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Type: Artigo
Title: Lightweight hexagonal boron nitride foam for CO2 absorption
Author: Owuor, P. S.
Park, O.-K.
Woellner, C. F.
Jalilov, A. S.
Susarla, S.
Joyner, J.
Ozden, S.
Duy, L. X.
Salvatierra, R. V.
Vajtai, R.
Tour, J. M.
Lou, J.
Galvão, D. S.
Tiwary, C. S.
Ajayan, P. M.
Abstract: 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 CO, absorption and as laser irradiation protection material.
Subject: Nitreto de boro hexagonal
Dióxido de carbono
Dinâmica molecular - Simulação por computador
Poli (álcool vinílico)
Hexagonal boron nitride
Carbon dioxide
Molecular dynamics - Computer simulation
Polyvinyl alcohol
Country: Estados Unidos
Editor: American Chemical Society
Rights: fechado
Identifier DOI: 10.1021/acsnano.7b03291
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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