General nanomoulding with bulk metallic glasses

Nanotechnology
Ze Liu, Jan Schroers

Abstract

Bulk metallic glasses (BMGs) are ideal for nanomoulding as they possess desirable strength for molds as well as for moldable materials and furthermore lack intrinsic size limitations. Despite their attractiveness, only recently Pt-based BMGs have been successfully molded into pores ranging 10-100 nm (Kumar et al 2009 Nature 457 868-72). Here, we introduce a quantitative theory, which reveals previous challenges in filling nanosized pores. This theory considers, in addition to a viscous and a capillary term, also oxidation, which becomes increasingly more important on smaller length scales. Based on this theory we construct a nanomoulding processing map for BMG, which reveals the limiting factors for BMG nanomoulding. Based on the quantitative prediction of the processing map, we introduce a strategy to reduce the capillary effect through a wetting layer, which allows us to mold non-noble BMGs below 1 μm in air. An additional benefit of this strategy is that it drastically facilitates demoulding, one of the main challenges of nanomoulding in general.

References

Apr 15, 2005·Nature·Andreas LendleinRobert Langer
Aug 21, 2007·Nature Materials·H GuoE Ma
Mar 21, 2008·Nature Materials·Zhihong Nie, Eugenia Kumacheva
Feb 13, 2009·Nature·Golden KumarJan Schroers
Mar 11, 2010·Advanced Materials·Koji S NakayamaAkihisa Inoue
May 25, 2010·Advanced Materials·Jan Schroers
Oct 6, 2010·Advanced Materials·Golden KumarJan Schroers
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Sep 10, 2014·Nano Letters·X Wendy GuJulia R Greer

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Citations

Sep 11, 2016·Materials Science & Engineering. C, Materials for Biological Applications·Chunling QinAkihisa Inoue
Feb 23, 2017·Nanoscale·Molla Hasan, Golden Kumar
May 28, 2016·Scientific Reports·Yanhui LiuJan Schroers
Feb 9, 2019·Physical Review Letters·Ze LiuJan Schroers
Mar 25, 2017·Scientific Reports·Jitang Fan

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