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. 2010 Mar 5;22(9):994-8.
doi: 10.1002/adma.200903054.

Reactive layer-by-layer assembly of suspended thin films and semipermeable membranes at interfaces created between aqueous and organic phases

Maren E Buck  1 , David M Lynn
Affiliations

Reactive layer-by-layer assembly of suspended thin films and semipermeable membranes at interfaces created between aqueous and organic phases

Maren E Buck et al. Adv Mater. .
No abstract available

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Figures

Figure 1
Figure 1
Illustration depicting reactive layer-by-layer fabrication of suspended thin films at aqueous/organic interfaces. A) The end of a water-filled glass capillary is dipped briefly into a solution of PEI dissolved in dichloromethane. Subsequent immersion into a solution of PVDMA facilitates reactive deposition of a thin layer of PVDMA. B) Repetition of this process results in the assembly of covalently crosslinked multilayers across the end of the capillary. C) Removal of the water from within the capillary tube results in a reactive thin film suspended across the end of the capillary. (For a color version of this figure, see Figure S2 of the Supporting Information.)
Figure 2
Figure 2
A,B) SEM images showing the end of a glass capillary tube coated with an thin PEI/PVDMA film. C) Fluorescence microscopy image of the end of a coated capillary tube after treatment with TMR-cad. D,E) SEM images of a cross-section of a film fabricated over the end of a capillary tube that was intentionally perforated prior to imaging, showing (D) the side of the film exposed to organic solutions during fabrication and (E) the side of the film exposed to the aqueous phase during fabrication. F,G) SEM images of the end of a microcapillary coated with a 30-bilayer PEI/PVDMA film. H) Digital photograph of a film fabricated over the large end of a Pasteur pipette (right); an uncoated pipette (left) is included for comparison. I) Side-on, phase-contrast microscopy image of the end of a capillary tube coated with an invaginated film fabricated by control over the shape of the aqueous/organic meniscus during fabrication (see text). J) Image of the film depicted in (I) shown to be protruding, or inverted, after the application of pressure to the open end of a water-filled capillary. K) Removal of pressure from the film shown in (J) results in deflection of the film back into the capillary. Scale bars correspond to 200 μm (A,B), 500 μm (C), 10 μm (D,E), 40 μm (F), 50 μm (G), scale in cm (H), 500 μm (I-K). (For a color version of this figure, see Figure S3 of the Supporting Information.)
Figure 3
Figure 3
A) Chemical structures of the fluorescent molecules used in diffusion/release experiments. B) Plot of solution absorbance (measured using UV-vis) over time for capillaries filled with solutions of coumarin (filled triangles), TMR (filled circles), or PSS-MRhoB (open squares). Experiments were performed at 37°C using capillaries with open ends coated with a PEI/PVDMA membrane 30 bilayers thick. C) Plot of solution absorbance versus time for the release from capillaries filled with two-component mixtures of coumarin, TMR, or PSS-MRhoB (see legend).
Scheme 1
Scheme 1
Schematic representation of the reaction of a primary amine-functionalized compound with an azloactone-functionalized polymer
See this image and copyright information in PMC

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