Monolayers having large in-plane dipole moments: characterization of sulfone-containing self-assembled monolayers of alkanethiols on gold by Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy and wetting

Langmuir ◽  
1991 ◽  
Vol 7 (11) ◽  
pp. 2700-2709 ◽  
Author(s):  
Stephen D. Evans ◽  
Kim E. Goppert-Berarducci ◽  
Edward. Urankar ◽  
Louis J. Gerenser ◽  
Abraham. Ulman ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Dipole Moments ◽  
Fourier Transform Infrared ◽  
Self Assembled Monolayers ◽  
X Ray ◽  
Assembled Monolayers

scholarly journals Comprehension of paraquat adsorption on faujasite zeolite X and Y in sodium form

2017 ◽  
Vol 36 (1-2) ◽  
pp. 684-693 ◽  
Author(s):  
Wina Rongchapo ◽  
Chalermpan Keawkumay ◽  
Nattawut Osakoo ◽  
Krittanun Deekamwong ◽  
Narong Chanlek ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Fourier Transform Infrared ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Magic Angle ◽  
Zeolite X ◽  
X Ray

The nature of paraquat adsorption is compared between zeolite NaX and NaY which have the same faujasite structure but different Si/Al ratio, namely 1.2 and 2.2, respectively. The adsorption was proposed to occur via ion exchange and expected to increase with Al content. However, NaX had a lower paraquat adsorption capacity than NaY. The bare and paraquat-containing zeolites (PQX and PQY) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, N2 adsorption–desorption analysis, magic-angle spinning nuclear magnetic resonance (MAS) NMR, and X-ray photoelectron spectroscopy. The presence of adsorbed paraquat was confirmed by Fourier transform infrared spectroscopy. Paraquat adsorbed in supercages of the zeolites resulting in a decrease of surface area and displacement of sodium cations. Results from 23Na MAS NMR and X-ray photoelectron spectroscopy indicated that interaction of sodium ions in the cavity of NaX was stronger than that in NaY, making it less exchangeable with paraquat.

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