Crosslinked polymeric materials are described that contain pendant amine capture groups. Substrates can be detached, levitated, moved, dropped and reattached as desired by the use of Coulomb forces generate between Coulomb islands. 5% eucalyptus oil, and the remainder water. The attenuation is corrected for using a bi-modal function to account for the attenuation effects arising from low and high atomic mass components of the material in which the emitters are present. The second suction balancer is configured to accommodate intake air that flows reversely through the second suction chamber and the second suction chamber is configured to mix the intake air from the air intake and the intake air from the second suction balancer and dispense mixed air to an intake port of the engine.