By Xu Hou

In this thesis, the writer introduces numerous bio-inspired shrewdpermanent nanochannel structures. a method for layout and coaching of novel synthetic responsive symmetric/asymmetric unmarried nanochannel structures lower than numerous symmetric/asymmetric stimuli is gifted for the 1st time. The author’s learn paintings makes use of ion tune etching polymer nanochannels with varied shapes as examples to illustrate the feasibility of the layout approach for development novel man made practical nanochannels utilizing numerous symmetric/asymmetric physicochemical alterations. the improvement of those nanochannels and their strength functions is a burgeoning new region of analysis, and a few intriguing breakthroughs could be expected within the close to destiny from the innovations and effects pronounced during this thesis. learn into man made useful nanochannels maintains to force new advancements of assorted real-world functions, resembling biosensors, strength conversion structures and nanofluidic units. The paintings during this thesis has resulted in greater than 15 courses in high-profile journals.

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Extra resources for Bio-inspired Asymmetric Design and Building of Biomimetic Smart Single Nanochannels

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This hypothesis can be supported by the observation that I–V curves as the magnitudes of the on-state currents in Fig. 28a decrease with increasing DNA chain length. This is because even in the on-state, the DNA chains partially occlude the mouth of the nanochannel and increase the nanochannel resistance. Karhanek et al. also developed a poly-L-lysine coated glass nanopore, which could dramatically change the ionic current response to an identical applied voltage [24]. Recently, another single conical nanochannels were developed by Siwy’s group with tunable ionic rectification properties achieved by a metal gate situated at the narrow entrance of the channels [20].

Copyright 2009 American Chemical Society. 1 M KCl solution. Reproduced from Ref. [38] by permission of John Wiley & Sons Ltd. c I–V properties of the single nanochannel before and after plasma asymmetric chemical modification under different pH conditions. Reproduced from Ref. [82] by permission of John Wiley & Sons Ltd wall. The surface charge of the nanochannel can be directly influenced by different pH. At pH 6–8, both carboxyl and amine covered parts of the channel wall were charged, forming ‘‘+–+’’ state, and the transistor characteristics were very distinct (Fig.

25b, asymmetry in the I–V curves is observed at 25 °C, showing ionic rectifying behavior. But the I–V curves became linear when the temperature was elevated to about 40 °C, indicating that the nanochannel no longer rectifies the ionic current. The current rectifying properties have been also observed in the control experiments on a gold-coated nanochannel without PNIPA modification (Fig. 25c), whereas the current rectification ratio in control experiments did not show significant change in response to the temperature.

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