Field nanowire

There is considerable interest in developing new types of magnetic materials, with a particular hope that ferroelectric solids and polymers can be constructed— materials having spontaneous electric polarization that can be reversed by an electric field. Such materials could lead to new low-cost memory devices for computers. The fine control of dispersed magnetic nanostructures will take the storage and tunability of magnetic media to new levels, and novel tunneling microscopy approaches allow measurement of microscopic hysteresis effects in iron nanowires. 

Ju, S. Lee, K. Yoon, M.-H. Facchetti, A. Marks, T. J. Janes, D. B. 2007. High performance ZnO nanowire field effect transistors with organic gate nanodielec-... 

Cui, Y. Zhong, Z. Wang, D. Wang, W. U. Lieber, C. M. 2003. High performance silicon nanowire field effect transistors. Nano Lett. 3 149-152. 

The Russell group has applied the template synthesis approach to nanoporous films generated from UV-treated PS-fo-PMMA copolymers [43, 147,233,235,241], which were pre-aligned perpendicular to the substrate by an electric field. Through direct current electrodeposition, they fabricated high-density vertical arrays of ferromagnetic cobalt nanowires (Fig. 10a) [43]. Through subsequent work, they also demonstrated the successful replication... 

Fig. 10 Schematic representation of the nanoreplication processes from block copolymers, a Growth of high-density nanowires from a nanoporous block copolymer thin film. An asymmetric PS-fc-PMMA diblock copolymer was aligned to form vertical PMMA cylinders under an electric field. After removal of the PMMA minor component, a nanoporous film is formed. By electrodeposition, an array of nanowires can be replicated in the porous template (adapted from [43]). b Hexagonally packed array of aluminum caps generated from rod-coil microporous structures. Deposition of aluminum was achieved on the photooxidized area of the rod-coil honeycomb structure (Taken from [35])...

Lee J, Javed T, Skeini T, Govorov AO, Bryant GW, Kotov NA (2006) Bioconjugated Ag nanoparticles and CdTe nanowires metamaterials with field-enhanced light absorption. Angew Chem Int Ed 45 4819-4823... 

Hwang, ).0., et al., Vertical ZnO nanowires/graphene hybrids for transparent and flexible field emission. Journal of Materials Chemistry, 2011. 21(10) p. 3432-3437. 

Figure 1.34 Experimental setup showingthe nickel nanowires in a (A) horizontal and (B) vertical position depending on the magnetic field orientation. (Reprinted with permission from Ref. [171]. 2006 American Chemical Society.)...

Rgure 2.16. Long magnetic nanowires made by submitting a mixture of magnetic particles and PAA to a magnetic field. The chains are bent by gravity after field removal. (Reproduced with permission from [47].)... 

We have reviewed the state of the art of the synthesis and applications of metal/ alloy nanowires and nanoparticles by surface-mediated fabrication using different mesoporous silica templates. New nanoscale materials are appearing one after another by the use of many kinds of mesoporous materials as templates, and we are facing a rapid advance of this research field. So far, many studies have focused... 

Linic and co-workers provided two additional examples of modifying selectivity for the ethylene epoxidation reaction. They demonstrated the promotional effect of Cs on EO formation using DFT calculations Cs atoms increase AEa by up to 0.2 eV vs. Ag only, via an induced electric field that interacts with the different dipoles of the two TS s." More recently Christopher et al. synthesized and tested (100) facet-dominated Ag nanowire catalysts, based on the DFT results that AEa is ca. 0.1 eV larger on Ag(lOO) than on Ag(lll), because of the extra elongation of the Ag-adsorbate bonds required to form the TS to AC on Ag(lOO). The Ag nanowire catalysts were indeed more selective than conventional Ag catalysts, in which Ag particles mainly exposes the (111) facet." Incidentally,... 

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