Low-Cost Contact Angle Measurement System for QCM Sensor
Abstract: Hydrophobicity is
one of the importance factors in the surface properties of materials. This work
presents the development of a low-cost contact angle measurement system based
on goniometric measurement using an inexpensive digital camera, tilt control
system for surface alignment and curvature approximation algorithm to determine
the contact angle between the solid and spherical cap of a water droplet. The
design is specifically targeted for measuring the contact angle of a Quartz
Crystal Microbalance sensor in the form of HC-49/U with a disc diameter of
8.7mm.The contact anglemeasurement using goniometric measurement depends on the
quality of captured image and calculation method for the angle determination.
Proper alignment of the sample surface is required to minimize the discrepancy
of the angle measurement of water drop surface profile caused by gravity. A
PIC18F4550 microcontroller is used to control the motorized tilt platform to
reduce the gap between left and rightcontact angle value. Circle fit algorithm
to determine the contact angle value from the captured image is used. Using the
motorized tilt control system and circle fit algorithm, the developed contact
angle measurement system able to measure the contact angle with discrepancy
less than 1O.
Author: Setyawan P. Sakti,
Rizal Y. Aji, Layli Amaliya, Masruroh
Journal Code: jptkomputergg170028
