Evaluating Stability of Aqueous Multiwalled Carbon Nanotube Nanofluids by Using Different Stabilizers
Table 4
Results for the stability of MWNFs.
Stabilizer
Parameters
Stabilizer concentration (wt.%)
0.05
0.1
0.2
0.4
0.8
CH
(%)*
−80.27
−60.71
−42.85
−33.44
−31.56
(%)**
−88.60
−73.91
−56.29
−56.92
−55.57
(mV)
38.0
45.1
46.2
44.0
40.0
DRT
4.26
0.88
3.44
1.96
8.10
(mPas)
3.29
1.99
1.57
1.60
2.26
(%)
236.96
103.32
60.74
63.43
130.75
RSD (%)
3.12
2.78
3.45
1.97
2.89
SDS
(%)*
−78.34
−59.09
−11.04
−5.40
−10.99
(%)**
−89.46
−83.59
−53.31
−58.17
−54.44
(mV)
−63.0
−61.7
−65.0
−76.3
−85.6
DRT
0.76
4.55
0.18
3.34
1.78
(mPa·s)
1.45
1.74
1.10
1.51
2.04
(%)
48.72
78.45
12.47
54.48
108.95
RSD (%)
1.03
6.70
0.23
0.54
0.77
SDBS
(%)*
−73.60
−25.98
−23.41
0
−10.98
(%)**
−84.32
−63.15
−56.62
−57.71
−54.44
(mV)
−54.9
−69.5
−80.0
−78.9
−71.0
DRT
0.65
16.15
5.05
0.42
1.55
(mPas)
2.02
2.30
2.26
1.07
4.49
(%)
106.39
135.23
130.75
9.78
359.14
RSD (%)
0.64
2.09
0.78
0.56
3.55
Water
DRT
0.07
(mPas)
0.98
RSD (%)
0.46
ABS (%)* is absorbance ratio of static position method after 30 days.
ABS (%)** is absorbance ratio after centrifugation at 5000 rpm and 30 minutes. Viscosity () is mean viscosity at shear rate of 225 s−1 in 160 seconds.
