Search results for: A. Minguzzi

Items from 1 to 20 out of 31 results

article

Ad hoc tailored electrocatalytic MnO2 nanorods for the oxygen reduction in aqueous and organic media

S. Orsini, E. Pargoletti, A. Vertova, A. Minguzzi, more

Journal of Electroanalytical Chemistry > 2018 > 808 > C > 439-445

Metal-air batteries are one of the most promising electrochemical systems for energy storage and conversion. Herein we report promising results by exploiting manganese dioxide nanoparticles as ORR electrocatalysts. MnO₂ nanorods were prepared through a hydrothermal synthesis, i.e. by varying both the salt precursors (i.e. manganese sulphate or chloride) and the oxidizing agents (i.e. ammonium persulfate...

article

Quantum gases and quantum coherence

F. Chévy, R. Citro, A. Minguzzi, A. Recati, more

The European Physical Journal Special Topics > 2017 > 226 > 12 > 2693-2696

article

High-performance of bare and Ti-doped α-MnO2 nanoparticles in catalyzing the Oxygen Reduction Reaction

E. Pargoletti, G. Cappelletti, A. Minguzzi, S. Rondinini, more

Journal of Power Sources > 2016 > 325 > C > 116-128

Nanostructured MnO₂ has unique electrocatalytic properties towards the Oxygen Reduction Reaction (ORR, the main cathodic reaction in metal-air devices), representing an excellent alternative to the expensive platinum. Herein, we report the hydrothermal synthesis of bare and 5% Ti-doped α-MnO₂ nanoparticles using two different oxidizing agents, namely ammonium persulfate for MH_N samples and potassium...

article

Optimal scaling of persistent currents for interacting bosons on a ring

M. Cominotti, M. Rizzi, D. Rossini, D. Aghamalyan, more

The European Physical Journal Special Topics > 2015 > 224 > 3 > 519-524

We consider the persistent currents induced by an artificial gauge field applied to interacting ultra-cold bosonic atoms in a tight ring trap. Using both analytical and numerical methods, we study the scaling of the persistent current amplitude with the size of the ring. In the strongly interacting regime we find a power-law scaling, in good agreement with the predictions of the Luttinger-liquid theory...

article

Novel quantum phases and mesoscopic physics in quantum gases

F. Chevy, R. Citro, G. Lamporesi, A. Minguzzi, more

The European Physical Journal Special Topics > 2015 > 224 > 3 > 473-475

article

Novel quantum phases and mesoscopic physics in quantum gases

R. Citro, A. Minguzzi, E. Orignac, A. Recati, more

The European Physical Journal Special Topics > 2013 > 217 > 1 > 1-2

article

Superfluidity and Anderson localisation for a weakly interacting Bose gas in a quasiperiodic potential

X. Deng, R. Citro, E. Orignac, A. Minguzzi

The European Physical Journal B > 2009 > 68 > 3 > 435-443

Using exact diagonalisation and Density Matrix Renormalisation group (DMRG) approach we analyse the transition to a localised state of a weakly interacting quasi-1D Bose gas subjected to a quasiperiodic potential. The analysis is performed by calculating the superfluid fraction, density profile, momentum distribution and visibility for different periodicities of the second lattice and in the presence...

article

TiO2 nanocrystal particles and electrodes. The combined role of pH and metal substrate

S. Ardizzone, G. Cappelletti, A. Minguzzi, S. Rondinini, more

Journal of Electroanalytical Chemistry > 2008 > 621 > 2 > 185-197

In this work titania nanoparticles and layers, deposited onto metal supports (Ti and Au), have been prepared by combining a sol–gel precipitation with hydrothermal growth steps. This composite route implying also a final calcination at 300°C yields nanocrystalline anatase which shows the presence of electron trap sites localized within the band gap. The powders and layers are characterized for phase...

article

New electrocatalytic materials based on mixed metal oxides: electrochemical quartz crystal microbalance characterization

