On the Structure of Vanadium Oxide Supported on Aluminas:  UV and Visible Raman Spectroscopy, UV−Visible Diffuse Reflectance Spectroscopy, and Temperature-Programmed Reduction Studies

2005 ◽  
Vol 109 (7) ◽  
pp. 2793-2800 ◽  
Author(s):  
Zili Wu ◽  
Hack-Sung Kim ◽  
Peter C. Stair ◽  
Sreekala Rugmini ◽  
S. David Jackson
Keyword(s):  
Raman Spectroscopy ◽  
Vanadium Oxide ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Temperature Programmed Reduction ◽  
Uv Visible ◽  
Temperature Programmed

UV–visible diffuse reflectance spectroscopy used in analysis of lignocellulosic biomass material

2020 ◽  
Vol 54 (4) ◽  
pp. 837-846
Author(s):  
Hui Zhang ◽  
Xinping Wang ◽  
Jun Wang ◽  
Qiuyan Chen ◽  
Hai Huang ◽  
...  
Keyword(s):  
Lignocellulosic Biomass ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Uv Visible

scholarly journals Non-oxidative dehydrogenation of isobutane over supported vanadium oxide: nature of the active sites and coke formation

2020 ◽  
Vol 10 (18) ◽  
pp. 6139-6151 ◽  
Author(s):  
Alberto Rodriguez-Gomez ◽  
Abhishek Dutta Chowdhury ◽  
Mustafa Caglayan ◽  
Jeremy A. Bau ◽  
Edy Abou-Hamad ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Vanadium Oxide ◽  
Oxidative Dehydrogenation ◽  
Active Sites ◽  
Coke Formation ◽  
Temperature Programmed Reduction ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Temperature Programmed ◽  
Oxidative Dehydrogenation Of Isobutane

We combine Raman spectroscopy, EPR, XPS, temperature programmed reduction, XRD, 51V MAS ssNMR, TEM and N2-physisorption to unravel structure–activity relationships during the non-oxidative dehydrogenation of isobutane over a V based catalyst.

scholarly journals Raman Spectroscopy Differentiates Each Tissue from the Skin to the Spinal Cord

2016 ◽  
Vol 125 (4) ◽  
pp. 793-804 ◽  
Author(s):  
T. Anthony Anderson ◽  
Jeon Woong Kang ◽  
Tatyana Gubin ◽  
Ramachandra R. Dasari ◽  
Peter T. C. So
Keyword(s):  
Raman Spectroscopy ◽  
Real Time ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Ex Vivo ◽  
Needle Insertion ◽  
Reflectance Spectroscopy ◽  
Epidural Needle ◽  
Needle Placement ◽  
Porcine Tissue

Abstract Background Neuraxial anesthesia and epidural steroid injection techniques require precise anatomical targeting to ensure successful and safe analgesia. Previous studies suggest that only some of the tissues encountered during these procedures can be identified by spectroscopic methods, and no previous study has investigated the use of Raman, diffuse reflectance, and fluorescence spectroscopies. The authors hypothesized that real-time needle-tip spectroscopy may aid epidural needle placement and tested the ability of spectroscopy to distinguish each of the tissues in the path of neuraxial needles. Methods For comparison of detection methods, the spectra of individual, dissected ex vivo paravertebral and neuraxial porcine tissues were collected using Raman spectroscopy (RS), diffuse reflectance spectroscopy, and fluorescence spectroscopy. Real-time spectral guidance was tested using a 2-mm inner-diameter fiber-optic probe-in-needle device. Raman spectra were collected during the needle’s passage through intact paravertebral and neuraxial porcine tissue and analyzed afterward. The RS tissue signatures were verified as mapping to individual tissue layers using histochemical staining and widefield microscopy. Results RS revealed a unique spectrum for all ex vivo paravertebral and neuraxial tissue layers; diffuse reflectance spectroscopy and fluorescence spectroscopy were not distinct for all tissues. Moreover, when accounting for the expected order of tissues, real-time Raman spectra recorded during needle insertion also permitted identification of each paravertebral and neuraxial porcine tissue. Conclusions This study demonstrates that RS can distinguish the tissues encountered during epidural needle insertion. This technology may prove useful during needle placement by providing evidence of its anatomical localization.

scholarly journals Detecting the NIR Fingerprint of Colors: The Characteristic Response of Modern Blue Pigments

Heritage ◽  
2019 ◽  
Vol 2 (3) ◽  
pp. 2255-2261 ◽  
Author(s):  
Yivlialin ◽  
Galli ◽  
Raimondo ◽  
Martini ◽  
Sassella
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Composite Sample ◽  
Model Composite ◽  
Non Invasive ◽  
Uv Visible ◽  
Invasive Techniques

Reflectance spectroscopy in the ultraviolet (UV), visible (Vis), and near infrared (NIR) range is widely applied to art studies for the characterization of paints and pigments, with the advantages of non-invasive techniques. Isolating and detecting the fingerprint of pigments, especially in the NIR range, is quite challenging, since the presence of vibrational transitions of the most common organic functional groups prevents to relate the optical spectrum of a composite sample, as an artwork is, to each one of its elements (i.e., support, binder, and specific pigment). In this work, a method is presented to obtain the UV-Vis-NIR optical response of the single components of a model composite sample reproducing an artwork, i.e., the support, the binder, and the pigment or dye, by using diffuse reflectance spectroscopy. This allowed us to obtain the NIR spectral fingerprint of blue pigments and to identify specific features possibly applicable for detecting cobalt and phthalocyanine blue colors in artwork analysis.

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