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Some aspects of formation and tribological properties of silver nanodumbbells.

Polyakov B, Vlassov S, Dorogin LM, Novoselska N, Butikova J, Antsov M, Oras S, Lohmus R, Kink I - Nanoscale Res Lett (2014)

Bottom Line: The mechanism of ND formation is proposed and illustrated with finite element method simulations.The geometry of NDs enables to distinguish between different types of motion, i.e. rolling, sliding and rotation.Real contact areas are calculated from the traces left after the displacement of NDs and compared to the contact areas predicted by the contact mechanics and frozen droplet models. 81.07.-b; 62.25.-g; 62.23.Hj.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Solid State Physics, University of Latvia, Kengaraga str. 8, Riga LV-1063, Latvia.

ABSTRACT

Unlabelled: In this paper, metal nanodumbbells (NDs) formed by laser-induced melting of Ag nanowires (NWs) on an oxidized silicon substrate and their tribological properties are investigated. The mechanism of ND formation is proposed and illustrated with finite element method simulations. Tribological measurements consist in controllable real-time manipulation of NDs inside a scanning electron microscope (SEM) with simultaneous force registration. The geometry of NDs enables to distinguish between different types of motion, i.e. rolling, sliding and rotation. Real contact areas are calculated from the traces left after the displacement of NDs and compared to the contact areas predicted by the contact mechanics and frozen droplet models.

Pacs: 81.07.-b; 62.25.-g; 62.23.Hj.

No MeSH data available.


Nanostructures produced by laser processing of Ag NWs. NWs with end bulb, NDs of different length and spherical particles are typically produced (a-c). Partial rising of NDs from the substrate, imaged at 52° SEM stage tilt (d). Central part of Ag NDs is completely suspended, imaged at 45° (e). Ag ND rests on one bulb only, imaged at 45° (f).
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Figure 1: Nanostructures produced by laser processing of Ag NWs. NWs with end bulb, NDs of different length and spherical particles are typically produced (a-c). Partial rising of NDs from the substrate, imaged at 52° SEM stage tilt (d). Central part of Ag NDs is completely suspended, imaged at 45° (e). Ag ND rests on one bulb only, imaged at 45° (f).

Mentions: SEM investigation revealed that after laser processing, most of the Ag NWs have rounded ends (end bulbs), and a large number of spherical NPs and some NDs were produced (Figure 1). Similar nanostructures can be produced by laser processing of Au NWs (Additional file 1: Figure S1). ND formation is a complicated dynamic process, which involves extreme temperature gradients, and includes rapid heating and melting of the ends of NWs, contraction of liquid droplets into spheroidal bulbs and followed by rapid solidification.


Some aspects of formation and tribological properties of silver nanodumbbells.

Polyakov B, Vlassov S, Dorogin LM, Novoselska N, Butikova J, Antsov M, Oras S, Lohmus R, Kink I - Nanoscale Res Lett (2014)

Nanostructures produced by laser processing of Ag NWs. NWs with end bulb, NDs of different length and spherical particles are typically produced (a-c). Partial rising of NDs from the substrate, imaged at 52° SEM stage tilt (d). Central part of Ag NDs is completely suspended, imaged at 45° (e). Ag ND rests on one bulb only, imaged at 45° (f).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4022052&req=5

Figure 1: Nanostructures produced by laser processing of Ag NWs. NWs with end bulb, NDs of different length and spherical particles are typically produced (a-c). Partial rising of NDs from the substrate, imaged at 52° SEM stage tilt (d). Central part of Ag NDs is completely suspended, imaged at 45° (e). Ag ND rests on one bulb only, imaged at 45° (f).
Mentions: SEM investigation revealed that after laser processing, most of the Ag NWs have rounded ends (end bulbs), and a large number of spherical NPs and some NDs were produced (Figure 1). Similar nanostructures can be produced by laser processing of Au NWs (Additional file 1: Figure S1). ND formation is a complicated dynamic process, which involves extreme temperature gradients, and includes rapid heating and melting of the ends of NWs, contraction of liquid droplets into spheroidal bulbs and followed by rapid solidification.

Bottom Line: The mechanism of ND formation is proposed and illustrated with finite element method simulations.The geometry of NDs enables to distinguish between different types of motion, i.e. rolling, sliding and rotation.Real contact areas are calculated from the traces left after the displacement of NDs and compared to the contact areas predicted by the contact mechanics and frozen droplet models. 81.07.-b; 62.25.-g; 62.23.Hj.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Solid State Physics, University of Latvia, Kengaraga str. 8, Riga LV-1063, Latvia.

ABSTRACT

Unlabelled: In this paper, metal nanodumbbells (NDs) formed by laser-induced melting of Ag nanowires (NWs) on an oxidized silicon substrate and their tribological properties are investigated. The mechanism of ND formation is proposed and illustrated with finite element method simulations. Tribological measurements consist in controllable real-time manipulation of NDs inside a scanning electron microscope (SEM) with simultaneous force registration. The geometry of NDs enables to distinguish between different types of motion, i.e. rolling, sliding and rotation. Real contact areas are calculated from the traces left after the displacement of NDs and compared to the contact areas predicted by the contact mechanics and frozen droplet models.

Pacs: 81.07.-b; 62.25.-g; 62.23.Hj.

No MeSH data available.