Experimental Investigation of Thermal Stability and Enthalpy of Eutectic Alkali Metal Solar Salt Dispersed with MgO Nanoparticles

International Journal of Technology

卷:10

SaidurRahman¹  Navid Aslfattahi²  Mohd Faizul Mohd Sabri²  A. Arifutzzaman³ 

[1] -Research Center for Nano-Materials and Energy Technology (RCNMET), School of Science and Technology, Sunway University, Bandar Sunway, Petaling Jaya, 47500, Selangor Darul Ehsan, Malaysia-Departmen;

[2] Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur;

[3] Research Center for Nano-Materials and Energy Technology (RCNMET), School of Science and Technology, Sunway University, Bandar Sunway, Petaling Jaya, 47500, Selangor Darul Ehsan, Malaysia;

关键词: enthalpy;    mgo;    solar salt;    thermal stability;   

DOI  :  10.14716/ijtech.v10i6.3568

来源: DOAJ

【 摘 要 】

In this study,nanocomposites containing a pre-defined mass ratio of solar salt (NaNO3-KNO3:60-40 wt.%) dispersedwith magnesium oxide (MgO) nanoparticles with nominal sizes of 100 nm wereprepared in solid and liquid states. The proposed amounts of sodium nitrate andpotassium nitrate were added to certain amounts of ultrapure deionized (DI)water comprising a 5 wt.% concentration of MgO nanoparticles. Afterward, theprepared mixture was placed in a dry oven to mix in a liquid state to obtainwell-dispersed nanocomposites. Scanning electronic microscopy (SEM) wasconducted to evaluate the uniformity of synthesized, molten salt–basedmagnesium oxide–nanoparticles, revealing a uniform dispersion. Enthalpy andmelting point measurements were performed using differential scanningcalorimetry. The experimental results of solar salt–based MgO indicateddecreases in melting point and enthalpy by 7% and 12.4%, respectively. Thereduction of enthalpy indicated that, with the addition of magnesium oxide tosolar salt, the final nanocomposite tends to have more exothermic reactions andenhanced thermal conductivity performance at the melting point. Lower meltingpoints constitute one of the major concerns regarding molten salt–basednanofluids. MgO nanoparticles with a concentration of 5 wt.% have a meltingpoint decreased by 7%. Mass loss and thermal stability measurements wereconducted using thermogravimetric analysis (TGA). The experimentally acquiredresults revealed an increment of decomposition temperature from 734.29°C to750.73°C, demonstrating the enhancement of thermal stability at hightemperatures.

【 授权许可】

Unknown