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Biomimetic method to fabrication of metallic nanostructuredˆàmesoscopic models
RUS
10.04.2016  
  


Biomimetic method to fabrication of metallic nanostructuredˆàmesoscopic models

Strukovˆà Gennadyˆà V.,ˆà Strukovaˆà Galina K.

E-mail: strukova@issp.ac.ru

Metallicˆà nanostructured mesostructures are formed as a result of their self-assembly while growing of nanoclusters and nanowires during the pulsed current electrodeposition process on the membranes.

Our work shows that the pulsed current electrodeposition on the templates is a general biomimetic method to fabrication of metal models of natural objects: protozoa, plants, mushrooms, shells. The resulting metal copy reproduce the Benoit Mandelbrot classic natural fractals.

Pd-Ni alloy

We have shown the possibility to control mold shapes and found the conditions ensuring fabrication of a single type of shell-like convex-concave structures.

The inner surface of shellˆà is a picture ofˆà theˆà metallic electrospun,ˆà can beˆà seen theˆà grid lines of growthˆà as òÀÜmeridiansòÀÝ and òÀÜparallelsòÀÝ

The outer surface is formed by either òÀÜnanoflowers" or nanowires. In this case, the outer surface of the shell looks like a brush

Hypothesisˆàof morphogenesis:

We assume that pulsed growth on the membranes is a morphogenesisòÀÙ tool for mostˆà plants, mushrooms and shells

ˆà

Nature

Pd-Ni

We can definitely identify common features in the growth of mushrooms and plants and their metal models:

òÀâThe growth on theˆà membranes or templates

òÀâGrowth process is exercisedˆà by the accession of the materialˆà atˆà different points of growth. The location of these points affectsˆà the shape and causes a fractal branching

òÀâThe nature of the growth process is uneven or pulsed

òÀâThis pulsed growth is accompanied by a fractal branching and self-assembly of growing clusters (fibers) and provides a hierarchical structure

The alternating electrodeposition of PbIn and PdNi alloysˆà allowedˆàˆà to obtain a hybridˆàˆàˆà volumeˆà structure òÀÜfernòÀÝ. Arrow-like leaves formed by four orthogonal blades are situated along the stem; the blades consist in their turn of alternating submicron columns, which consist of spherical granules of 100-200ˆà nm.

The alternating electrodeposition ofˆà Pb and PdNi alloysˆà hollow metal structureˆà òÀÜsedumòÀÝ

The nanostructured mesostructures of the magnetic (Ni, Pd-Ni, Pd-Co), superconducting (Bi, Pb, Pb-In) and normal (Ag, Rh, Pd, Au, Cu) metalsˆà were obtained.

It is shown that our technique enables to reproduce no only the exterior shell form but also the hierarchic layer shell structure at the nano-and microscale.

Fragments of the shalls

The layered structure
of the shell

Fragments of the shell
hierarchical structure

Nanowiresˆà are material forˆà architectural
buildingˆà blocks

Layeredˆà packing of structural
fragments

Etching of the shell surface

Before etching After etching

Nanoscopic cells
of the shell skeleton

The nanostructured mesostructures of the magnetic,
superconducting and normal metalsˆà were obtained.
This gives prospects for fabrication of useful
"hybrid" structures andˆà nanodevices. Such objects
can be of interest for fundamental research of self-
assembly processes as well as for applications in
catalysis, electronics, optics, medicine, and for
fabrication of superhydrophobic surfaces.

ˆà

ˆà

 

Contact information

Tel.: 8(496)52 219-82
+7 906 095 4402

Fax: +7(496) 522 8160
8(496) 522 8160

Address: Institute of Solid State Physics RAS, Chernogolovka, Moscow District, 2 Academician Ossipyan str., 142432 Russia

E-mail:

WWW: www.issp.ac.ru


  
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