Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
Clay Minerals Don't get GSW? Talk to your librarian.
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Clay Minerals; December 1997; v. 32; no. 4; p. 653-663
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Garfinkel-Shweky, D.
Right arrow Articles by Yariv, S.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Metachromasy in clay-dye systems; the adsorption of acridine orange by Na-saponite

D. Garfinkel-Shweky, and S. Yariv

Hebrew University of Jerusalem, Department of Inorganic and Analytical Chemistry, Jerusalem, Israel

The adsorption of the cationic dye acridine orange (AO) by Na-saponite and the colloidal properties of the aqueous suspension were investigated by visible spectroscopy and XRD. The organic cation is adsorbed by the mechanism of cation exchange. When small amounts of the dye are adsorbed, the system contains small tactoids and is peptized. At this stage the dye penetrates into the interlayer space and most of it undergoes metachromasy due to interactions between the aromatic entity and the oxygen plane of the clay. When greater amounts of AO are adsorbed, the clay platelets flocculate to form book-house flocs which, with excess AO, are transformed into card-house flocs. At this stage metachromasy results from the aggregation of the dye in the interparticle space of the flocs, in addition to the pi interactions with the oxygen plane. In excess AO, the clay is gradually peptized. At this stage the dispersed clay platelets form small tactoids with monomeric AO in the interlayer space and at the same time adsorb dimeric and polymeric AO cationic species at the solid-liquid interface.

This record provided courtesy of AGI/GeoRef.




This article has been cited by other articles:


Home page
 Clay MineralsHome page
Z. Yermiyahu, Z. YERMIYAHU, I. LAPIDES, and S. YARIV
Visible absorption spectroscopy study of the adsorption of Congo Red by montmorillonite
Clay Minerals, December 1, 2003; 38(4): 483 - 500.
[Abstract] [Full Text] [PDF]

Home page
 Clays and Clay MineralsHome page
J. Bujdak, J. Bujdak, and N. Iyi
VISIBLE SPECTROSCOPY OF CATIONIC DYES IN DISPERSIONS WITH REDUCED-CHARGE MONTMORILLONITES
Clays and Clay Minerals, August 1, 2002; 50(4): 446 - 454.
[Abstract] [Full Text] [PDF]

Home page
 Clay MineralsHome page
J. BUJDAK, N. IYI, and T. FUJITA
The aggregation of methylene blue in montmorillonite dispersions
Clay Minerals, March 1, 2002; 37(1): 121 - 133.
[Abstract] [Full Text] [PDF]

Home page
 Clays and Clay MineralsHome page
C.-H. Yu, C.-H. Yu, S. Q. Newton, M. A. Norman, D. M. Miller, L. Schafer, and B. J. Teppen
MOLECULAR DYNAMICS SIMULATIONS OF THE ADSORPTION OF METHYLENE BLUE AT CLAY MINERAL SURFACES
Clays and Clay Minerals, December 1, 2000; 48(6): 665 - 681.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2008 by Mineralogical Society of Great Britain and Ireland