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Can You Heat Me Now?

Can You Heat Me Now?. Brie Frame Sandra Gonzalez Angela Tong Chenny Zhu. Department of Materials Science • 3.082 • Advisor: Hao Wang • March 4, 2004. Outline of Presentation. Objective Updated Design Potential Materials Proposed Schedule. Objective.

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Can You Heat Me Now?

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  1. Can You Heat Me Now? Brie Frame Sandra Gonzalez Angela Tong Chenny Zhu Department of Materials Science • 3.082 • Advisor: Hao Wang • March 4, 2004

  2. Outline of Presentation • Objective • Updated Design • Potential Materials • Proposed Schedule

  3. Objective • Design and fabricate a heat therapy device for lower back pain with a future use for transdermal drug delivery.

  4. Single Component vs. Hybrid

  5. Components of Device Battery High Insulating Layer Heating Core Outer Covering Body

  6. Device Placement Heating Device Battery

  7. Heating Core • Potential Materials • Tetradecanol • Ethylene Carbonate • 2,6-Di-tert-butylphenol • Cis-Cyclohexane-1,2-dicarboylic anydride • Benzylideneacetone • Sodium Acetate

  8. Insulating Material Potential Materials • COHRlastic Solid Silicone Rubber • Thermally Conductive R10404 • Low Thermal Conductivity 0.0037W/mK • Very Thin • R10480 • Low Thermal Conductivity • Flexible • Cotton • Low Thermal Conductivity 0.03 W/mK • Neoprene • Insulwrap Quilts from American Acoustical Products

  9. Battery • Sanyo Batteries • Lithium Polymer: UPF574199 • high energy density both by volume and by weight, flat and flexible • not as much total energy available per battery • Li-ion Rechargeable: UR18650H, UR18650F • highest energy densities of the fifteen batteries surveyed • less total energy than lithium polymer, round casing • Saft Batteries • Li-ion Rechargeable: MP176065 and others • highest total energy available per battery, flat casing • big and bulky, rigid casing, low energy density

  10. Switch • Potential Switches • Polymer Thermal Switch • Polymer matrix with conductive particles interspersed • When cooled, matrix becomes compact, particles touch and form electrically connected network • When heated, matrix expands, connected network breaks • Bi-metallic Switch • Two metals with different expansion coefficients laminated together • When heated, one expands more than the other, which causes it to bend and either open or close the circuit • Integrated Circuit – Programmable Thermostatic Switch • Circuit where temperature setting can be controlled by adding resistors

  11. Wire Tensile Testing • Ni80Cr20 • Ni60Cr40 • High Resistance • Strong • Cross-sectional area = 1.26x10-3 sq. in.

  12. Wire Tensile Results for Ni60-Cr40 Ultimate force withstood: 135 pounds Ultimate Tensile Strength (UTS): 107,432 psi Elastic Modulus= (61,674-15,915) psi / (.1388-.1042) = 1,322.5 ksi Total Elongation=1.9 in.

  13. Wire Tensile Results for Ni80-Cr20 Ultimate force withstood: 160 pounds Ultimate Tensile Strength (UTS): 127,300 psi Total Elongation=2.6 in.

  14. Proposed Schedule

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