Presentation of the new SLIPS technology for sticky problems by Phil and Scot of Slips technologies

1. Slippery Solutions for Sticky ProblemsTM
www.slipstechnologies.com

2. ‘Sticky’ Problems!

3. Young (1805)
Wenzel (1936)
axter (1944)
γLVcos𝜃 = γSV − γLS
cos𝜃* = rcos𝜃
cos𝜃* = -1 + ɸs(cos𝜃 +1)
solid
vapor
liquid
𝜃
contact angle (CA): 𝜃
idea
text
we
text
non-w
chem

4. 𝜃R
𝜃A
α
contact angle hysteresis (CAH): 𝜃A - 𝜃R
γLV (cosθR – cosθA) = mg
Furmid
solid
𝜃R
𝜃A
α
θ ≤ θA ≤ θ + (180
Gibbs Inequalities:
𝜃
β
𝜃A
solidrough solid

5. r-Repellent, Self-Cleaning Surfaces in Nature
20µm
Planta 202 1-8 1997! Soft Matter 3

6. r-Repellent, Self-Cleaning Surfaces in Nature
20µm
Planta 202 1-8 1997! Soft Matter 3
Lessons learned from Nature:
• Often hierarchical structures
• Covered with hydrophobic materials
• High contact angles

7. low surface tension liquid
high temperature
high pressure ‘stickyon-sticky’

8. an we make the surface ‘slippery’?
rasmooth interface
sentially eliminates ‘pinning points’
n we (practically) do this with a solid material?
hat about using a ‘liquid’?
t how can we hold such liquid?
hat about using non-interacting, immiscible liquid (e.g.
E, silicone)?
f course, durability, scale-up, manufacturing, and cost ar
pressing issues

9. Tree 2(12) 364 – 369 (1987), PNAS 101 14138 – 1
Proc. R. Soc. B (2008), Plant Signaling & Behavior (2009), Prog. Na
nivorous Nepenthes Pitcher Plant

10. Tree 2(12) 364 – 369 (1987), PNAS 101 14138 – 1
Proc. R. Soc. B (2008), Plant Signaling & Behavior (2009), Prog. Na
Lessons learned from Nature:
• Immiscible liquid layer
• Chemical Affinity
• Capillarity
nivorous Nepenthes Pitcher Plant

11. Slippery Liquid-Infused Porous Surfaces
infuse with
a lubricant
liquid
being r
surface functionalization/
conditioning
g
self-healing and repellent!
lubricating film in and on a porous solid!
nanometer smoothness
llent repellency to almost everything
pressure/temperature tolerance
Features
Nature 477 443-447 2011!
ACS Nano 6(8) 6569-6577 2012!
PNAS 109(33) 13182-13187 2012!
PCCP 15 581-585 2013!
Nano Lett. 13(4) 1793-1799 2013!
Nature Materials 12 529-534 2013!
Appl. Phys. Lett. 102 231603 2013!

12. esign Principle: Modeling the Film Stability

13. Teflon vs. Superhydrophobic vs. SLIPS

14. Stable up to 250°C and ~700 atm (10,000 psi)
mperature Resistance Self-healing

15. atic culture)

16. inosa in media is
d through PTFE
IPS PTFE tubing
hour growth
mL/min flow
der flow)

17. Yet another approach to create ‘liquid interface

18. SLIPS vs. Biofouling (Lab Test)
Chlamydomonas reinhardtii algal biofilm, 2 weeks culture

19. R-SLIPS against Marine Biofouling (Field Test)

20. Slippery Solutions for Sticky ProblemsTM
www.slipstechnologies.com
Thank You!!