PFP MB Creation
Primary Equipment:
15-660 Amplified Ultrasound Transducer
Created: February 23, 2010 by Tony Butterfield
Revised: August 16, 2010 by Tony Butterfield
University of Utah, Chemical Engineering
Latex Container Preparation:
- Wash latex glove finger with DI H2O 4 times.
- Fill latex glove finger with DI H2O.
- Clip to seal off and sonicate for 5 min in the UES 15-660.
- Amp = 5, Pulse = 10, Rep = 1, Freq = 5.5.
- Empty and repeat sonication with new water.
- Empty, rinse, and allow to dry before use.
MD Creation:
- Inject ml of filtered 0.25% PEG/PLLA into a prepared latex container.
- Leave open to air and placed in water at 42C (Temperature = 30 on Aquasonic 50D)
- Heat for 1 Hr to degas, sonicate for the last half hour.
- Seal liquid with clip, sure to keep any air from the liquid (this may mean sacrificing a small amount of liquid).
- Place in fridge for 15 min.
- With a cold pipette tip from the freezer, add ~wtp_pfp*vol*10~dv =wtp_pfp*vol*10 microliters PFP ( wt%) to surfactant solution. Do all this in the fridge to keep it cold (move pfp bottle to fridge).
- Seal the glove tip again with a clip, sure to keep air out, carful to not touch PFP drop.
- Sonicate the sample for 10 cycles with the UES 15-660, skipping every other cycle to keep from overheating the solution (20 cycles total).
- Amp = 2, Pulse = 10, Rep = 1, Freq = 5.5
- Solution should turn milky by 2nd cycle; be sure to sonicate all over the sample but particularly at the liq/vap boundary.
- Pour latex glove finger contents into 2 ml tube.
- Immediately take a sample, and characterize droplet size distribution and concentration.
- Dilute 1:5 with degassed surfactant solution.
- Inject 100 microleters of diluted md solution into one side of the hemocytometer.
- Inject 100 microleters of di water into the other side of the hemocytometer.
- Use the arc lamp and the 40X objective on the microscope (allow the arc lamp to warm up for about 10 min before use).
- Start the computer and open the Nikon camera software, Camera Control Pro.
- Set camera setting: Sutter Speed = 1/400 sec, Exposure Compensation = +4/3EV.
- Click Tools and then Download Options.
- Create an appropriate folder:
- Folder name: (each attribute separated by underscore)
- Experiment Date: ed=mm-dd-yy
- Sample Origin Date: so=mm-dd-yy
- Experiment type: ex=x (where x is P for pressure and/or T for temperature and/or t for time with no spaces)
- Operator: op=x (x is P for Praveena and T for Tony)
- MB Concentration: mc=x (where x is the fraction of concentration from original)
- Surfactant type: st=x (x is pg for peg-plla and ct for ctab)
- Surfactant concentration: sc=x (x in g/ml)
- PFP concentration: pc=x (x in ml/ml)
- Example folder: ed=01-01-10_so=12-30-09_ex=Pt_op=T_mc=0.5_st=pg_sc=0.25_pc=0.02
- Input an appropriate file name:
- Pressure: P=x (where x is pressure in guage inHg)
- Temperature: T=x (where x is temperature in C)
- Focus: F=x (where x is d for focus on droplets, and b for focus on bubbles)
- Filename ends in number assigned by camera software (time will be taken from file data)
- example file: P=-10_T=25_F=b.jpg
- Focuse the microscope so that the droplets are in sharp focus and take at least 10 images.
- Take 2 or 3 images of the DI water to be used as control images to subtract out lens imperfections (These file names should begin with CONTROL).
- Run the matlab program md_datasets and then md_analysis to get droplet concentration and size distribution.