๐ฑ Using a smartphone to measure contact angle of liquid droplets on surfaces.
โ๏ธ Contact angle is a method to characterize the wetting properties of surfaces.
๐ง Hydrophilic surfaces have a contact angle less than 90 degrees, while hydrophobic surfaces have a contact angle greater than 90 degrees.
๐ก The lens attachment system for measuring contact angle using a smartphone is cost-effective and portable.
๐ฐ The cost of the lens attachment system is at least 10 times cheaper than the VCA system.
๐ The lens attachment system provides accurate contact angle measurements within a small difference compared to the VCA system.
๐ฑ To measure contact angle, you will need a smartphone with a 4 megapixel camera or higher and a smartphone lens attachment.
๐ป Download the ImageJ software (version 1.46) with Java and the drop analysis plugin.
๐ฝ Install ImageJ and note the installation location on your computer's hard drive.
๐ฑ The video provides instructions on how to measure contact angles using a smartphone.
๐ The lens attachment components of the smartphone need to be removed before conducting contact angle measurements.
๐ The sample should be positioned flush with the edge of a workbench or table in a well-lit environment for accurate measurements.
๐ธ Position the smartphone close to the droplet and use the zoom and autofocus to capture a high-resolution image.
๐ป Transfer the droplet images to a computer for analysis using email, file-sharing programs, or USB connection.
๐ฌ Open the droplet image in ImageJ for analysis and practice using the provided sample image.
๐ธ The image of the droplet must be grayscale and have a well-defined droplet edge.
๐ The sample surface should have a minimal tilt angle and be close to the horizontal plane.
๐ฌ Magnification is often required for smartphone lens attachments to aid in measuring the static contact angle.
๐ฑ Contact angle measurement using a smartphone and lens attachment is a cheaper alternative to video contact angle systems.
โ๏ธ The video explains the theory and definition of droplet contact angles and how they characterize surface wettability.
๐ The Drop Snake user manual provides instructions for using the toolbar buttons and troubleshooting tips for the plugin.
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