Bio-inspired Asymmetric Design and Building of Biomimetic by Xu Hou

By Xu Hou

In this thesis, the writer introduces quite a few bio-inspired clever nanochannel structures. a method for layout and practise of novel man made responsive symmetric/asymmetric unmarried nanochannel structures below a variety of symmetric/asymmetric stimuli is gifted for the 1st time. The author’s learn paintings makes use of ion song etching polymer nanochannels with diversified shapes as examples to illustrate the feasibility of the layout technique for construction novel synthetic sensible nanochannels utilizing quite a few symmetric/asymmetric physicochemical variations. the improvement of those nanochannels and their capability functions is a burgeoning new zone of analysis, and a few intriguing breakthroughs could be expected within the close to destiny from the suggestions and effects mentioned during this thesis. study into man made sensible nanochannels keeps to force new advancements of assorted real-world functions, akin to 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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14 M KCl for the same uncoated b and coated, c nanopore under different pH conditions. Reprinted with the permission from Ref. [109]. Copyright 2007 American Chemical Society was observed at the same ion concentration. 8 to 10. This asymmetric ionic transport property is caused by asymmetric chemical modification, which results in structural asymmetry and non-uniform chemical composition of the nanochannel. Once artificial inorganic nanopores/nanochannels are prepared, it is difficult to directly control ionic transport properties inside the pores or channels, due to the physicochemical properties of inorganic materials.

127] by permission of The Royal Society of Chemistry the hybridization of the complementary DNA strands with G4 DNA resulted in a sharp decrease in the currents, it still kept an increasing trend. Before G4 DNA modification and after the hybridization, the current change of the nanochannel via the concentration at different states upon the addition of K+ indicated an increasing trend similar to Li+. There was a remarkable difference after DNA modification for K+. This nonlinear response phenomenon could be attributed to the formation of G4 structures that induced the relatively dense packing of DNA molecules on the inner wall of the nanochannel, resulting in an efficient decrease of the effective size and thus the current change.

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. Although the ionic current rectification ratio of this composite channel is not high, it can be further enhanced by potentiostatically controlling the surface potential of the gold membrane [65]. Fig. 25 a Temperature dependence of the ionic current through the PNIPA-modified single metal-polymer nanochannel.

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