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Anodic Aluminum Oxide(AAO) Anodic Aluminum Oxide(AAO) chiller Hot plate & Magnetic Spinner power supply FE SEM IMAGE FE SEM IMAGE 200 nm 500 nm hexagonal pore array -. Naturally hexagonal ordered-structure w -. Naturally hexagonal ordered-structure w ith nano-scale pores. ith nano-scale pores. -. Simple process, low cost, various appli -. Simple process, low cost, various appli cations cations -. Various nano-structured material : nano- -. Various nano-structured material : nano- tube/wire/particle tube/wire/particle -. Electronic device, optical device, bio- -. Electronic device, optical device, bio- technology technology -. Template, data storage, mask pattern.. -. Template, data storage, mask pattern.. What’s the AAO? Application of AAO?

Anodic Aluminum Oxide(AAO)

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power supply. chiller. Hot plate & Magnetic Spinner. Anodic Aluminum Oxide(AAO). ☞ What’s the AAO?. -. Naturally hexagonal ordered-structure with nano-scale pores. -. Simple process, low cost, various applications -. Various nano-structured material : nano-tube/wire/particle - PowerPoint PPT Presentation

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Page 1: Anodic Aluminum Oxide(AAO)

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?

Page 2: Anodic Aluminum Oxide(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

Page 3: Anodic Aluminum Oxide(AAO)

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?

Page 4: Anodic Aluminum Oxide(AAO)

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

Page 5: Anodic Aluminum Oxide(AAO)

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