Gradient all-nanostructured aerogel fibers for enhanced thermal insulation and mechanical properties.

 0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Qichun Feng, Xiaotong Fu, Lianmeng Si, Jianwei Song, Tingting Yang, Dongdong Ye, Zhaoxin Zhang, Shuze Zhu

Ngôn ngữ: eng

Ký hiệu phân loại: 782.28 *Carols

Thông tin xuất bản: England : Nature communications , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 686184

Lightweight, nanoporous aerogel fibers are crucial for personal thermal management and specialized heat protection. However, wet-spinning methods, exemplified by aramid aerogels, inevitably form a dense outer layer, significantly reducing the volume fraction of efficient thermal barrier nanovoids and limiting the development of ultimate thermal resistance in fibers. Herein, we develop a microfluidic spinning method to prepare gradient all-nanostructure aramid aerogel fibers (GAFs). Benefiting from the simultaneous shear alignment and diffusion dilution of a good solvent within the channels, the precursor gel fibers assemble into a structure with a sparse exterior and dense interior, which reverses during supercritical drying to form sheath and core layers with average pore diameters of 150 nm and 600 nm, respectively. Experiments and simulations reveal that the gradient nanostructure creates high interfacial thermal resistance at heat transfer interfaces, resulting in a radial thermal conductivity as low as 0.0228 W m
Tạo bộ sưu tập với mã QR

THƯ VIỆN - TRƯỜNG ĐẠI HỌC CÔNG NGHỆ TP.HCM

ĐT: (028) 36225755 | Email: tt.thuvien@hutech.edu.vn

Copyright @2024 THƯ VIỆN HUTECH