Document Detail

Controlling diffusion in sol-gel derived monoliths.
MedLine Citation:
PMID:  15667155     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Redox probes were trapped within a silica monolith prepared in part with organoalkoxysilanes containing a quaternary ammonium functional group. The diffusion coefficients of the entrapped molecules were measured as the gels were slowly dried using chronoamperometry and cyclic voltammetry with ultramicroelectrodes. Gel-entrapped cobalt(II) tris(bipyridine) (Co(bpy)(3)(2+)) diffuses at rates similar to that measured in the sols by incorporating a small amount of the positively charged functional group in the matrix. In comparison, the diffusion coefficient of gel-entrapped ferricyanide (Fe(CN)(6)(3-)) drops an order of magnitude relative to its value in the sol soon after gelation. These results demonstrate the ease at which diffusion in hydrated gels can be easily controlled by simply changing the charge on the walls of the silica host.
Mandakini Kanungo; Maryanne M Collinson
Related Documents :
20831345 - Characterization and cytocompatibility of hybrid aminosilane-agarose hydrogel scaffolds.
21480625 - Characterization of translocation of silver nanoparticles and effects on whole-genome g...
19429275 - The synthesis of novel ph-sensitive poly(vinyl alcohol) composite hydrogels using a fre...
17508825 - Ultrafast optical kerr effect spectroscopy of water confined in nanopores of the gelati...
24607315 - Aeration efficiency over stepped cascades: better predictions from flow regimes.
23158305 - Multiple ph-responsive graphene composites by non-covalent modification with chitosan.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  21     ISSN:  0743-7463     ISO Abbreviation:  Langmuir     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-01-25     Completed Date:  2006-05-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  United States    
Other Details:
Languages:  eng     Pagination:  827-9     Citation Subset:  -    
Department of Chemistry, Kansas State University, Manhattan, KS 66506-3701, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Solvent-adaptable silver nanoparticles.
Next Document:  Micropatterning of cells using modulated magnetic fields.