Gradient Aerogel Fibers: How a “Fluffy-Core, Fine-Skin” Design Crushes Heat and Stays Tough
A new class of gradient all-nanostructured aramid aerogel fibers (GAFs) delivers thermal insulation that beats air while staying light and tough. By engineering a radial pore gradient—fine pores outside (~150 nm), larger pores inside (~600 nm)—the fibers create interfacial thermal resistance that slows heat flow, dropping radial thermal conductivity to 0.0228 W·m⁻¹·K⁻¹. Unlike wet-spun fibers that form a stiff, failure-prone skin, GAFs weave a nano-entangled network that spreads stress, reaching ~29.5 MPa strength and ~39.2% strain. A microfluidic spinning process, followed by supercritical drying, lets researchers tune gradient thickness and pore structure on demand. The result is a scalable, fabric-ready fiber for personal thermal management, firefighting gear, EVs, and aerospace—anywhere you need thin, flexible, high-performance insulation. In short: the gradient turns heat into a maze and keeps the fiber unflappable under load.
