Environmental Engineering Reference
In-Depth Information
Fig. 10 DSC heating and
cooling curves for as-
prepared a field's metal and
b indium nanoparticles
dispersed in PAO oil. For
comparison, the experimental
data for the corresponding
bulk metals are also plotted.
The melting-freezing phase
transition points correspond
to the endothermal and
exothermal peaks. Subscripts
are as follows: b = bulk
metal; n = nanoparticles;
m = melting; f = freezing
[
5
]
(a)
20
Bulk Field's metal
Field's metal nanoparticles
T
bf
= 53.9
o
C
10
T
nf
= 17.8
o
C
0
T
nm
= 62.8
o
C
-10
T
bm
= 63.2
o
C
-20
-20
0
20
40
60
80
Temperature (
o
C)
(b)
20
Bulk Indium
Indium nanoparticles
T
bf
= 1
5
3.8
o
C
T
nf
=
10
7.1
o
C
10
0
-10
T
nm
= 157.1
o
C
T
bm
= 158.3
o
C
-20
60
80
100
120
140
160
180
Temperature (
o
C)
4.2 NPG Nanoparticles (Solid-Solid PCM)
NPG is a solid-solid PCM, which can eliminate potential issues with having a liquid
dispersed phase. The section will discuss the synthesis of NPG nanoparticles.
4.2.1 Synthesis of NPG Nanoparticles
An aerosol system has been employed to synthesize NPG PCM nanoparticles. The
schematic setup is shown in Fig.
11
. In this system, PCM droplets are generated
by the Atomizer, dried in the Diffusion Dryers, and then directly bubbled to the
base fluids to form PCM nanofluids. The PCM nanoparticle size can be real-time
monitored by passing them to the Differential Mobility Analyzer (DMA) and a
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