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It can incorporate into multifunctional nanobiomaterials matrix
to make novel products
used in emerging biomedical and chemical applications
Photopatternable Multifunctional Nanobiomaterials
Nanocomposite Material for Bioelectrical Sensing
Hydrogel Material for Nanoassembly
We are talking about
2D micropatternable nanobiomaterials
Miniature Biochemical Sensors
Medical Diagnostic Microdevices
Engineered Cellular Microenvirements
MIR VAHID AHMADIPOUR
Yrd.Doç.Dr. SEBAHATTİN YENAL VANGÖLÜ
Photopatternable Conductive PDMS Nanocomposite
Photopatternable PEG Hydrogel Material for Nanoassembly
Photopatternable Superhydrophobic PTFE Nanocomposites
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
Photo patternable conductive PDMS
Make a micromachined mold
or spin coating
of PDMS plus photoinitiator
Adding highly conductive fillers into the polymer matrix
Excellent electrical and Thermal conductivity
Deagress for 15 min.
onto a glass, silicone , polymer
for 30 sec.
wafer loaded toward
UV exposure 12 mW/cm^2
for 10 min.
UV post exposure
for 50sec. at 120 C.deg.
Remove the uncured PDMS with toluene
wafer rinsed in 2-Propanol
blow dried with Nitrogen
Properties of PDMS-AG
due to cross linked silver particles
Silver make the PDMS more
from contact degree
of 109 to 131
Silver as antibacterial
for medical applications
Poly(ethylene glycol) is a polymer found commonly in many household products, such as toothpaste.
automotive antifreeze !
In nano size, we can use it for
functional micropatterns for biochips
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:
angle of substrate
size of PEG nanopattern
Influence of Surface Property of
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:
Due to its chemical inertness and high melting temp.
its difficult to process it through conventional microfabrication
How to reach it?
Chemical inertness of material
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 Polymer matrix such as SU-8
PTFE-SU-8 nanocomposite pattern
unique combination of
Superhydrophobicity and Photopatternability
excellent adaptable and processable
water contact angle at 150 deg.
Application in Bionics