Dr. Maurizio Vignolo

SCITEC Genova, National Research Council, Rome, Lazio, Italy

Dr. Maurizio Vignolo

SCITEC Genova, National Research Council, Rome, Lazio, Italy

Co-authors

Following

Followers

Research Focus & Metrics

Explore full metrics on Scilit

Academic Career Length

23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications

1 June 2004 in Physical Chemistry Chemical Physics

Journal Article

High resolution X-ray photoelectron spectroscopy of l-cysteine self-assembled films

O. Cavalleri

G. Gonella

S. Terreni

Maurizio Vignolo

L. Floreano

R. Rolandi

The increasing demand for heterogeneous materials prompts the interest for the physics and chemistry of organic–inorganic interfaces. Within this field of interest we have investigated the electronic states of L-cysteine (Cys) adsorbed on Au(111) from aqueous solution with synchrotron-based, high resolution X-ray photoemission spectroscopy. The analysis of the S 2p core level region in pristine samples prepared with purified Cys indicates that Cys adsorbs on gold as a thiolate. The absence of a signal related to physisorbed sulfur indicates that Cys forms a monomolecular layer. The high resolution allowed us to resolve two components in the C 1s spectral region related to carboxyl. The comparative analysis of C 1s, N 1s and O 1s core level regions indicates the presence of the neutral and ionic form for both the carboxyl and the amine groups. From the quantitative analysis of the C 1s and N 1s data we can infer that the zwitterionic form is the prevalent one, with a ratio of zwitterionic to neutral molecules of 3∶1. This value is quite different from that in the deposition solution. Prolonged exposure to the X-ray beam and thermal annealing induce the formation of atomic sulfur through S–C bond breaking and molecular fragment desorption. This response to X-ray irradiation differs from the results recently reported on long chain alkanethiols.

23 April 2010 in Superconductor Science and Technology

Journal Article

Transport and superconducting properties of Fe-based superconductors: a comparison between SmFeAsO_1−xF_xand Fe_1+yTe_1−xSe_x

M Tropeano

I Pallecchi

M R Cimberle

Carlo Ferdeghini

G Lamura

M Putti

15 November 2008 in Journal of Applied Physics

Journal Article

Effect of grain refinement on enhancing critical current density and upper critical field in undoped MgB2 ex situ tapes

A. Malagoli

V. Braccini

M. Tropeano

Maurizio Vignolo

C. Bernini

D. C. Larbalestier

Ex situ powder-in-tube

{MgB}_{2}

tapes prepared with ball-milled, undoped powders showed a strong enhancement of the irreversibility field

H^{*}

, the upper critical field

H_{c 2}

, and the critical current density

J_{c} (H)

together with the suppression of the anisotropy of all of these quantities.

J_{c}

reached

10^{4} A / {cm}^{2}

at 4.2 K and 10 T, with an irreversibility field of about 14 T at 4.2 K, and

H_{c 2}

of 9 T at 25 K, high values for not-doped

{MgB}_{2}

. The enhanced

J_{c}

and

H^{*}

values are associated with significant grain refinement produced by milling of the

{MgB}_{2}

powder, which enhances grain boundary pinning, even if at the same time also reducing the connectivity from about 12% to 8%. Although enhanced pinning and diminished connectivity are in opposition, the overall influence of ball milling on

J_{c}

is positive because the increased density of grains with a size comparable with the mean free path produces strong electron scattering that substantially increases

H_{c 2}

, especially

H_{c 2}

perpendicular to the Mg and B planes.

29 June 2005 in Physical Review B

Journal Article

Enhanced flux pinning in neutron irradiated

Mg B_{2}

I. Pallecchi

C. Tarantini

H. U. Aebersold

V. Braccini

C. Fanciulli

M. Putti

We study the effect of neutron irradiation on the critical current density

J_{c}

of isotopically pure polycrystalline

Mg {}^{11}B_{2}

samples. For fluences in the range

10^{17} - 10^{18} {cm}^{- 2}

J_{c}

is enhanced and its dependence on magnetic field is significantly improved: we demonstrate that, in this regime, pointlike pinning centers are effectively introduced in the system proportionally to the neutron fluence. Instead, for larger fluences, a strong suppression of the critical temperature accompanied by a decrease of both the upper critical field

B_{c 2}

and

J_{c}

is found.

