This video by the Royal Society of Chemistry explains how a UV/vis spectrometer works and the principles behind it. It demonstrates the creation of a spectrum corresponding to a soultion, a process that was used numerous times when testing hydrogels in these experiments.
Lab Videos:
May
4th 2017 - This is a second clip that was taken during our visit to the
lab on April 30th, 2017. Glen is demonstrating the step of
transporting (with a pipette) the mixture of sodium alginate and
methylene blue from one of the heated beakers to the beaker containing
calcium chloride. Once a drop lands in the calcium chloride, a hydrogel
bead is formed.
May
4th, 2017 - This is a clip that was taken during our visit to the lab
on April 30th, 2017. It shows the process of heating up and mixing the
contents (a specific measurement of methylene blue and sodium alginate)
of the beaker. This step was necessary because the sodium alginate
proved to be difficult to dissolve when simply mixing by hand. Once all
of the sodium alginate dissolved, the beaker was removed and replaced by
another beaker of different measurements.