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Enhancement of the spectral selectivity of complex samples by measuring them in a frozen state at low temperatures in order to improve accuracy for quantitative analysis. Part II. Determination of viscosity for lube base oils using Raman spectroscopy

Title
Enhancement of the spectral selectivity of complex samples by measuring them in a frozen state at low temperatures in order to improve accuracy for quantitative analysis. Part II. Determination of viscosity for lube base oils using Raman spectroscopy
Author
정회일
Keywords
2-DIMENSIONAL CORRELATION SPECTROSCOPY; PHOTOACOUSTIC INFRARED-SPECTROSCOPY; DISTILLATION FRACTIONS; FT-RAMAN
Issue Date
2013-02
Publisher
Royal Society of Chemistry
Citation
The Analyst : An International Journal of Analytical and Bioanalytical Science, v.138 no.5, 2013년, pp.1515 - 1522
Abstract
The use of selectivity-enhanced Raman spectra of lube base oil (LBO) samples achieved by the spectral collection under frozen conditions at low temperatures was effective for improving accuracy for the determination of the kinematic viscosity at 40 degrees C (KV@40). A collection of Raman spectra from samples cooled around -160 degrees C provided the most accurate measurement of KV@40. Components of the LBO samples were mainly long-chain hydrocarbons with molecular structures that were deformable when these were frozen, and the different structural deformabilities of the components enhanced spectral selectivity among the samples. To study the structural variation of components according to the change of sample temperature from cryogenic to ambient condition, n-heptadecane and pristane (2,6,10,14-tetramethylpentadecane) were selected as representative components of LBO samples, and their temperature-induced spectral features as well as the corresponding spectral loadings were investigated. A two-dimensional (2D) correlation analysis was also employed to explain the origin for the improved accuracy. The asynchronous 2D correlation pattern was simplest at the optimal temperature, indicating the occurrence of distinct and selective spectral variations, which enabled the variation of KV@40 of LBO samples to be more accurately assessed.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2013/AN/c2an00023g#!divAbstracthttp://hdl.handle.net/20.500.11754/51810
ISSN
0003-2654; 1364-5528
DOI
10.1039/c2an00023g
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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