Solvent‐Resistant PDMS Microfluidic Devices with Hybrid Inorganic/Organic Polymer Coatings

Kim, Bo-Yeol; Hong, Lan-Young; Chung, Young-Min; Kim, Dong‐Pyo; Lee, Chang‐Soo

doi:10.1002/adfm.200901024

Cited by 102 publications

(88 citation statements)

References 35 publications

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“…Before fabricating PFPE microfluidic channels and exploring SFL process in the channels, we designed a simple experiment to check whether the PFPE-silicone elastomer could provide oxygen 40 lubrication layers for SFL (Fig. 1).…”

Section: Oxygen Inhibited Radical Polymerization On Pfpe Surfacesmentioning

confidence: 99%

“…The requirement can cause the increase of the lag times associated with pulsed flow, and the decrease of particle synthesis 40 throughput. Considering the SFL process time scales at the maximum throughput 2 , we estimated the reduction rates of particle throughput in PFPE devices.…”

Section: Comparison With Pdms-based Flow Lithographymentioning

confidence: 99%

“…Recently, we developed oxygen-free FL that enables SFL process in wide ranges of solvent resistant devices 49 . However, the device fabrication process in oxygen-free FL is somewhat 40 complex as the devices should be prepared as 3D channels for flow-stacking. PFPE devices can be an efficient platform for SFL with organic solvents without flow stacking process.…”

Section: Comparison With Pdms-based Flow Lithographymentioning

confidence: 99%

“…Devices were mounted on an inverted microscope (Axiovert 200, Zeiss) equipped with a VS25 shutter system (UniBlitz) to 40 precisely control the UV exposure dose. A photomask was then inserted into the field-stop of the microscope.…”

Section: Photopolymerization Setupmentioning

confidence: 99%

“…(1) The channel material should be compatible 40 with soft lithography to allow rapid prototyping of channels with various geometries. SFL devices have been fabricated with multiple inlet pathways or layered channels to create structured micro-flows for the synthesis of chemically patterned particles [1][2][3][4][5][6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

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Stop flow lithography in perfluoropolyether (PFPE) microfluidic channels

2014

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5Stop Flow Lithography (SFL) is a microfluidic-based particle synthesis method for creating anisotropic multifunctional particles with applications that range from MEMs to biomedical engineering. Polydimethylsiloxane (PDMS) has been typically used to construct SFL devices as the material enables rapid prototyping of channels with complex geometries, optical transparency, and oxygen permeability. However, PDMS is not compatible with most organic solvents which limit the current range of materials 10 that can be synthesized with SFL. Here, we demonstrate that a fluorinated elastomer, called perfluoropolyether (PFPE), can be an alternative oxygen permeable elastomer for SFL microfluidic flow channels. We fabricate PFPE microfluidic devices with soft lithography and synthesize anisotropic multifunctional particles in the devices via the SFL process -this is the first demonstration of SFL with oxygen lubrication layers in a non-PDMS channel. We benchmark the SFL performance of the PFPE 15 devices by comparing them to PDMS devices. We synthesized particles in both PFPE and PDMS devices under the same SFL conditions and found the difference of particle dimensions was less than a micron. PFPE devices can greatly expand the range of precursor materials that can be processed in SFL because the fluorinated devices are chemically resistant to most organic solvents, an inaccessible class of reagents in PDMS-based devices due to swelling.

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Section: Oxygen Inhibited Radical Polymerization On Pfpe Surfacesmentioning

confidence: 99%

Section: Comparison With Pdms-based Flow Lithographymentioning

confidence: 99%

Section: Comparison With Pdms-based Flow Lithographymentioning

confidence: 99%

Section: Photopolymerization Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stop flow lithography in perfluoropolyether (PFPE) microfluidic channels

2014

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Inherently UV Photodegradable Poly(methacrylate) Gels

Scheiger

Brehm

et al. 2021

Adv Funct Materials

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Organogels (hydrophobic polymer gels) are soft materials based on polymeric networks swollen in organic solvents. They are hydrophobic and possess a high content of solvent and low surface adhesion, rendering them interesting in applications such as encapsulants, drug delivery, actuators, slippery surfaces (self-cleaning, anti-waxing, anti-bacterial), or for oil-water separation. To design functional organogels, strategies to control their shape and surface structure are required. Herein, the inherent UV photodegradability of poly(methacrylate) organogels is reported. No additional photosensitizers are required to efficiently degrade organogels (d ≈ 1 mm) on the minute scale. A low UV absorbance and a high swelling ability of the solvent infusing the organogel are found to be beneficial for fast photodegradation, which is expected to be transferrable to other gel photochemistry. Organogel arrays, films, and structured organogel surfaces are prepared, and their extraction ability and slippery properties are examined. Films of inherently photodegradable organogels on copper circuit boards serve as the first ever positive gel photoresist. Spatially photodegraded organogel films protect or reveal copper surfaces against an etchant (FeCl 3 aq. ).

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Tailoring Dynamic Chains of Cross‐Linked PDMS to Hinder Oil Penetration

Hao,

Jing,

Wang

et al. 2024

Adv Materials Technologies

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Polydimethylsiloxane (PDMS) is the most studied organosilicon polymer, finding broad applications in soft lithography of microfluidic devices, wearable electronics insulation, medical tubing, shielding coatings, and sealant elements. However, their cross‐linked forms swell severely in nonpolar oils due to the comparable solubility parameters. Here, an oil‐stable cross‐linked PDMS discovered by grafting flexible PDMS chains onto its polymeric networks is reported, which enables surface‐exposed chains with high dynamics. It is found that the synergetic effect of mobile nanopore filling and quasi‐liquid lubrication of PDMS brushes endows the cross‐linked matrix with a reduced oil absorption ratio of up to 91.7% without altering its surface composition. Moreover, stretching polymeric networks can be re‐arranged with an adequate grafting of PDMS chains, further enhancing the antipenetration performance. This discovery of the oil‐stable surface configuration of cross‐linked PDMS breaks the constraint of siloxane elastomers not being applicable in nonpolar soluble liquid, opening a new era of research in organosilicon chemistry.

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Solvent‐Resistant PDMS Microfluidic Devices with Hybrid Inorganic/Organic Polymer Coatings

Cited by 102 publications

References 35 publications

Stop flow lithography in perfluoropolyether (PFPE) microfluidic channels

Stop flow lithography in perfluoropolyether (PFPE) microfluidic channels

Inherently UV Photodegradable Poly(methacrylate) Gels

Tailoring Dynamic Chains of Cross‐Linked PDMS to Hinder Oil Penetration

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