Templated magnetic assembly

Figure 14.1 Template-directed synthesis of conducting-polymer nanowires. Nanowires of PPy were synthesised by electropolymerization within an alumina template structure with a gold electrode base (A,B). Nanowires could be further functionalized by the growth of additional species such as nickel and gold (C). (Reprinted with permission from Electroanalysis, Magnetically Assembled Multisegmented Nanowires and Their Applications by M. A. Bangar, C. M. Hangarter, B. Yoo et al., 21, 1, 61-67. Copyright (2009) Wiley-VCH)...

The foregoing results demonstrate that the thickness of the capsule wall can be controlled at the nanometer level by varying the number of deposition cycles, while the shell size and shape are predetermined by the dimensions of the templating colloid employed. This approach has recently been used to produce hollow iron oxide, magnetic, and heterocomposite capsules [108], The fabrication of these and related capsules is expected to open up new areas of applications, particularly since the technology of self-assembly and colloidal templating allows unprecedented control over the geometry, size, diameter, wall thickness, and composition of the hollow capsules. This provides a means to tailor then-properties to meet the criteria of certain applications. 

In 2004, Olayo-Valles et al. described a related dry-etch processing of self-assembled block copolymer films to generate porous materials for use as magnetic material templates [50]. These authors employed thin films of... 

Weekes SM, Ogrin FY, Murray WA et al (2007) Macroscopic arrays of magnetic nanostructures from self-assembled nanosphere templates. Langmuir 23(3) 1057-1060... 

The above discussions have highlighted the utility of both magnetic arrays and colloidal-templated crystals for DNA electrophoresis. While the variety of solid supports that can be fabricated by these techniques is limited when compared to those available through micro- and nanofabrication, the ease with which these self-assembled arrays can be constmcted confers significant advantages... 

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