Table 2

Stored energy fraction F(r) for the various samples for different sunlight path lengths

SWCNH concentration (g/l)

Sample label (base fluid)

F(r)

x = 1.0 cm (%)

F(r)

x = 2.5 cm (%)

F(r)

x = 5.0 cm (%)

F(r)

x = 10.0 cm (%)


Pure base fluid

A0 (water)

20.5

26.7

31.6

36.9


Pure base fluid

G0 (glycol)

17.4

23.0

28.0

33.4


0.005

A1 (water)

54.4

82.0

95.7

99.8


0.005

G1 (glycol)

43.2

70.1

89.3

98.5


0.01

A2 (water)

72.9

95.0

99.6

100


0.01

G2 (glycol)

68.0

92.7

99.3

100


0.02

A3 (water)

90.9

99.6

100


0.02

G3 (glycol)

88.3

99.4

100


0.05

A4 (water)

99.6

100


0.05

G4 (glycol)

99.1

100


Mercatelli et al. Nanoscale Research Letters 2011 6:282   doi:10.1186/1556-276X-6-282

Open Data