Contact angle measurement - patrick-shamberger/PHATE_Lab_Handbook GitHub Wiki

System Specifications Syringe Pump Data Sheet.pdf :

  • Syringe sizes: Up to 60 mL. 140 mL partially filled.
  • Number of syringes: 1
  • Motor type: Step motor
  • Motor steps per revolution: 400
  • Micro-stepping: 1/8 to 1/2 depending on motor speed
  • Advance per step: 0.2126 μm to 0.8504 μm depending on motor speed
  • Motor to drive screw ratio: 15/28
  • Drive screw pitch: 20 revolutions/”
  • Power connector: 2.1 mm, center positive, DC
  • Voltage at power connector: 12V DC
  • Amperage: 750 mA maximum
  • Power supply type: External wall adapter, country and power source specific
  • Power supply output rating: 12V DC, 1000 mA regulated
  • Stage temp: 100 C, 0.1 C increments
  • Dimensions: 8 3/4” x 5 3/4” x 4 1/2” (L x W x H) (22.86 cm x 14.605 cm x 11.43 cm)
  • Maximum speed: 3.7742 cm/min
  • Minimum speed: 0.004205 cm/hr
  • Maximum pumping rate: 1257 mL/hr with a B-D 60 mL syringe
  • Minimum pumping rate: 0.73 μL /hr with a B-D 1 mL syringe
  • Maximum force: 35 lbs. at minimum speed, 18 lbs. at maximum speed
  • Syringe inside diameter range: 0.100 to 50.00 mm

Accuracy:

  • Within +/- 1% over length of syringe, exclusive of syringe variations.
  • Reproducibility: +/- 0.1%

Experimental Setup:

Location: Doherty 216

Contact angle of a liquid droplet on a solid surface can be characterized. A camera imaging a liquid droplet with a backdrop light is used to find the contact angle. Videos from the T8i camera (Dr. Dion Antao's camera) captured on a SanDisk were used and uploaded to a computer. Single frames were captured (I used a website from youfiles.herokuapp.com, linked as: https://youfiles.herokuapp.com/videodictionary/?m=Video_Player_Drive).

ImageJ (Download here: https://imagej.net/ij/download.html) and contact angle plugin (Download here: https://imagej.net/ij/plugins/contact-angle.html) was used to find contact angle and measure baseline diameter of each droplet. The syringe needle tip was used as a measurement reference for baseline diameter measurements of the droplet.

Picture of Ga Project schematic_Schematic_With 2 dimensions_Cropped image Jiahui Guo, Ruisong Wang, Shiyu Zhang, and Dion S. Antao The Journal of Physical Chemistry C 2023 127 (36), 18167-18175 DOI: 10.1021/acs.jpcc.3c04095

Example Experimental Write-ups: From Dr. Antao's Group: Temperature Dependency of the Apolar Surface Tension Component for Water and Its Role in Classifying Apolar and Polar interfacial Interactions (From Dr. Antao's Group).pdf