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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Phase Separation Micro Molding (PSμM) makes patterned polymer films whose channel walls can be dense, porous beneath a dense skin, or porous throughout. Researchers cast a polymer solution on a microstructured mold, then trigger phase separation so the polymer solidifies in the mold’s shape. The method’s promise is controllable transport through thin chip walls; its demonstrated results remain laboratory proof of concept, not evidence of commercial or clinical readiness.
How PSμM makes a patterned film
In the method reported by de Jong, Ankoné, Lammertink and Wessling in Lab on a Chip in 2005, a polymer solution is spread over a microstructured mold. The solution is then driven to phase-separate, fixing the polymer into a film that reproduces the mold’s features. In the demonstrated route, the cast solution is immersed in a non-solvent bath. Solvent and non-solvent exchange, the polymer precipitates, and slight shrinkage helps release the patterned film from the mold. The original study used silicon wafers as molds and PMMA and ABS copolymer as example polymers.
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Phase separation begins when a homogeneous polymer solution becomes supersaturated and separates into polymer-rich and polymer-lean regions before its structure is fixed. The polymer-rich phase gels and solidifies; the other phase helps define the pore structure. The authors describe inducing phase separation through solvent evaporation, a temperature change, or adding a non-solvent. In nonsolvent-induced phase separation, the non-solvent mixes with the solvent but not with the polymer.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhat determines whether the wall is dense or porous
PSμM does not produce one fixed pore structure. The outcome depends on the polymer, solvent and non-solvent system, temperature, casting thickness, and processing path. Pretreatment before immersion—such as allowing some solvent to evaporate or exposing the cast solution to non-solvent vapor—can also alter the result.
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| Wall morphology | Structure | Transport implication |
|---|---|---|
| Dense | No pores; the study describes pore size as zero. | Does not provide the porous-wall transport pathway central to the method’s proposed uses. |
| Porous substructure with a dense skin | A porous body lies beneath a dense surface layer. | The paper associates this structure with gas or vapor transport and related operations. |
| Fully porous | Pores extend through the film rather than being confined beneath a dense skin. | Can permit broader mass transport through the wall. |
The 2005 paper says pore sizes can range from zero to several microns. It also discusses process features down to 150 nm, but that is a method specification, not a general performance statistic or a claim that all pores reach that size. Greater porosity is constrained by mechanical stability: a wall must still withstand the conditions of its intended device.
What the original demonstration established
The 2005 team sealed patterned films to a transparent cover slip and demonstrated stacked multilayer assemblies. Its central proof of concept was fast CO₂ transport through the channel walls of a porous multilayer chip. The study also reported enhanced gas permeation when chip thickness was reduced and porosity incorporated, comparing porous films with dense films of the same material and with PDMS. These are results from the reported laboratory setup, not universal rankings of PSμM against every material or fabrication process.
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The experiment used channel widths of 100 μm and mold rim heights of 50 μm. Those dimensions describe the study’s setup rather than a standard size for PSμM devices. Its reported solvents included N-methyl-2-pyrrolidone and acetone, and its non-solvents included water and ethanol; these are historical experimental materials, not a present-day procurement recommendation or safety protocol.
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What porous channel walls could be used for
A porous wall can serve as a barrier through which gases, liquids, or solutes move selectively. The authors proposed several possible operations:
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- Gas–liquid or liquid–liquid contacting
- Membrane emulsification
- Separating or concentrating solutes, particles, or cells
- Degassing and pervaporation
- Concentrating a solution by evaporation
These are proposed application areas, not all demonstrated functions of the 2005 chip. The distinction matters: the study’s specific transport demonstration was CO₂ moving through porous channel walls. Fully porous films are suited to broader mass transfer in the authors’ framing, while a porous body capped by a dense skin is described for gas or vapor transport and related operations.
The authors also suggested that films with different morphologies could be stacked to combine operations, and that the approach might support disposable chips or scale-out. Those are possibilities, not evidence of industrial-scale production or a commercially available device.
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Why “tunable” does not mean geometry-independent
A 2020 Polymer Journal study examined open surface pores in micropatterned polyethersulfone (PES) membranes made by PSμM. It found that the micropatterned substrate significantly altered surface porosity and produced macrovoids under conditions that behaved differently on a flat substrate. The researchers used vapor-induced phase separation before nonsolvent-induced phase separation to prevent macrovoid formation, then adjusted casting-solution composition to obtain open pores. The follow-up study shows why recipes cannot be assumed to transfer unchanged between mold geometries: surface pattern and phase-separation sequence affect the resulting morphology.
How PSμM compares with other fabrication choices
PSμM is one route to a patterned polymer chip, not a universal replacement for etching, hot embossing, dense polymer chips, or PDMS. The 2005 authors argued that their replication approach offered advantages over existing fabrication approaches, but their evidence was a narrow proof of concept. Choosing a method depends on the required wall transport, pore structure, material, thickness, and mechanical demands.
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- Choose morphology by operation: decide whether the device needs a dense barrier, gas or vapor transport through a dense skin over a porous body, or broader transport through a fully porous wall.
- Balance permeability and strength: higher porosity may improve transport but mechanical stability limits how far porosity can be increased.
- Validate the mold-specific process: the PES follow-up shows that pattern geometry can change surface porosity and macrovoid formation, so conditions established on a flat substrate may not yield the same result on a patterned one.
- Treat performance comparisons narrowly: the gas-permeation findings compare the study’s porous films with dense films of the same material and PDMS; they do not establish a general winner across applications.
Sources and scope
The foundational report is J. de Jong et al., “New replication technique for the fabrication of thin polymeric microfluidic devices with tunable porosity,” Lab on a Chip, first published 28 September 2005. Read the paper. Bea Perks covered the work in Chemistry World on 9 November 2005. Read the coverage. The later morphology study is Yida Liu et al., “Fine-tuning of the surface porosity of micropatterned polyethersulfone membranes prepared by phase separation micromolding,” Polymer Journal, volume 52, pages 397–403 (2020). Read the paper.
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