Fibrillization nanostructure formation

Within the scope of thermoelectric nanostructures, Sima et al. [161] prepared nanorod (fibril) and microtube (tubule) arrays of PbSei. , Tej by potentiostatic electrodeposition from nitric acid solutions of Pb(N03)2, H2Se03, and Te02, using a 30 fim thick polycarbonate track-etch membrane, with pores 100-2,000 nm in diameter, as template (Cu supported). After electrodeposition the polymer membrane was dissolved in CH2CI2. Solid rods were obtained in membranes with small pores, and hollow tubes in those with large pores. The formation of microtubes rather than nanorods in the larger pores was attributed to the higher deposition current. 

It is known that many proteins and peptides aggregate into extended p sheet like structures [3], Formation of amyloid fibrils is recognized important not only in understanding of human diseases but also is found acceptable for development of ordered nanostructures with modifiable properties and applicable in biotechnology, material science, molecular electronics and related fields. 

Stupp and collaborators have used the reversible pH-induced self-assembly of peptide-amphiphiles to make nanostructured fibrous scaffold reminiscent of extracellular matrix. These fibers can be cross-linked by formation of intermolecular disulfide oxidation that reinforce the supramolecular assembly by covalent capture which is also made reversible by possible reduction to the thiol function. After cross-linking, the fibers are able to direct mineralization of hydroxyapatite to form a composite material in which the crystallographic c axes are aligned with the long axes of the fibers, which is similar to collagen fibrils and hydroxyapatite crystals in bone (Figure 12)." ... 

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