Probing nanoscale chemical segregation and surface properties of antifouling hybrid xerogel films.
Over the past decade there has been significant development in hybrid polymer coatings exhibiting tunable surface morphology, surface charge, and chemical segregation-all believed to be key properties in antifouling (AF) coating performance. While a large body of research exists on these materials, there have yet to be studies on all the aforementioned properties in a colocalized manner with nanoscale spatial resolution. Here, we report colocalized atomic force microscopy, scanning Kelvin probe microscopy, and confocal Raman microscopy on a model AF xerogel film composed of 1:9:9 (mol:mol:mol) 3-aminopropyltriethoxysilane (APTES), n-octyltriethoxysilane (C8), and tetraethoxysilane (TEOS) formed on Al2O3. This AF film is found to consist of three regions that are chemically and physically unique in 2D and 3D across multiple length scales: (i) a 1.5 μm thick base layer derived from all three precursors; (ii) 2-4 μm diameter mesa-like features that are enriched in free amine (from APTES), depleted in the other species and that extend 150-400 nm above the base layer; and (iii) 1-2 μm diameter subsurface inclusions within the base layer that are enriched in hydrogen-bonded amine (from APTES) and depleted in the other species.
Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States.
Joel F
JF
Destino
Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States.
Caitlyn M
CM
Gatley
Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States.
Andrew K
AK
Craft
Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States.
Michael R
MR
Detty
Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States.
Frank V
FV
Bright
D008567:Membranes, Artificial; D018625:Microscopy, Atomic Force; D049329:Nanostructures / Q000737:chemistry*; D011437:Propylamines / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D013499:Surface Properties
D008567:Membranes, Artificial; D011437:Propylamines; D012821:Silanes; C040733:tetraethoxysilane; C477625:amino-propyl-triethoxysilane; C514699:octyltriethoxysilane