Overview
Nano Titanium Dioxide (TiO2) is a highly versatile inorganic compound with particle sizes typically ranging from 1 to 100 nanometers. Due to its nanoscale dimensions, it exhibits unique optical, catalytic, and mechanical properties not found in its bulk counterpart. It is widely used across industries for its exceptional whiteness, UV resistance, and photocatalytic capabilities. The production of nano TiO2 involves advanced techniques such as vapor-phase hydrolysis or sol-gel processes, ensuring precise control over particle size and crystallinity. Its two primary crystalline forms, anatase and rutile, each offer distinct advantages for specific applications.
Physical and Chemical Properties
Nano TiO2 possesses a high refractive index (2.4-2.9), making it an excellent opacifier and brightening agent. Its photocatalytic activity under UV light enables the decomposition of organic pollutants, a property harnessed in self-cleaning surfaces and air purification systems. The material's bandgap energy (3.0-3.2 eV) determines its UV absorption characteristics. Surface modification through silane or alumina coatings is commonly employed to improve dispersion in various matrices. The nanoparticles exhibit quantum size effects, showing enhanced reactivity compared to conventional TiO2. Their stability under high temperatures and chemical inertness contribute to long-term performance in demanding applications.
Main Applications
In coatings and paints, nano TiO2 provides superior opacity, durability, and UV protection, significantly extending product lifespan. The plastics industry utilizes it for whitening and UV stabilization, particularly in outdoor applications like automotive parts and construction materials. Cosmetic formulations benefit from its UV-blocking properties while maintaining transparency in sunscreens. Environmental applications include photocatalytic water and air purification systems, where it breaks down pollutants under light exposure. Emerging uses span from antimicrobial coatings for medical devices to photovoltaic cells in solar energy technologies. The food packaging industry employs nano TiO2 for its oxygen scavenging and antimicrobial properties.
Safety and Storage
While generally considered safe, nano TiO2 requires careful handling due to potential respiratory hazards from airborne particles. Workplace exposure limits should follow regional regulations (typically 0.3-10 mg/m³ for respirable dust). Proper ventilation and personal protective equipment (PPE) including N95 masks are recommended during processing. Storage should maintain product integrity by preventing moisture absorption and particle agglomeration. Original packaging with moisture barriers is ideal, kept in cool (15-25°C), dry conditions away from incompatible substances. Bulk quantities require explosion-proof facilities due to dust explosion risks.
B2B Procurement Guide
Industrial buyers should specify key parameters: crystalline phase (anatase/rutile/mixed), primary particle size (10-50nm typical), surface area (20-200 m²/g), and surface treatment (hydrophilic/hydrophobic). Certification for food contact (FDA, EU) or cosmetic use may be required depending on application. Supplier evaluation should consider production capacity, batch consistency, and technical support capabilities. Sample testing for dispersion stability and performance in the final application is crucial. Large-volume purchasers can negotiate pricing based on annual contracts, with typical MOQs starting at 500kg for specialized grades.
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