User:Alicia Rasines Mazo/Notebook/CHEM-582 Experimental Chemistry II/2015/02/27

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Tasks for February 27

  • To carry out adhesive strength test
  • To carry out thermal conductivity test with aluminium dish alone and aluminium with epoxy coating
  • Antibacterial testing

Adhesive strength test

  • T plates cured with epoxy were clamped to PASCO materials testing machine (max. force 7100 N)
    • It was not possible to calculate the force required to pull out the T plates apart due to instrumental design limitations. T plates kept sliding out; after drilling inserts to hold them in place, it turned out that the aluminium stretched. See photo below:

Aluminium tplate.png

  • An alternative weight test was then carried out. 5, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90 and 100 lb were hung for 2 min. The T-plates did not dettach though we managed to bend the aluminium.
    • A further test will be carried out next week with long nails in order to exert more torque.


Thermal Conductivity Test

  • The thermal conductivity test was carried out by Tami.

A few adjustments were carried out in order to minimize heat losses:

  1. The experiment was set up on the bench instead of the hood to prevent airflow
  2. A large tray was set up next to the hotplate to stop air flow from the AC unit
  • 30 ml of water was measured out to make sure each experiment was consistent and prevent boil over
  • The experiment was measured every ten minutes for one hour, because it was noticed that the temperature becomes stable after 20 minutes
  • Table 1.Thermal conductivity study of aluminium dish

Blank tes 2.png

  • Table 2. Thermal conductivity study of the dish with epoxy coating

Epoxy tes.png

  • After the test was completed the dish with epoxy coating was allowed to cool and dry. The epoxy was removed for the dish and cut in half, thickness was measured using a caliper in the middle of each half and averaged. The epoxy coating thickness was 1.91mm

Antibacterial Testing

As described by Andrew the following steps were taken:

  • Collect cells from films with a gauze patches
    • make sure to clean all tools used with ethanol, and heat if possible
  • Place gauze patch in 10mL of the saline solution in a test tube
  • Vortex test tubes
  • Pipette 50 micro-liter on agar plates
  • Spread out the cells with the triangular glass spreading tool
  • Prepare four plates in total
  • Incubate at 37C for 24 hours