期刊
SMALL
卷 15, 期 14, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201805363
关键词
anisotropic aerogels; carbon nanotube; cellulose nanofiber; strain sensors; unidirectional freeze drying
类别
资金
- National Natural Science Foundation of China [U1601206, 51525204]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2017B030306006]
- Guangdong Special Support Program [2017TQ04C664]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
- Shenzhen Basic Research Project [JCYJ20170412171359175]
Aerogels are one of the most popular composite reinforcement materials because of their high porosity and their continuous and homogeneous network. Most aerogels are isotropic, thus leading to isotropic composites when they are used as fillers. This fundamentally limits their applications in areas where anisotropy is needed. Here, an anisotropic microhoneycomb cellulose nanofiber- (CellF)-carbon nanotube (CNT) aerogel (denoted MCCA) is reported that contains unidirectionally aligned penetrating microchannels, which is prepared by a unidirectional freeze-drying method, using the structure-directing function of the CellFs. Due to its anisotropic nature, MCCA-reinforced polydimethylsilexane (denoted MCCA/PDMS) shows distinct anisotropic behavior, with the electrical conductivity and Young's modulus along the direction of penetrating microchannels being approximately twice those in the orthogonal direction. MCCA/PDMS is used to make directional strain sensors with electrical resistance as the output signal. They demonstrate a 92% sensitivity difference between the microchannel direction and its orthogonal direction. This approach can be used to prepare anisotropic MCCA-based composites with other polymers for different applications.
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