Pdms Wet Etching Process
Pdms Wet Etching Process - Related Videos
08:31
One-Step Approach to Fabricating Polydimethylsiloxane Microfluidic Channels of Different Geometric Sections by Sequential Wet Etching Processes
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Cited by 1 •
2018
Several methods are available for the fabrication of channels of non-rectangular sections embedded in polydimethylsiloxane microfluidic devices. Most of them involve multistep manufacturing and extensive alignment. In this paper, a one-step approach is reported for fabricating microfluidic channels of different geometric cross sections by polydimethylsiloxane sequential wet etching.
11:13
Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Cited by 1 •
2016
We propose a simple self-assembly technique of silica colloidal nanoparticles to create a nanofluidic junction between two microchannels in polydimethylsiloxane (PDMS). Using this technique, a nanoporous bead membrane with a pore size down to ~45 nm was built inside a microchannel and applied to electrokinetic preconcentration of DNA samples.
14:48
PDMS Device Fabrication and Surface Modification
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Cited by 5 •
2007
09:41
Stretching Micropatterned Cells on a PDMS Membrane
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Cited by 6 •
2014
This manuscript presents a technique to apply or release forces on adherent cells or tissues using unidirectional stretching.
06:56
Wet-spinning-based Molding Process of Gelatin for Tissue Regeneration
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Cited by 5 •
2019
We developed and describe a protocol based on the wet spinning concept, for the construction of gelatin-based biomaterials used for the application of tissue engineering.
FAQs
Solvent swelling increases access to the cured PDMS network and prepares the material for reagent-driven degradation. The liquid reagent can then promote cleavage of Si–O–Si bonds within the crosslinked siloxane structure, allowing selected regions to be removed. This coupled swelling and cleavage mechanism explains why reagent chemistry strongly influences whether etching proceeds effectively.
Crosslink density controls how tightly the siloxane network holds its structure and therefore influences how readily solvent swelling and chemical degradation can proceed. A change in network density can alter the etch rate and the resulting feature dimensions. Managing this variable is important when engineering channels, membranes, wells, or other three-dimensional structures.
Reagent composition, temperature, and exposure time are primary controls on the rate at which PDMS is removed. Crosslink density also contributes by changing the material’s resistance to swelling and bond degradation. Adjusting these variables affects the extent of feature formation, while poorly controlled conditions can increase swelling, residue formation, or dimensional variation.
A basic workflow selects the PDMS regions to be modified, exposes the cured material to a suitable liquid reagent, and controls reagent composition, temperature, and exposure time. The treatment is then managed to obtain the intended three-dimensional modification while limiting swelling and residue. These controls are central because PDMS offers limited dimensional precision during chemical removal.
The process can create or modify microfluidic channels, membranes, wells, and other three-dimensional features in PDMS. Its value lies in producing patterned changes in an elastomer that is widely used for engineered microscale structures. The selected application determines how closely the process must control etch rate, swelling, residue, and final feature dimensions.
Engineers should account for swelling, residue formation, and limited dimensional control when using the method for microfluidic or other microscale structures. These effects can change the intended geometry even when the reagent exposure is patterned. Careful control of composition, temperature, time, and material crosslink density helps improve the reliability of the resulting channels, wells, or membranes.