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Lightweight Hexagonal Boron Nitride Foam for CO2 Absorption

Weak van der Waals forces between inert hexagonal boron nitride (h-BN) nanosheets make it easy for them to slide over each other, resulting in an unstable structure in macroscopic dimensions. Creating interconnections between these inert nanosheets can remarkably enhance their mechanical properties. However, controlled design of such interconnections remains a fundamental problem for many applications of h-BN foams. In this work, a scalable in situ freeze-drying synthesis of low-density, lightweight 3D macroscopic structures made of h-BN nanosheets chemically connected by poly(vinyl alcohol) (PVA) molecules via chemical cross-link is demonstrated. Unlike pristine h-BN foam which disintegrates upon handling after freeze-drying, h-BN/PVA foams exhibit stable mechanical integrity in addition to high porosity and large surface area. Fully atomistic simulations are used to understand the interactions between h-BN nanosheets and PVA molecules. In addition, the h-BN/PVA foam is investigated as a possible CO2 abs...

Authors:   Peter Samora Owuor; Ok-Kyung Park; Cristiano F. Woellner; Almaz S. Jalilov; Sandhya Susarla; Jarin Joyner; Sehmus Ozden; LuongXuan Duy; Rodrigo Villegas Salvatierra; Robert Vajtai; James M. Tour; Jun Lou; Douglas Soares Galvão; Chandra Sekhar Tiwary; Pulickel M. Ajayan
Journal:   ACS Nano
Year:   2017
DOI:   10.1021/acsnano.7b03291
Publication date:   11-Aug-2017
Facts, background information, dossiers
  • nanosheets
  • molecules
  • hexagonal boron nitride
More about American Chemical Society Publications
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