User:Matt Hartings/Notebook/AU Biomaterials Design Lab/2014/09/12

Biomaterials Design Lab

Main project page Previous entry      Next entry

Objective Start preparing new films using exfoliated clay. Perform XRD measurement. Continue analysis of DSC and UVVis. Description Exfoliated Clays An exfoliated clay has had all of its layers separated from one another. Instead of having layers in water, you have single sheets of material. This should change the absorption properties of the clay. We are going to test PVA-exfoliated clay materials against the regular PVA-clay material. To exfoliate clay, you stir it in water for 24 hours. (Luckily Dr. Fox has done this for us already). Stock solution 4% sodium montmorillonite Determine how to make a film such that you make a 10% clay (1g of PVA, ?? of exfoliated clay solution). Prepare a crosslinked film with the exfoliated clay in a similar manner to your other films Powder Xray diffraction We will discuss X-ray diffraction You will dry and set up your samples for use in the xrd instrument. I will show everyone how to use the instrument Continue DSC analysis Continue UVVis Analysis We all need to have a discussion about what our possible sources of error are. We may need to set up new malachite green/PVA-film experiment (just the PVA, not PVA clay at this point) Data PVA - malachite green absorption Mass of empty vials and lids 2ppm sample: 16.3644g 8ppm sample: 16.2305g 20ppm sample: 16.4321g 200ppm sample: 16.2265g Mass of vials and lids and film 2ppm sample: 16.4251g 8ppm sample: 16.3305g 20ppm sample: 16.5610g 200ppm sample: 16.3400g Mass of film 2ppm sample: 0.0607g 8ppm sample: 0.1000g 20ppm sample: 0.1289g 200ppm sample: 0.1135g Malachite Green Stocks mass: 0.0195g volume: 100mL concentration in ppm: 195ppm concentration in M: 5.34x10-4 80ppm (80ppm)(25mL)=(195ppm)V V = 10.256mL 20ppm (20ppm)(25mL)=(80ppm)V V = 6.25mL 8ppm (8ppm)(25mL)=(80ppm)V V = 2.5mL 2ppm (2ppm)(25mL)=(20ppm)V V = 2.5mL Notes This area is for any observations or conclusions that you would like to note. Use categories like tags. Change the "Course" category to the one corresponding to your course. The "Miscellaneous" tag can be used for particular experiments, as instructed by your professor. Please be sure to change or delete this tag as required so that the categories remain well organized.