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http://hdl.handle.net/2289/3909
Title: | Discotic Mesogen - DNA complex films at interfaces |
Authors: | Suresh, K.A. Nayak, Alpana |
Keywords: | current-sensing AFM langmuir-Blodgett films mesogen - DNA complex nanoscale electrical conductivity |
Issue Date: | 8-Sep-2009 |
Publisher: | Taylor & Francis |
Citation: | Molecular Crystals and Liquid Crystals, 2009, Vol.512, p57-80 |
Abstract: | In this article, we review our studies on discotic mesogen - DNA complex films at interfaces. Discotic molecules are known to form highly anisotropic structures at the air-water (A-W) interface. We have studied films of a novel ionic discotic mesogenic molecule, pyridinium salt tethered with hexaalkoxytriphenylene (PyTp) and its complex with DNA (PyTp-DNA) at A-W and air-solid interfaces. The PyTp monolayer was formed on the aqueous subphase containing small amount of DNA. The electrostatic interaction between PyTp and DNA molecules results in a PyTp-DNA complex monolayer. Compared to the pure PyTp monolayer, the PyTp-DNA complex monolayer exhibits higher collapse pressure and lower limiting area. Surface manometry and Brewster angle microscope studies of the PyTp-DNA complex monolayer film indicate the molecules to be in the edge-on configuration. With increase in surface pressure, the complex monolayer undergoes a transition from a loosely packed monolayer phase to a compactly packed monolayer phase. The PyTp-DNA complex films on silicon wafers were prepared using Langmuir-Blodgett (LB) technique. We find that several tens of layers of PyTp-DNA complex monolayer can be transferred with good efficiency. We have carried out nanoscale electrical conductivity measurements for the pure PyTp and PyTp-DNA complex LB films using current sensing atomic force microscope. We have studied the current-voltage (I-V) characteristics for the metal-LB film-metal junction and our analysis shows that the I-V curves followed the Fowler-Nordheim tunneling model. |
Description: | Restricted Access. |
URI: | http://hdl.handle.net/2289/3909 |
ISSN: | 1563-5287 (Online) 1542-1406 |
Alternative Location: | http://dx.doi.org/10.1080/15421400903050459 |
Copyright: | 2009 Taylor & Francis |
Appears in Collections: | Research Papers (SCM) |
Files in This Item:
File | Description | Size | Format | |
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2009_MCLC_V512_p57.pdf Restricted Access | Restricted Access | 2.65 MB | Adobe PDF | View/Open Request a copy |
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