evolution of nrl materials research on lipid tubules tubules discovered at nrl darpa program metal...
TRANSCRIPT
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Evolution of NRL Materials Research on Lipid Tubules
Tubules discovered at NRLDARPA ProgramMetal Clad Tubules
Field Emitting CathodesControlled Release Demos
1983-1990
1991
1994
1996 lipid wall thickness control demonstrated
March 1997 - RAM-PatentApplication6.2 NRL funding for Tubule
based RAM 1996-2000
FY04Transition to Navy SystemsNULKA...
RTP, Biocompatibles CRADA’s for controlledrelease
FY98Fabrication of prototype RAM
Chiral Models developed
CD Experiments Start
NRL Base funding for Tubules starts
Tubule-based dielectric composites (ONT)
6.2 ONR funding for Antenna Isolation 1998-2003
NULKA isolation spec met, JULY ‘00
Successful captive flight testFlorida, April ‘02
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Tubule108 - 109 Molecules
Lipid Bilayer
DC8,9PC
Diacetylenic Phospholipids Synthetic phospholipids with photopolymerizable
diacetylenic moieties in their acyl chainsObserved to self-assemble into hollow, cylindrial structures = tubules
P. Yager and P. E. Schoen, Mol. Cryst. Liq. Cryst. 106, 371 (1984)
J. Schnur, Science, 262, 1669 (1993)
1 m
diameter ~ 0.5 mlength ~ 10 - 100 m
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Approach: High Aspect Ratio Microtubules
Bio-derived tubules: 0.5 micron diam. x 10’s micron length High conductivity electroless copper coating Small dimensions vs RF wavelength yield high dielectrics
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Release from Lipid Based Tubules
• Larger diameter (0.5u)• Aspect Ratio 10-200• Lipid or Metal Coated• Some control of structure
possible• Rational control of release
demonstrated• may be utilized in multi-purpose
coatings • May be used to entrap
– nanoparticles– higher molecular weight polymers
• Demonstrated effectiveness over 1 year in field conditions
• Subject of 2 CRADA agreements
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Artificial Dielectric Panels
Random dispersion of microscopic metal rods in
polymer
Bioderived microtubules: small size leads to broad
bandwidth
Per
mitt
ivity
Volume loading
real
imaginary
Lossy at low loadingsLightweight composites
Permittivity nonlinear with loading density
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Surface Wave
RF propagation schematic: antenna coupling
Gain limited by feedback
Receive Send
Test fixture (decoy)
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Light weight panels longer dwell-time increased payload
Tested and accepted by Sippican Inc.
Successful Captive-Carry test in Florida, April 2002
NULKA Decoy