Development of highly durable and low friction micro-structured PDMS coating based on bio-inspired surface design

Ryu, Byung Hoon; Kim, Dae Eun

doi:10.1016/j.cirp.2015.03.004

Cited by 32 publications

(11 citation statements)

References 19 publications

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“…Optical access is extremely important not only for developing lab-on-a-chip devices but also for understanding physical and biological processes within these devices [64][65][66][67][68]. The above mentioned properties along with durability [69] and gas permeability [70] make PDMS an ideal material for flexible microfluidics. Furthermore, PDMS can be easily bonded to other substrates using plasma surface treatment [71].…”

Section: Siloxane Elastomersmentioning

confidence: 99%

Flexible Microfluidics: Fundamentals, Recent Developments, and Applications

et al. 2019

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Miniaturization has been the driving force of scientific and technological advances over recent decades. Recently, flexibility has gained significant interest, particularly in miniaturization approaches for biomedical devices, wearable sensing technologies, and drug delivery. Flexible microfluidics is an emerging area that impacts upon a range of research areas including chemistry, electronics, biology, and medicine. Various materials with flexibility and stretchability have been used in flexible microfluidics. Flexible microchannels allow for strong fluid-structure interactions. Thus, they behave in a different way from rigid microchannels with fluid passing through them. This unique behaviour introduces new characteristics that can be deployed in microfluidic applications and functions such as valving, pumping, mixing, and separation. To date, a specialised review of flexible microfluidics that considers both the fundamentals and applications is missing in the literature. This review aims to provide a comprehensive summary including: (i) Materials used for fabrication of flexible microfluidics, (ii) basics and roles of flexibility on microfluidic functions, (iii) applications of flexible microfluidics in wearable electronics and biology, and (iv) future perspectives of flexible microfluidics. The review provides researchers and engineers with an extensive and updated understanding of the principles and applications of flexible microfluidics.

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Section: Siloxane Elastomersmentioning

confidence: 99%

Flexible Microfluidics: Fundamentals, Recent Developments, and Applications

et al. 2019

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“…A combination of plasma, reaction with an atom transfer radical polymerization initiator and surface grafting of polyacrylamide gave a hydrophilic modification of Sylgard 184 (θ A , 70°; θ R , 0°) that resisted protein adsorption and did not show reversion to hydrophobicity . A variety of substrates including Sylgard 184 can be modified with an aqueous solution of polydopamine, which provides a hydrophilic nanocoating (WCA ≈ 50°). − A hydrophilic PDMS surface with low levels of protein adsorption may be obtained by chemical processes such as networks prepared by click reactions between azidoalkylsiloxanes and alkynyl-modified siloxanes and/or poly(ethylene glycol)s …”

Section: Introductionmentioning

confidence: 99%

“Big Dipper” Dynamic Contact Angle Curves for Pt-Cured Poly(dimethylsiloxane) on a Thermal Gradient: Inter-relationships of Hydrosilylation, Si–H Autoxidation, and Si–OH Condensation to a Secondary Network

et al. 2019

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Platinum cure for poly(dimethylsiloxane) (PDMS) coatings on a thermal gradient (45–140 °C) was carried out to study the effect of temperature on surface chemistry and wetting behavior. The motivation is the interest in surfaces with continuous gradients in wettability for applications such as protein adsorption, controlling bacterial adhesion, directional movement of cells, and biosensors. The Wilhelmy plate method and the advancing/receding drop method were employed for determining the positional dependence of θA and θR. A strong dependence of receding contact angles (θR) on cure temperature was found for Sylgard 184 (S-PDMS) and a Pt-cured laboratory-prepared analogue (Pt-PDMS) of known composition. Cure on the thermal gradient gave rise to striking “Big Dipper” Wilhelmy plate dynamic contact angle curves. High contact angle hysteresis (60–80°) was found for 45 °C cure (CAH = θΔ = θA – θR) but low CAH for 140 °C cure (10–20°). Drop addition/withdrawal using goniometry identified a similar trend. Attenuated total reflectance infrared spectroscopy showed absorptions for Si–OH (3500 cm–1) and Si–H (1250 cm–1) that were correlated with wetting behavior and near-surface chemistry. These studies revealed a complex relationship among hydrosilylation, Si–H autoxidation, and condensation of Si–OH. A model for advancing from a single network due to hydrosilylation to a double network for hydrosilylation plus Si–O–Si from condensation of Si–OH best explains evidence from spectroscopic and contact angle studies. These results are relevant to interactions of Pt-cured silicones at bio-interfaces, as receding contact angles determine work of adhesion, as well as applications that benefit from maximum hydrophobicity and minimizing water roll-off angles.

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“…Superhydrophobic PDMS microfluidic devices have been previously reported. − Generally, these devices are open, one-channel systems. Usually, PDMS microfluidic devices for biology or biochemistry are closed-channel systems, which enable the control of surface chemistry and bioactivity. − However, the utility of these devices is affected by changes in water mobility resulting from surface modifications.…”

Section: Introductionmentioning

confidence: 99%

“…Previous research has shown that superhydrophobic rough surfaces can improve water mobility. − It has also been suggested that hydrophilic rough surfaces can provide similar improvement − , and that the effect of rough surfaces on water mobility depends on their geometry and dimensions.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Devices Containing ZnO Nanorods with Tunable Surface Chemistry and Wetting-Independent Water Mobility

et al. 2019

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Interest in polydimethylsiloxane (PDMS) microfluidic devices has grown dramatically in recent years, particularly in the context of improved performance lab-on-a-chip devices with decreasing channel size enabling more devices on ever smaller chips. As channels become smaller, the resistance to flow increases and the device structure must be able to withstand higher internal pressures. We report herein the fabrication of microstructured surfaces that promote water mobility independent of surface static wetting properties. The key tool in this approach is the growth of ZnO nanorods on the bottom face of the microfluidic device. We show that water flow in these devices is similar whether the textured nanorod-bearing surface is hydrophilic or superhydrophobic; that is, the device tolerates a wide range of surface wetting properties without changing the water flow within the device. This is not the case for smooth surfaces with different wetting properties, wherein hydrophilic surfaces result in slower flow rates. The ability to create monolayer-coated ZnO nanorods in a PDMS microfluidic device also allows for a variety of surface modifications within standard mass-produced devices. The inorganic ZnO nanorods can be coated with alkyl phosphonate monolayers. These monolayers can be used to convert hydrophilic surfaces into hydrophobic and even superhydrophobic surfaces that provide a platform for further surface modification. We also report photopatterned biomolecule immobilization within the channels on the monolayer-coated ZnO rods.

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Development of highly durable and low friction micro-structured PDMS coating based on bio-inspired surface design

Cited by 32 publications

References 19 publications

Flexible Microfluidics: Fundamentals, Recent Developments, and Applications

Flexible Microfluidics: Fundamentals, Recent Developments, and Applications

“Big Dipper” Dynamic Contact Angle Curves for Pt-Cured Poly(dimethylsiloxane) on a Thermal Gradient: Inter-relationships of Hydrosilylation, Si–H Autoxidation, and Si–OH Condensation to a Secondary Network

Microfluidic Devices Containing ZnO Nanorods with Tunable Surface Chemistry and Wetting-Independent Water Mobility

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