Biomimetic, Hierarchical‐Porous Composite Aerogel Fiber with Spectral Selectivity and Water Microchannels for Synergistic Radiative‐Evaporative Passive Cooling Textile

Why It Matters

The technology offers a low‑energy, wearable solution for thermal comfort, reducing reliance on HVAC systems and opening new markets for high‑performance cooling apparel.

Key Takeaways

• Hierarchical porous aerogel fibers mimic desert animal hair
• Emissivity 96.1% and solar reflectivity 92.3% achieved
• Fabric stays ~10 °C cooler than cotton in sunlight
• Absorbs >80% sweat weight; evaporates 5.7 g/h
• Scalable wet‑spinning yields strong, breathable textile

Pulse Analysis

Passive cooling textiles have long sought to balance heat rejection with moisture management, yet most solutions rely on active systems or bulky materials. The newly reported structure‑engineered aerogel fibers (SAFs) address this gap by integrating hierarchical porosity with hollow glass microspheres, delivering a dual‑function platform that reflects solar radiation while radiating heat through the atmospheric window. This biomimetic approach mirrors the micro‑scale hair of desert fauna, achieving a rare combination of 96.1% emissivity and 92.3% solar reflectivity, which dramatically lowers the thermal load on the wearer.

Beyond spectral selectivity, SAFs excel in sweat handling. Their 93.9% internal porosity creates capillary pathways that instantly absorb more than 80% of their own weight in moisture and sustain an evaporation rate of roughly 5.7 g per hour. This evaporative component synergizes with radiative cooling, pulling additional heat away from the skin without external power. Mechanical testing confirms that the wet‑spinning process yields fibers with high tensile strength, water resistance, and breathability—critical attributes for everyday apparel and protective gear.

Commercial implications are significant. In direct sunlight, SAF fabrics recorded temperature reductions of 10.6 °C compared with conventional cotton, and up to 12 °C when sweat infiltration was simulated. Such performance translates to measurable energy savings for climate‑controlled environments and opens avenues for high‑performance sportswear, military uniforms, and outdoor work clothing. The scalable production method ensures cost‑effectiveness, positioning SAFs as a disruptive entrant in the growing market for sustainable, passive cooling solutions.