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Nano silica

Nano silica

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Nano-silica Material Details

Nano‑silica, also called “white carbon black,” consists of amorphous silica (SiO₂) particles 1‑100 nm in diameter. With the same composition as quartz (~46.8% Si, 53.3% O), it is a high‑purity (>99.9%) ultrafine white powder. Primary particles are spherical but typically form loose, fluffy agglomerates due to high surface energy.
Although insoluble in water, its surface contains abundant hydrophilic silanol groups (-SiOH), enabling easy chemical modification. The nanoscale size and high surface area significantly reinforce composites, while strong UV scattering and reflection improve anti‑aging performance. As a result, it serves widely as a reinforcing agent, UV blocker, and thixotropic agent in rubber, plastics, coatings, cosmetics and related industries.

5D-Materials Nano-silica Product Advantages

  1. Mechanical Enhancement: Acts as "nano reinforcement" to fill microscopic defects in materials, greatly improving strength, toughness, and wear resistance.
  2. Optical Optimization: Offers high transparency (does not obscure the base material's color) and efficient UV scattering/reflection, providing excellent anti-aging capabilities.
  3. Rheology Control: Exhibits shear-thinning behavior (thick at rest, thin under agitation), perfectly controlling sagging and application properties in coatings and adhesives.
  4. Surface Modification Compatibility:​ Through chemical modification, it can be tailored to match different systems (hydrophilic/hydrophobic), solving nanoparticle agglomeration issues and achieving perfect, uniform dispersion in various matrices .
  5. Safety & Stability: Chemically inert, heat-resistant, non-toxic, and harmless, making it suitable for food and pharmaceutical grade products .
  6. Multifunctional Platform:​ High specific surface area grants it multiple functions like adsorption, catalyst support, and thermal insulation .
  7. Production Capacity: Factory annual production target of 200,000 tons.
  8. Customization: Supports production line customization, product customization, and sample mailing for testing integration.

 

Nano-silica Application

  1. High-Performance Composites: Aerospace components, automotive parts, wind turbine blades, high-end sports equipment, ceramic tools, electronic packaging substrates.
  2. New Energy: Lithium-ion batteries, supercapacitors, photovoltaic cells, fuel cells.
  3. Electronics & Semiconductors: Flexible electronic devices, semiconductor manufacturing, electromagnetic shielding materials, chip/LED thermal interface materials.
  4. Biomedical: Targeted drug delivery carriers, bioimaging probes, biosensors, tissue engineering scaffolds.
  5. Aerospace & Defense: Spacecraft structural thermal insulation layers, bulletproof vests, armor, stealth materials, rocket fuel tanks.
  6. Environmental Remediation: Water pollution treatment, industrial exhaust gas purification, air purifier filter elements.
  7. Industry: Concrete and construction, coatings and paints, composites, ceramics, wastewater treatment, air purification, soil remediation.

 

What is Nano Silicon Dioxide?

The properties of nano‑silica arise from its nanoscale size (1‑100 nm) and amorphous SiO₂ structure. Its high specific surface area (50‑600 m²/g) and abundant surface silanol groups (–SiOH) confer strong surface activity, enabling excellent adsorption, catalytic support, and interfacial bonding. Being smaller than visible light wavelengths, it retains high transparency in composites while effectively scattering UV light (UVA/UVB) for UV protection. Nanoparticles reinforce matrices like “nano‑rebar” and, through hydrogen‑bonded networks, impart shear‑thinning thixotropy—controlling flow and sag in coatings and adhesives. It is chemically stable, heat‑resistant, non‑toxic, and biocompatible.

In essence, nano‑silica converts the inherent stability of silica into nanoscale surface activity, making it a versatile functional material that meets needs for reinforcement, protection, and processability.

