Claims:1. A composition comprising:
a) at least one base fluid; and
b) at least one carbon nanomaterial,
wherein the at least one carbon nanomaterial has a weight percentage in the range of 0.5 – 1.5 % with respect to the composition.
2. The composition as claimed in claim 1, wherein the at least one carbon nanomaterial has a weight percentage in the range of 0.8 – 1.2 % with respect to the composition.
3. The composition as claimed in claim 1, wherein the at least one base fluid has a viscosity index in the range of 90 – 120.
4. The composition as claimed in claim 1, wherein the at least one base fluid has a specific heat capacity in the range of 2.000 – 2.100 kJ/kg K, at 50 °C.
5. The composition as claimed in claim 1, wherein the at least one base fluid has a no-flow point in the range of -2 to -25 °C.
6. The composition as claimed in claim 1, wherein the at least one base fluid has a flash point in the range of 195 – 210 °C.
7. The composition as claimed in claim 1, wherein the at least one base fluid comprises: (a) saturates having weight percentage in the range 70 – 95%; (b) aromatics having weight percentage in the range of 0-25%; (c) resins having weight percentage in the range of 0-3%; and (d) asphalts having weight percentage in the range of 0.5 – 2%.
8. The composition as claimed in claim 1, wherein the at least one base fluid is selected from the group consisting of Hytherm 500, Hytherm 600, and combinations thereof.
9. The composition as claimed in claim 8, wherein Hytherm 500 comprises: (a) saturates having weight percentage in the range 70 – 75%; (b) aromatics having weight percentage in the range of 20-25%; (c) resins having weight percentage in the range of 1-3%; and (d) asphalts having weight percentage in the range of 1 – 2%.
10. The composition as claimed in claim 8, wherein Hytherm 600 comprises: (a) saturates having weight percentage in the range 90 – 95%; (b) aromatics having weight percentage in the range of 0-5%; (c) resins having weight percentage in the range of 0-1%; and (d) asphalts having weight percentage in the range of 0.1 – 1%.
11. The composition as claimed in claim 1, wherein the at least one carbon nanomaterial is selected from the group consisting of carbon nanotubes, carbon nanohorns, carbon-based quantum dots, fullerenes, graphenes, and combinations thereof.
12. The composition as claimed in claim 11, wherein the carbon nanotube is selected from the group consisting of single walled carbon nanotubes (SWCNTs), multi-walled carbon nanotubes (MWCNTs), and combinations thereof.
13. The composition as claimed in claim 1, wherein the at least one carbon nanomaterial is functionalized multi-walled carbon nanotubes (f-MWCNTs).
14. The composition as claimed in claim 1, wherein the at least one carbon nanomaterial is carboxy-functionalized multi-walled carbon nanotubes.
15. The composition as claimed in claim 14, wherein the carboxy-functionalized multi-walled carbon nanotubes has outer diameter in the range of 7 – 30 nm and length in the range of 5 – 500 µm.
16. The composition as claimed in any of the claims 1 – 15, wherein the composition exhibits an enhanced thermal conductivity with an enhancement of up to 93%, compared to the thermal conductivity of base fluid alone.
17. The composition as claimed in any of the claims 1 – 16, wherein the composition exhibits substantially the same thermal conductivity after 10 cycles of loop operations, as it shows during the first cycle.
18. A process for the preparation of composition as claimed in claim 1, comprising the steps of: (a) contacting at least one base fluid with at least one carbon nanomaterial to obtain a first mixture; (b) homogenizing the first mixture by sonication to obtain the composition.
19. The process as claimed in claim 18, wherein: (a) contacting at least one base fluid with at least carbon nanomaterial to obtain the first mixture is carried out at a temperature in the range of 25 - 50 °C in a portion-wise manner, over a period in the range 1.5 – 2.5 hours; (b) homogenizing the first mixture by sonication to obtain the composition is carried out at a temperature in the range of 30 – 60 °C for a period in the range of 1 – 4 hours.
20. The composition as claimed in any of the claims 1 – 17, wherein the composition can be used as a heat transfer fluid for heat storage and heat transfer applications.
, Description:AS ATTACHED