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题名: Crystal structures and thermodynamic properties on phase change materials n-CnH2n+1NH3 center dot H2PO4(s) (n=8, 9 and 10)
作者: Zhang, Li-Jun1;  Di, You-Ying1;  Tan, Zhi-Cheng2, 3;  Dou, Jian-Min1
关键词: n-CnH2n+1NH3 center dot H2PO4(s) (n=8, 9 and 10) ;  Crystal structure ;  Adiabatic calorimetry ;  Low-temperature heat capacity ;  Solid-solid phase transition ;  Thermodynamic functions
刊名: SOLAR ENERGY MATERIALS AND SOLAR CELLS
发表日期: 2012-06-01
DOI: 10.1016/j.solmat.2012.02.029
卷: 101, 页:79-86
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Energy & Fuels ;  Materials Science, Multidisciplinary ;  Physics, Applied
研究领域[WOS]: Energy & Fuels ;  Materials Science ;  Physics
英文摘要: Crystal structures of three long-chain n-alkylammonium dihydrogen phosphates n-CnH2n+1NH3 center dot H2PO4(s) (n=8, 9 and 10) (abbreviated as C8P, C9P and C10P), which may be used as the phase change materials in storage and utilization of solar energy, were determined in layered structures by X-ray crystallography, and the same hydrogen bonding network is observed for these long carbon chain compounds. Low-temperature heat capacities of the compounds were measured by a precision adiabatic calorimeter over the temperature range from 78 to 380 K. Two solid-solid phase transitions were observed for C8P and C9P, but only one solid-solid phase transition was observed for C10P. The temperatures, molar enthalpies and entropies of the phase transitions were determined based on the analysis of heat capacity curves. Experimental heat capacities for each compound were fitted to two polynomial equations. The smoothed heat capacities and thermodynamic functions (H-T(o)-H-298.15(o)) and (S-T(o)-E-298.15(o)) of the three compounds were calculated with an interval of 10 K in terms of the polynomial equations. (C) 2012 Elsevier B.V. All rights reserved.
关键词[WOS]: HEAT-CAPACITY ;  IONIC LIQUIDS ;  LATTICE ;  TRANSITION ;  ENTHALPY
语种: 英语
WOS记录号: WOS:000303957000015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142992
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.Liaocheng Univ, Coll Chem & Chem Engn, Shandong Prov Key Lab Chem Energy Storage & Novel, Liaocheng 252059, Shandong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Dalian 116023, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Zhang, Li-Jun,Di, You-Ying,Tan, Zhi-Cheng,et al. Crystal structures and thermodynamic properties on phase change materials n-CnH2n+1NH3 center dot H2PO4(s) (n=8, 9 and 10)[J]. SOLAR ENERGY MATERIALS AND SOLAR CELLS,2012,101:79-86.
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