DT Instruments DT-100/DT-110 Ultrasound Particle Size Analyzer
| Brand | DT Instruments |
|---|---|
| Origin | USA |
| Model | DT-100 / DT-110 |
| Measurement Principle | Ultrasonic Attenuation Spectroscopy (UAS) |
| Particle Size Range | 5 nm – 1000 µm |
| Sample Concentration Range | 0.1–50% v/v (undiluted) |
| Operating Frequency Range | 1–100 MHz |
| Minimum Sample Volume (DT-110) | < 5 mL |
| Dispersion Media Compatibility | Aqueous, polar, and non-polar liquids |
| Data Management | Microsoft Access-based database |
| Calibration-Free Operation | Yes |
| Adjustable Transducer Gap | Yes |
| Compliance Context | Supports GLP/GMP-aligned workflows |
Overview
The DT Instruments DT-100 and DT-110 Ultrasound Particle Size Analyzers are engineered for direct, calibration-free characterization of concentrated heterogeneous dispersions using ultrasonic attenuation spectroscopy (UAS). Unlike optical techniques—such as laser diffraction or dynamic light scattering—UAS measures the frequency-dependent attenuation and sound speed of high-frequency acoustic waves propagating through a dispersion. This physical principle enables quantitative determination of particle size distribution (PSD), zeta potential (via electroacoustic measurement), rheological properties (complex viscosity, storage/loss moduli), solid volume fraction, and porosity—without sample dilution, centrifugation, or filtration. The instruments operate across a broad ultrasonic frequency band (1–100 MHz), allowing resolution of sub-5 nm nanoparticles up to 1000 µm agglomerates in their native state. Designed for industrial R&D and QC laboratories, the DT-100 accommodates standard sample volumes (typically 20–50 mL), while the DT-110 is optimized for low-volume analysis (< 5 mL), making it suitable for precious or highly regulated formulations such as biopharmaceutical intermediates and battery cathode slurries.
Key Features
- True undiluted analysis: Measures particle size distributions directly in concentrated suspensions and emulsions (0.1–50% v/v solids), eliminating dilution-induced artifacts and enabling real-time process monitoring.
- Dual-mode capability: Simultaneous acquisition of ultrasonic attenuation and sound speed spectra supports independent calculation of PSD and solid concentration—critical for slurry formulation control in CMP, ceramics, and lithium-ion battery manufacturing.
- Electroacoustic zeta potential: Integrated high-frequency electrophoretic mobility measurement provides surface charge characterization without electrode polarization errors common in conventional electrophoresis.
- Adjustable transducer gap: Precision-machined variable-gap cell allows optimization for viscosity, particle loading, and acoustic impedance matching—enhancing signal-to-noise ratio across diverse media (water, alcohols, hydrocarbons, ionic liquids).
- Self-validating operation: No reference standards or calibration curves required; absolute sizing relies on first-principles physics models (e.g., Epstein–Carhart–Allegra–Hawley theory for attenuation, Sheng–Liu model for electroacoustics).
- Robust hardware architecture: Stainless-steel wetted parts, temperature-stabilized Peltier-controlled cell housing (±0.1°C), and RF-shielded electronics ensure long-term repeatability under continuous operation.
Sample Compatibility & Compliance
The DT-100/DT-110 supports aqueous, polar organic (e.g., ethanol, DMF, NMP), and non-polar (e.g., toluene, hexane) dispersions—including opaque, highly viscous, or thermally sensitive systems where optical methods fail. Applications span pharmaceutical emulsions (e.g., IV lipid formulations), protein aggregates in monoclonal antibody solutions, ceramic green-body slurries, silicon anode suspensions, and porous catalyst pellets. From a regulatory perspective, raw data files (binary .DAT + metadata-rich .XML) are structured for traceability. When deployed within validated laboratory information management systems (LIMS), the Access-based database supports ALCOA+ principles: attributable, legible, contemporaneous, original, accurate, complete, consistent, enduring, and available. While the instrument itself does not embed electronic signatures, its data export schema aligns with FDA 21 CFR Part 11 readiness when paired with compliant IT governance.
Software & Data Management
Acquisition and analysis are executed via DT’s proprietary UltraScan software, built on a modular Windows platform. All raw spectra, model parameters, and derived results are stored in a relational Microsoft Access database (.ACCDB), enabling SQL-based querying, batch reporting, and integration with enterprise analytics tools (e.g., Tableau, Spotfire). Each measurement record includes full metadata: operator ID, timestamp, temperature, transducer gap setting, frequency sweep parameters, and user-defined sample descriptors. Software modules include PSD deconvolution (using constrained regularization algorithms), electroacoustic zeta potential calculation, multi-phase density modeling, and time-resolved kinetic analysis for dissolution/crystallization studies. Export formats include CSV, PDF reports (with embedded uncertainty estimates), and ASTM E2937-compliant XML for inter-laboratory data exchange.
Applications
- Pharmaceutical development: Quantifying micelle formation kinetics, protein–resin binding affinity in chromatographic media, and undiluted microemulsion stability without surfactant interference.
- Battery materials: Monitoring graphite/SiOx slurry homogeneity, binder migration during drying, and cathode particle fracture during calendering—directly in production-relevant concentrations.
- Advanced ceramics: Controlling green-body density uniformity by correlating ultrasonic porosity metrics with sintered part shrinkage.
- Food & cosmetics: Characterizing fat crystal networks in margarines and wax-based ointments where birefringence or multiple scattering preclude optical methods.
- Environmental science: Sizing mineral colloids in groundwater simulants and assessing floc structure evolution during coagulation-flocculation trials.
FAQ
Does the DT-110 require sample dilution for accurate sizing?
No. The DT-110 applies ultrasonic attenuation spectroscopy, which inherently accommodates high-concentration dispersions (up to 50% v/v) without dilution—preserving native particle interactions and aggregation states.
Can the system measure zeta potential in non-aqueous media?
Yes. Electroacoustic zeta potential is measured via colloid vibration current (CVI) detection and is valid in polar solvents with sufficient ionic conductivity (e.g., ethanol/water mixtures, propylene glycol); performance in low-conductivity hydrocarbons requires added electrolyte tracers.
Is temperature control available during measurement?
Yes. Both models integrate Peltier-based thermostatic control (range: 5–60°C, stability ±0.1°C), critical for studying temperature-dependent phase transitions or polymer conformation changes.
How is data integrity ensured for regulated environments?
Raw data files contain embedded digital signatures, acquisition timestamps, and hardware configuration logs. When hosted on networked, permission-controlled servers with backup protocols, the system meets baseline expectations for GLP audit readiness and supports 21 CFR Part 11 compliance through supplemental procedural controls.
What maintenance is required for long-term operational reliability?
Annual verification of transducer alignment and acoustic coupling fluid integrity is recommended. No consumables (e.g., cuvettes, filters, or lamps) are used; stainless-steel flow cells are cleaned in situ using solvent flush protocols defined in the user manual.
