Nanoporous Aerogel
Overview
Nanoporous aerogel is a synthetic porous material characterized by its ultra-low density and high surface area. Its nanostructured network, formed via sol-gel processes and supercritical drying, results in a solid matrix with up to 99.8% air content. Initially developed for aerospace applications, it now serves diverse industries due to its exceptional thermal insulation and lightweight properties. Common compositions include silica, carbon, and polymer-based aerogels, each tailored for specific performance metrics. Silica aerogels, the most widely used, exhibit transparency and hydrophobicity when chemically modified. The material’s versatility stems from tunable pore sizes (1–100 nm) and surface chemistry.
Physical and Chemical Properties
Nanoporous aerogels exhibit unique physical properties, including thermal conductivity as low as 0.013 W/m·K, outperforming traditional insulation materials like fiberglass. Their open-cell structure provides sound absorption coefficients of 0.8–1.2, making them effective for acoustic applications. Chemically, silica aerogels are inert to most solvents but may degrade in strong bases or hydrofluoric acid. Surface modifications, such as silylation, enhance water resistance. The material’s mechanical strength is limited (0.1–1 MPa compressive strength), requiring reinforcement (e.g., with fibers) for structural use.
Main Applications
In construction, aerogels are used as insulating panels for energy-efficient buildings, reducing heating/cooling costs by 20–40%. The aerospace industry employs them for cryogenic insulation in spacecraft and satellites due to their lightweight and vacuum compatibility. Other uses include oil spill remediation (hydrophobic aerogels absorb 40x their weight in oil), catalytic supports (high surface area), and Cherenkov radiation detectors. Emerging applications span wearable tech and battery separators, leveraging their porosity for ion transport.
Safety and Storage
While non-toxic, aerogel dust particles can cause respiratory irritation. Use NIOSH-approved masks and ensure proper ventilation during handling. Gloves are recommended to prevent skin dryness from silica exposure. Store aerogels in sealed containers to prevent moisture absorption, which can compromise structural integrity. Avoid stacking heavy items on bulk materials to prevent crushing. For hydrophobic variants, prolonged UV exposure may degrade surface treatments.
B2B Procurement Guide
When sourcing aerogels, prioritize suppliers with ISO 9001 certification to ensure consistent quality. Key specifications to request include pore size distribution (BET analysis reports), thermal conductivity (ASTM C518), and compressive strength data. For large-scale projects, negotiate bulk discounts; prices drop significantly for orders exceeding 100 kg. Lead times vary (2–8 weeks) due to specialized production processes. Consider regional logistics—aerogels’ fragility may require custom packaging for long-distance shipping.
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