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Untitled Prezi

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by

Mir vahid Ahmadipour

on 6 June 2014

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Transcript of Untitled Prezi

Future Perspective
of phottopaternability
It can incorporate into multifunctional nanobiomaterials matrix
to make novel products
used in emerging biomedical and chemical applications
Introduction
Photopatternable Multifunctional Nanobiomaterials
Photopatternable Conductive
PDMS
Nanocomposite Material for Bioelectrical Sensing
What is
Polydimethylsiloxane
?
Photopatternable
PEG
Hydrogel Material for Nanoassembly
What is
Polydimethylsiloxane
?
Photopatterable PDMS
Photopatternable Superhedrophobic
PTEF
Nanocomposite
What is
Polytetrafluoroethylene
?
Introduction
We are talking about
2D micropatternable nanobiomaterials
with desired
BULK
and
SURFACE PROPERTIES
Miniature Biochemical Sensors

Medical Diagnostic Microdevices

Engineered Cellular Microenvirements
By:
MIR VAHID AHMADIPOUR

Course Lecturer:
Yrd.Doç.Dr. SEBAHATTİN YENAL VANGÖLÜ

Photopatternable Conductive PDMS Nanocomposite
Photopatternable PEG Hydrogel Material for Nanoassembly
Photopatternable Superhydrophobic PTFE Nanocomposites
Topics
Photopatternability + Desired physical and chemical properties to be used in :
Researcher Zhenan Bao, chemistry professor at Stanford, and her team “used organic electronics – with PDMS to make their electric skin, which is 1,000 times more sensitive than human skin
an super-elastic and nontoxic polymer
that can be use in MEMS specially for biological and medical applications
But it has high electrical impedance and poor adhesion with evaporated metal
Conductive PDMS
Photo patternable conductive PDMS
1-
Make a micromachined mold
or spin coating
of PDMS plus photoinitiator


2-
Film baking


3-
UV exposure
Adding highly conductive fillers into the polymer matrix
Excellent electrical and Thermal conductivity
Deagress for 15 min.
PDMS
Silver Powder
Fabrication
Sylgard 184
Benzephenone
Spin coat
onto a glass, silicone , polymer
for 30 sec.
wafer loaded toward
photomask
UV exposure 12 mW/cm^2
for 10 min.
7200mJ/cm^2
UV post exposure
and
bake
for 50sec. at 120 C.deg.
Remove the uncured PDMS with toluene
and
wafer rinsed in 2-Propanol
and
blow dried with Nitrogen
PDMS-Ag
Electrical
Mechanical
Chemical
Biological
Properties of PDMS-AG
more conductive
Mechanical strength
improves
due to cross linked silver particles
Silver make the PDMS more
Hydrophobic
from contact degree
of 109 to 131
Silver as antibacterial
for medical applications
and anti-infection
Application in
Bioelectrical Sensing
Poly(ethylene glycol) is a polymer found commonly in many household products, such as toothpaste.
PEG
Polyethylene oxide
Water
automotive antifreeze !
Nonfouling Biomaterial
Nonahdesive
In nano size, we can use it for
functional micropatterns for biochips
PEG-DA
+
Photoinitiator
+
other addetives
Coating
and
UV exposure
dissolve unexposed areas
with DI water
Fabrication of Photosensitive prepolymer called
Polyethylene glycol diacrylate (PEG-DA)
PEG Pattern-Assisted Nanoassembly
Number of nanocolloids in arrays, depends on:
The Gravity
Pull speed
angle of substrate
size of PEG nanopattern
Influence of Surface Property of
PEG
To prevent the PSMA nanocolloid from adhering to the surface of PEG, We treat about 100 nm of PEG with oxygen plasma.
plasma makes PEG antifouling.
Application in Biosensing
other Molecules can couple with PSMA to make a:

Antigen/Antibody

Biomolecule

fluorescent agent
Teflon
Chemically nonreactive
Almost insoluble
Nonsticky coating
Nonfouling property
Flexibility
Biocompatibility
But
Due to its chemical inertness and high melting temp.
its difficult to process it through conventional microfabrication
Superhydrophobic
PTFE
Photopatternable
PTFE
How to reach it?
Chemical inertness of material
Physical roughness

Hydrophobicity of PTFE is 1
Due to hurdle chemical & physical properties of PTFE,
to microfabricate, we mix it with another polymeric and photopatternable PTFE :

Photosensitive PTFE
20wt%
into a
Photosensitive Polymer matrix such as SU-8
mix together
spin-coat
UV
Cross-linked
PTFE-SU-8 nanocomposite pattern
Properties
unique combination of
Superhydrophobicity and Photopatternability
excellent adaptable and processable
water contact angle at 150 deg.
Application in Bionics
Full transcript