Lightweight Hexagonal Boron Nitride Foam for CO2 Absorption

Autor(es):Mostrar menos -

Owuor, Peter Samora ^[1] ; Park, Ok-Kyung ^{[1, 2]} ; Woellner, Cristiano F. ^{[1, 3]} ; Jalilov, Almaz S. ^[4] ; Susarla, Sandhya ^[1] ; Joyner, Jarin ^[1] ; Ozden, Sehmus ^[5] ; Duy, LuongXuan ^[4] ; Salvatierra, Rodrigo Villegas ^[4] ; Vajtai, Robert ^[1] ; Tour, James M. ^[4] ; Lou, Jun ^[1] ; Galvao, Douglas Soares ^[3] ; Tiwary, Chandra Sekhar ^[1] ; Ajayan, Pulickel M. ^[1]

Afiliação do(s) autor(es)

^[1] Rice Univ, Dept Mat Sci & NanoEngn, Houston, TX 77005 - USA

^[2] Chonbuk Natl Univ, Dept BIN Fus Technol, 567 Baekje Dero, Jeonju - South Korea

^[3] State Univ Campinas UNICAMP, Appl Phys Dept, BR-13083859 Campinas, SP - Brazil

^[4] Rice Univ, Dept Chem, POB 1892, Houston, TX 77005 - USA

^[5] Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 - USA

• Tipo de documento: Artigo Científico
• Fonte: ACS NANO; v. 11, n. 9, p. 8944-8952, SEP 2017.
• Citações Web of Science: 17

Resumo

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. (AU)

• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 16/12340-9 - Propriedades Estruturais e Mecânicas de Espumas Baseadas no Carbono
• Beneficiário: Cristiano Francisco Woellner
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado