Attension Sigma 701 Advanced Extended Surface Tensiometer
| Brand | Attension |
|---|---|
| Origin | Finland |
| Model | Sigma 701 |
| Maximum Sample Weight | 5.0 g |
| Resolution | 0.001 mg |
| Surface Tension Range | 0–1000 mN/m |
| Surface Tension Resolution | 0.001 mN/m |
| Stage Vertical Speed | 0.01–500 mm/min |
| Standard Sample Vessel Diameter | 50 mm or 70 mm |
| Temperature Range | −10 to +100 °C (standard), optional −30 to +130 °C or ambient to +250 °C |
Overview
The Attension Sigma 701 Advanced Extended Surface Tensiometer is a high-precision gravimetric instrument engineered for the quantitative characterization of interfacial phenomena at liquid–air and liquid–liquid interfaces, as well as solid–liquid interactions. It operates on the Wilhelmy plate and Du Noüy ring principles—two ISO 1409- and ASTM D971-compliant methods—delivering traceable, reproducible measurements of surface tension (ST), interfacial tension (IT), dynamic contact angle (DCA), and critical micelle concentration (CMC). Designed for rigorous R&D environments—including colloid science, formulation development, pharmaceutical stability assessment, and functional coating optimization—the Sigma 701 integrates metrological-grade microbalance technology with thermally stabilized sample handling and programmable fluid dynamics control. Its modular architecture supports extended operational envelopes, including high-temperature measurement up to +250 °C and cryogenic capability down to −30 °C, enabling studies across diverse physicochemical regimes without hardware reconfiguration.
Key Features
- Gravimetric measurement platform with ultra-sensitive electromagnetic force compensation balance (0.001 mg resolution) ensuring long-term stability and minimal drift
- Automated dual-method operation: Wilhelmy plate and Du Noüy ring modes selectable via software; includes automatic ring calibration and buoyancy correction algorithms
- Motorized vertical stage with continuously adjustable speed (0.01–500 mm/min) for precise immersion/retraction profiling and dynamic contact angle acquisition
- Integrated Peltier- or oil-bath-compatible temperature control system with real-time digital readout and ±0.1 °C stability over full range
- Programmable magnetic stirrer with variable RPM control for homogeneous surfactant dissolution and CMC endpoint determination
- Full computer automation: all measurement sequences—including zeroing, tare, balance, and start-point reset—are executed under software command with audit-trail logging
Sample Compatibility & Compliance
The Sigma 701 accommodates standard cylindrical sample vessels (50 mm or 70 mm diameter), compatible with common laboratory glassware and custom high-temperature/quartz cells. It supports aqueous, organic, molten polymer, and ionic liquid systems, with robust corrosion-resistant components for aggressive media. Measurement protocols align with international standards including ISO 1409 (plastics—determination of surface tension of plastics), ISO 6295 (petroleum products—determination of interfacial tension), ASTM D1331 (surface and interfacial tension of coatings, inks, and related products), and USP (analytical instrument qualification). Data integrity meets FDA 21 CFR Part 11 requirements when deployed with validated software configuration and electronic signature workflows.
Software & Data Management
The OneAttension software suite provides a unified interface for method setup, real-time parameter visualization, and post-acquisition analysis. It enables automated CMC titration with incremental surfactant dosing, dynamic contact angle hysteresis mapping, and time-resolved surface tension profiling (e.g., adsorption kinetics). All raw data—including force vs. time, temperature logs, and stirrer RPM—are timestamped and stored in open-format CSV and HDF5 files. Audit trails record user actions, instrument states, and calibration events, supporting GLP/GMP compliance. Optional integration with LIMS platforms is available via OPC UA or RESTful API endpoints.
Applications
- Formulation science: surfactant selection, emulsion stability prediction, and micellization thermodynamics
- Pharmaceutical development: excipient–API interfacial compatibility, lyophilization buffer optimization, and inhalation aerosol droplet formation modeling
- Materials engineering: hydrophobic/hydrophilic surface modification validation, plasma-treated polymer characterization, and anti-fouling coating performance assessment
- Food & cosmetics: ingredient interaction mapping, foam stability quantification, and sensory attribute correlation with wetting behavior
- Academic research: fundamental studies of Langmuir monolayers, nanoparticle–interface assembly, and temperature-dependent interfacial phase transitions
FAQ
What measurement methods does the Sigma 701 support?
Wilhelmy plate and Du Noüy ring methods, both compliant with ISO 1409 and ASTM D971.
Can the instrument measure interfacial tension between two immiscible liquids?
Yes—it supports liquid–liquid interfacial tension measurement using either method with appropriate probe selection and density correction.
Is temperature control fully integrated and software-synchronized?
Yes—temperature setpoint, ramp rate, and dwell time are defined within measurement protocols and logged alongside force data.
Does the system support automated CMC determination?
Yes—via integrated syringe pump control (optional accessory) or manual dosing with real-time ST tracking and derivative-based endpoint detection.
What level of regulatory compliance does the Sigma 701 meet out-of-the-box?
It provides foundational capabilities for 21 CFR Part 11 compliance; full validation requires site-specific IQ/OQ/PQ documentation and software configuration review.
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