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- W2960688093 abstract "The manipulation of nanobuilding blocks into a 3D macroscopic monolith with ordered hierarchical structures has been much desired for broad and large-scale practical applications of nanoarchitectures. In this paper, we demonstrate a fully bottom-up strategy for the preparation of aramid aerogel monoliths. The process starts from the synthesis of poly(p-phenylene terephthalamide) (PPTA) through the polycondensation of p-phenylenediamine and terephthaloyl chloride, with the assistance of a nonreactive dispersing agent (polyethylene glycol dimethyl ether), which helps the dispersal of the as-synthesized PPTA in an aqueous medium for the formation of p-aramid nanofibers (ANF). Then the vacuum-assisted self-assembly (Vas) technique is skillfully connected with the ice-templated directional solidification (I) technique, and the combined VasI method successfully tailors the self-assembly of ANF to transform the 1D nanofibers into a 3D aerogel monolith with a specific long-range aligned, lasagna-like, multilaminated internal structure. The study of the aerogel microstructure revealed the dependence of the lamina orientation on the direction of the freezing front of ice crystals. This direction should be parallel to the deposition plane of the Vas process if a long-range aligned lamellar structure is desired. The anisotropy of the multilaminated aerogel was proven by the different results in the radial and axial directions in the compression and thermal conductivity tests. As a kind of organic aerogel, the ANF monolith has typical low density, high porosity, and low thermal conductivity. Additionally, the ANF monolith exhibits high compressive stress and excellent thermal stability. Considering its high performance and facile preparation process, potential applications of the ANF aerogel monolith can be expected." @default.
- W2960688093 created "2019-07-23" @default.
- W2960688093 creator A5024990016 @default.
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- W2960688093 date "2019-07-09" @default.
- W2960688093 modified "2023-10-12" @default.
- W2960688093 title "From Monomers to a Lasagna-like Aerogel Monolith: An Assembling Strategy for Aramid Nanofibers" @default.
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- W2960688093 doi "https://doi.org/10.1021/acsnano.9b01955" @default.
- W2960688093 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31287660" @default.
- W2960688093 hasPublicationYear "2019" @default.
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