单向冰晶模板法制备有序高稳定性介孔PVA气凝胶
Polyvinyl alcohol aerogels with ordered and highly stable mesopores via unidirectional ice-template method
梁博 1王锦涛 2薛敏1
作者信息
- 1. 北方民族大学材料科学与工程学院,宁夏 银川 750021
- 2. 安康学院化工学院,陕西 安康 725000;武汉工程大学重庆研究院,重庆 401220
- 折叠
摘要
聚乙烯醇(PVA)气凝胶由于质轻、多孔的特点被广泛应用于各个领域.孔隙结构对其性能起着决定性的作用,但可控地制备具有可调结构的PVA气凝胶仍然是一个挑战.本文报道了一种通过冰诱导自组装制备具有可设计孔隙结构的PVA气凝胶的简便方法.通过简单地调整温度梯度、预冻方向和溶质浓度等因素,研究了其性质与结构之间的关系.所制备的气凝胶具有典型的介孔材料(2～25nm)特征和较好的柔韧性.疏水改性后的气凝胶从完全亲水变为表面疏水,水接触角达到117°,其对三氯甲烷的吸收能力达到20g/g.该研究为PVA基气凝胶的可控制备和油水分离应用提供了新的思路.
Abstract
Polyvinyl alcohol(PVA)aerogels are widely used in various fields due to the lightweight and porous features.The pore structure plays a decisive role in the performances,but controllable fabrication of PVA aerogel with a tunable structure is still a challenge.Herein,a facile approach to prepare PVA aerogel with a designable pore structure by ice-induced self-assembly was reported.The relationship between the properties and structure was investigated by simply tuning factors such as temperature gradient,pre-freezing direction and solute concentration.The as-prepared aerogel had typical mesoporous(2-25nm)material characteristics and good flexibility.After hydrophobic modification,the PVA aerogels were changed from completely hydrophilic to surface hydrophobic,and the water contact angle and the absorption capacity of trichloromethane reached 117° and 20g/g,respectively.The research provided new insight into the controllable preparation and oil-water separation application of PVA-based aerogels.
关键词
聚乙烯醇气凝胶/介孔/可控结构/冰晶模板/油水分离Key words
polyvinyl alcohol aerogel/mesopores/controllable structure/ice-template/oil-water separation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据