π± Using a smartphone to measure contact angle of liquid droplets on surfaces.
βοΈ Contact angle is a method to characterize the wetting properties of surfaces.
π§ Hydrophilic surfaces have a contact angle less than 90 degrees, while hydrophobic surfaces have a contact angle greater than 90 degrees.
π‘ The lens attachment system for measuring contact angle using a smartphone is cost-effective and portable.
π° The cost of the lens attachment system is at least 10 times cheaper than the VCA system.
π The lens attachment system provides accurate contact angle measurements within a small difference compared to the VCA system.
π± To measure contact angle, you will need a smartphone with a 4 megapixel camera or higher and a smartphone lens attachment.
π» Download the ImageJ software (version 1.46) with Java and the drop analysis plugin.
π½ Install ImageJ and note the installation location on your computer's hard drive.
π± The video provides instructions on how to measure contact angles using a smartphone.
π The lens attachment components of the smartphone need to be removed before conducting contact angle measurements.
π The sample should be positioned flush with the edge of a workbench or table in a well-lit environment for accurate measurements.
πΈ Position the smartphone close to the droplet and use the zoom and autofocus to capture a high-resolution image.
π» Transfer the droplet images to a computer for analysis using email, file-sharing programs, or USB connection.
π¬ Open the droplet image in ImageJ for analysis and practice using the provided sample image.
πΈ The image of the droplet must be grayscale and have a well-defined droplet edge.
π The sample surface should have a minimal tilt angle and be close to the horizontal plane.
π¬ Magnification is often required for smartphone lens attachments to aid in measuring the static contact angle.
π± Contact angle measurement using a smartphone and lens attachment is a cheaper alternative to video contact angle systems.
βοΈ The video explains the theory and definition of droplet contact angles and how they characterize surface wettability.
π The Drop Snake user manual provides instructions for using the toolbar buttons and troubleshooting tips for the plugin.
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