Alfa Chemistry: Your Trusted Partner in Advanced Colloidal Materials
Colloidal silica, a stable dispersion of amorphous silicon dioxide (SiO2) nanoparticles in liquid media, is a cornerstone of nanotechnology and industrial innovation. At Alfa Chemistry, we engineer colloidal silica particles with precision, offering uniform size distribution, exceptional stability, and tailored surface functionalities. Our products serve industries ranging from electronics and coatings to biomedical research and catalysis, empowering breakthroughs in material science and engineering.
Colloidal silica consists of fine, amorphous, and typically spherical silicon dioxide (SiO2) nanoparticles dispersed in a liquid, most commonly water. These particles, ranging in size from 2 nm to 150 nm, form stable suspensions due to their surface charge, which prevents aggregation and settling. The random distribution of [SiO4] tetrahedra within each particle distinguishes amorphous colloidal silica from crystalline forms like quartz.
Our colloidal silica range is meticulously categorized to meet diverse industrial and research needs:
Particle Sizes: 9–130 nm (e.g., 10–15 nm, 70–90 nm)
Solid Content: 24–31%
Low Sodium Variants: Na ≤0.05–0.08% (ideal for electronics and optics).
Particle Sizes: 7–130 nm (e.g., 8–12 nm, 18–22 nm with Na<60 ppm).
High-Purity Options: Solid content up to 41%, tailored for catalysis and coatings.
Particle Sizes: 9–80 nm (e.g., 11–13 nm, 80 nm).
Applications: Adhesives, surface modification, and charge-stabilized systems.
Ultra-Low Contaminants: Na<35 ppm (e.g., 19–21 nm, 75–85 nm).
Critical for biomedical and semiconductor applications.
Particle Sizes: 6–120 nm with pH ranges 2.3–10.0.
Concentration Options: 20–40 wt.% for precision casting and optical films.
Functionalized Surfaces: Amino, epoxy, PEGylated, or hydrophobic coatings.
Custom Solvents: Isopropyl alcohol, methyl ethyl ketone, epoxy resins, and more.
Hollow Silica Nanospheres: 80–100 nm diameter, >99.9% purity (targeted drug delivery, lightweight composites).
Quick-Drying Silica Sol: 7–15 nm, solid content 28–32% (rapid-coating formulations).
| Category | Size Range | Key Applications |
|---|---|---|
| Ultra-Small | 2–10 nm | Drug delivery, nanocomposites, sensors |
| Small | 10–50 nm | Catalysis, optical coatings |
| Intermediate | 50–100 nm | Adhesives, abrasives, UV resins |
| Large | 100–130 nm | Precision casting, thick-film coatings |
| Industry | Recommended Product | Critical Parameters |
|---|---|---|
| Electronics | Low-sodium silica sol (e.g., 20 nm, Na<35 ppm) | Ultra-pure, solvent-based, pH 4–8 |
| Biomedical | PEGylated silica (10 nm, aqueous dispersion) | <20 nm, cytotoxicity-tested |
| Automotive Coatings | 80 nm silica in UV-curable resin | High scratch resistance, flexibility |
| Catalysis | Ammonium-type silica sol (10–15 nm, 39–41% solid content) | High surface area, thermal stability |
| Energy Storage | Hollow silica nanospheres (80–100 nm) | Low density, high porosity |
5+ Years in colloidal nanotechnology.
Rigorous QC, batch-to-batch consistency.
Fast shipping with temperature-controlled packaging.
From formulation optimization to scale-up.
Q: How do I select between acidic and ammonium-type silica sol?
A: Acidic variants (pH 2–4) perform best for metal surface treatments while ammonium types (pH 8–10) function optimally in catalysis and alkaline settings.
Q: Can I request custom solvent formulations?
A: Yes! We offer silica sols in over 20 solvents, including MEK, NMP, and epoxy resins.
Q: What is the shelf life of your products?
A: 12–24 months when stored at 4–25°C. Organic solvent-based dispersions typically have longer stability. Please refer to the specific product description.
Q: How does nano silica improve asphalt durability?
A: Enhances binder-aggregate adhesion, reducing thermal cracking.
Q: What is the difference between colloidal and precipitated nano silica?
A: Colloidal = liquid dispersion; precipitated = dry powder with higher surface area.
Q: What are the production and dispersion methods of nano-silica?
Through careful application these methods achieve precise control over particle dimensions as well as purity and compatibility standards. Alfa Chemistry delivers specialized synthesis services alongside optimized dispersion solutions designed for unique industrial requirements.
Our Services: Colloidal Silica Modification
Q: Can nano silica replace carbon black in tires?
A: Yes! Silica reduces rolling resistance, improving fuel efficiency.
Q: How does nano silica compare to silica fume in concrete?
A: Nano silica (10–50 nm) offers higher reactivity and surface area than silica fume (100–500 nm), enabling lower dosages and better performance.
Q: Can I use colloidal silica in 3D printing resins?
A: Yes! Our 20–50 nm dispersions improve resin viscosity and part strength.
Q: What causes silica nanoparticles to aggregate?
A: High ionic strength or pH shifts. Electrosteric stabilization prevents this—ask our team for formulation tips.
(Zhuo Xu, et al. 2025)The pharmaceutical industry reports that between 60% and 70% of candidate drugs in development face low solubility issues that significantly obstruct clinical trial success and commercialization. Xu Zhuo with his team created a novel nano-silica material through physical adsorption to address this fundamental issue. The advanced material features nano-colloidal silica spheres that offer an extremely high specific surface area. Through special treatment methods, the density of silanol groups on the surface of the material has reached more than four times that of ordinary silica materials. Using competitive adsorption strategies, the solubility of poorly soluble drugs may be increased by two to three orders of magnitude, converting water molecules from obstacles to catalysts for drug dissolution. This research provides a new solution to the problem of bioavailability of poorly soluble drugs.
Transform Your Industry with Precision Nano Solutions
Contact Alfa Chemistry Today for Customized Colloidal Silica!
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