Publications by Javier Reguera Gomez

Direct observation of photo-mechanical stiffness in alkanethiol-capped gold nanoparticles supracrystals by ultrafast small-angle electron diffraction

Fabrizio Carbone, Francesco Stellacci, Giulia Fulvia Mancini, Javier Reguera Gomez, Francesco Pennacchio, Tatiana Latychevskaia

We demonstrate that ultrastiff bonding between nanoparticles can be engineered by ad hoc assemblies of ligands, reaching strengths comparable to that of strong covalent bonds. Our observation relies on femtosecond small-angle electron diffraction. ...

E D P SCIENCES2019

Mineral equilibria and thermodynamic uncertainties in the geothermometrical characterisation of carbonate geothermal systems of low temperature. The case of the Alhama-Jaraba system (Spain)

Javier Reguera Gomez, Maria Pilar Asta Andres

Geothermometrical characterisation of low-temperature, carbonate-evaporitic geothermal systems is usually hampered by the lack of appropriate mineral equilibria to successfully use most of the classical geothermometers and/or by the thermodynamic uncertain ...

2019

Local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction

Fabrizio Carbone, Francesco Stellacci, Giulia Fulvia Mancini, Javier Reguera Gomez, Francesco Pennacchio, Tatiana Latychevskaia

We demonstrate that highly ordered two-dimensional crystals of ligand-capped gold nanoparticles display a local photo-mechanical stiffness as high as that of solids such as graphite. In out-of-equilibrium electron diffraction experiments, a strong temperat ...

2019

Order/Disorder Dynamics in a Dodecanethiol-Capped Gold Nanoparticles Supracrystal by Small-Angle Ultrafast Electron Diffraction

Fabrizio Carbone, Francesco Stellacci, Giulia Fulvia Mancini, Javier Reguera Gomez, Francesco Pennacchio, Tatiana Latychevskaia

The design and the characterization of functionalized gold nanoparticles supracrystals require atomically resolved information on both the metallic core and the external organic ligand shell. At present, there is no known approach to characterize simultane ...

American Chemical Society2016

Co-precipitation of oppositely charged nanoparticles: the case of mixed ligand nanoparticles

Francesco Stellacci, Maxime Tomasz Szybowski, Javier Reguera Gomez, Mauro Moglianetti, Evgeniy Ponomarev

Colloid stability is of high importance in a multitude of fields ranging from food science to biotechnology. There is strong interest in studying the stability of small particles (of a size of a few nanometres) with complex surface structures, that make th ...

Institute of Physics2015

Contact angle and adsorption energies of nanoparticles at the air-liquid interface determined by neutron reflectivity and molecular dynamics

Francesco Stellacci, Javier Reguera Gomez, Mauro Moglianetti, Evgeniy Ponomarev

Understanding how nanomaterials interact with interfaces is essential to control their self-assembly as well as their optical, electronic, and catalytic properties. We present here an experimental approach based on neutron reflectivity (NR) that allows the ...

Royal Society of Chemistry2015

Scanning tunneling microscopy and small angle neutron scattering study of mixed monolayer protected gold nanoparticles in organic solvents

Francesco Stellacci, Quy Ong Khac, Javier Reguera Gomez, Mauro Moglianetti, Marta Mameli, Kellen Michael Harkness

When a binary mixture of ligand molecules is used to coat gold nanoparticles, stripe-like domains can occur. These nanodomains confer nanoparticles unique structure-dependent properties. The domain structure has been characterized primarily using scanning ...

Royal Soc Chemistry2014

Functional carbon nanosheets prepared from hexayne amphiphile monolayers at room temperature

Guillaume Pasche, Yannik Fontana, Anne-Clémence Corminboeuf, Anna Fontcuberta i Morral, Holger Frauenrath, Emad Oveisi, Stephen Schrettl, Javier Reguera Gomez, Riccardo Petraglia

Carbon nanostructures that feature two-dimensional extended nanosheets are important components for technological applications such as high-performance composites, lithium-ion storage, photovoltaics and nanoelectronics. Chemical functionalization would ren ...

Nature Publishing Group2014

Lipid tail protrusions mediate the insertion of nanoparticles into model cell membranes

Francesco Stellacci, Kislon Voitchovsky, Maria Ricci, Javier Reguera Gomez, Paulo Henrique Jacob Silva

Recent work has demonstrated that charged gold nanoparticles (AuNPs) protected by an amphiphilic organic monolayer can spontaneously insert into the core of lipid bilayers to minimize the exposure of hydrophobic surface area to water. However, the kinetic ...

Nature Publishing Group2014

Comparative STM studies of mixed ligand monolayers on gold nanoparticles in air and in 1-phenyloctane

Francesco Stellacci, Quy Ong Khac, Javier Reguera Gomez, Shun Zhao

Scanning tunnelling microscopy (STM) studies have found stripe-like domains on gold nanoparticles (NPs) coated with certain binary mixtures of ligand molecules. The majority of these NPs' properties have been investigated for particles in solvents. Yet, mo ...

Royal Society of Chemistry2014

High-Resolution Scanning Tunneling Microscopy Characterization of Mixed Monolayer Protected Gold Nanoparticles

Christoph Renner, Francesco Stellacci, Quy Ong Khac, Javier Reguera Gomez, Mauro Moglianetti, Paulo Henrique Jacob Silva, Kellen Michael Harkness

Gold nanoparticles protected by a binary mixture of thiolate molecules have a ligand shell that can spontaneously separate into nanoscale domains. Complex morphologies arise in such ligand shells, including striped, patchy, and Janus domains. Characterizat ...

American Chemical Society2013

Quantitative Analysis of Scanning Tunneling Microscopy Images of Mixed-Ligand-Functionalized Nanoparticles

Christoph Renner, Francesco Stellacci, Quy Ong Khac, Javier Reguera Gomez

Ligand-protected gold nanoparticles exhibit large local curvatures, features rapidly varying over small scales, and chemical heterogeneity. Their imaging by scanning tunneling microscopy (STM) can, in principle, provide direct information on the architectu ...

American Chemical Society2013

Advances in Janus Nanoparticles

Francesco Stellacci, Javier Reguera Gomez

The design and synthesis of Janus nanoparticles has attracted great scientific interest in recent years. Novel optical, electronic, magnetic, and superficial properties emerge from their dimensions and unique morphology at the nanoscale. Additional propert ...

Swiss Chemical Soc2013

High-resolution scanning tunneling microscopy characterization of mixed monolayer coated gold nanoparticles

Francesco Stellacci, Quy Ong Khac, Javier Reguera Gomez, Mauro Moglianetti, Paulo Henrique Jacob Silva, Kellen Michael Harkness

Amer Chemical Soc2013

Synthesis and Characterization of Janus Gold Nanoparticles

Francesco Stellacci, Randy Patrick Carney, Quy Ong Khac, Javier Reguera Gomez

When gold nanoparticles are coated with binary mixtures of dislike ligand molecules, separation in the ligand shell occurs; if the particles are smaller than a threshold size the separation is solely enthalpy driven leading to the spontaneous formation of ...

Wiley2012