Microfabrication & Printed Bio-Electronics
Micro-Contact Printing (µCP) PDMS Stamp Calculator
Model roof collapse sagging limits, lateral pairing buckling, and compressive feature barrelling for high-resolution PDMS micro-contact printing stamps.
1. Input Parameters
Width of raised micro-contact printing stamping post or line.
Edge-to-edge gap between adjacent stamping structures.
SU-8 master photoresist mold depth / PDMS relief height.
Applied mechanical pressure during conformal substrate contact.
2. Calculation Results
Aspect Ratio (w/h)
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Roof Collapse Safety
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Lateral Buckling Risk
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Printed Line Spread (Δw)
-- nm
3. Dynamic Visualizer & CAM Preview
4. Engineering Notes & Physics Specifications
Soft Lithography & Micro-Contact Printing ($\mu$CP) Mechanics: $\mu$CP utilizes elastomeric polydimethylsiloxane (PDMS) stamps to transfer self-assembled monolayers (SAMs, e.g., alkanethiols on gold) or functional bio-inks onto planar and curved substrates with sub-micron spatial resolution.
Instability Limits:
- Roof Collapse (Sagging): Occurs when wide spans between features sag under surface energy $\gamma$ and pressure $P$: $$s_{crit} = \left( rac{2 C E h^3}{\gamma (1 - u^2)} ight)^{1/4}$$
- Lateral Collapse (Pairing): Occurs when tall, slender pillars buckle and adhere laterally under capillary and van der Waals forces ($w/h < 0.5$).
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