Characterization of Athabasca tar sand malthenes by diffuse reflectance infrared spectrometry

1988 ◽  
Vol 2 (1) ◽  
pp. 26-31 ◽  
Author(s):  
P. W. Yang ◽  
H. H. Mantsch ◽  
L. S. Kotlyar ◽  
J. R. Woods
Keyword(s):  
Diffuse Reflectance ◽  
Infrared Spectrometry ◽  
Diffuse Reflectance Infrared

Diffuse Reflectance Infrared Spectroscopic Characterization of Silica Dehydroxylation

1990 ◽  
Vol 44 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Robert L. White ◽  
Aurobindo Nair
Keyword(s):  
Force Constant ◽  
Diffuse Reflectance ◽  
Spectroscopic Characterization ◽  
Absorption Bands ◽  
Stretching Vibration ◽  
Diffuse Reflectance Infrared ◽  
Highly Strained ◽  
Infrared Absorption Bands ◽  
Absorbance Band

Diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) is employed to study the dehydroxylation of amorphous silica. Dehydroxylation results in the appearance of infrared absorption bands at 1022, 1107, and 1240 cm−1 assigned to asymmetric stretching vibrations for three different siloxane bridge types. The 1107-cm−1 absorbance band represents a siloxane bridge that is indistinguishable from bulk species. The 1022-cm−1 absorbance band represents a siloxane bridge with a bond angle that is smaller than the bulk, with little change in the stretching vibration force constant. The 1240-cm−1 absorbance band derives from a siloxane bridge characterized by a stretching force constant significantly larger than that of bulk siloxane bridges. This band may be indicative of a highly strained or broken siloxane bridge.

Diffuse reflectance infrared spectrometry of powdered coals

Fuel ◽  
1982 ◽  
Vol 61 (6) ◽  
pp. 529-536 ◽  
Author(s):  
Michael P. Fuller ◽  
Issam M. Hamadeh ◽  
Peter R. Griffiths ◽  
Douglas E. Lowenhaupt
Keyword(s):  
Diffuse Reflectance ◽  
Infrared Spectrometry ◽  
Diffuse Reflectance Infrared

Preparation of Calibration Standards for Quantitative Diffuse Reflectance Infrared Spectrometry

1984 ◽  
Vol 38 (4) ◽  
pp. 486-491 ◽  
Author(s):  
Issam M. Hamadeh ◽  
S. Agyare Yeboah ◽  
Kathy A. Trumbull ◽  
Peter R. Griffiths
Keyword(s):  
Diffuse Reflectance ◽  
Infrared Spectrometry ◽  
Calibration Standards ◽  
Diffuse Reflectance Infrared
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