New proton-conducting polymer electrolytes based on new porous films of polybenzimidazole doped with phosphoric acid have been obtained. The were prepared by leaching out a low-molecular-weight compound using selective solvent the porogen from polymer/porogen mixtures. This method allows control over porosity level up to porosities 75%. pore size and morphology strongly depend porogen/PBI ratio as observed SEM. varies <100 nm spherical shape for low very irregular interconnected structures...

The viability of using solution-processed CuSCN films as inorganic hole selective contacts in perovskite solar cells is demonstrated, by reaching a power conversion efficiency 6.4% planar heterojunction-based devices.

Sb2Se3 thin films are proposed as an alternative light harvester for semiconductor sensitized solar cells. An innovative electrodeposition route, based on aqueous alkaline electrolytes, is presented to obtain amorphous Sb2Se3. The crystalline phase transition takes place during a soft thermal annealing in Ar atmosphere. potential of the electrodeposited cells evaluated by preparing TiO2/Sb2Se3/CuSCN planar heterojunction resulting devices generate electricity from visible and NIR photons,...

A fundamental issue that remains to be solved when approaching the nanoscale is how size induces transformation among different polymorphic structures. Understanding size‐induced structures essential for widespread use of nanostructured materials in technological applications. Herein, we report water adsorption and high‐temperature solution calorimetry experiments on a set samples single‐phase monoclinic zirconia with surface areas. Essential success study has been new ternary...

Water-dispersible superparamagnetic iron oxide nanoparticles (SPIONs) were synthesized by thermal decomposition of iron(III) acetylacetonate in the presence triethylene glycol (TREG). The resulting TREG-coated SPIONs not stable, undergoing agglomeration and loss TREG coating under prolonged storage at 37 °C or increased saline concentrations. To avoid these problems, stable colloidal obtained two different procedures: (i) dimercaptosuccinic acid (DMSA) ligand-exchange reactions to obtain...

The thermodynamic properties of maghemite (γ-Fe2O3) nanoparticles with size smaller than 10 nm had not been studied previously because particle limitations for samples synthesized by wet chemical methods. Laser-induced pyrolysis is a well-established method producing sizes nm. Maghemite nanoparticles, obtained this and having range 2–40 nm, were fully characterized solution calorimetry. enthalpy water adsorption was also measured. surface from calorimetric data the hydrated 0.57 ± 0.10 J/m2...

Colloidal suspensions of iron oxide and metal nanoparticles prepared by laser pyrolysis have been obtained coating the particles with dextran in an aqueous media giving rise to biocompatible ferrofluids. The structural characteristics powders size aggregates colloidal analysed correlated magnetic properties both solids fluids. For first time, our knowledge, a stable ferrofluid based on (<10?nm) has aggregate sizes ?nm. In comparison products, this material exhibits higher saturation...

We present a method to produce superparamagnetic iron oxide/silica nanocomposites that have large BET surface area, high pore volume, and at least one size population centered around or larger than 10 nm. By means of this methodology, which is based on nanocasting techniques, we are able not only prepare mesoporous with adequate sizes magnetic properties for enzyme immobilization but also explore various phenomena associated the characteristics matrixes. Magnetic ordered mesostructured...

We have studied the magnetic behavior of superparamagnetic Fe nanocrystals (4--7 nm in diameter) dispersed submicron-sized spherical silica particles $(\ensuremath{\sim}150\mathrm{nm}$ diameter). Spherical composites that could be useful for biomedical applications were prepared by an aerosol-assisted method. M\"ossbauer studies allowed us to determine response must result a competition between intraparticle anisotropy and interparticle dipolar interactions. Evidence interacting (ISP) regime...

The transport properties of carbon dioxide, water, and different organic solvents in bacterial poly(3-hydroxybutyrate) (PHB) at 30°C were investigated. CO2 sorption was measured by the gravimetric method using a recording microbalance subatmospheric pressures. Results adequately interpreted terms Henry's law. Organic solvent water permeabilities for both vapors liquid cell. data depending on units which permeability measured. Most solvent-polymer systems showed typical time-lag plot, but...

hcp and fcc Co fine nanoparticles with different size have been synthesized by low-temperature laser pyrolysis reduction at temperatures from $200\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}550\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ of cobalt-oxide prepared the same method. The influence thermal treatment on crystal structure particles was examined. It found that below...

The nucleation and growth of water dispersible iron-oxide nanoparticles synthesized by high temperature decomposition iron(III) acetylacetonate in the presence different solvents has been studied. A battery techniques was used to characterize products obtained under conditions elucidate synthesis mechanism. Results show that triethylene glycol (TEG) proceeds through a multistep process whose first stage is likely be formation an intermediate TEG-iron-complex evolves into low-crystallinity...

Passivated iron nanoparticles (10-30 nm) have been synthesized by laser pyrolysis of a mixture pentacarbonyl and ethylene vapors followed controlled oxidation. The show well-constructed iron-iron oxide core-shell structure, in which the thickness nature (structure similar to maghemite, gamma-Fe2O3) shell is found be independent initial conditions. On other hand, composition core change with particle size from alpha-Fe structure highly disordered Fe phase (probably containing C atoms its...

Biocompatible magnetic dispersions have been prepared from γ-Fe2O3 nanoparticles (5 nm) synthesized by continuous laser pyrolysis of Fe(CO)5 vapours. The feasibility using these as resonance imaging (MRI) contrast agents has analysed in terms chemical structure, properties, 1H NMR relaxation times and biokinetics. were dispersed a strong alkaline solution the presence dextran, yielding stable colloids single step. consist particle-aggregates 25 nm diameter measured transmission electron...