Acoustic Bubble Suppression by Constructing a Hydrophilic Coating on HDPE Surface.

Area of Science:

• Materials Science
• Surface Chemistry
• Acoustics

Background:

• Ultrasonic bubbles on device surfaces cause signal issues in sonochemistry by reflecting sound waves.
• Controlling bubble formation is crucial for improving the performance and lifespan of acoustic devices.

Purpose of the Study:

• To develop a method for suppressing ultrasonic bubbles on high-density polyethylene (HDPE) surfaces.
• To enhance the stability and durability of piezoelectric sensors in harsh environments.

Main Methods:

• Coating HDPE surfaces with an ultrathin polydopamine polymer layer to create a hydrophilic surface.
• Testing bubble elimination in water and diesel exhaust fluid solutions under sonication.
• Evaluating sensor performance, stability at elevated temperatures, and mechanical properties via abrasion tests.

Main Results:

• The hydrophilic coating (contact angle < 45°) effectively eliminated bubbles during sonication in various solutions.
• Piezoelectric sensor operation extended to over 500 hours, compared to less than 2 hours for uncoated sensors.
• Coated sensors demonstrated high thermal stability (60-80 °C) and improved mechanical strength for long-term use.

Conclusions:

• Hydrophilic polymer coatings are effective in suppressing acoustic bubbles on HDPE surfaces.
• This technique significantly improves the operational stability and durability of acoustic sensors.
• The method has broad applications in sonochemistry, acoustic sensors, and nondestructive testing.