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题名: Heat storage performance of disodium hydrogen phosphate dodecahydrate: Prevention of phase separation by thickening and gelling methods
作者: Lan, Xiao-Zheng;  Tan, Zhi-Cheng;  Yue, Dan-Ting;  Shi, Quan;  Yang, Chang-Guang
通讯作者: 谭志诚
关键词: phase change material ;  Na2HPO4 center dot 12H(2)O ;  thickening and gelling method ;  heat capacity
刊名: CHINESE JOURNAL OF CHEMISTRY
发表日期: 2007-07-01
卷: 25, 期:7, 页:921-925
收录类别: SCI
文章类型: Article
部门归属: 15
项目归属: 1504
产权排名: 2;2
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Disodium hydrogen phosphate dodecahydrate (Na2HPO4 center dot 12H(2)O) is an attractive candidate for phase change materials. The main problem for its practical use comes from incongruent melting character during thermal cycling. Experimentally, heat of fusion of the pure salt decreased from 200 to 25 J center dot g (-1) in a four-run freeze-thaw cycling. Additives such as thickening agent or in-situ synthesized polyacrylate sodium in the molten salt can prevent its phase separation to some extent. In the test, sodium alginate 3.0% - 5.0% (w/w) thickened mixture containing Na2HPO4 center dot 12H(2)O and some water showed constant heat storage capacities. Polyacrylate sodium gelled salt was synthesized through polymerizing sodium acrylate in the melt of Na2HPO4 center dot 12H(2)O and some extra water at 50 degrees C. Optimum conditions composed of sodium acrylate 3.0%-5.0% (w/w), cross-linking agent N,N-methylenebis-acrylamide 0.10%-0.20% (w/w), K2S2O8 and Na2SO3 (mass ratio 1 : 1) 0.06%-0.12% (w/w). As opposed to normal large, crystals of pure Na2HPO4 center dot 12H(2)O in solid state, the gelled salt existed in a large number of tiny particles dispersed in the gel network at room temperature, commonly less than 2 mm. But only those sample particles with sizes less than 0.2 mm may have relatively stable thermal storage property. A problem encountered was the poor reproducibility of the synthesis method: heat storage capacity of the product was often very different even though the synthesis was carried out in the same conditions. An alternative gelling method by sodium alginate Grafted sodium acrylate was tried and it showed a fairly good effect. Heat capacities and heat of fusion of Na2HPO4 center dot 12H(2)O were measured by an adiabatic calorimeter.
关键词[WOS]: THERMAL-ENERGY STORAGE ;  CAPACITY
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000248026100009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99727
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Shandong Agr Univ, Coll Chem & Mat Sci, Tai An 271018, Shandong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Lan, Xiao-Zheng,Tan, Zhi-Cheng,Yue, Dan-Ting,et al. Heat storage performance of disodium hydrogen phosphate dodecahydrate: Prevention of phase separation by thickening and gelling methods[J]. CHINESE JOURNAL OF CHEMISTRY,2007,25(7):921-925.
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