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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Bio-Nano/Micro Fluidic Systems
Prof. Fan-Gang TsengNational Tsing Hua University
Engineering and System Science Dept.
Part A Micro Fluidic Physics
Part B Bio-sample preparation
Part C Operation of Micro Fluidic Systems-Continuous and Digital Fluidic Systems
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Part A Micro Fluidic Physics
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
outline
1.scaling law of micro/nano fluidics2. Sample collection3. Sample preparation4. Sample transportation/treatment
a. Continuous flow systemb. Digital flow system
5. examples
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Scaling law of micro/nano fluidics
• Microfluidics
Navier-Stokes Eq., Reynolds number, Peclet’s number, Capillary number, Knudsen’s number, Froude’s number
• Surface related phenomena
Diffusion, surface tension force
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Scaling with length scale
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Dimensional and Dimensionless
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Microfluidics
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
uρCpL/k
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Part B Bio-sample preparation
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Sample collection
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
120 µm
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Sample Preparation
• extraction• purification• separation• amplification• sorting
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Capillary Electrophoresis
D. N. Heiger, High Performance Capillary Electrophoresis - An Introduction, Hewlett-Packard Co.
Electrokinetic phenomena: electrophoresis and electro-osmosisP flow EOF
0 ms
60 ms
150 ms
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
P DEP N DEP
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
(magnetic beads)
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Part C Operation of Micro Fluidic Systems
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
• Digital Fluidic Systems1. droplet generation2. droplet suspension3. droplet surface manipulation
Micro Fluidic Systems:
EWOD, CJ Kim, UCLAµTransducers sourcebook, 98
• Continuous Fluidic Systems1. micro channel2. mixing/reaction,3. flow logic, 4. flow detection5. fluid actuation (pump, valve)6. integration and package
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
• Reagent: storage, reconstitution, sample volume• fluidic device: fabrication,micro flow
measurement, and characterization• Surface modification•Integration• Package: interconnects, filling/bubbles/ dead
volume, leakage• control algorithms, data processing,
and communicaiton• Power consumption/ effeciency• Passive or active• reusable or disposable
Challenges for Continuous Micro/nano fluidic system
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
One example of Continuous Micro/nano fluidic system
Abe Lee, 2003
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 57: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/57.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Flow channels1. Mixers 2. Extractors3. Flow logics
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Flow channelsBulk micromachining Surface micromachining
Buried micro channels Polymer micro channelsµTransducers sourcebook, 98 µTransducers sourcebook, 98
µTransducers sourcebook, 98
Anti-reflection coating
SU-8
SubstrateStandard UV exposure
Partial UV exposure
(a)
(b)
(c)
Anti-reflection coating
Stacked channel
Channel release
(d)
(e)
(f)Chuang, Tseng, MEMS’02
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
MixersSharp turn Flow lamination
Plume mixers Active mixers
µTransducers sourcebook, 98
µTransducers sourcebook, 98
µTransducers sourcebook, 98
CHAOTIC MICRO-MIXER
H. Suzuki, C.-M. Ho, MEMS 02
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Separation
µTransducers sourcebook, 98
Electrophoresis Extractors
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Flow logics
Flow rectifier
Coanda effect Flow oscillator
µTransducers sourcebook, 98
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Fluidic sensors
1. Flow sensors2. Viscosity/density
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Flow sensorsThermal flow sensors
Cantilever drag flow sensor Lift force flow sensorCaltech, UCLA
µTransducers sourcebook, 98
C. Lin, F. G. Tseng, Sensors J. 2002
Fiber Floating Element
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Viscosity/density sensors
Acoustic Wave Sensors, 97
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Thermal/Fluidic actuators
1. Valves
2. Pumps
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 67: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/67.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 68: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/68.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Micro valve
![Page 69: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/69.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
ValvesCheck valves Active valves
(thermal pneumatic)
µTransducers sourcebook, 98
