Optical characterization of films of asphaltenes using diffuse reflection spectroscopy

2011 ◽  
Author(s):  
Aaron Munoz Morales ◽  
Freddy Narea ◽  
Henry Labrador ◽  
Jose Ostos
Keyword(s):  
Diffuse Reflection ◽  
Optical Characterization ◽  
Diffuse Reflection Spectroscopy ◽  
Reflection Spectroscopy

Optical characterization of volcanic ash using diffuse reflection spectroscopy

2013 ◽  
Author(s):  
D. Kelly Bravo ◽  
Nelsón Falcón ◽  
Freddy J. Narea ◽  
Rafael A. Muñoz ◽  
Aaron A. Muñoz
Keyword(s):  
Volcanic Ash ◽  
Diffuse Reflection ◽  
Optical Characterization ◽  
Diffuse Reflection Spectroscopy ◽  
Reflection Spectroscopy

scholarly journals Determining the Location of Co2+ in Zeolites by UV-Vis Diffuse Reflection Spectroscopy: A Critical View

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 123 ◽  
Author(s):  
Andrea Bellmann ◽  
Christine Rautenberg ◽  
Ursula Bentrup ◽  
Angelika Brückner
Keyword(s):  
Diffuse Reflection ◽  
Co Adsorption ◽  
In Situ Ftir ◽  
Diffuse Reflection Spectroscopy ◽  
Reflection Spectroscopy ◽  
Oxide Supports ◽  
In Situ Ftir Spectroscopy ◽  
Vis Spectroscopy

UV–Vis spectroscopy as well as in situ FTIR spectroscopy of pyridine and CO adsorption were applied to determine the nature of Co species in microporous, mesoporous, and mixed oxide materials like Co–ZSM-5, Co/Na–ZSM-5, Co/Al–SBA-15, and Co/Al2O3–SiO2. Because all sample types show comparable UV–Vis spectra with a characteristic band triplet, the former described UV–Vis band deconvolution method for determination and quantification of individual cationic sites in the zeolite appears doubtful. This is also confirmed by results of pyridine and CO adsorption revealing that all Co–zeolite samples contain two types of Co2+ species located at exchange positions as well as in oxide-like clusters independent of the Co content, while in Co/Al–SBA-15 and Co/Al2O3–SiO2 only Co2+ species in oxide-like clusters occur. Consequently, the measured UV–Vis spectra represent not exclusively isolated Co2+ species, and the characteristic triplet band is not only related to γ-, β-, and α-type Co2+ sites in the zeolite but also to those dispersed on the surface of different oxide supports. The study demonstrates that for proper characterization of the formed Co species, the use of complementary methods is required.

Detection Limits for Blood on Four Fabric Types Using Infrared Diffuse Reflection Spectroscopy in Mid- and Near-Infrared Spectral Windows

2015 ◽  
Vol 87 (17) ◽  
pp. 8740-8747 ◽  
Author(s):  
Stephanie A. DeJong ◽  
Zhenyu Lu ◽  
Brianna M. Cassidy ◽  
Wayne L. O’Brien ◽  
Stephen L. Morgan ◽  
...  
Keyword(s):  
Near Infrared ◽  
Diffuse Reflection ◽  
Detection Limits ◽  
Diffuse Reflection Spectroscopy ◽  
Reflection Spectroscopy ◽  
Infrared Spectral

scholarly journals Detection and identification of explosive RDX by THz diffuse reflection spectroscopy

2006 ◽  
Vol 14 (1) ◽  
pp. 415 ◽  
Author(s):  
Hai-Bo Liu ◽  
Yunqing Chen ◽  
Glenn J. Bastiaans ◽  
X.-C. Zhang
Keyword(s):  
Diffuse Reflection ◽  
Diffuse Reflection Spectroscopy ◽  
Reflection Spectroscopy ◽  
Detection And Identification
Sign in / Sign up

Export Citation Format

Share Document