Román-Manso Benito, Muth Joseph, Gibson Lorna J, Ruettinger Wolfgang, Lewis Jennifer A
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.
Materials Science and Engineering Department, MIT, Cambridge, Massachusetts 02139, United States.
ACS Appl Mater Interfaces. 2021 Feb 24;13(7):8976-8984. doi: 10.1021/acsami.0c22292. Epub 2021 Feb 12.
Hierarchically porous ceramics with a high specific surface area and interconnected porosity may find potential application as particulate filters, catalyst supports, and battery electrodes. We report the design and programmable assembly of cellular ceramic architectures with controlled pore size, volume, and interconnectivity across multiple length scales via direct foam writing. Specifically, binary colloidal gel foams are created that contain entrained bubbles stabilized by the irreversible adsorption of attractive alumina and carbon (porogen) particles at their air-water interfaces. Composition effects on foam ink rheology and printing behavior are investigated. Sintered ceramic foams exhibited specific permeabilities that increased from 2 × 10 to 1 × 10 m and compressive strengths that decreased from 40 to 1 MPa, respectively, with increasing specific interfacial area. Using direct foam writing, 3D ceramic lattices composed of open-cell foam struts were fabricated with tailored mechanical properties and interconnected porosity across multiple length scales.
具有高比表面积和相互连通孔隙率的分级多孔陶瓷可能会在颗粒过滤器、催化剂载体和电池电极等方面找到潜在应用。我们报告了通过直接泡沫书写法，设计并可编程组装出具有可控孔径、孔隙体积和跨多长度尺度连通性的蜂窝陶瓷结构。具体而言，制备了二元胶体凝胶泡沫，其中包含通过在气-水界面不可逆吸附有吸引力的氧化铝和碳（致孔剂）颗粒而稳定的夹带气泡。研究了组成对泡沫油墨流变学和打印行为的影响。烧结陶瓷泡沫的比渗透率分别从2×10增加到1×10 m，抗压强度从40 MPa降低到1 MPa，且随着比界面面积的增加而变化。利用直接泡沫书写法，制造出了由开孔泡沫支柱组成的三维陶瓷晶格，其具有定制的机械性能和跨多长度尺度的相互连通孔隙率。
