1 / 12

G Love

Learn about the fabrication process and thermal analysis of PLGA microspheres using paraffin and octadecane as phase change materials. Explore techniques such as SEM imaging and DSC analysis for evaluation. Discover the potential applications in heat transfer technologies.

doraj
Download Presentation

G Love

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. G Love Kristin Brodie Jeff Colton Colin Galbraith Bushra Makiya Tiffany Santos

  2. Fabrication of Microspheres • Used protocol learned at beginning of semester to fabricate PLGA microspheres • Homogenizer speed: • Paraffin: 3.5, 5 • Octadecane: 4, 5 • Pipette used to separate water and paraffin • Filter used for octadecane (0.22m)

  3. SEM of Microspheres • Paraffin Wax • Homogenizer speed 5 • Average size: 150m • Range: 50 – 300m

  4. SEM of Microspheres (2) • Paraffin Wax • Homogenizer speed 3.5 • Average size: 200m • Range: 50 – 400m

  5. DSC for Octadecane and PEG • Octadecane • PEG

  6. Heat Flow Model for a Finger • Finger assumed to be a cylinder • Power = 2rLq = 2L(T1-T3)/R • R = Fabric Resistance + BL Resistance • FR = 1/kc * ln (rc/rw) • BLR = 1/(rc*h) • h = 1.22*(T/D)^(1/4) for a horizontal pipe • Approximating values: • h~10 W/m2K • Power~2.5 W • A hand can be assumed to be a cylinder • rhand = 2*rfinger

  7. Heat Transfer Through Gloves • Heating element in the glove (73cm) • Thermistor in and out of the glove • Power: 3.6V • Current: 0.55A • Weight to reduce air flow into glove

  8. I*V/A = h (T[in] – T[out]) I = 0.55A V = 3.6V A = 0.05m2 T[in] = 317.42K T[out] = 294.98K h = 1.765 W/m2K Heat Flow Results

  9. Data for Heating Element Wires

  10. Curve for Ni:Cr 80:20wt%

  11. Results • Ni:Cr 80:20wt% chosen for large elastic region • Octadecane preferred over PEG for Heat of crystallization properties • Experimental thermal coefficient is similar to theoretical value

  12. What Will We Do Next? • Phase Change Material • Test integrity of PVA • Fabricate microspheres of PEG • Incorporation of phase change material into fabric • DSC of microspheres • Heating Elements • Test battery with Prof Ceder • Incorporation of thermal switch • Choose a fabric to get specific thermal properties

More Related