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Biotechnology Congress 2018 & Emerging Materials 2018
Biomedical Research
|
ISSN: 0976-1683
|
Volume 29
S e p t e m b e r 0 6 - 0 7 , 2 0 1 8 | B a n g k o k , T h a i l a n d
allied
academies
Joint Event on
EMERGING MATERIALS AND NANOTECHNOLOGY
BIOTECHNOLOGY
&
Annual Congress on
Global Congress on
Figure.2: Schematic diagram depicting the propulsion
mechanism for the Au-Ni-Pt nanojet in H
2
O
2
solution. (a)
Illustration of Au-Ni-Pt nanojet’s propulsion originated
from momentum change, resulting from the detachment
of O
2
bubbles from H
2
O
2
decomposition catalyzed by Pt; (b)
Demonstration of the linear propulsion of the Au-Ni-Pt nanojet
steered by dual off-center nanoengines in H
2
O2 solution
Biomed Res 2018, Volume 29 | DOI: 10.4066/biomedicalresearch-C4-011
LINEAR PROPULSION OF GOLD-
NICKEL-PLATINUM NANOJET
STEERED BY DUAL OFF-CENTER
NANOENGINES
Liangxing Hu
Nanyang Technological University, Singapore
A
novel nanojet with dual off-center nano-engines consisting
of gold (Au), nickel (Ni) and platinum (Pt) is designed. Au
and Ni are shaped as a concentric disk with 12 µm in diameter.
The thicknesses of Au- and Ni-disks are 0.2 and 0.1 µm,
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 µm, respectively. A propulsion mechanism
for the Au-Ni-Pt nanojet. Without the presence of hydrogen
peroxide (H
2
O
2
), the nanojet suspended in deionized (DI) water
is stationary. After the addition of H
2
O
2
into DI water, oxygen
(O
2
) bubbles are generated at the Pt-surface (the nanojet
and O
2
bubbles have a joint velocity of v1). The generated O
2
bubbles grow bigger. At this state, the nanojet and O
2
bubbles
have a same velocity of v2. When O
2
bubbles reach a certain
diameter, they detach from the surface of the nanojet. The
nanojet has a velocity of v3, while O
2
bubbles have a different
velocity of v0. According to the momentum conservation
law and the momentum theorem, a driving force
F’drive
is
generated, resulting from momentum change induced by the
detachment of O
2
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
F’drive
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.