Ultra-Low Refractive Index at 1.27 – Unlock Superior Anti-Reflective Performance
Are you struggling with unwanted light reflection on photovoltaic glass, automotive windshields, architectural glazing, or electronic display films? Reflection not only reduces energy conversion efficiency in solar panels but also compromises visual clarity and user experience across countless optical applications. The solution lies in a low-refractive-index coating-and N-1127-40W is engineered to deliver exactly that.
N-1127-40W is a nanoscale hollow silica water solution featuring a unique hollow-sphere structure that achieves an exceptionally low refractive index of 1.27 (nD25) . This is significantly lower than conventional optical materials such as silica glass (1.50) and magnesium fluoride (1.38). The hollow interior of each nanoparticle-combined with the voids between particles-creates a porous architecture that effectively introduces air into the coating matrix, dramatically reducing the overall refractive index.
With a nanoparticle size of 40-50 nm, N-1127-40W forms coatings with excellent transparency (>95%) , making it ideal for applications where optical clarity is paramount. The nano-sized dispersion ensures uniform film formation without scattering visible light, preserving the pristine appearance of your substrates while delivering outstanding anti-reflective performance.
Key Features & Technical Advantages
Ultra-Low Refractive Index (1.27)
The hollow silica structure enables a refractive index far below that of traditional solid silica or MgF₂ coatings. This brings the coating close to the theoretical ideal of 1.23 for single-layer anti-reflective films on glass, effectively minimizing Fresnel reflection at the air-coating interface.
>95% Optical Transparency
The 40-50 nm particle size is well below the visible light wavelength, ensuring that the coating remains completely transparent with no haze or scattering. Your glass or film retains its original clarity while gaining anti-reflective functionality.
Excellent Compatibility with Water-Based Resin Systems
N-1127-40W demonstrates outstanding miscibility with various water-based resin systems, ensuring stable dispersion and consistent coating performance. The formulation maintains long-term storage stability, giving you reliable results batch after batch.
Superior Physical, Optical, and Chemical Properties
As a silica-based material, N-1127-40W delivers the full benefits of silicon dioxide-chemical stability, corrosion resistance, heat resistance, and mechanical durability-combined with the unique advantages of its hollow nanostructure.
Versatile Application Methods
The water-based dispersion can be applied through multiple coating techniques including spray coating, spin coating, dip coating, inkjet, and gravure coating, offering flexibility to integrate into your existing manufacturing processes.
Applications
N-1127-40W serves as a high-performance nano-coating additive across multiple industries:
Photovoltaic Glass
Increase solar transmittance and boost energy conversion efficiency by applying an anti-reflective coating to PV module glass. The low refractive index coating reduces surface reflection, allowing more sunlight to reach the photovoltaic cells.
Automotive Glass
Reduce windshield glare to improve driving safety and visual comfort. The anti-reflective coating minimizes distracting reflections while maintaining excellent transparency.
Architectural & Building Glass
Enhance the aesthetic and functional performance of display windows, curtain walls, and glass facades by reducing unwanted reflections and improving light transmission.
Optical Films & Electronic Displays
Apply to touch panels, LCD and OLED display films, and cover glass to reduce surface reflections, improve contrast, and enhance screen readability in bright environments.
Functional Substrates & Specialty Coatings
Ideal for anti-reflective coatings on plastic substrates, optical lenses, and other transparent materials requiring low refractive index layers.
Technical Specifications
| Parameter | Specification |
|---|---|
| Appearance | Translucent liquid |
| Nanosilica Content (wt%) | 20% |
| Viscosity at 25°C (mPa·s) | 100-300 |
| pH Value | 8-9 |
| Refractive Index (nD25) | 1.27 |
| Relative Density | 0.85-0.95 |
| Nanoparticle Size | 40-50 nm |
Why Choose Hollow Silica Nanoparticles?
Conventional low-refractive-index materials like magnesium fluoride (1.38) still generate approximately 1.4% reflection. Hollow silica nanoparticles overcome this limitation by introducing a core-shell structure-a solid silica shell surrounding an air-filled cavity. This unique architecture, combined with inter-particle voids, creates a coating with a refractive index that can be fine-tuned to approach the ideal anti-reflective value.
Research has demonstrated that hollow silica nanoparticle-based coatings can achieve reflectance as low as 0.92% at 550 nm wavelength, equivalent to a refractive index of 1.23. The nano-sized inorganic-organic hybrid films exhibit optical properties and structural integrity that cannot be achieved by either component alone.
Usage & Handling
N-1127-40W is supplied as a ready-to-use water dispersion. For optimal results:
Dilute or formulate according to your specific coating system requirements
Compatible with most water-based resin systems
Store at ambient temperature in sealed containers
Avoid freezing and prolonged exposure to direct sunlight
Shake well before use to ensure uniform dispersion
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