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- W2035609599 abstract "We report the formation of highly organized fibrous networks on ∼50 nm thick oligomeric films of hydrolyzed γ-(aminopropyl)triethoxysilane (γ-APS) adsorbed on Na+-containing substrates. The growth of these nanostructures is dependent on the surface segregation of Na+ ions and exposure to ambient conditions. Using an atomic force microscope (AFM), we have followed the growth characteristics of the fibrous nanostructures in a time-resolved manner. The fibers, which grow 2-dimensionally, have a uniform height of approximately 3 nm and widths varying from a few nanometers to hundreds of nanometers. The AFM further shows that each individual fiber consists of a well-ordered parallel assembly of “nanostrands” with widths of approximately 8 nm and a peak-to-valley corrugation of approximately 0.4 nm. Changes in the chemical nature of the APS films as a function of film age were characterized by X-ray photoelectron spectroscopy (XPS) and transmission infrared spectroscopy (IR). Results indicate that the amine (NH2) functionality on the surface of the film reacts with atmospheric CO2 and H2O to form n-propyl carbamate species (NHCOO-). To explain the fiber growth, we postulate that the diffusing Na+ ions participate in acid−base interactions within the film leading to the formation of small γ-APS oligomers capped with NHCOO- and NH2 functional groups. The stabilization of the NHCOO- species by Na+ ions leads to self-assembly via hydrogen bonding and electrostatic interactions." @default.
- W2035609599 created "2016-06-24" @default.
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- W2035609599 date "2000-11-15" @default.
- W2035609599 modified "2023-09-23" @default.
- W2035609599 title "Self-Organized Fibrous Nanostructures on Poly[(aminopropyl)siloxane] Films Studied by Atomic Force Microscopy" @default.
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- W2035609599 doi "https://doi.org/10.1021/la000966o" @default.
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