期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 166, 期 -, 页码 1499-1507出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.11.029
关键词
Pore size distribution; Pore microstructure; Filtration efficiency
资金
- National Natural Science Foundation of China [31901655, 31671827]
- technology support program of Hubei Science and Technology Department [2016ACA164]
The pore size distribution of konjac glucomannan (KGM)-based aerogels plays a key role in air filtration efficiency and resistance. Increasing the total solid concentration leads to smaller pore size and decreased porosity in the aerogels. By preparing aerogel stacks with different pore size distributions, filtration efficiency can be improved while reducing air resistance.
The pore size distribution of konjac glucomannan (KGM)-based aerogels seriously impacted the air filtration efficiency and filtration resistance. This study aimed to investigate the pore size distribution control of KGM-based aerogels through total solid concentration of the sol and to improve the filtration performance by preparing aerogel stacks, which were made by combining KGM-based aerogels with different pore size distribution (range: 0-180 mu m). Results indicated that with increased total solid concentration from 50% to 100% of the origin formulae, aerogel pore size became smaller and the porosity was decreased for all the three sample formulae. Meanwhile, the aerogel mechanical property and filtration efficiency were both strengthened with increased total solid concentration, but the air resistance became significantly higher. The changing extent and rule were influenced by the sample components (KGM, starch, gelatin, wheat straw). The aerogel stacks prepared by in series combining the aerogel pieces with different pore size distribution (from large size to small size) was found to improve filtration efficiency (e.g. from 70% to 80% for K1G2S4WS2) and significantly lower the air resistance (e.g. from 270 Pa to 190 Pa for K1G2S4WS2). This study could guide the filtration performance improvement of aerogels. (C) 2020 Elsevier B.V. All rights reserved.
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