Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 2, Issue 6, Pages 1685-1691Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am100204b
Keywords
encapsulation; phase-change nanoparticles; heat transfer; colloid suspension
Funding
- Air Force Research Laboratory (AFRL)
- National Science Foundations [CBET 0828466]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0828466] Funding Source: National Science Foundation
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This paper describes a new method to enhance the heat-transfer property of a single-phase liquid by adding encapsulated phase-change nanoparticles (nano-PCMs), which absorb thermal energy during solid liquid phase changes. Silica-encapsulated indium nanoparticles and polymer-encapsulated paraffin (wax) nanoparticles have been made using colloid method, and suspended into poly-alpha-olefin (PAO) and water for potential high- and low-temperature applications, respectively. The shells prevent leakage and agglomeration of molten phase-change materials, and enhance the dielectric properties of indium nanoparticles. The heat-transfer coefficients of PAO containing indium nanoparticles (30% by mass) and water containing paraffin nanoparticles (10% by mass) are 1.6 and 1.75 times higher than those of corresponding single-phase fluids. The structural integrity of encapsulation allows repeated use of such nanoparticles for many cycles in high heat generating devices.
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