Overview
Yttrium oxide sol is a stable colloidal dispersion of nano-sized yttrium oxide (Y2O3) particles in aqueous or organic media. It combines the properties of yttria—high thermal stability and optical performance—with the processability of a liquid. The sol is typically stabilized by surfactants or electrostatic repulsion to prevent particle aggregation. This material bridges the gap between solid ceramics and liquid processing methods, enabling applications like thin film deposition and precision coating. Industrial-grade sols usually contain 5-20% Y2O3 by weight, with particle sizes ranging from 10-100 nm.
Physical and Chemical Properties
The sol exhibits Tyndall scattering, appearing translucent due to light interaction with nanoparticles. Its viscosity resembles water (1-5 cP) but increases with particle concentration. When dried, it forms a transparent yttria film with a refractive index of ~1.9, melting point of 2410°C, and Mohs hardness of 6.8. Chemically, yttria particles are inert to most solvents but may aggregate at extreme pH. The sol's stability depends on the zeta potential, typically maintained at ±30 mV. Some formulations include acetic acid or ammonium hydroxide as stabilizers, affecting compatibility with downstream processes.
Main Applications
In optics, the sol spin-coats onto lenses to create anti-reflective or UV-blocking layers. The electronics industry uses it for YIG (yttrium iron garnet) thin films in microwave devices. Transparent yttria ceramics made from sol-gel processes serve as laser host materials and thermal barrier coatings. Other uses include: catalyst supports for petrochemical reactions, sintering aids for advanced ceramics, and precursors for superconducting materials (e.g., YBCO). Recent R&D explores its role in quantum dot encapsulation and radiation-resistant coatings.
Safety and Storage
As a liquid product, the sol presents minimal inhalation risk but may irritate skin upon prolonged contact. Use nitrile gloves and goggles when handling. Unlike powder yttria, it doesn't pose dust explosion hazards. Store in original containers at 5-30°C. Avoid temperature cycles that cause condensation. Shelf life is typically 6-12 months; shaking redisperses any settled particles. Dispose of waste per local regulations for heavy metal-containing liquids—most jurisdictions classify yttrium as low-toxicity.
B2B Procurement Guide
Key specifications to request: particle size distribution (D50/D90), solid content (wt%), pH value, and stabilizer type. For coating applications, verify the sol's wetting angle on substrate materials. Batch-to-batch consistency is critical—ask for ICP-MS purity data (typically >99.9% Y2O3 basis). Suppliers may offer customized formulations with ethanol/water mixtures for faster drying. Bulk shipments (200L drums) often cost 15-30% less per kg than lab-scale quantities. Consider on-site filtration for sub-20nm particle requirements. MOQs range from 1kg for R&D to 100kg for production.
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