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Title: Discogen - DNA complex films at air-water and air-solid interfaces
Authors: Nayak, Alpana
Suresh, K.A.
Issue Date: Feb-2008
Publisher: American Chemical Society
Citation: Journal of Physical Chemistry B, 2008, Vol.112, p2930-2936
Abstract: We have studied films of an ionic discogenic (discotic mesogenic) molecule (pyridinium salt tethered with hexaalkoxytriphenylene (PyTp)) and DNA complex at air-water (A-W) and air-solid interfaces. We have formed an PyTp monolayer on an aqueous subphase containing a small amount of DNA to obtain a PyTp-DNA complex at the A-W interface. Compared to the pure PyTp monolayer, the PyTp-DNA complex monolayer exhibits a higher collapse pressure and lower limiting area, indicating condensation and better stability. A Brewster angle microscope was used for in situ observation of the morphology of the film at the A-W interface. The PyTp-DNA complex films on silicon wafers were prepared using the Langmuir-Blodgett (LB) technique. We find that several tens of layers of the PyTp-DNA complex monolayer can be transferred with good efficiency. Fourier transform infrared spectroscopy studies confirm the presence of DNA in the LB films of the PyTp-DNA complex. Nanoindentation measurements using atomic force microscope reveal that the PyTp-DNA complex films are about two times harder as compared to the pure PyTp films.
Description: Restricted Access.
ISSN: E-ISSN: 1520-5207
P-ISSN: 1520-6106
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Copyright: 2008 American Chemical Society
Appears in Collections:Research Papers (SCM)

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