Simple Atmospheric-Pressure Nonthermal Plasma-Jet System for Poly(dimethylsiloxane) Bonding Process

Kim, Kangil; Kim, Geunyoung; Oh, Yeongtaek; Park, Tae-Gyu; Han, Dong; Yang, Sang Sik

doi:10.7567/jjap.51.06fl15

Cited by 12 publications

(7 citation statements)

References 30 publications

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“…After the plasma treatment, silanol groups Si-O-H substitute for methyl groups -CH 3 [42]. Due to the existence of the silanol groups, the surface becomes hydrophilic, and it can be observed by the change of the contact angle [44]. There are many applications of this principle such as PDMS-glass bonding [45], pump-less surfaced microfluidics [46], hydrophilic patterning [47] and etc.…”

Section: Pdms For Manipulation Platformmentioning

confidence: 99%

Universal Plasma Jet for Droplet Manipulation on a PDMS Surface towards Wall-Less Scaffolds

Peng

Tsai

2021

Polymers

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Droplet manipulation is important in the fields of engineering, biology, chemistry, and medicine. Many techniques, such as electrowetting and magnetic actuation, have been developed for droplet manipulation. However, the fabrication of the manipulation platform often takes a long time and requires well-trained skills. Here we proposed a novel method that can directly generate and manipulate droplets on a polymeric surface using a universal plasma jet. One of its greatest advantages is that the jet can tremendously reduce the time for the platform fabrication while it can still perform stable droplet manipulation with controllable droplet size and motion. There are two steps for the proposed method. First, the universal plasma jet is set in plasma mode for modifying the manipulation path for droplets. Second, the jet is switched to air-jet mode for droplet generation and manipulation. The jetted air separates and pushes droplets along the plasma-treated path for droplet generation and manipulation. According to the experimental results, the size of the droplet can be controlled by the treatment time in the first step, i.e., a shorter treatment time of plasma results in a smaller size of the droplet, and vice versa. The largest and the smallest sizes of the generated droplets in the results are about 6 L and 0.1 L, respectively. Infrared spectra of absorption on the PDMS surfaces with and without the plasma treatment are investigated by Fourier-transform infrared spectroscopy. Tests of generating and mixing two droplets on a PDMS surface are successfully achieved. The aging effect of plasma treatment for the proposed method is also discussed. The proposed method provides a simple, fast, and low-cost way to generate and manipulate droplets on a polymeric surface. The method is expected to be applied to droplet-based cell culture by manipulating droplets encapsulating living cells and towards wall-less scaffolds on a polymeric surface.

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Section: Pdms For Manipulation Platformmentioning

confidence: 99%

Universal Plasma Jet for Droplet Manipulation on a PDMS Surface towards Wall-Less Scaffolds

Peng

Tsai

2021

Polymers

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“…27) There have been some works on PDMS treatment using low-pressure plasmas 28,29) and, recently, using atmospheric-pressure plasmas. 30,31) Figure 6 shows the typical surface profiles of 10 µl of water droplets before and after plasma treatment. These decreases with input voltage and flow rate but increases with working Figure 8 shows the contact angle recovery as a function of time after the Ar plasma treatment of the PDMS surface.…”

Section: Hydrophilic Surface Treatmentmentioning

confidence: 99%

“…The hydrophobic recovery of PDMS surface after plasma treatment has been established in many studies which is due to the migration of lowermolecular-weight (LMW) species from the bulk to the surface of PDMS. 30) The surface rapidly loses its hydrophilicity in 5 h. After 40 h, the surface reverts to being hydrophobic.…”

Section: Hydrophilic Surface Treatmentmentioning

confidence: 99%

Surface treatment of glass and poly(dimethylsiloxane) using atmospheric-pressure plasma jet and analysis of discharge characteristics

Seo

Cha

Han

et al. 2014

Jpn. J. Appl. Phys.

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An atmospheric-pressure plasma jet source based on dielectric barrier discharge (DBD) was prepared for the hydrophilic surface treatment of poly(dimethylsiloxane) (PDMS). Discharge characteristics were investigated from intensified charge coupled device (ICCD) images and by optical emission spectroscopy (OES). Different optical emission profiles were observed in plasmas with argon (Ar) and helium (He) feed gases. For Ar plasma, OH and N 2 related emission lines are dominant. On the other hand, relatively strong peaks of N 2 + and O excited species were observed in He plasma, suggesting that a metastable He atom plays an important role in the downstream plasma region. Ar plasma was further found to be more effective than He plasma for hydrophilic surface modification. The surface reverted to being hydrophobic about 40 h after plasma irradiation.

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“…In order to reduce stress, the boric acid was added to the electrolyte. 33) A 8-µmthick nickel layer was deposited and the photoresist was removed using stripper (AZ Electronic Materials AZ400T). The sputtered Cr/Au layer was patterned to provide the mesh grid electrode.…”

Section: Device Design and Fabricationmentioning

confidence: 99%

A novel micro-machined mesh grid for a triode-type carbon nanotube field emitter

Lee

Hong

et al. 2014

Jpn. J. Appl. Phys.

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Hydrogen absorptions of LaFe 11.5 Si 1.5 compound in 1-atm hydrogen gas at different temperatures are investigated. The hydrogen content in the hydrogenated sample does not increase with the increase of temperature of hydrogen absorption but changes complicatedly. The characteristic of first-order transition in LaFe 11.5 Si 1.5 compound is weakened after hydrogen absorption. It leads the peaks of magnetic entropy to become wider and the hysteresis loss to reduce significantly, but relative cooling power (RCP) is not changed considerably.

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Simple Atmospheric-Pressure Nonthermal Plasma-Jet System for Poly(dimethylsiloxane) Bonding Process

Cited by 12 publications

References 30 publications

Universal Plasma Jet for Droplet Manipulation on a PDMS Surface towards Wall-Less Scaffolds

Universal Plasma Jet for Droplet Manipulation on a PDMS Surface towards Wall-Less Scaffolds

Surface treatment of glass and poly(dimethylsiloxane) using atmospheric-pressure plasma jet and analysis of discharge characteristics

A novel micro-machined mesh grid for a triode-type carbon nanotube field emitter

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