<p style="font-size: 11.9999990463257px; ">DataPhysics provide several sets of optical standards for the validation/verification of total instrument (hardware and software) performance. Each glass slide features a standard sessile, pendant drop or lamella contour for image capture and subsequent analysis. The comparison of the calculated contact angle or the surface/interfacial tension mea­sure­ment with that stated on the slide is a crucial factor in the evaluation of instrument performance and reliability. All slides are manufactured with the highest precision, as per ISO 9001, in a controlled photolithographic process to serve as reliable references for the precision of measured data.</p>
<ul style="font-size: 11.9999990463257px; "><li>OCAS basic set&nbsp;three optical drop shape standards for the validation of the contact angle and the surface and interfacial tension measurement according to the height/width method, the Young-Laplace method, and the pendant drop method.</li><li>OCAS/HW&nbsp;­four optical contact angle standards according to the height/width method (15° ± 0.09°, 30° ± 0.09°, 60° ± 0.07°, 120° ± 0.04°).</li><li>OCAS/HW-LOW&nbsp; three optical contact angle standards according to the height/width method (15° ± 0.09°, 10° ± 0.09°, 5° ± 0.09°).</li><li>OCAS/YL&nbsp;three optical contact angle standards according to&nbsp; the Young/Laplace method (30° ± 0.09°, 60° ± 0.07°, 120° ± 0.04°).</li><li>OCAS/YL-HIGH&nbsp;four optical contact angle standards according to&nbsp; the Young/Laplace method (160° ± 0.04°, 165° ± 0.04°, 170° ± 0.04°, 175° ± 0.04°).</li><li>OCAS/PD&nbsp;four optical Pendant Drop standards (20, 35, 50 and 72.8 mN/m; ± 0.02 mN/m).</li><li>OCAS/LA&nbsp; two optical lamella standards (20 and 35 mN/m; ± 0.02 mN/m) and one Vertical-Rod standard (CA = 30° ± 0,09° and SFT 50 ± 0,02 mN/m).</li></ul>
<h2>KeyPad for OCA 35/40 Micro KP 40</h2>
<p style="font-size: 11.9999990463257px; ">For controlling, outside of the software, the position of the motorized X-, Y-, Z-axes, the tilting angle of a tilting base unit, TBU 90E, the angle of an electronic turn table, ETT, and of the focus and observation angle (only OCA 40) of the optical system. The X,Y,Z co-ordinates of a sample table or the angle/position of a tilting unit/turn table, adjusted by the keypad, can be transferred into the SCA 20 software in order to facilitate the automated return to an optimised position during a subsequent automated measurement routine.</p>
<h2>Top view video system module for OCA TV-VS</h2>
<p style="font-size: 11.9999990463257px; ">All OCA systems can be equipped with the top view video system TV-VS, to provide an alternative view of the positioning of the dispensed drop on the surface. The USB camera, with up to 87 images per second, together with the high performance 6x parfocal zoom lens and the adjustable observation angle enables a detailed view to your sample.</p>
<h2>Oscillating drop generator ODG 20</h2>
<p style="font-size: 11.9999990463257px; ">For the measurement of surface elasticities and for relaxational studies at phase boundaries, DataPhysics has developed the oscillating drop generator, ODG 20, and the innovative oscillating drop generator ODG 20P with a high resolution pressure sensor. This extension to the pendant drop contour analysis capability of the OCA series – based on a piezoelectric transducer – excites oscillating drops with a wide range of frequencies and amplitudes. Periodic variations in the drop volume, or alternatively in the drop shape, with constant volume, can be performed. The excitation frequency ranges up to 50 Hz, depending on the density and viscosity of the fluid. The amplitude of the axis-symmetric oscillations varies from micrometers to millimeters. The oscillating drops can be analyzed by conventional drop contour analysis or by the new approach of pressure measurement with the high-performance pressure sensor (ODG 20P).</p>
<h2>Electro wetting platform EWP 100</h2>
<p style="font-size: 11.9999990463257px; ">The way in which a defined electrical field influences the wetting and adsorption behaviour of modern, engineered, materials is becoming relevant to an increasing number of applications. The EWP 100 facilitates the analysis of pendant drops and sessile drops, incident with solid surfaces, under a user definable electrical field.</p>
<h2>Liquid injection system LIA-MD</h2>
<p style="font-size: 11.9999990463257px; ">The LIA-MD facilitates the study of the effect, on a drops surface, of adding a second liquid directly into that first drop. This special accessory enables the rapid addition of a second liquid, usually a surface-active or chemically reactive phase, into a drop already visible through the OCA optics and displayed on the monitor. The relaxation (back to interfacial equilibrium with the surrounding medium) of the original drop can be observed and evaluated via the SCA software. The overall response time, together with the rates of change of surface and interfacial tensions, during the relaxation process, are indicative of the reactivity of the liquids under study. Developments of synthetic eye and lung fluids, for medical purposes, have already benefitted from studies of this type and more innovative applications are expected in the field of protein and surfactant engineering.</p>