A. Vertova, L. Borgese, G. Cappelletti, C. Locatelli, more

Journal of Applied Electrochemistry > 2008 > 38 > 7 > 973-978

An electrochemical Quartz Crystal Microbalance (EQCM) was used to characterize a mixed metal oxide electrocatalyst, Ir_0.15Sn_0.85O₂, for the Oxygen Evolution Reaction (OER) in acidic medium in the potential range of the pseudo-capacitance reaction, from 0.4 to 1.2 V versus Reversible Hydrogen Electrode (RHE). The EQCM gold tip was characterized in H₂SO₄ 0.05 M and HClO₄ 0.1 M. Subsequently, Ir_0.15Sn...

article

Composite ternary SnO2–IrO2–Ta2O5 oxide electrocatalysts

S. Ardizzone, C.L. Bianchi, G. Cappelletti, M. Ionita, more

Journal of Electroanalytical Chemistry > 2006 > 589 > 1 > 160-166

Nanostructured, ternary SnO ₂ –IrO ₂ –Ta ₂ O ₅ composites have been studied as promising electrocatalytic materials for oxygen evolution reaction (OER) in acid water electrolysers. Both unsupported and Ti-supported powders of the general composition Sn _1−x−y Ir _x Ta _y O _2+2.5y (x=0, 0.03, 0.07, 0.15 and y=0, 0.07) have been prepared by...

article

Bulk, Surface and Morphological Features of Nanostructured Tin Oxide by a Controlled Alkoxide-Gel Path

M. Ionita, G. Cappelletti, A. Minguzzi, S. Ardizzone, more

Journal of Nanoparticle Research > 2006 > 8 > 5 > 653-660

SnO₂ particles and films were prepared by following a common sol–gel preparative route using tin (IV) alkoxide as the starting compound; the xerogels were thermally treated at 300, 500 and 700°C. The materials were characterized for phase composition-crystallinity, by X-ray diffraction, and for surface area and porosity, by N₂ adsorption isotherms. Both structural and morphological characterizations...

article

Numerical methods for atomic quantum gases with applications to Bose-Einstein condensates and to ultracold fermions

A. Minguzzi, S. Succi, F. Toschi, M.P. Tosi, more

Physics Reports > 2004 > 395 > 4-5 > 223-355

The achievement of Bose-Einstein condensation in ultra-cold vapours of alkali atoms has given enormous impulse to the study of dilute atomic gases in condensed quantum states inside magnetic traps and optical lattices. High-purity and easy optical access make them ideal candidates to investigate fundamental issues on interacting quantum systems. This review presents some theoretical issues which have...

article

Density profile of a Bose-Einstein condensate inside a pancake-shaped trap: observational consequences of the dimensional cross-over in the scattering properties

B. Tanatar, A. Minguzzi, P. Vignolo, M.P. Tosi

Physics Letters A > 2002 > 302 > 2-3 > 131-136

It is theoretically well known that two-dimensionality of the scattering events in a Bose-Einstein condensate introduces a logarithmic dependence on density in the coupling constant entering a mean-field theory of the equilibrium density profile, which becomes dominant as the s-wave scattering length gets larger than the condensate thickness. We trace the regions of experimentally accessible system...

article

High-momentum tail in the Tonks gas under harmonic confinement

A. Minguzzi, P. Vignolo, M.P. Tosi

Physics Letters A > 2002 > 294 > 3-4 > 222-226

We use boson-fermion mapping to show that the single-particle momentum distribution in a one-dimensional gas of hard point-like bosons (Tonks gas) inside a harmonic trap decays as p ^- ⁴ at large momentum p. The relevant integrals expressing the one-body density matrix are evaluated for small numbers of particles in a simple Monte Carlo approach to test the extent of the asymptotic law...

article

Collective Excitations of a One-Dimensional Fermi Gas Under Harmonic Confinement

A. Minguzzi, P. Vignolo, M. L. Chiofalo, M. P. Tosi

Journal of Low Temperature Physics > 2002 > 126 > 1-2 > 443-448

We study the spectrum of collective excitations of a spin-polarized Fermi gas confined in a one-dimensional harmonic trap at zero temperature. In the collisionless regime we evaluate exactly the dynamic structure factor, while in the collisional regime we solve analytically the linearized equations of hydrodynamics in the Thomas-Fermi approximation. We also verify the validity of the Thomas-Fermi...

