Numerical simulation of microscopic motion and deposition of nanoparticles via electrodynamic focusing

Multifurcation Assembly of Charged Aerosols and Its Application to 3D Structured Gas Sensors

“…Filling up the mold with approaching nanoparticles should exactly reproduce the shapes of the assemblies in Figure 2a (see also the schematic in Figure S3, Supporting Information). For simulations of the structure growth with approaching charged aerosol nanoparticles, we solved the following Langevin equation considering the Brownian random force, the fluid drag force, the Coulomb force, the image force, and the van der Waals force by using our homemade program (details in our previous work [22,29] ):…”

Assembly of Nanoparticles: Towards Multiscale Three-Dimensional Architecturing

“…Numerical simulations for the IAAL system can be done by solving this Langevin equation and the detailed simulation method and its results can be found in other studies 89,90) .…”

“…Fig. 5 shows the comparison of the configurations of particle depositions investigated with both experimental and computational methods according to different surface charge densities 90) . The particle depositions were carried out within 230 230-nm 2 square photoresist patterns (thickness ~135-nm) using IAAL.…”

“…The shape of photoresist patterns also influence on the shape of the electric field around the photoresist patterns, which consequently affect the focusing effect of IAAL. You and Choi 90) computationally demonstrated the effect of the aspect ratio of a photoresist pattern on the trajectories of charged particles during the IAAL deposition process. In the simulation, photoresist patterns with different thickness of 105-nm, 135-nm and 165-nm but the same width of 230-nm were tested.…”

“…For example, depositions of polystyrene nanoparticles having passed a neutralizer, polonium-210, did not involve noise particles on the surface of the photoresist. The effect of nanoparticle charges on the extent of focusing in IAAL was also analyzed using numerical simulations by You and Choi 90) . The numerical results indicated that the larger charges the par ticle had, the larger velocity the par ticle gained, and, consequently, the greater inertial effect it experienced and the more it deviated from the converging electric field leading to the broadening.…”