Dynamics of Intercalation/De-Intercalation of Rhodamine B during the Polymorphic Transformation of CdAl Layered Double Hydroxide to the Brucite-Like Cadmium Hydroxide
Type
ArticleKAUST Department
Advanced Membranes and Porous Materials Research CenterChemical Science Program
Imaging and Characterization Core Lab
NMR
Physical Science and Engineering (PSE) Division
Smart Hybrid Materials (SHMs) lab
Date
2016-07-06Online Publication Date
2016-07-06Print Publication Date
2016-08-03Permanent link to this record
http://hdl.handle.net/10754/614886
Metadata
Show full item recordAbstract
Cadmium-Aluminum layered double hydroxide (CdAl LDH) is thermodynamically unstable and transforms to Cd(OH)2 and Al(OH)3 in a short period of time. We present a reaction-diffusion framework that enables us to use in situ steady-state fluorescence spectroscopy to study the kinetics of intercalation of a fluorescent probe (Rhodamine B (RhB)) during the formation of the CdAl LDH and its de-intercalation upon the conversion of the LDH phase to the β phase (Cd(OH)2). The method involves the diffusion of sodium hydroxide into a hydrogel gel matrix containing the aluminum and cadmium ions as well as the species we wish to incorporate in the interlayers of the LDH. The existence of RhB between the LDH layers and its expel during the transition into the β phase are proved via fluorescence microscopy, XRD and ssNMR. The activation energies of intercalation and de-intercalation of RhB are computed and show dependence on the cationic ratio of the corresponding LDH. We find that the energies of de- intercalation are systematically higher than those of intercalation proving that the dyes are stabilized due to the probe-brucite sheets interactions.Citation
Dynamics of Intercalation/De-Intercalation of Rhodamine B during the Polymorphic Transformation of CdAl Layered Double Hydroxide to the Brucite-Like Cadmium Hydroxide 2016 Crystal Growth & DesignSponsors
DS and MG gratefully acknowledge the funding provided by the American University of Beirut Research Board and by the Lebanese National Council for Scientific Research (LCNSR).Publisher
American Chemical Society (ACS)Journal
Crystal Growth & DesignAdditional Links
http://pubs.acs.org/doi/abs/10.1021/acs.cgd.6b00455ae974a485f413a2113503eed53cd6c53
10.1021/acs.cgd.6b00455