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题名: Thermodynamic investigation of room temperature ionic liquid - Heat capacity and thermodynamic functions of BPBF4
作者: Zhang, Z. H.;  Sun, L. X.;  Tan, Z. C.;  Xu, F.;  Lv, X. C.;  Zeng, J. L.;  Sawada, Y.
关键词: BPBF4 ;  combustion calorimetry ;  glass transition ;  heat capacity ;  room temperature ionic liquid ;  phase transition ;  standard enthalpy of formation
刊名: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
发表日期: 2007-07-01
卷: 89, 期:1, 页:289-294
收录类别: ISTP ;  SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The molar heat capacities of the room temperature ionic liquid 1-butylpyridinium tetrafluoroborate (BPBF4) were measured by an adiabatic calorimeter in temperature range from 80 to 390 K. The dependence of the molar heat capacity on temperature is given as a function of the reduced temperature X by polynomial equations, C-p,(m) [J K-1 mol(-1)]= 181.43+ 51.297X -4.7816X(2)-1.9734X(3)+ 8.1048X(4)+11.108X(5) [X=(T-135)/55] for the solid phase (80-190 K), C-p,C-m [J K-1 mol(-1)]=349.96+25.106X+9.1320X(2)+19.368X(3)+2.23X(4)-8.8201X(5) [X=( T-225)/27] for the glass state (198-252 K), and C-p,C-m [J K-1 mol(-1)]= 402.40+21.982X-3.0304X(2)+3.6514X(3)+3.4585X(4) [X=(T-338)/52] for the liquid phase (286-390 K), respectively. According to the polynomial equations and thermodynamic relationship, the values of thermodynamic function of the BPBF4 relative to 298.15 K were calculated in temperature range from 80 to 390 K with an interval of 5 K. The glass transition of BPBF4 was observed at 194.09 K, the enthalpy and entropy of the glass transition were determined to be Delta H-g=2.157 kJ mol(-1) and Delta S-g= 11.12 J K-1 mol(-1), respectively. The result showed that the melting point of the BPBF4 is 279.79 K, the enthalpy and entropy of phase transition were calculated to be Delta H-m=8.453 kJ mol(-1) and Delta S-m=30.21 J K-1 mol(-1). Using oxygen-bomb combustion calorimeter, the molar enthalpy of combustion of BPBF4 was determined to be Delta H-c(m)0 =-5451 +/- 3 kJ mol(-1). The standard molar enthalpy of formation of BPBF4 was evaluated to be Delta H-f(m)0 =-1356.3 +/- 0.8 kJ mol(-1) at T=298.150 +/- 0.001 K.
关键词[WOS]: STANDARD MOLAR ENTHALPY ;  MOLTEN-SALTS ;  1-METHYL-3-BUTYLIMIDAZOLIUM CHLORIDE ;  AROMATIC-HYDROCARBONS ;  FREE-ENERGIES ;  SOLVENTS ;  COMPLEXES ;  PLUS ;  ENTROPIES ;  ETHYL
语种: 英语
WOS记录号: WOS:000247991700042
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140717
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.Chinese Acad Sci, Dalian Inst Chem Phys, Mat & Thermochem Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China
3.Tokyo Polytech Univ, Fac Engn, Dept Nanochem, Atsugi, Kanagawa 2430297, Japan

Recommended Citation:
Zhang, Z. H.,Sun, L. X.,Tan, Z. C.,et al. Thermodynamic investigation of room temperature ionic liquid - Heat capacity and thermodynamic functions of BPBF4[J]. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,2007,89(1):289-294.
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