Nano-silica Physicochemical properties

Property Category Key Parameters  Description & Significance
Basic Physical Particle Size Typically 1-100 nm.
Specific Surface Area 50-600 m²/g。
Morphology Primary particles are typically spherical; often appears as fluffy or network-like agglomerates in practice.
Density Tap density 0.05-0.2 g/cm³ (loose powder); true density consistent with amorphous SiO₂ (~2.2 g/cm³).
Optical Transparency Particle size smaller than visible light wavelength (380-750 nm). Exhibits high transparency when well-dispersed in a matrix.
UV Shielding Possesses strong scattering and reflection capabilities against ultraviolet light (especially UVA: 315-400 nm, UVB: 280-315 nm).
Surface & Chemical Surface Groups Surface is rich in silanol groups (-SiOH), making it hydrophilic and acidic. These are active sites for chemical modification (e.g., grafting silanes).
Chemical Stability Chemically inert. Heat-resistant. Insoluble in water and most acids except hydrofluoric acid; soluble in strong alkalis.
Biocompatibility Non-toxic, odorless. Amorphous silica is generally considered biocompatible and is widely used in food, pharmaceuticals, and cosmetics.
Modifiability Surface -SiOH can react with various coupling agents for hydrophilicity, hydrophobicity, or specific functionalities.
Mechanical & Rheological Reinforcement Effective stress transfer as nano-filler, enhancing tensile strength, hardness, toughness, wear resistance
Thixotropy 3D network via hydrogen bonding enables shear-thinning (sag resistance, beneficial for application and anti-sagging.
Thermal & Electrical Thermal Stability Heat-resistant, melting point ~1700°C (consistent with amorphous SiO₂).
Coefficient of Thermal Expansion Extremely low, similar to quartz glass (~0.5×10⁻⁶/K), aiding in the preparation of dimensionally stable composites.
Electrical Insulation An excellent electrical insulator with high resistivity and low dielectric constant.

Nano-silica Specifications

Product Model H-506
Key Indicators
Test Item Unit Test Standard Specification Range
1. Heating Loss % HG/T 3065—2008 ≤6.0
2. DBP Absorption mL/100g HG/T 3072—2008 220-250
3. Total Specific Surface Area m2/g GB/T 10722—2014 110-150
4. pH / HG/T 3067—2008 6~8
5. Conductivity μS/cm GB/T 34698—2017 ≤900
6. Average Particle Size μm GB/T 32698—2016 12-18
Application Area PE Battery Separator

 

Product Model H-620
Key Indicators
Test Item Unit Test Standard Specification Range
1. Heating Loss % HG/T 3065—2008 ≤7.0
2. Ignition Loss % HG/T 3066—2008 ≤7.0
3. Silica Content % HG/T 3062—2008 ≥98
4. DBP Absorption mL/100g HG/T 3072—2008 2.3~3.0
5.Total Specific Surface Area m2/g GB/T 10722—2014 150~200
6. Average Particle Size μm GB/T 32698—2016 9~ 13
7. pH / HG/T 3067—2008 6.0~7.5
8. Conductivity μS/cm GB/T 34698—2017 ≤200
9. Fe Content mg/kg Phenanthroline Spectrophotometry ≤150
Application Area Semi-transparent/transparent general-purpose high-temperature vulcanized silicone rubber and other general rubber products, including rubber sealing products, sealants, plastic fillers, etc.

 

Product Model H-995
Key Indicators
Test Item Unit Test Standard Specification Range
1. Heating Loss % HG/T 3065—2008 ≤3.0
2. Ignition Loss % HG/T 3066—2008 ≤5.0
3. Silica Content (Dry Basis) % HG/T 3062—2008 ≥98
4. DBP Absorption mL/100g HG/T 3072—2008 250±20
5. Total Specific Surface Area m2/g GB/T 10722—2014 165±15
6. Average Particle Size μm GB/T 32698—2016 10~ 112
7. pH / HG/T 3067—2008 6.0~7.5
8. Conductivity μS/cm GB/T 34698—2017 ≤200
Application Area Can be used to prepare various high-strength composites. Thermal insulation-type silica and its composites are mainly used in new energy vehicles, aerospace, industrial kilns, construction, and petrochemical fields.

The above are the main product models. You can choose based on your application area or contact us for more models suited to your scenario. 5D-Materials supports demand customization and sample mailing for compatibility testing.

 

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