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G Love

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

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G Love

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  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

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