Improving phase change thermal properties of quaternary bromides by adding SiO2 nanoparticle - Details

Author：

Xiong, Yaxuan (Xiong, Yaxuan.) | Li, Bo (Li, Bo.) | Wu, Yuting (Wu, Yuting.) (Scholars：吴玉庭) | Shi, Jianfeng (Shi, Jianfeng.) | Ma, Chongfang (Ma, Chongfang.)

Indexed by：

EI PKU CSCD

Abstract：

Melt　temperature,　fusion　heat　and　decomposition　temperature　are　three　fundamental　thermo-physical　properties　of　molten　salt.　Based　on　NaBr　(AR),　KBr　(AR),　CaBr2　(AR)　and　LiBr　(AR)　25　quaternary　bromides　with　different　average　diameter　(10　nm,　20　nm　and　50　nm)　and　mass　concentration　of　SiO2　nanoparticles　were　prepared.　Differential　scanning　calorimetry　(DSC)　was　employed　to　investigate　melt　temperature,　fusion　heat　and　decomposition　temperature　of　the　25　quaternary　bromides　with　SiO2　nanoparticles.　Experimental　results　showed　that　the　melting　point　of　the　nano-quaternary　bromides　decreased　first　and　then　increased　subsequently　with　the　increase　of　SiO2　nanoparticles.　The　fusion　heat　increased　first　and　then　decreased,　which　varies　greatly　with　the　increase　of　SiO2　nanoparticles.　As　the　mass　concentration　of　the　10　nm　SiO2　nanoparticles　is　1.5%,　nano-quaternary　bromides　reached　a　maximum　fusion　heat　of　47.06　J·g-1,　which　increased　by　89.6%.　As　the　mass　concentration　of　the　10　nm　SiO2　nanoparticles　is　0.7%,　nano-quaternary　bromides　reached　a　maximum　decomposition　temperature　of　876.3.　©　All　Right　Reserved.

Keyword：

Silica nanoparticles Sodium compounds Calcium compounds Potassium compounds SiO2 nanoparticles Lithium compounds Silicon Nanoparticles Silica Differential scanning calorimetry Bromine compounds Melting point Thermodynamic properties

Author Community：

[ 1 ] [Xiong, Yaxuan]Key Laboratory of HVAC, Beijing University of Civil Engineering and Architecture, Beijing; 100044, China
[ 2 ] [Li, Bo]Key Laboratory of HVAC, Beijing University of Civil Engineering and Architecture, Beijing; 100044, China
[ 3 ] [Wu, Yuting]Key Laboratory of Heat Transfer and Energy Conservation of Beijing Municipality, Beijing University of Technology, Beijing; 100124, China
[ 4 ] [Shi, Jianfeng]Key Laboratory of HVAC, Beijing University of Civil Engineering and Architecture, Beijing; 100044, China
[ 5 ] [Ma, Chongfang]Key Laboratory of Heat Transfer and Energy Conservation of Beijing Municipality, Beijing University of Technology, Beijing; 100124, China