Table 2 Average particle size distribution and zeta potential of nanofluids.

From: Optimizing the heat transfer characteristics of MWCNTs and TiO2 water-based nanofluids through a novel designed pilot-scale setup

Time (day)

MWCNTs

TiO2

Label in Fig. 6

Average particle size distributions (nm)

Zeta potential (mV)

Label in Fig. 6

Average particle size distributions (nm)

Zeta potential (mV)

1

a

219

45.1

f

270.1

41.9

2

b

223.9

41.6

g

281.9

41.6

3

c

209

43.2

h

306

39.5

7

d

222.4

42.7

i

340.5

23.1

After the test

e

211.9

44.4

j

254

40.8

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