Effect of dielectrophoretic force in the self-assembly process of electrosprayed nanoparticles |
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| Affiliation: | 1. Univ. Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France;2. CEA, INAC-SPSMS, F-38000 Grenoble, France;3. Department of Physics, College of William and Mary, Williamsburg, Virginia 23187, USA;4. Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, NL-2628 CJ, Delft, The Netherlands;1. ISIS, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK;2. Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK;1. School of Physics and Engineering, Sun Yet-sen University, Guangzhou 510275, Guangdong, China;2. Guangzhou Institute of Measurement and Testing Technology, Guangzhou 510663, Guangdong, China;1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi׳an 710021, China;2. Shaanxi Research Institute of Agricultural Products Processing Technology, Xi׳an 710021, China |
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| Abstract: | 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. |
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| Keywords: | Nanoparticles Electrospray Self-assembly |
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