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Nanomechanics and Testing of Core-Shell Composite Ligaments for High Strength, Light Weight Foams

Published online by Cambridge University Press:  11 July 2017

Aiganym Yermembetova ,
Raheleh M. Rahimi ,
Chang-Eun Kim ,
Jack L. Skinner ,
Jessica M. Andriolo ,
John P. Murphy  and
David F. Bahr
Aiganym Yermembetova
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, IN 47907 U.S.A.
Raheleh M. Rahimi
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, IN 47907 U.S.A.
Chang-Eun Kim
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, IN 47907 U.S.A.
Jack L. Skinner
Affiliation:
Mechanical Engineering, Montana Tech, Butte, MT 59701 U.S.A. Montana Tech Nanotechnology Laboratory, Butte, MT 59701 U.S.A.
Jessica M. Andriolo
Affiliation:
Montana Tech Nanotechnology Laboratory, Butte, MT 59701 U.S.A.
John P. Murphy
Affiliation:
Montana Tech Nanotechnology Laboratory, Butte, MT 59701 U.S.A.
David F. Bahr*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, IN 47907 U.S.A.
*
*(Email: [email protected])
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Abstract

Composite nanostructured foams consisting of a metallic shell deposited on a polymeric core were formed by plating copper via electroless deposition on electrospun polycaprolactone (PCL) fiber mats. The final structure consisted of 1000-nm scale PCL fibers coated with 100s of nm of copper, leading to final core-shell thicknesses on the order of 1000-3000 nm. The resulting open cell, core-shell foams had relative densities between 4 and 15 %. By controlling the composition of the adjuncts in the plating bath, particularly the composition of formaldehyde, the relative thickness of copper coating as the fiber diameter could be controlled. As-spun PCL mats had a nominal compressive modulus on the order of 0.1 MPa; adding a uniform metallic shell increased the modulus up to 2 MPa for sub-10 % relative density foams. A computational materials science analysis using density functional theory was used to explore the effects pre-treatment with Pd may have on the density of nuclei formed during electroless plating.

Keywords

nano-indentationfoamcomposite
Type
Articles
Information
MRS Advances , Volume 2 , Issue 58-59: Nanomaterials , 2017 , pp. 3577 - 3583
Copyright
Copyright © Materials Research Society 2017 

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References

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