Characterization of nanoparticles deposition with electrospray

Nowadays the nanotechnology is pushing hard in almost every direction of the technology. Creating patterns with nanoparticles would be a very useful technique in order to manipulated nanoparticles. Here comes the motivation for this project, the possibility to get a faster an easier way to create layers and patterns using the electrospray technique. The main aim for this project is the construction of an electrospray system for nanoparticles deposition and the characterization of the nanoparticle layers deposited with this system. The necessary equipment to build the electrospray setup is explained and the gold and polystyrene nanoparticles from 100 to 630nm are described. This particles and all the experiments have been characterized with an electronic microscope (SEM-FIB) equipped with and x-ray EDS system from the CRNE. And nally a complete description of the experiments and the layers created with the di erent variations of the electrospray setups

Modeling and simulation of a cost-effective microfluidic circuit for particles' manipulation

Preprin

Colloidal crystals by electrospraying polystyrene nanofluids

Postprint (published version

TCO-free low-temperature p+ emitters for back-junction c-Si solar cells

In this work, we report on the fabrication and characterization of n-type c-Si solar cells whose p+ emitters are based on laser processed aluminum oxide/silicon carbide (Al2O3/SiCx) films. The p+ emitter is defined at the rear side of the cell and it consists of point-like laser-diffused p+ regions with a surface charge induced emitter in between based on the high negative charge located at the Al2O3/c-Si interface. These emitters are fabricated at low temperature (1000 nm) that reach the rear surface of the cell resulting in an excellent back reflector. We fabricated solar cells with distance between p+ regions or pitch ranging from 200 to 350 µm with a front surface based on silicon heterojunction technology. Best efficiency (18.1%) is obtained for a pitch of 250 µm as a consequence of the trade-off between Voc and FF values.Peer ReviewedPostprint (published version

Mechanical properties of Al2O3 inverse opals by means of nanoindentation

In order to understand the mechanical behaviour of Al2O3 inverse opals, nanoindentation techniques have been implemented in material layers with three different microstructures, in terms of hollow or polystyrene spheres, with Al2O3 shells of distinct wall thickness. Different indenter tip geometries as well as contact loading conditions have been used, in order to induce different stress field and fracture events to the layers. Field emission scanning electron microscopy and focused ion beam have been employed to understand accommodation of plastic deformation induced during the indentation process. Results show that materials with polystyrene spheres exhibit higher hardness and modulus under sharp indentation, and cracking resistance under spherical indentation. Furthermore, deformation is discerned to be mainly governed by the rotation of the microspheres. In the case of the inverse opals made of hollow spheres, the main deformation mechanisms activated under indentation are the rearrangement and densification of themPostprint (author's final draft

Characterization of nanoparticles deposition with electrospray

Nowadays the nanotechnology is pushing hard in almost every direction of the technology. Creating patterns with nanoparticles would be a very useful technique in order to manipulated nanoparticles. Here comes the motivation for this project, the possibility to get a faster an easier way to create layers and patterns using the electrospray technique. The main aim for this project is the construction of an electrospray system for nanoparticles deposition and the characterization of the nanoparticle layers deposited with this system. The necessary equipment to build the electrospray setup is explained and the gold and polystyrene nanoparticles from 100 to 630nm are described. This particles and all the experiments have been characterized with an electronic microscope (SEM-FIB) equipped with and x-ray EDS system from the CRNE. And nally a complete description of the experiments and the layers created with the di erent variations of the electrospray setups

Self-assembly of ordered polystyrene and silica nanostructures by electrospray

Postprint (published version

Phase equilibrium and lattice models in statistical mechanics

SIGLELD:D50180/84 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Self-assembly of ordered silica nanostructures by electrospray

In this paper we introduce the electrospray technique as a suitable method to create SiO2 3D ordered nanostructures. We describe the experimental procedure and deposition parameters required. We have found that the use of a high electric field is mandatory to, first, induce the Taylor cone and then, to get 3D order while the nanospheres assemble in the substrate in the drying phase. (C) 2014 Elsevier B.V. All rights reserved