High-Precision Silica Sol
Overview
High-Precision Silica Sol is an aqueous colloidal dispersion of amorphous silicon dioxide (SiO₂) nanoparticles, typically stabilized with sodium or ammonium ions. Unlike conventional silica sols, high-precision grades feature tightly controlled particle size distributions (often <20% variation) and ultra-low metallic impurities (<10 ppm). This material is produced through peptization of sodium silicate or hydrolysis of silicon alkoxides, followed by advanced purification processes like ultrafiltration. Its monodisperse nanoparticles enable uniform film formation and precise pore structures, making it indispensable in high-tech industries.
Physical and Chemical Properties
The sol exhibits Newtonian fluid behavior with viscosities ranging 5-50 cP (depending on concentration) and surface tensions of 50-70 mN/m. Its refractive index (1.34-1.45) and specific gravity (1.1-1.3) correlate linearly with SiO₂ content. Key chemical attributes include alkaline stability (pH 8-10.5), high surface area (50-500 m²/g), and negative zeta potential (-30 to -50 mV) ensuring colloidal stability. Particle morphology is typically spherical with smooth surfaces, confirmed by TEM analysis. Thermal treatment converts the amorphous structure to crystalline silica at ~1200°C.
Main Applications
In investment casting, it serves as a primary binder for ceramic shells, providing green strength and reduced metal penetration. Electronics manufacturers use it for CMP slurries (semiconductor planarization) and as a dielectric coating in MEMS devices. The coatings industry leverages its anti-reflective properties in solar panels and scratch-resistant films. Emerging applications include 3D printing of ceramics and as a template for mesoporous materials synthesis. Its biocompatibility also enables pharmaceutical uses as a drug delivery carrier.
Safety and Storage
While classified as non-hazardous under GHS, prolonged skin contact may cause dryness due to moisture absorption. Splashes in eyes require immediate flushing with water for 15 minutes. Spills create slippery surfaces and should be absorbed with inert materials. Storage tanks should be polyethylene or stainless steel (316L grade) to prevent metal contamination. Shelf life is typically 12 months when stored below 30°C; freezing causes irreversible gelation. Transport requires UN non-regulated classification for concentrations <50% SiO₂.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001-certified nanoparticle production facilities. Technical datasheets must specify: SiO₂ content (±1%), particle size distribution (D50 ±5 nm), viscosity (±5%), and ionic impurity levels (Na⁺ <500 ppm, Cl⁻ <100 ppm). For large-volume purchases (>1 ton/month), request third-party ICP-MS analysis certificates. Consider regional logistics - coastal plants often offer better rates for export markets. Sample testing should evaluate drying rate (target: 1-3 μm/min at 25°C) and sintered residue purity (>99.9% SiO₂).
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