ICCAS OpenIR
Fluorescence studies on local density change in supercritical CO2 mixtures using the order parameter model
Chen, Jiawei1; Shen, Dong2; Han, Buxing3
2011-02-01
Source PublicationJOURNAL OF SUPERCRITICAL FLUIDS
ISSN0896-8446
Volume56Issue:1Pages:1-5
AbstractSupercritical CO2 has many unusual physicochemical properties in or near the critical region, which is mostly due to the local density enhancements and specific molecular interactions. Compared to pure CO2, the study on CO2 mixed with co-solvent is attractive in wide applications but it is hard to quantitatively describe the local density change and intermolecular clusters in CO2 mixtures. The fluorescence response of a sensitive pyrene probe, empirical Py scale, was determined in CO2 mixed with pentane at 323.15K in different phase regions. A variable called the order parameter was introduced to account for possible correlations in the first derivative of Py scale and fluid pressure (dPy/(d(PIP0 - 1))). This model, avoiding the hard choice of the reference line in CO2 mixtures, was effective in calculating the local density change and it showed the specific molecular interaction in the critical region. The behaviors of the local density change and the isothermal compressibility of supercritical CO2 mixtures correlated well with microscopic and macroscopic observations. (C) 2010 Elsevier B.V. All rights reserved.
KeywordSupercritical Co2 Mixtures Local Density Change Py Scale Order Parameter Model Isothermal Compressibility
DOI10.1016/j.supflu.2010.11.011
Indexed BySCI
Language英语
WOS IDWOS:000287280600001
PublisherELSEVIER SCIENCE BV
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/71808
Collection中国科学院化学研究所
Corresponding AuthorChen, Jiawei
Affiliation1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.Technol & Operat Support Ctr, BJ Chem Serv, Houston, TX 77375 USA
3.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Chen, Jiawei,Shen, Dong,Han, Buxing. Fluorescence studies on local density change in supercritical CO2 mixtures using the order parameter model[J]. JOURNAL OF SUPERCRITICAL FLUIDS,2011,56(1):1-5.
APA Chen, Jiawei,Shen, Dong,&Han, Buxing.(2011).Fluorescence studies on local density change in supercritical CO2 mixtures using the order parameter model.JOURNAL OF SUPERCRITICAL FLUIDS,56(1),1-5.
MLA Chen, Jiawei,et al."Fluorescence studies on local density change in supercritical CO2 mixtures using the order parameter model".JOURNAL OF SUPERCRITICAL FLUIDS 56.1(2011):1-5.
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