18 October 2011 in Physical Review B

Journal Article

Magnetotransport in La(Fe,Ru)AsO as a probe of band structure and mobility

Ilaria Pallecchi

F. Bernardini

M. Tropeano

A. Palenzona

Alberto Martinelli

M. Putti

In this paper, we investigate the Ru-substituted LaFeAsO compound by studying the magnetotransport behavior and its relationship with the band structure in different regimes of temperature, magnetic field, and Ru content. In particular, we analyze the magnetoresistance of LaFe1$-${}xRuxAsO (0 $\le${} x $\le${} 0.6) samples with the support of ab initio calculations, and we find that in the whole series: (i) the transport is dominated by electron bands only; (ii) the magnetoresistance exhibits distinctive features related to the presence of Dirac cones; indeed, ab initio calculations confirm the presence of anisotropic Dirac cones in the band structure; (iii) the low temperature mobility is exceptionally high and reaches 18.6 m2/(Vs) in the Ru-free sample at T\,=\,2 K in the extreme limit of a single Landau level occupied in the Dirac cones; (iv) the mobility drops abruptly above 10\char21{}15 K; (v) the disorder has a very weak effect on the band mobilities and on the transport properties; and (vi) there exists a correlation between the temperature ranges of Dirac cones and SDW carrier condensation. These findings evidence the outstanding transport properties of Dirac cones in Fe-based pnictides parent compounds.

30 January 2019 in IEEE Transactions on Applied Superconductivity

Journal Article

The CERN FCC Conductor Development Program: A Worldwide Effort for the Future Generation of High-Field Magnets

+27

The study of next generation high energy accelerators based on 16 T dipoles has emphasized the need for higher performance, cost-effective $Nb_{3}Sn$ superconducting wires. A Conductor Development Program aiming to reach a non-copper critical current density ( $J_{c}$ ) of 1500 $A/mm^2$ at 16 T and 4.2 K has been launched by CERN, with the involvement of industry and laboratories worldwide. In this article, the targets and strategy of the program are presented, with an overview of the wire layouts and development activities being pursued by each partner, and the latest characterization results are reported. Three of the four participating manufacturers have successfully reached the first stage $J_{c}$ milestone, but a significant advance is still needed to achieve the final target. The next steps are briefly discussed, as the program focuses increasingly on novel alloys and methods to maximize $J_{c}$ .

About Me

Maurizio Vignolo earned his degree in chemistry from the University of Genoa in 2000 and his doctorate in materials science and technology in 2006. He is an affirmed researcher in the field of physics and chemistry, currently employed as a senior technologist at the National Research Council of Italy (CNR). From 2001 to 2020, he studied superconducting materials and their applications. In particular, he focused on nano-boron production and superconducting tape fabrication and characterization, working on nanofabrication, ball milling, X-ray diffraction, and cold mechanical deformation. Currently (2020-present), Maurizio works at the CNR’s “Giulio Natta” SCITEC Institute, where he focuses on composite polymeric materials, particularly their characterization and processability. He has published numerous articles in high-level scientific journals. Some of his most cited works involve the Large Hadron Collider and the lepton collider. He has also conducted research on high-resolution X-ray spectroscopy, preparation of self-assembled films of L-cysteine, thiols, and calixarene. His most recent publications involve microwave-assisted sintering for the preparation of composite materials.For more details, you can digit "Maurizio Vignolo" on 1) IEEE Xplore, 2) ResearchGate, and 3) Google Scholar. In recent years he has also begun to dedicate himself to popular events related to his research: https://www.youtube.com/watch?v=OGYaT83Fqh4, https://www.youtube.com/watch?v=ca0ZJBHN99o

Dr. Maurizio Vignolo

Dr. Maurizio Vignolo

Research Focus & Metrics

Academic Career Length

Publication Type Breakdown

Representative Publications

About Me

Social Links