article

Momentum distribution of Bose-condensed atomic hydrogen

P. Vignolo, A. Minguzzi, M.P. Tosi

Physics Letters A > 2001 > 289 > 6 > 333-336

We evaluate the kinetic energy and the momentum distribution of a Bose-condensed cloud of hydrogen gas inside a Ioffe-Pritchard trap, using a semiclassical two-fluid approach. The relationship between temperature and mean kinetic energy of the gas depends sensitively on the shape of the confining potential.

article

Collective excitations in confined Fermi gases

A. Minguzzi, M.P. Tosi

Physica B: Physics of Condensed Matter > 2001 > 300 > 1-4 > 27-37

The techniques which have led to the achievement of Bose-Einstein condensation in atomic vapours are being used to trap and cool dilute gases of fermionic alkali atoms, with the ultimate aim of realizing new superfluid systems. We present a short review of progress in evaluating collective excitations of small amplitude in degenerate Fermi gases under harmonic confinement, both in the normal and in...

article

Kinetic energy functional for Fermi vapors in spherical harmonic confinement

A. Minguzzi, N.H. March, M.P. Tosi

Physics Letters A > 2001 > 281 > 2-3 > 192-196

Two equations are constructed which reflect, for fermions moving independently in a spherical harmonic potential, a differential virial theorem and a relation between the turning points of kinetic energy and particle densities. These equations are used to derive a differential equation for the particle density and a non-local kinetic energy functional.

article

Dynamic structure factor of a superfluid Fermi gas

A. Minguzzi, G. Ferrari, Y. Castin

The European Physical Journal D > 2001 > 17 > 1 > 49-55

Abstract: We describe the excitation spectrum of a two-component neutral Fermi gas with attractive interactions in the superfluid phase at finite temperature by deriving a suitable Random-Phase approximation in the collisionless regime with the technique of functional derivatives. The obtained spectrum for the homogeneous gas at small wavevectors contains the Bogoliubov-Anderson phonon and is essentially...

article

Particle density and non-local kinetic energy density functional for two-dimensional harmonically confined Fermi vapors

A. Minguzzi, N.H. March, M.P. Tosi

The European Physical Journal D > 2001 > 15 > 3 > 315-320

Abstract: We evaluate analytically some ground state properties of two-dimensional harmonically confined Fermi vapors with isotropy and for an arbitrary number of closed shells. We first derive a differential form of the virial theorem and an expression for the kinetic energy density in terms of the fermion particle density and its low-order derivatives. These results allow an explicit differential...

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Search results for: A. Minguzzi

Ad hoc tailored electrocatalytic MnO2 nanorods for the oxygen reduction in aqueous and organic media

Quantum gases and quantum coherence

High-performance of bare and Ti-doped α-MnO2 nanoparticles in catalyzing the Oxygen Reduction Reaction

Optimal scaling of persistent currents for interacting bosons on a ring

Novel quantum phases and mesoscopic physics in quantum gases

Novel quantum phases and mesoscopic physics in quantum gases

Superfluidity and Anderson localisation for a weakly interacting Bose gas in a quasiperiodic potential

TiO2 nanocrystal particles and electrodes. The combined role of pH and metal substrate

New electrocatalytic materials based on mixed metal oxides: electrochemical quartz crystal microbalance characterization

Composite ternary SnO2–IrO2–Ta2O5 oxide electrocatalysts

Bulk, Surface and Morphological Features of Nanostructured Tin Oxide by a Controlled Alkoxide-Gel Path

Numerical methods for atomic quantum gases with applications to Bose-Einstein condensates and to ultracold fermions

Density profile of a Bose-Einstein condensate inside a pancake-shaped trap: observational consequences of the dimensional cross-over in the scattering properties

High-momentum tail in the Tonks gas under harmonic confinement

Collective Excitations of a One-Dimensional Fermi Gas Under Harmonic Confinement

Momentum distribution of Bose-condensed atomic hydrogen

Collective excitations in confined Fermi gases

Kinetic energy functional for Fermi vapors in spherical harmonic confinement

Dynamic structure factor of a superfluid Fermi gas

Particle density and non-local kinetic energy density functional for two-dimensional harmonically confined Fermi vapors

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