Toughening of nanoporous glasses using porogen residuals

Nature Materials
Daniel A MaidenbergReinhold H Dauskardt

Abstract

Nanoporous glasses are inherently brittle materials that become increasingly fragile with increasing porosity. We show that remarkable increases in fracture energy can be obtained from remnants of the porogen molecules used to create the nanoscale pores. The interfacial fracture energy of approximately 2.6 J m(-2) for dense methylsilsesquioxane glass films is shown to increase by over one order of magnitude to >30 J m(-2) for glasses containing 50 vol.% porosity. The increased fracture resistance is related to a powerful molecular-bridging mechanism that was modelled using bridging mechanics. The study demonstrates that significant increases in interfacial fracture energy may be obtained using strategies involving controlled decomposition of the porogen molecule during processing of nanoporous glasses. The implications are important for a range of emerging optical, electronic and biological technologies that use nanoporous thin films, but are limited by the degradation of mechanical properties with increasing porosity.

References

Mar 12, 1999·Science·M GrandboisH E Gaub
Dec 13, 2001·Chemical Reviews·M KamigaitoM Sawamoto

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Citations

Apr 17, 2012·ACS Applied Materials & Interfaces·Y MatsudaG Dubois
Nov 28, 2012·ACS Applied Materials & Interfaces·Linying CuiReinhold H Dauskardt
Dec 25, 2015·ACS Applied Materials & Interfaces·Linying CuiReinhold H Dauskardt
Jul 23, 2015·ACS Applied Materials & Interfaces·Yasuhisa KayabaKazuo Kohmura
May 30, 2013·Nature Communications·Qilei SongEasan Sivaniah
May 18, 2007·Nature·Darshan D GandhiGanapathiraman Ramanath
Dec 8, 2009·Chemical Reviews·Willi VolksenGeraud Dubois
May 19, 2009·Nano Letters·Taek-Soo KimReinhold H Dauskardt
Aug 4, 2018·ACS Applied Materials & Interfaces·Scott G IsaacsonGeraud Dubois
Oct 11, 2017·Nano Letters·Scott G IsaacsonReinhold H Dauskardt

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