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Lightweight Hexagonal Boron Nitride Foam for CO2 Absorption

zhpd55 添加于 2017/8/17 17:37:01  1456次阅读 | 0次推荐 | 0个评论

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 absorption and as laser irradiation protection material.

作 者: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.
期刊名称: ACS Nano
期卷页: Publication Date (Web): August 3, 2017 第卷 第期 页
学科领域:化学科学 » 无机化学 » 应用无机化学
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原文链接:http://pubs.acs.org/doi/abs/10.1021/acsnano.7b03291
DOI: 10.1021/acsnano.7b03291
ISBN:
关键词: CO2 absorption; h-BN; MD simulation; PVA; three-dimensional materials
全文地址: 下载
备 注: Rice University materials scientists have created a light foam from two-dimensional sheets of hexagonal-boron nitride (h-BN) that absorbs carbon dioxide. They discovered freeze-drying h-BN turned it into a macro-scale foam that disintegrates in liquids. But adding a bit of polyvinyl alcohol (PVA) into the mix transformed it into a far more robust and useful material. The foam is highly porous and its properties can be tuned for use in air filters and as gas absorption materials, according to researchers in the Rice lab of materials scientist Pulickel Ajayan. Their work appears in the American Chemical Society journal ACS Nano.
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