Tensiometer and Surfactant solutions

Since we are relatively trained on using the Tensiometer, we will prepare solutions of differing surface tensions by using a 5% stock solution of Dodecylsulfate, Sodium salt. By we, I mean Sabra since I really don't want to deal with a syringe, since I know how clumsy I am. Sabra prepared 0.03%, 0.06%, 0.09%, 0.12%, and 1% solutions

We then set up the tensiometer to determine the surface tension of the water/surfactant solution. We let it run for about an hour. We received a surface tension reading of 61.

After lunch was the Russell group weekly meeting. Dr. Russell set the sequence of presentations, then spoke with individual group members about their progress, expenditures, and references. He spoke with some of the newer PhD candidates about the upcoming cumes. First and second year PhD candidates must take exams (cumes) as part of their program. The exams are offered on the second Saturday of the even numbered months, and consist of six questions; two chemistry, two physics, and two engineering based. PhD students must answer four of the six questions at each session. The students must pass four Cumes in a row, or five total.