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 71: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/71.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 72: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/72.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 73: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/73.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 74: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/74.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 75: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/75.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 76: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/76.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 77: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/77.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
![Page 78: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/78.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Actuation Mechanisms for Microvalves
• Pneumatic-Large linear forces-Requires external force generation ad external interconnections
• Thermal Expansion-Larger linear forces-Relatively slow, may heat fluid, consume large amounts of power
• Peizolelectric-Very Large forces-Very small movements, large voltages
C. Rich and K. Wise, Proc. MEMS’99, 130-134
C. Grosiean et al, Proc. MEMS’99, 147-152
S. Shoji et al, Transducers 91, 1052-1055
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
M.Huff etal, Transducers’93, 88-101
K. Yanagisawa et al, Transcucers’93, 102-105
• Electrostatic
-High but nonlinear forces, large movements
-requires high voltages
• Electromagnetic
-Large forces and movement, very fast, low power
-Complex fabrication process/difficult to integrate
• Shape Memory Alloy (SMA)
-Very large force
-Slow response, need heat upCarien & Mastrangelo, MEMS-00
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Carien & Mastrangelo, MEMS-00
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Micro pump (with or w/o moving part)
![Page 82: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/82.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
(Ion drag)
(concentration difference)(suction force by high velocity/low pressure)
![Page 83: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/83.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Pressure driven pumpMembrane Pump
Rotary Pump
G. Kovacs, Micromachined Transducers Sourcebook, 1998
Diffuser Pump
G. Kovacs, Micromachined Transducers Sourcebook, 1998
G. Kovacs, Micromachined Transducers Sourcebook, 1998
Ultrasonic Pump
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Electro driven pump (ion drag)Electroosmotic Pump EHD Pump
MHD PumpCapillary Electrophoresis by Electroosmosis pumping
H. Chujo et al., MEMS’03
Lorentz Force pumps fluidF=I×B
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Filters
![Page 86: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/86.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Filters
µTransducers sourcebook, 98
Horizontal
Vertical
H. Sato et.al., MEMS’03
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Flow systems
1. Interconnects
2. Packaging and integration
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Interconnects
Single point Multi point
µTransducers sourcebook, 98
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Packaging and integration
Snap-together plastic package,injection mold, gluing sealing
Stacking method
µTransducers sourcebook, 98
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
類比微流體系統:
1.Biomedical Sensing System
3. Drug delivery
4. Gas/liquid chromatography
5. Micro Power Generator
![Page 91: Bio-Nano/Micro Fluidic Systems · 2019. 7. 22. · NTHU ESS µ-Nano Bio & fluidics System Lab Prof. Fan-Gang Tseng Bio-Nano/Micro Fluidic Systems Prof. Fan-Gang Tseng National Tsing](https://reader035.vdocuments.site/reader035/viewer/2022071513/61344a9cdfd10f4dd73ba308/html5/thumbnails/91.jpg)
NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Micro Total Analysis System (µTAS)or Lab on the chip (LOC)
i-STAT’s handheld clinical analyzer and disposable cartridge
Biologixs pH sensor cube and reader
Porton Diagnostic’s potassium sensor and reader
µTransducers sourcebook, 98
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Drug deliveryMicro needle array
needle+blood sensingASME IMECE’00MEMS’98 P. Griss and G. Stemme, µTAS’02
K. Oka et al., Transducers’01
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
微系統科技的應用研究舉例(Bio-MEMS)
Insulin pump (Debiotech, Switzerland)
µTransducers sourcebook, 98
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Gas/liquid chromatography
µTransducers sourcebook, 98
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Micro Power GeneratorMicro Fuel cellMicro battery
Bial Fuel cellDirect Methonal Fuel cell
Y. Seo and Y.-H. Cho, MEMS,03 M. Chiao, K. B. Lam, and L. Lin, MEMS,03K. B. Lee, F. Sammoura, and L. Lin, MEMS,03
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Digital Micro Fluidic Systems
1. droplet generation
2. droplet suspension
3. droplet surface manipulation
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Droplet generatorsHP
Sharp, Inc, MEMS 96
Epson
E.S. Kim, USC, MEMS98
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
液珠懸浮控制
(S. Nilsson, et. al., µTas’00)
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
微液珠平面驅動方式
•微液珠驅動方式:1. 靜電及電潤濕 [2-4] 2. 光驅動法 [5] 4. 固態液體珠 [6]5. 非對稱結構 [8]6. 熱毛細力 [9]7. 結合Marangoni效應, 熱毛細力, 凝結及成核 效應[7]
Most of them are employing surface tension gradient!!!
