Characterization of microfibril development on PTFE surface during hot imprinting process and its application for oil–water separation

Moon, In Yong; Lee, Ho Won; Oh, Youngseok; Kim, Se Jong; Kang, Seong-Hoon

doi:10.1007/s00170-019-03303-2

Cited by 9 publications

(3 citation statements)

References 36 publications

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“…It is a crystalline polymer with a high melting temperature of approximately 342 • C [45] and can operate within a wide range of temperatures, from −190 • C to 260 • C [46]. PTFE film is an ideal filter material for high-temperature dust filtration industries, such as oil-water separation [47], liquid-air separation [48], and removal of ultrafine particles in PM2.5 [49]. Moreover, PTFE film has been adapted to improve selectivity characterization of MEMS gas sensors [50] and served as a sensing substrate of flexible humidity sensors [51].…”

Section: Introductionmentioning

confidence: 99%

A Novel Packaging of the MEMS Gas Sensors Used for Harsh Outdoor and Human Exhale Sampling Applications

Chen

Chang

Chien

et al. 2023

Sensors

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Dust or condensed water present in harsh outdoor or high-humidity human breath samples are one of the key sources that cause false detection in Micro Electro-Mechanical System (MEMS) gas sensors. This paper proposes a novel packaging mechanism for MEMS gas sensors that utilizes a self-anchoring mechanism to embed a hydrophobic polytetrafluoroethylene (PTFE) filter into the upper cover of the gas sensor packaging. This approach is distinct from the current method of external pasting. The proposed packaging mechanism is successfully demonstrated in this study. The test results indicate that the innovative packaging with the PTFE filter reduced the average response value of the sensor to the humidity range of 75~95% RH by 60.6% compared to the packaging without the PTFE filter. Additionally, the packaging passed the High-Accelerated Temperature and Humidity Stress (HAST) reliability test. With a similar sensing mechanism, the proposed packaging embedded with a PTFE filter can be further employed for the application of exhalation-related, such as coronavirus disease 2019 (COVID-19), breath screening.

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Section: Introductionmentioning

confidence: 99%

A Novel Packaging of the MEMS Gas Sensors Used for Harsh Outdoor and Human Exhale Sampling Applications

Chen

Chang

Chien

et al. 2023

Sensors

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“…Superhydrophobic surfaces are widely used as an oil-water separator. Focusing on this, Moon et al [20] used a hot imprinting process to fabricate a superhydrophobic surface with a large area. By using the titanium master as a mold insert, Ristok et al [21] achieved the mass production compatible fabrication of polymer-based micro-lenses using injection compression molding.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Micro-Groove on the Surface of CFRP to Enhance the Connection Strength of Composite Part

Wei

et al. 2021

Polymers

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Carbon fiber-reinforced plastic (CFRP) has the advantages of being light weight, high strength, and corrosion resistant. At present, it is widely used in the lightweight design of automobile parts. The manufacturing of lightweight parts inevitably involves the connection between CFRP and the polymer material. The connection strength between CFRP and the polymer material significantly affects the service life of the composite parts. Taking CFRP and polyamide 6 (PA6) injection-molded composite parts as an example, this paper proposed a technological method to enhance the connection strength between CFRP and PA6. The proposed method was to fabricate micro-groove structures on the CFRP surface by compression molding. These micro-groove structures effectively increased the injection-molding area of the composite parts, thus enhancing the connection strength between CFRP and PA6. This paper presented a detailed study on the compression-molding process of micro-grooves on the CFRP surface, and successfully obtained the appropriate parameters. Finally, PA6 was used for injection molding on the CFRP with micro-grooves at an injection pressure of 8 MPa, an injection temperature of 240 °C, a holding pressure of 5 MPa, and a holding time of 2.5 s. The experimental results show that the micro-groove array structures on the CFRP surface could effectively improve the tensile strength of the connection interface in the composite parts. Compared with the composite part without micro-grooves, the tensile strength of the composite part with micro-grooves was increased by 80.93%. The composite parts prepared in this paper are mainly used in automobile interiors and the research results of this paper meet the actual needs of the enterprise.

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“…In our previous research, we have demonstrated that hot imprinting processes using pattern molds fabricated by wire electrical discharge machining (WEDM) are able to impart superhydrophobicity to the polymer surfaces [27,28]. The electrical discharge machined (EDM) surface has rough morphology consisting of a few micro-sized discharge craters.…”

Section: Introductionmentioning

confidence: 99%

Development of a roll-to-roll hot imprinting process for superhydrophobic polytetrafluoroethylene surfaces

Moon¹,

Lee²,

Oh³

et al. 2019

J. Micromech. Microeng.

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Potential applications of superhydrophobic surfaces have attracted many researchers. Although numerous methods have been suggested to achieve superhydrophobic surfaces on various types of materials, only a few methods are suitable for process simplicity, productivity and large area applicability. In this study, we developed a roll-to-roll hot imprinting process for superhydrophobic surfaces to overcome such limitations. Hierarchical patterns were fabricated on the roll surface through wire electrical discharge machining. Through the roll-to-roll hot imprinting process using the pattern roll, the hierarchical patterns were transferred to the polytetrafluoroethylene surface. As a result, superhydrophobic surfaces with a water contact angle of 150° or more were obtained.

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Characterization of microfibril development on PTFE surface during hot imprinting process and its application for oil–water separation

Cited by 9 publications

References 36 publications

A Novel Packaging of the MEMS Gas Sensors Used for Harsh Outdoor and Human Exhale Sampling Applications

A Novel Packaging of the MEMS Gas Sensors Used for Harsh Outdoor and Human Exhale Sampling Applications

Fabrication of Micro-Groove on the Surface of CFRP to Enhance the Connection Strength of Composite Part

Development of a roll-to-roll hot imprinting process for superhydrophobic polytetrafluoroethylene surfaces

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