NM-1345 is a fluorine‑free, low‑refractive‑index UV nano‑sol developed for high‑end optical coating applications. By coupling multifunctional acrylates with specially structured hollow‑shell silica nanoparticles, this product achieves an exceptionally low refractive index of 1.345 while maintaining outstanding optical transparency and minimal haze.
Conventional solid silica materials typically have a refractive index around 1.46, which limits their performance in demanding optical films. NM‑1345 overcomes this barrier through its hollow‑particle architecture – each 50 nm particle encloses an internal air cavity (refractive index ≈ 1.0), effectively lowering the overall effective index of the cured film. This innovation makes it an ideal choice for anti‑reflective coatings, optical enhancement films, fibre optic cladding, and various display‑grade nano‑coatings.
Compared to traditional fluorine‑containing low‑index materials, NM‑1345 not only delivers a superior refractive index but also inherits the high hardness, abrasion resistance, and excellent thermal/weather stability inherent to inorganic silica – all without the environmental and cost concerns associated with fluorinated compounds.
Core Technology: Hollow‑Shell Silica Nanoparticles
The key to NM‑1345's performance lies in its hollow‑shell silica nanoparticle design. Unlike solid particles, each hollow nanoparticle contains a sealed internal void filled with air (n ≈ 1.0). This unique structure dramatically reduces the effective refractive index of the cured matrix.
The particle size is approximately 50 nm, which is far smaller than the wavelength of visible light (380–780 nm). As a result, Rayleigh scattering is negligible, ensuring ultra‑high transparency and extremely low haze – essential for precision optical display materials where visual clarity is paramount.
Key Specifications
| Property | Typical Value |
|---|---|
| Appearance | Translucent liquid |
| Nanosilica content (wt%) | 60 |
| Viscosity at 25 °C (mPa·s) | 2,000 – 3,000 |
| Effective content | 100% |
| Refractive index (nD²⁵) | 1.345 |
| Relative density | 1.05 – 1.15 |
| Nanoparticle size | 50 nm |
NM‑1345 offers low viscosity and excellent processability, making it easy to apply via various coating techniques (slot‑die, gravure, spin‑coating, etc.). Its fast UV‑curing capability boosts production efficiency, especially in roll‑to‑roll continuous coating processes.
Applications
1. UV Coatings & Optical Film Nano‑Coatings
NM‑1345 is an ideal building block for low‑index layers, anti‑reflective (AR) coatings, and transparency‑enhancing films. When used as the low‑index layer in multilayer interference stacks, it significantly reduces surface reflection and boosts overall light transmission.
We recommend combining NM‑1345 with low‑functionality acrylates to lower curing shrinkage and improve toughness and adhesion.
2. Fibre Optic Cladding
For plastic optical fibres (POF) and specialty silica fibres, the cladding material must have a lower refractive index than the core. With nD²⁵ = 1.345, NM‑1345 provides excellent light confinement and reduces bend‑induced signal loss.
3. Optical Bonding & Index Matching
Fresnel reflections at interfaces between different optical materials can cause significant losses. Adding NM‑1345 to coupling adhesives or encapsulation resins allows precise index tuning to minimise interfacial reflections. Its inorganic silica nature also ensures long‑term physicochemical stability.
Formulation Compatibility
NM‑1345 demonstrates outstanding compatibility with a wide range of coating systems:
Monomers: Miscible with all common acrylate monomers.
Solvents: Compatible with esters, ketones, and aromatic hydrocarbons.
Polymers: Excellent miscibility with polyesters, epoxies, polyurethanes, phosphates, and acrylate resins – enabling flexible formulation adjustment to meet diverse performance requirements.
This broad compatibility allows NM‑1345 to be seamlessly integrated into existing UV‑curable or thermally cured systems, ensuring stable dispersion and reliable film formation.
Summary
With its hollow‑shell silica architecture, ultra‑low refractive index of 1.345, high transparency and low haze, fast UV curing, and excellent hardness and scratch resistance, NM‑1345 is the material of choice for advanced optical coatings, anti‑reflective films, fibre cladding, and optical bonding applications.
Whether you are developing next‑generation AR films, improving display optics, or optimising fibre‑optic signal transmission, NM‑1345 offers a reliable, high‑performance solution – all without the drawbacks of fluorinated chemistry.
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