In this work the effect of the dielectrophoretic force (DEP) in the self-assembly process of nanoparticles electrosprayed onto a substrate, is examined. DEP force is originated by the electric field created by the electrospray gun and by the distortion of the field created by the effective dipole of each nanoparticle. It is also shown that the modulus of this force is large when the distance between particles is few times its diameter, provided the medium is wet and the electric field is not switched off.
The directional nature of DEP In this wet phase, is shown to chain nanoparticles aligned with the main electric field direction. Although there is a repulsive force between chains in the orthogonal direction to the field, it is minimum when the beads align with the voids in the nearby chains.
DEP is a dominant force in the close distances of nanoparticles compared to double layer, van der Waals, electrophoretic retardation, weight and buoyancy.
Aragoneses, A.; Tamayo, I.; Lebrato, A.; Cañadas, J.C.; Diego, J.; Arencon, D.; Belana, J. Journal of electrostatics Vol. 71, num. 4, p. 611-617 DOI: 10.1016/j.elstat.2013.03.003 Data de publicació: 2013-04-02 Article en revista
Charge distribution and transport have been investigated in LDPE films with different humidity content under electric fields up to 130 MV/m. Pulsed electroacoustic measurements showed that, as water content increases, positive charge packets formation in the anode is enhanced and they propagate toward the cathode with higher transit speeds. Fits of surface potential decay measurements showed that charges in dry samples are injected directly into the volume, but the presence of moisture generates new trap centers in the surface of the material. This new trap level causes a charge accumulation on the surface, that gradually passes into the bulk. The observed behavior in development and propagation of charge packets are explained according to these results. Thermally stimulated depolarization current measurements showed a non-distributed relaxation associated to the new trap levels on the surface of the wet samples.
Montaña, J.; Soula, S.; Murphy, M.; March, V.; Aranguren, D.; Sola, G.; Romero, D. Journal of electrostatics Vol. 67, num. 2-3, p. 513-517 DOI: 10.1016/j.elstat.2009.01.030 Data de publicació: 2009-05 Article en revista
Aranguren, D.; Montaña, J.; Sola, G.; March, V.; Romero, D.; Torres, H. Journal of electrostatics Vol. 67, num. 2-3, p. 507-512 DOI: 10.1016/j.elstat.2009.01.023 Data de publicació: 2009-05 Article en revista
March, V.; Arrayas, M.; Trueba, J.; Montaña, J.; Romero, D.; Sola, G.; Aranguren, D. Journal of electrostatics Vol. 67, num. 2-3, p. 301-306 DOI: 10.1016/j.elstat.2009.01.039 Data de publicació: 2009-05 Article en revista
Montaña, J.; Rodriguez, P.; Bergas, J.; Illa, A.; Hermoso, B.; Candela, J. Journal of electrostatics Vol. 65, num. 7, p. 431-437 DOI: 10.1016/j.elstat.2006.10.005 Data de publicació: 2007-06 Article en revista