AcoustoSizer II Nanoparticle Size and Zeta Potential Analyzer by Colloidal Dynamics
| Brand | Colloidal Dynamics |
|---|---|
| Origin | USA |
| Model | AcoustoSizer II |
| Particle Size Range | 10 nm – 100 µm |
| Zeta Potential Range | 0.5 nm – 30 µm |
| Temperature Control Range | 10–50 °C |
| Temperature Stability | ±0.1 °C |
| Ultrasonic Frequency Range | 1–20 MHz |
| Measurement Principle | Multi-frequency electroacoustic spectroscopy & ultrasonic attenuation spectroscopy |
| Sample Concentration Range | 0.1–40% v/v |
| Standard Sample Volume | 85 mL (optional 20 mL) |
| Measurement Time | Real-time, sub-second spectral acquisition per parameter |
Overview
The AcoustoSizer II Nanoparticle Size and Zeta Potential Analyzer, developed by Colloidal Dynamics (USA), is an advanced benchtop instrument engineered for the direct, label-free, and dilution-free characterization of concentrated colloidal dispersions. Unlike conventional light-scattering or electrophoretic mobility analyzers—which require extensive sample dilution, filtration, or pH adjustment—the AcoustoSizer II employs multi-frequency electroacoustic spectroscopy (EAS) coupled with ultrasonic attenuation spectroscopy (UAS) to simultaneously quantify particle size distribution, zeta potential, dynamic electrophoretic mobility spectra, pH, conductivity, and temperature in situ. This dual-spectroscopic approach enables robust physical property quantification across a broad dynamic range (10 nm–100 µm for size; 0.5 nm–30 µm for zeta-relevant particles) without altering native dispersion conditions—critical for high-concentration systems such as ceramic slurries, pharmaceutical suspensions, catalyst pastes, and industrial emulsions.
Key Features
- Direct measurement of particle size and zeta potential in undiluted samples up to 40% v/v solids concentration
- Patented multi-frequency electroacoustic transduction with integrated ultrasonic attenuation detection
- Modular sensor architecture featuring no moving parts—ensuring long-term mechanical stability and minimal maintenance
- High-precision thermostatic control (±0.1 °C) over 10–50 °C operating range, compatible with variable viscosity media
- High-voltage pulsed electric field excitation for enhanced signal-to-noise ratio in conductive and viscous matrices
- Flow-through sensor option for continuous process monitoring or integration into recirculating loop systems
- Automatic background electrolyte subtraction algorithm for accurate isoelectric point (IEP) determination
- Minimal sample requirement: 20 mL standard configuration available for precious or limited-quantity formulations
- Simultaneous acquisition of electrophoretic mobility spectra and ultrasonic attenuation spectra for cross-validated analysis
Sample Compatibility & Compliance
The AcoustoSizer II is validated for use with opaque, highly concentrated, and optically heterogeneous colloids—including ceramic suspensions, coal-water slurries, latex emulsions, pharmaceutical nanosuspensions, and mineral processing pulps—where optical techniques (e.g., DLS, laser diffraction) fail due to multiple scattering or absorption artifacts. Its compliance framework supports routine operation under GLP and GMP environments: raw data files include full audit trails (user ID, timestamp, instrument configuration, calibration history), and software supports 21 CFR Part 11–compliant electronic signatures when deployed with validated Windows 10/11 platforms. While not certified to a specific ISO standard, its electroacoustic methodology aligns with principles outlined in ISO 13322-2 (acoustical methods for particle sizing) and ASTM D7816 (standard practice for zeta potential measurement of colloidal dispersions).
Software & Data Management
Controlled via AcoustoSizer Studio—a native Windows 10/11 application—the system delivers automated workflows for batch analysis, titration sequences (pH or additive dosing), and real-time spectral visualization. The software includes built-in algorithms for deconvolution of bimodal and multimodal size distributions (log-normal, Gaussian, and custom kernel fitting), dynamic mobility spectrum inversion, and automatic IEP calculation with confidence intervals. All raw acoustic and electroacoustic spectra are stored in vendor-neutral HDF5 format, enabling third-party post-processing. Audit logs record every parameter change, calibration event, and user action—fully traceable for QA/QC documentation and regulatory submission packages.
Applications
- Ceramic and refractory slurry optimization (e.g., alumina, zirconia)
- Pharmaceutical nanosuspension stability assessment and formulation screening
- Electrolyte-dependent zeta potential mapping for isoelectric point determination in TiO₂, SiO₂, and Fe₃O₄ nanoparticles
- In-process monitoring of emulsion polymerization and latex coagulation kinetics
- Dispersion stability evaluation of pigment pastes, inkjet inks, and paper coating formulations
- Coal-water slurry rheology and surface charge correlation studies
- Biocolloid behavior in food-grade hydrocolloids (e.g., casein micelles, pectin gels)
- Catalyst support particle charging state analysis under varying ionic strength conditions
- Quality control of polishing slurries in semiconductor CMP processes
FAQ
Can the AcoustoSizer II measure zeta potential in highly conductive media (e.g., >100 mS/cm)?
Yes—electroacoustic detection is inherently insensitive to bulk conductivity, enabling reliable zeta potential determination in saline buffers, battery electrolytes, and industrial process streams where traditional electrophoretic methods fail.
Is sample filtration required prior to analysis?
No. The instrument is designed for direct analysis of as-received dispersions, including those containing micron-scale agglomerates or entrained air—provided the suspension remains pumpable and non-settling during measurement.
How does the system handle temperature-dependent zeta potential drift during extended titrations?
Integrated Peltier-based thermal regulation maintains ±0.1 °C stability throughout multi-hour titration protocols, and real-time temperature compensation is applied to all mobility calculations.
What calibration standards are needed for routine operation?
No colloidal reference materials are required. Electrolyte-based acoustic and electroacoustic calibrations use certified KCl solutions; instrument response is verified using factory-characterized sensor transfer functions stored in firmware.
Can the AcoustoSizer II interface with LIMS or SCADA systems?
Yes—via OPC UA and TCP/IP protocols, the software supports bidirectional data exchange with laboratory information management systems and industrial automation platforms for automated reporting and SPC charting.
