Quality Testing Methods for Silica Sol
Release date:
2026-03-15
The quality inspection of silica sol requires a comprehensive assessment of multiple key indicators, with different application scenarios placing varying degrees of emphasis on different parameters.
🧪 Core Physicochemical Parameter Testing
Silica content
- Gravimetric Method Dry at 105–120°C until constant weight is achieved, then calculate the mass fraction of solid residue; this method offers high precision but is time‑consuming.
- Density Method/Specific Gravity Method Determine the density using a hydrometer or a density bottle, then quickly estimate the value by referencing the specific gravity–concentration relationship chart (which requires periodic calibration).
- X‑ray fluorescence spectroscopy (XRF) Non‑destructive and rapid measurement, suitable for real‑time monitoring on production lines.
pH value
- Use a precision pH meter for direct measurement to ensure the value remains within the stable range (alkaline pH 8.5–10, acidic pH 2–4).
Viscosity
🔬 Particle Size and Dispersion Analysis
Particle size distribution
- Samples ≤20 nm Titration: The amount of surface silanol groups is determined by titration with NaOH, and the particle size is calculated using an empirical formula.
- >20 nm samples Dynamic light scattering measures the fluctuations of scattered light due to Brownian motion to determine the hydrodynamic diameter and polydispersity index.
- Precise Analysis Transmission electron microscopy allows for direct observation of morphology and particle size; the results are the most reliable, but the cost is high.
Stability Assessment
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