期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 39, 页码 11744-11748出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201703766
关键词
aramid nanofibers; branching; gels; mechanical properties; three-dimensional networks
资金
- Center for Solar and Thermal Energy Conversion, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000957]
- NSF [ECS-0601345, EFRI-BSBA 0938019, CBET 0933384, CBET 0932823, CBET 1036672, DMR-9871177, DMR-0315633]
- AFOSR [MURI 444286-P061716]
- NIH [1R21CA121841-01A2]
- National Natural Science Foundation of China [21571041]
Interconnectivity of components in three-dimensional networks (3DNs) is essential for stress transfer in hydrogels, aerogels, and composites. Entanglement of nanoscale components in the network relies on weak short-range intermolecular interactions. The intrinsic stiffness and rod-like geometry of nanoscale components limit the cohesive energy of the physical crosslinks in 3DN materials. Nature realizes networked gels differently using components with extensive branching. Branched aramid nanofibers (BANFs) mimicking polymeric components of biological gels were synthesized to produce 3DNs with high efficiency stress transfer. Individual BANFs are flexible, with the number of branches controlled by base strength in the hydrolysis process. The extensive connectivity of the BANFs allows them to form hydro-and aerogel monoliths with an order of magnitude less solid content than rod-like nanocomponents. Branching of nanofibers also leads to improved mechanics of gels and nanocomposites.
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