天美传媒

Abstract

In this paper, a novel nanojet with dual off-center nanoengines consisting of Au, Ni and Pt is designed, as shown in Figure 1. Au and Ni are shaped as concentric disks with 12 渭m in diameter. The thicknesses of Au- and Ni-disks are 0.2 and 0.1 渭m, respectively. Two identically off-center Pt nozzle nanoengines form cylindrical chambers and are symmetrically distributed on the base of the Au-Ni disk. The diameter, bottom-thickness, wall-height and wall-thickness of the nozzle nanoengines are 3, 0.3, 1.5 and 0.3 渭m, respectively. The propulsion mechanism for the Au-Ni-Pt nanojet. Without the presence of hydrogen peroxide (H2O2), the nanojet suspended in deionized (DI) water is stationary. After the addition of H2O2 into DI water, oxygen (O2) bubbles are generated at the Pt-surface (the nanojet and O2 bubbles have a joint velocity of v1). The generated O2 bubbles grow bigger (growing state in Figure 2(a)). At this state, the nanojet and O2 bubbles have a same velocity of v2. When O2 bubbles reach a certain diameter, they detach from the surface of the nanojet (detaching state in Figure 2(a)). The nanojet has a velocity of v3, while O2 bubbles have a different velocity of v0. According to the Momentum Conservation Law and the Momentum Theorem, a driving force F鈥檇rive is generated, resulting from momentum change induced by the detachment of O2 bubbles, to thrust the nanojet propelling forward. The nanojet is equipped with two identically and symmetrically distributed off-center nanoengines, resulting in the total driving force Fdrive is well aligned with the drag force Fdrag. Hence, the Au-Ni-Pt nanojet propels forward linearly. At steady state, the nanojet will continuously propel forward at a speed of v.

Biography

E-mail: LHU001@e.ntu.edu.sg