Radio frequency plasma-induced hydrogen bonding on kaolinite

Ming, Hui and Spark, Kaye M. (2003) Radio frequency plasma-induced hydrogen bonding on kaolinite. Journal of Physical Chemistry B, 107 3: 694-702. doi:10.1021/jp025803i

Author Ming, Hui
Spark, Kaye M.
Title Radio frequency plasma-induced hydrogen bonding on kaolinite
Journal name Journal of Physical Chemistry B   Check publisher's open access policy
ISSN 1520-6106
Publication date 2003-01-23
Year available 2003
Sub-type Article (original research)
DOI 10.1021/jp025803i
Volume 107
Issue 3
Start page 694
End page 702
Total pages 9
Editor George C. Schatz
Place of publication Washington, D. C., U.S.A.
Publisher American Chemical Society
Collection year 2003
Language eng
Subject C1
300103 Soil Chemistry
770802 Land and water management
Abstract The radio frequency (RF) plasma-modified surfaces of kaolinite were investigated by diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) and deuteration techniques to determine the nature of RF plasma-induced surface functional groups, the altered sites in the lattice, and interaction mechanism between RF plasma and the surface of the kaolinite. It has been concluded that the RF plasma-induced infrared (IR) vibration absorption bands at 2805, 3010, and 3100 cm(-1) are attributable to the stretching vibration of hydrogen-bonded hydroxyl groups, and the band at 1407 cm(-1) is attributable to the bending vibration of (HO-)Al-O or (HO-)Si-O groupings with hydrogen-bonded hydroxyl groups. Structural alteration occurred on both the surface and subsurface region of the kaolinite during RF plasma treatment. Further structural alteration or adjustment was also observed on well-modified and well-deuterated kaolinite. There are two types of OD bands visible in the DRIFT spectra of this kaolinite, one type which decreased rapidly as a function of time in moist air, and the other which remained unchanged during the measurement. Furthermore, the appearance of broad IR bands at 3500-3100 cm(-1) as a result of deuteration is evidence of structural disturbance by RF plasma treatment lattice deuteration. An RF plasma-induced hydrogen bonding model on the surface of the kaolinite is proposed.
Keyword Chemistry, Physical
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 01:26:50 EST