anodic aluminum oxide(aao)
Post on 16-Mar-2016
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Anodic Aluminum Oxide(AAO)Anodic Aluminum Oxide(AAO)
chiller
Hot plate & Magnetic Spinner power supply
▲ ▲ FE SEM IMAGEFE SEM IMAGE
200 nm
500 nm
▲ hexagonal pore array
-. Naturally hexagonal ordered-structure with nano-scale pores.-. Naturally hexagonal ordered-structure with nano-scale pores.
-. Simple process, low cost, various applications-. Simple process, low cost, various applications
-. Various nano-structured material : nano-tube/wire/particle-. Various nano-structured material : nano-tube/wire/particle
-. Electronic device, optical device, bio-technology-. Electronic device, optical device, bio-technology
-. Template, data storage, mask pattern..-. Template, data storage, mask pattern..
☞ What’s the AAO?
☞ Application of AAO?
Fabrication of Anodic Aluminum Oxide(AAO)Fabrication of Anodic Aluminum Oxide(AAO)
ㆍ 1st Anodizationㆍ Electro-polishing
99.999% Al sheet: Degreasing
ㆍ 2nd Anodization
ㆍ Etching
ㆍ Pore widening
500nm
500nm
200nm
500nm
200nm
500 nm
500 nm
Description of StentDescription of Stent
-. Stainless steel wire mesh tube for blood vessel frame.(Medical treatment for artery disease)
-. Injection of stent with balloon for blood vessel expanding into the main artery
18.2mm(L) 5mm(L)23.2mm(L)
[ASTM F.562]
1.8mm(φ)
Stent
☞ What is a “Stent”? and How is a one used?What is a “Stent”? and How is a one used?
Issues and formation of drug storage space on StentIssues and formation of drug storage space on Stent
-. Re-closure-. Re-closure : : restenosis rates are 20% to 40% at 6 months.
-. Restenosis is a serious problem – Solution : drug-eluting stentSolution : drug-eluting stent.
Drug-eluting stents are coated with drugs that are slowly released and help keep the bloo
d vessel from reclosing
< Motivation >< Motivation >Need a drug storage space of nano-scale !!Need a drug storage space of nano-scale !!
StentStent
AAO + StentAAO + Stent
AAOAAO
SUS 316LSUS 316L SUS 316LSUS 316L SUS 316LSUS 316L
Formation of drug storage space on StentFormation of drug storage space on Stent
Stainless steel wireStainless steel wire Al deposition by evaporatorAl deposition by evaporator
AluminuAluminumm
Anodic oxidation Anodic oxidation
AAOAAO
☞ ☞ Issue in StentIssue in Stent
Fabricated AAO porous structure on Al sheet/StentFabricated AAO porous structure on Al sheet/Stent
Porous structure for drug Porous structure for drug loading and release testloading and release test
on high purity aluminum sheeton high purity aluminum sheet
AAOAAO
StentStent
Over-etched plane view
100㎛1㎛
Pore size: 30nm≒Pore depth 150nm≒
0min
9nm
15min
18nm
30min
32nm
45min
40nm
60min (Pore widening time)
58nm (Pore size)
Pore density : 2.44×1014ea/m2
Electro-polishingElectro-polishing
Anodic oxidationAnodic oxidation
Pore wideningPore widening
AAO formationAAO formation
Stent
AAO
Experimental proceduresExperimental procedures
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