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    STUDIA CHEMIA - Issue no. 3 / 2011  
         
  Article:   PREPARATION, CHARACTERIZATION AND SOLID STATE NMR INVESTIGATION OF A DYE-CONTAINING SMECTITE CLAY.

Authors:  BORSACCHI SILVIA, GEPPI MARCO, RICCI LUCIA, CARDELLI ANGELA, RUGGERI GIACOMO. 		 
       
         
  Abstract:  This paper presents the preparation and characterization of the smectite clay Laponite modified by intercalation of dimethyldioctadecylammonium chloride and the cationic dye methylene blue. The modified clay (Laponite Blue) has been characterized by FT-IR, X-Ray diffraction, thermogravimetric analysis, SEM and solid state NMR. The exploitation of several characterization techniques and of an extended multinuclear and multi-technique solid state NMR approach allowed us to obtain detailed information on the intercalation of the dye in the clay and the structural and dynamic properties of the organic-inorganic interface between the clay surface and the organic modifiers. Laponite Blue appears interesting for the future preparation of polymer nanocomposites with good mechanical and barrier performances as well as exploitable optical properties.

Keywords: Laponite, methylene blue, cation exchange, MAS NMR, CP dynamics 		 
         
     
         
         
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