Thick Transparent Nanoparticle-Based Mesoporous Silica Monolithic Slabs for Thermally Insulating Window Materials
Thick Transparent Nanoparticle-Based Mesoporous Silica Monolithic Slabs for Thermally Insulating Window Materials
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DOI：
10.1021/acsanm.9b00903
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发表时间：
2019-07-01
影响因子：
5.9
通讯作者：
Pilon, Laurent
中科院分区：
文献类型：
--
作者：
Marszewski, Michal;King, Sophia C.;Pilon, Laurent
本文提出了一种新型无模板水基溶胶凝胶方法，通过在环境条件下凝胶化和干燥二氧化硅纳米粒子的胶体悬浮液来合成厚的透明隔热介孔二氧化硅整体板。首次在全氟化碳液体基材上合成介孔二氧化硅板，以减少粘附力并使凝胶在老化和干燥过程中自由收缩，而不会产生可能导致断裂的显着应力。独立式纳米颗粒基介孔二氧化硅板呈圆盘状或方形，厚度在1至6毫米之间，孔隙率约为50%。由于纳米颗粒较小（6-12 nm）和孔径（
This paper presents a novel template-free water-based sol gel method to synthesize thick transparent and thermally insulating mesoporous silica monolithic slabs by gelation and drying of a colloidal suspension of silica nanoparticles under ambient conditions. For the first time, mesoporous silica slabs were synthesized on perfluorocarbon liquid substrates to reduce adhesion and enable the gels to shrink freely during aging and drying without incurring significant stress that could cause fracture. The free-standing nanoparticle-based mesoporous silica slabs were disks or squares, with thickness between 1 and 6 mm and porosity around 50%. The slabs had high transmittance and low haze in the visible spectrum due to small nanoparticles (6-12 nm) and pore size (