PMID- 17217591
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20070207
LR  - 20070112
IS  - 0003-7028 (Print)
IS  - 0003-7028 (Linking)
VI  - 60
IP  - 12
DP  - 2006 Dec
TI  - Modification of kaolinite surfaces through mechanochemical activation with 
      quartz: A diffuse reflectance infrared fourier transform and chemometrics study.
PG  - 1414-22
AB  - Studies of kaolinite surfaces are of industrial importance. One useful method for 
      studying the changes in kaolinite surface properties is to apply chemometric 
      analyses to the kaolinite surface infrared spectra. A comparison is made between 
      the mechanochemical activation of Kiralyhegy kaolinites with significant amounts 
      of natural quartz and the mechanochemical activation of Zettlitz kaolinite with 
      added quartz. Diffuse reflectance infrared Fourier transform (DRIFT) spectra were 
      analyzed using principal component analysis (PCA) and multi-criteria decision 
      making (MCDM) methods, the preference ranking organization method for enrichment 
      evaluations (PROMETHEE) and geometrical analysis for interactive assistance 
      (GAIA). The clear discrimination of the Kiralyhegy spectral objects on the two PC 
      scores plots (400-800 and 800-2030 cm(-1)) indicated the dominance of quartz. 
      Importantly, no ordering of any spectral objects appeared to be related to 
      grinding time in the PC plots of these spectral regions. Thus, neither the 
      kaolinite nor the quartz are systematically responsive to grinding time according 
      to the spectral criteria investigated. The third spectral region (2600-3800 
      cm(-1), OH vibrations), showed apparent systematic ordering of the Kiralyhegy 
      and, to a lesser extent, Zettlitz spectral objects with grinding time. This was 
      attributed to the effect of the natural quartz on the delamination of kaolinite 
      and the accompanying phenomena (i.e., formation of kaolinite spheres and water). 
      The mechanochemical activation of kaolinite and quartz, through dry grinding, 
      results in changes to the surface structure. Different grinding times were 
      adopted to study the rate of destruction of the kaolinite and quartz structures. 
      This relationship (i.e., grinding time) was classified using PROMETHEE and GAIA 
      methodology.
FAU - Carmody, Onuma
AU  - Carmody O
AD  - Inorganic Materials Research Program, Queensland University of Technology, 2 
      George Street, GPO Box 2434, Brisbane Queensland 4001, Australia.
FAU - Frost, Ray L
AU  - Frost RL
FAU - Kristof, Janos
AU  - Kristof J
FAU - Kokot, Serge
AU  - Kokot S
FAU - Kloprogge, J Theo
AU  - Kloprogge JT
FAU - Mako, Eva
AU  - Mako E
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Appl Spectrosc
JT  - Applied spectroscopy
JID - 0372406
EDAT- 2007/01/16 09:00
MHDA- 2007/01/16 09:01
CRDT- 2007/01/16 09:00
PHST- 2007/01/16 09:00 [pubmed]
PHST- 2007/01/16 09:01 [medline]
PHST- 2007/01/16 09:00 [entrez]
AID - 10.1366/000370206779321472 [doi]
PST - ppublish
SO  - Appl Spectrosc. 2006 Dec;60(12):1414-22. doi: 10.1366/000370206779321472.