Document Detail


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.
MedLine Citation:
PMID:  23342358     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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 °C (KV@40). A collection of Raman spectra from samples cooled around -160 °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.
Authors:
Mooeung Kim; Hoeil Chung
Related Documents :
24177658 - The mechanism of action of dnp on phospholipid bilayer membranes.
19049178 - Sol-gel synthesis and behaviour of nickel containing zno nanoparticles.
16196818 - Exotic kondo effect from magnetic trimers.
24359748 - Local partition coefficients govern solute permeability of cholesterol-containing membr...
6232268 - Voltage-driven atp synthesis by beef heart mitochondrial f0f1-atpase.
18255088 - Cu2+ ions as a paramagnetic probe to study the surface chemical modification process of...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-23
Journal Detail:
Title:  The Analyst     Volume:  -     ISSN:  1364-5528     ISO Abbreviation:  Analyst     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372652     Medline TA:  Analyst     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Chemistry and Research Institute for Natural Sciences, Hanyang University, Seoul, Korea 133-791. hoeil@hanyang.ac.kr.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Analysis of soft tissue display during enjoyment smiling: part 1-Caucasians.
Next Document:  Respiratory syncytial virus persistence in macrophages alters the profile of cellular gene expressio...