Lee. J, Sensors and Actuators 2002
K. Ichimura, Science, 2002
P. Ausslllous, Nature, 2001
O. Sandre, Physical Review E, 1999
J. C. Chen, Science, 2001
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Electrostatic
(Masao Washizu, IEEE 1998 ) (Altti Torkkeli, IEEE 2001 )
• Very high voltage, • electrolysis problem, • charged bio-molecules may be attracted by electrical field
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Electrowetting
(Sung Kwon Cho, IEEE 2002 )
EWOD (ElectroEetting on Dielectric)
CJ Kim, UCLA
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Moving
Creating
Separation
(Pei Yu Chiou, IEEE 2003)
OWE (Opto-Electrowetting)Electrowetting
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Photonic & SAMs
(K. Ichimura, Science 2000)
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
0306090120150180210
0 1 2 3 4 5Distance(mm)
Temperature(℃
) 30V-Xdirection
1mm
0 s
0.5 s
1 s
1.5 s
2 s
4 s
0 s
0.5 s
1 s
1.5 s
2 s
4 s
1 µl 0.1 µl
2 mm 2 mm
•Droplets Moving Behavior
2.17mm
1 µl0.1 µl
Marangoni Effect
Marangoni flow
Capillary flow
TH TL
Temperature distribution
F. G. Tseng et al, Transducer’03
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
(Susan Daniel, Science 2001)
Marangoni flow
Capillary flow
TH TL
Marangoni +capillary+ coalesces Effect
Droplet movement ~10 cm/s, 10 times faster
Hydrophilic Hydrophobic
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Surface Roughness
Wettability Switching by Surface Roghness Effect (Bo He, IEEE 2003 )
Winzelγsv
γlv
θ’γsl
Cassie
a b
Water
θγ
γγθ cos
)('cos rr
lv
slsv =−
=
1cos'cos −+= ff θθ
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Superhydrophobic & Gravity
Hydropphobic powder (20µm) coating (Pascale Aussillous, Nature 2001)
Water Droplet Weight 7mg with tilt angle of surface 1°˚ (Masashi Miwa, Langmuir 2000)
Liquid Marble (Powder coating)Superhydrophobic Surface (SAMs)
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
(a). Au on glass side+ SAMs
θ=110.7°˚Hydrophobic SAMs*
θ=56.7°˚Hydrophilic SAMs (-COOH)
(b) Au on micro posts
θ=109.9°˚dia: 60μm pitch:40μm
θ=73.8°˚dia:80μmPitch: 180μm
(c) Au on micro posts+SAMs
θ=143.6°˚Hydrophobic SAMs*dia: 60μm pitch:40μm
θ=12.4°˚Hydrophilic SAMs(-COOH)dia:80μmPitch: 180μm
Fan-Gang Tseng, and Shu Chun Chien, “Droplet Movement Induced by Nano Assembled Molecules And Micro Textures “ Nanotech2004
+
SAMs*: CH3(CH2)17SH
Combination of surface roughness and SAM
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Comparasion
Principle Max. Velocity(mm/s)
Droplet Size(µl) Power
Electrstatic(Altti Torkkeli, IEEE 2001) 10 2 ~ 50 Yes(124VAC)
Electrowetting(S. K. Cho, IEEE 2002) 250 1 Yes(100VAC)
Optic(K. Ichimura, Science 2000) 0.035 2 Yes
Temperature Gradient(Susan Daneil, Science 2001) ~ 20 0.001 ~ 1 Yes
Roughness(Bo He, IEEE 2003) ? 7 No
Gravity(P. Aussillous, Nature 2001) ? 1 ~ 10 No
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Digital fluidic systems:
1. Biomolecule Micro Array
2. Micro Droplet Systems
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Micro ArraysDNA Micro arrays
Chemically synthesize
Mechanically spot
DNA array system:Standford University, Brown group
Capillary
Tip
Bio-reagent
Glass slideUltrasound wash bath
Petri dishPrintingTip array
Translation stage
(Affymetrix,USA,from transducers source book)
• High throughput• Low volume• High speed screening
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Microdroplet Drug Releasing
Open connection channle
Droplet Volume
B. de Heij et al, MEMS’02
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Digital µTAS or LOC
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Continuous vs. Digital Fluidic system
Continuous digital
1. Components versitle single2. Device complexity complex simple3. fabrication difficult depends4. integratability difficult easier5. Flow sesing/control complex depends6. Flow resistance high low7. Dead volume high low8. reuse difficult possible9. System cost high depends10.Fluid flow enclosure (half)open11.evaporation low high
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NTHU ESS
Prof. Fan-Gang Tsengµ-Nano Bio & fluidics System Lab
Reference
1. G. T. A. Kovacs, “Micromachined Transducers Sourcebook”, McGraw-Hill, 1998
2. Abe Lee, lecture notes UCI-BME 295, 20033. Proceedings of Micro Total Analysis Systems,
98, 00-044. Proceedings of IEEE MEMS conference, 96,98,
02, 035. Proceedings of IEEE Transducers’01, 036. Proceedings of ASME IMECE MEMS, 98, 99,
00.