This document discusses self-healing materials. Researchers at Penn State University developed a biodegradable liquid made of yeast and bacteria that allows torn fabric to reattach itself when the liquid is applied and the edges are pressed together. Another self-healing material discussed is Nano Cure Technology nylon ripstop, which can repair small holes and punctures using a special coating and the heat from fingers. Most self-healing materials contain microcapsules filled with glue that repair cracks when the capsules break open.

1. This Photo by Unknown Author is licensed under CC BY

2. 1.Outcome of researchers
of Pennysylvania State
University.
2. A biodegradable liquid
material(mixture of yeast
and bacteria) that allows
torn fabric to bind to itself
back together, sans
needles.
3. First, drop a tiny
amount of the liquid on
the tear. Then, apply warm
water; and lastly, press the
edges together for about
a minute – and, voila! The
torn fabric reattaches and
self-repairs.

3. Nano Cure Technology
• NCT is a
lightweight, water
resistant nylon ripstop
with resealing and
repairing capabilities.
Naturally, nylon ripstop is
extremely durable, but
when combined with the
special double sided
coating and the heat of
your fingers, small holes
and punctures can be
repaired.

4. • The best-known self-healing materials
have built-in microcapsules
(tiny embedded pockets) filled with
a glue-like chemical that can repair
damage.
• If the material cracks inside,
the capsules break open, the repair
material "wicks" out, and the
crack seals up.

5. • This utilizes a tri-layered structure,
front and back layers sandwiching a
viscous, reactive liquid middle layer.
• Self-healing in the front and back
layers occurs when the puncture
event creates a melt state in the
polymer materials and the materials
melt elasticity snaps back and closes
the hole.
• The viscous middle layer augments
the self-healing properties of the
other layers by flowing into the gap
created by puncture and concurrently
solidifying due to the presence of
oxygen.

6. Benefits
• Self-healing capability over a wide range of
temperatures.
• Rapid self-healing from high-velocity events.
• Lesser accidents.
• Long term solution for various things.
Applications
• Aircraft & Aerospace
• MMOD protective liners in space habitats/structures
• Radiation Shielding
• Encasing for fuel lines / tanks
• Encasing for hydraulics
• Wire insulation material
• Any pressure loaded type structures