Hydrophobic Recovery of Polydimethylsiloxane Elastomer Exposed to Partial Electrical Discharge

Kim, Jong-Soo; Chaudhury, Manoj K.; Owen, Michael J.

doi:10.1006/jcis.2000.6817

Cited by 210 publications

(212 citation statements)

References 26 publications

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“…Immediately after bonding, media were loaded to preserve the hydrophilic state of the plasma-activated PDMS 21 and support the adhesion of cells. 22 Alternatively, bonded devices were left overnight for the diffusive return of oligomers, thereby restoring the hydrophobic state of the PDMS surface, 23,24 followed by atmospheric pressure air plasma stencilling with a Tesla generator operating with 30 kV at 2 MHz. 22 By contacting the emitter tip to the microchannel inlet the plasma is routed along the linear path of least resistance, oxidising the PDMS surface to produce a hydrophilic path which supports cell adhesion, while the surrounding PDMS remains biologically inert to confine cell adhesion to the trap regions.…”

Section: Design Fabrication and Packagingmentioning

confidence: 99%

“…This approach requires a hydrophobic PDMS state which can be restored, following plasma bonding, by the diffusive return of oligomers to the surface during overnight incubation in a dry state. 24 Native PDMS surfaces provide biologically inert backgrounds which resist cell adhesion. [26][27][28] Hydrophilic patterns for cell adhesion were provided within the microfluidic system by plasma stencilling using a Tesla generator.…”

Section: Single Cell Pairingmentioning

confidence: 99%

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A microfluidic array with cellular valving for single cell co-culture

et al. 2011

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We present a highly parallel microfluidic approach for contacting single cell pairs. The approach combines a differential fluidic resistance trapping method with a novel cellular valving principle for homotypic and heterotypic single cell co-culturing. Differential fluidic resistance was used for sequential single cell arraying, with the adhesion and flattening of viable cells within the microstructured environment acting to produce valves in the open state. Reversal of the flow was used for the sequential single cell arraying of the second cell type. Plasma stencilling, along the linear path of least resistance, was required to confine the cells within the trap regions. Prime flow conditions with minimal shear stress were identified for highly efficient cell arraying ($99%) and long term cell culture. Larger trap dimensions enabled the highest levels of cell pairing ($70%). The single cell co-cultures were in close proximity for the formation of connexon structures and the study of contact modes of communication. The research further highlights the possibility of using the natural behaviour of cells as the working principle behind responsive microfluidic elements.

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Section: Design Fabrication and Packagingmentioning

confidence: 99%

Section: Single Cell Pairingmentioning

confidence: 99%

A microfluidic array with cellular valving for single cell co-culture

et al. 2011

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“…[1][2][3] Especially in electric power industry, PDMS-based silicone rubber insulators are currently replacing conventional inorganic ceramics for high-voltage applications because of their light weight, good dielectric property, and excellent water repellency. [4][5][6][7][8] Owing to the hydrophobic methyl groups and low free surface energy, surface hydrophobicity is one of the most important factors that contributes to the superior performance of preventing moisture from silicon rubbers. [5][6][7] However, if insulators have been in service for long time, the initial hydrophobic surface would be altered to be hydrophilic.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8] Owing to the hydrophobic methyl groups and low free surface energy, surface hydrophobicity is one of the most important factors that contributes to the superior performance of preventing moisture from silicon rubbers. [5][6][7] However, if insulators have been in service for long time, the initial hydrophobic surface would be altered to be hydrophilic. Generally, the environmental factors that cause the degradation include high temperature, ultraviolet light, acid rain, sandblast, plasma, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ambient Temperature on Hydrophobic Recovery Behavior of Silicone Rubber Composites

Peng

Zheng

et al. 2017

J. Mol. Eng. Mater.

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A series of silicone rubber samples with di®erent cyclosiloxanes contents have been successfully prepared, and their hydrophobic recovery behaviors and mechanism were investigated in detail. The gas chromatography-mass spectroscopy technique after Soxhlet extraction was utilized to examine the low molecular weight siloxanes in the sample, SEM was used to observe the surface morphology of the silicone rubber in°uenced by plasma treatment, and contact angle measurement was applied to probe the hydrophobic recovery of the sample surface after plasma treatment at di®erent storage temperatures. The storage time-dependent contact angle of water can be well tted by the di®usion model calculated from Fick's second law. The results imply that the hydrophobic recovery of silicone rubber is related to the di®usion of low molecular weight siloxanes, while larger content or higher temperature can induce faster hydrophobic recovery.

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“…Kim et al have pointed out that hydrophobic recovery after UV or plasma modification, low-molecular-weight (LMW) and uncrosslinked PDMS fragments could migrate from the bulk and cover the degraded surface over a short time period: usually a few hours to a few days [8].…”

Section: Introductionmentioning

confidence: 99%

The surface structure and hydrophobic recovery of poly-dimethylsioxane insulator after ar plasma treatment

Zheng

Chunqing

Fang

et al. 2014

Proc. 2nd Japan-China Joint Workshop on Positron Science

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The effect of small molecules in poly(dimethyl siloxane) (PDMS) on the hydrophobic recovery has been studied. Soxhlet extraction was employed to remove the small molecules. The original and extracted samples were probed by positron annihilation and scanning electron microscopy (SEM). The results confirmed that the surface of unmodified PDMS is covered by the small molecules. PDMS with varying octamethylsiloxane (D4) content was modified by argon plasma. The variation of contact angle with the ageing time for different samples was studied by contact angle measurement. As a result it was shown that all the samples can recover to the original hydrophobic surface state after sufficient ageing time. Samples with higher D4 content exhibit a faster hydrophobic recovery. For the sample extracted first and then plasma modified, the hydrophobic recovery rate is very low, and such samples did not return to the untreated hydrophobic state.

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Hydrophobic Recovery of Polydimethylsiloxane Elastomer Exposed to Partial Electrical Discharge

Cited by 210 publications

References 26 publications

A microfluidic array with cellular valving for single cell co-culture

A microfluidic array with cellular valving for single cell co-culture

Effect of Ambient Temperature on Hydrophobic Recovery Behavior of Silicone Rubber Composites

The surface structure and hydrophobic recovery of poly-dimethylsioxane insulator after ar plasma treatment

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