HARKE SPCA-X1 Video-Based Optical Contact Angle Analyzer

Overview

The HARKE SPCA-X1 is a precision-engineered video-based optical contact angle analyzer designed for rigorous surface and interfacial characterization in academic research laboratories, quality control environments, and materials development facilities. It operates on the principle of sessile drop analysis—capturing high-resolution images of liquid droplets deposited on solid substrates and applying advanced geometric fitting algorithms to determine the contact angle at the three-phase boundary (solid–liquid–vapor). Complementing static measurements, the system supports dynamic contact angle acquisition via expansion–contraction cycles and tilting (roll-off) methods, enabling quantification of advancing, receding, and sliding angles—critical parameters for assessing surface heterogeneity, wettability hysteresis, and functional coating performance. The instrument integrates a motorized XYZ stage, programmable syringe dispenser, and calibrated optical train with variable magnification (0.7×–4.5×), ensuring reproducible imaging across diverse sample geometries—from rigid plates and thin films to porous papers, fibers, and powdered compacts.

Key Features

• Benchtop modular architecture with robust aluminum frame and vibration-damped base for stable long-term operation
• High-fidelity USB 3.0 camera system delivering real-time image capture at 30 fps standard; optional ultra-high-speed modules support up to 1000 fps for rapid dynamic phenomena
• Eight built-in contact angle calculation algorithms—including circle, ellipse, and height-width fitting—each validated against NIST-traceable reference standards
• Motorized sample stage with ±0.1 mm positional repeatability and 100 mm × 120 mm usable area, compatible with standard Petri dishes, wafer carriers, and custom fixtures
• Integrated interfacial tension measurement capability via pendant drop analysis (Young–Laplace curve fitting), covering 0–1000 mN/m with 0.01 mN/m resolution
• SPCA 1.0 software platform featuring automated droplet detection, time-lapse sequence acquisition, batch processing, and export-ready data formatting (CSV, PNG, TIFF, XML)
• Compliance-ready design supporting audit trails, user access levels, and electronic signature functionality aligned with GLP and FDA 21 CFR Part 11 requirements

Sample Compatibility & Compliance

The SPCA-X1 accommodates a broad spectrum of solid substrates without modification: flat rigid surfaces (glass, silicon, metals), flexible films (PET, PE, PTFE), fibrous media (filter paper, nonwovens), anisotropic materials (wood veneers, textiles), and granular assemblies (pressed powders, carbon electrodes). Its open-stage configuration allows direct integration with environmental chambers (optional) for controlled humidity or temperature studies. All measurement protocols align with internationally recognized standards, including ISO 19403-2 (contact angle determination), ASTM D7334 (surface energy of polymer coatings), and GB/T 24368–2009 (hydrophobic contaminant assessment on glass surfaces). Full documentation packages—including factory calibration certificates, uncertainty budgets, and IQ/OQ templates—are provided to facilitate regulatory submissions and laboratory accreditation (ISO/IEC 17025).

Software & Data Management

SPCA 1.0 is a Windows-native application engineered for scientific integrity and workflow efficiency. It provides synchronized hardware control (stage, dispenser, illumination, camera), real-time droplet contour extraction using adaptive edge detection, and non-linear regression fitting of Young–Laplace equations for interfacial tension. Data files embed metadata (timestamp, operator ID, instrument serial number, environmental conditions) and support version-controlled project archiving. Export options include tabular reports with statistical summaries (mean, SD, CV%), annotated images with scale bars and measurement overlays, and time-series plots for dynamic contact angle evolution. The software supports LIMS integration via ODBC and includes configurable report templates compliant with internal SOPs and external audit requirements.

Applications

• Surface energy quantification of polymer films and packaging materials using Owens–Wendt or Wu harmonic mean models
• Quality assurance of hydrophobic/hydrophilic coatings on medical devices, microfluidic chips, and MEMS components
• Characterization of inkjet printability, adhesive bonding readiness, and anti-fouling behavior of biomaterials
• Colloid and interface chemistry research: surfactant adsorption kinetics, nanoparticle dispersion stability, Pickering emulsion formation
• Forensic and conservation science: moisture uptake in historical parchment, degradation mapping of aged varnishes
• Electrode wettability assessment in battery R&D (e.g., cathode slurry penetration into porous separators)

FAQ

What contact angle methods does the SPCA-X1 support?
Sessile drop (static and dynamic), captive bubble, immersion, tilting (roll-off), and pendant drop—enabling advancing/receding angle, sliding angle, and interfacial tension determination.
Is the system compatible with environmental control accessories?
Yes—optional humidity-controlled chambers (5–95% RH) and temperature-regulated stages (−20°C to 80°C) integrate seamlessly via standardized mounting interfaces and software-triggered parameter logging.
Can the SPCA-X1 measure contact angles on powders or rough surfaces?
Yes—using the Washburn capillary rise method (with optional powder cell fixture) or by analyzing multiple droplet positions to generate statistical wettability maps.
Does the software support GMP/GLP-compliant data handling?
Yes—SPCA 1.0 includes role-based user authentication, immutable audit trails, electronic signatures, and 21 CFR Part 11–compliant electronic records.
What calibration standards are supplied with the instrument?
NIST-traceable contact angle reference slides (10°, 60°, 110°), certified stainless steel ring for du Noüy ring method validation, and calibration certificate with measurement uncertainty statement.