My watch list
my.chemeurope.com  
Login  

Network Deconstruction Reveals Network Structure in Responsive Microgels

Detailed characterization of hydrogel particle erosion revealed critical physicochemical differences between spheres, where network decomposition was informative of network structure. Real-time, in situ monitoring of the triggered erosion of colloidal hydrogels (microgels) was performed via multiangle light scattering. The solution-average molar mass and root-mean-square radii of eroding particles were measured as a function of time for microgels prepared from N-isopropylacrylamide (NIPAm) or N-isopropylmethacrylamide (NIPMAm), copolymerized with a chemically labile cross-linker (1,2-dihydroxylethylene)bisacrylamide (DHEA). Precipitation polymerization was employed to yield particles of comparable dimensions but with distinct topological features. Heterogeneous cross-linker incorporation resulted in a heterogeneous network structure for pNIPAm microgels. During the erosion reaction, mass loss proceeded from the exterior toward the interior of the polymer. In contrast, pNIPMAm microgels had a more homogene...

Authors:   Michael H. Smith; Emily S. Herman; L. Andrew Lyon
Journal:   Journal of Physical Chemistry B
Year:   2011
DOI:   10.1021/jp111634k
Publication date:   22-Mar-2011
Facts, background information, dossiers
More about American Chemical Society Publications
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE