential during high-purity gas exposure experiments. Our study shows…
If the cap fits: Attachment of collagen (Col) to silica nanoparticles (MSN) by a disulfide linker, followed by introduction of lactobionic acid (LA, a cell-specific targeting moiety), results in a redox-responsive system for cell-specific intracellular drug delivery and efficient endocytosis (see picture). Controlled…
Development of durable non-wetting surfaces is hindered by the fragility of the microscopic roughness features that are necessary for superhydrophobicity. Mechanical wear on superhydrophobic surfaces usually shows as increased sticking of water, leading to loss of non-wettability. Increased wear resistance has been de…
Abstract We conducted this study to examine the changes in the molecular structure and physiological activities of silk sericin after γ irradiation. Sericin from Bombyx mori was extracted with an Na2CO3 solution. The molecular weight distribution of sericin increased in the gel permeation chromatography and sodium dod…
In this paper, the relative importance of effective parameters such as the activity coefficient, thermal decomposition and pH of chemical additives is investigated on the control procedure of ZnO nanoparticle growth. It is found that the activity coefficient is of greater importance compared with other parameters and…
The diarylethene derivative 1,2-bis-(5'-dimesitylboryl-2'-methylthieny-3'-yl)-cyclopentene (1) containing dimesitylboryl groups is an interesting photochromic material. The dimesitylboryl groups can bind to F(-), which tunes the optical and electronic properties of the diarylethene compound. Hence, the diarylethene de…
Fibras naturais têm sido empregadas em diversos compósitos, principalmente na indústria automobilística. Dentre as diversas fibras naturais, a fibra de curauá é atraente por apresentar elevada propriedade mecânica associada a baixos valores de densidade. Neste trabalho a fibra de curauá é modificada quimicamente pelo…
The sheltered transfer and immobilization of rabbit anti-human antiserum immunoglobulin G (IgG) by matrix-assisted pulsed laser evaporation (MAPLE) are reported. The iced targets submitted to laser irradiation consisted of 0.2-2 mg/mL IgG blended or not with lipid (L-α-phosphatidylcholine dipalmitoyl) dissolved in dis…
Abstract Time‐resolved luminescence measurements have been carried out for PbMoO 4 crystals with the scheelite structure. A fast‐decaying luminescence band with a lifetime of the order of 10 ns is observed at 400 nm at low temperatures ( T < 170 K). This luminescence is tentatively assigned to the radiative transit…
The adsorption mechanisms of O 2 on a Si(111)-7 × 7 surface were studied using real-time X-ray photoelectron spectroscopy with synchrotron radiation in conjunction with a supersonic molecular-beam technique. To study the dependence of the initial sticking probability, s 0, saturation coverage of the O 2 incident energ…