We report a nanoxerography utilizing alternating bipolar surface charge patterns. Unlike a conventional nanoxerography using unipolar charge patterns, the present concept generates convex shaped equipotential planes with large curvature that can act as nanoscopic electrostatic lenses. Through these lenses, positively charged aerosol nanoparticles are focused into the center region of the negative surface charge pattern leading to the significant reduction of particle deposition width. We also demonstrate that the focusing capability can be controlled by changing ion flow rates. Numerical simulations of the trajectory and deposition of charged particles were done to support experimental results.
Bibliographical noteFunding Information:
This work was supported by the Global Frontier Center for Multiscale Energy Systems funded by National Research Foundation under the Ministry of Education, Science and Technology (2011-0031561). Financial support from BK21 program and WCU (World Class University) multiscale mechanical design program (R31-2008-000-10083-0) through the Korea Research Foundation is gratefully acknowledged. Authors are also affiliated with the Institute of Advanced Machinery and Design, Seoul National University, Seoul 151-742, Republic of Korea.