Digital pulsed force mode AFM and confocal raman microscopy in drug-eluting coatings research

G. Haugstad, K. Wormuth

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


Controlled release of amorphous drug from a polymer matrix depends intimately upon the degree of mixing of drug and polymer, the susceptibility of the drug to crystallization, and the ability of the drug to dissolve and diffuse through water-swollen polymer. Characterization methods ideally would follow these processes on the molecular level in situ and in real time. We move closer to this ideal state of characterization through application of two imaging methods: digital pulsed force mode atomic force microscopy (D-PFM AFM) and confocal Raman microscopy (CRM). We examine model spin-coated films ∼1 μm thick containing the drug dexamethasone dispersed in poly(n-alkyl methacrylate) homopolymer and blend coatings. We report aqueous-immersion studies of surface and subsurface structural changes due to drug elution overtime frames ranging from very fast (a few minutes) to slow (tens of hours).

Original languageEnglish (US)
Title of host publicationAdvances in Spectroscopy and Imaging of Surfaces and Nanostructures
Number of pages6
StatePublished - 2011
Event2010 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 29 2010Dec 3 2010

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2010 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

Bibliographical note

Funding Information:
Support was provided by Surmodics, Inc., via its membership in the Industrial Partnership for Research in Interfacial and Materials Engineering at the University of Minnesota. Parts of this work were carried out in the University’s Characterization Facility (a Center within the College of Science and Engineering), which received partial support from the NSF through the NNIN and MRSEC programs.


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