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Kapcsolat
Effects of Particle Size on the Attenuated Total Reflection Spectrum of Minerals 
Tartalom:  http://real.mtak.hu/41199/ 

Archívum:  MTA Könyvtár 
Gyűjtemény: 
Status = In Press
Type = Article 
Cím: 
Effects of Particle Size on the Attenuated Total Reflection Spectrum of Minerals

Létrehozó: 
Udvardi, Beatrix
KovĂˇcs, IstvĂˇn JĂˇnos
Fancsik, TamĂˇs
KĂłnya, PĂ©ter
BĂˇtori, MiklĂłsnĂ©
Stercel, Ferenc
Falus, GyĂ¶rgy
Szalai, ZoltĂˇn

Kiadó: 
Society for Applied Spectroscopy

Dátum: 
20160725

Téma: 
QC02 Optics / fĂ©nytan
QD01 Analytical chemistry / analitikai kĂ©mia
QD05 Crystallography / kristĂˇlytan
QD06 Mineralogy / ĂˇsvĂˇnytan

Tartalmi leírás: 
This study focuses on particle size effect on monomineralic powders recorded using attenuated total reflection Fourier
transform infrared (ATR FTIR) spectroscopy. Six particle size fractions of quartz, feldspar, calcite, and dolomite were prepared (<2, 2â€“4, 4â€“8, 8â€“16, 16â€“32, and 32â€“63 mm). It is found that the width, intensity, and area of bands in the ATR FTIR spectra of minerals have explicit dependence on the particle size. As particle size increases, the intensity and area of IR bands usually decrease while the width of bands increases. The band positions usually shifted to higher wavenumbers with decreasing particle size. Infrared spectra of minerals are the most intensive in the particle size fraction of 2â€“4 mm. However, if the particle size is very small (<2 mm), due to the wavelength and penetration depth of the IR light, intensity decreases. Therefore, the quantity of very finegrained minerals may be underestimated compared to the coarser phases. A nonlinear regression analysis of the data indicated that the average coefficients and indices of the power trend line equation imply a very simplistic relationship between median particle diameter and absorbance at a given wavenumber. It is concluded that when powder samples with substantially different particle size are compared, as in regression analysis for modal predictions using ATR FTIR, it is also important to report the grain size distribution or surface area of samples. The band area of water (3000â€“3620 cmâ€“1) is similar in each mineral fraction, except for the particles below 2 mm. It indicates that the finest particles could have disproportionately more water adsorbed on their larger surface area. Thus, these higher wavenumbers of the ATR FTIR spectra may be more sensitive to this spectral interference if the number of particles below 2 mm is considerable. It is also concluded that at least a proportion of the moisture could be very adhesive to the particles due to the band shift towards lower wavenumbers in the IR range of 3000â€“3620 cmâ€“1. 
Nyelv: 
magyar

Típus: 
Article
PeerReviewed
info:eurepo/semantics/article

Formátum: 
text

Azonosító: 
Udvardi, Beatrix and KovĂˇcs, IstvĂˇn JĂˇnos and Fancsik, TamĂˇs and KĂłnya, PĂ©ter and BĂˇtori, MiklĂłsnĂ© and Stercel, Ferenc and Falus, GyĂ¶rgy and Szalai, ZoltĂˇn (2016) Effects of Particle Size on the Attenuated Total Reflection Spectrum of Minerals. APPLIED SPECTROSCOPY. ISSN 00037028 (In Press)

Kapcsolat: 
DOI: 10.1177/0003702816670914
