Fabrication of Random Microspikes on Mold Metal by Ultrashort Laser Ablation for Hydrophilic Surface

Noh, Jiwhan; Lee, Jae Hoon; Lee, Sang Yup; Na, Suck-Joo

doi:10.1143/jjap.49.106503

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…Femtosecond laser technology was applied by Yao et al [133] and Choi et al [134] separately for the flat mold of anti-reflective film and microfluidics. Tanaka et al [135] and Noh et al [136] fabricated microstructures on mold metal by laser ablation. LIGA technology, including E-beam LIGA [137][138][139], UV-LIGA [140,141], x-ray LIGA [142][143][144] and laser LIGA [145], is a stepwise microstructuring process, developed in the 1990s, and is interesting for industrial scale commercialization.…”

Section: Mold Fabricationmentioning

confidence: 99%

Micro hot embossing of thermoplastic polymers: a review

Peng

Deng

et al. 2013

J. Micromech. Microeng.

212

157

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Micro hot embossing of thermoplastic polymers is a promising process to fabricate high precision and high quality features in micro/nano scale. This technology has experienced more than 40 years development and has been partially applied in industrial production. Three modes of micro hot embossing including plate-to-plate, roll-to-plate and roll-to-roll have been successively developed to meet the increasing demand for large-area patterned polymeric films. This review surveys recent progress of micro hot embossing in terms of polymeric material behavior, embossing process and corresponding apparatus. Besides, challenges and innovations in mold fabrication techniques are comprehensively summarized and industrial applications are systematically cataloged as well. Finally, technical challenges and future trends are presented for micro hot embossing of thermoplastic polymers.

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Section: Mold Fabricationmentioning

confidence: 99%

Micro hot embossing of thermoplastic polymers: a review

Peng

Deng

et al. 2013

J. Micromech. Microeng.

212

157

View full text Add to dashboard Cite

show abstract

“…These also resemble the morphology reported by Patankar 13 and Bhushan et al 14 It is also in agreement with findings that by increasing the surface roughness, a reversible surface switching between hydrophobic and hydrophilic states can be realised on flower-like nanostructured titanium dioxide films. 15 Noh et al, 16 have clearly demonstrated these processes by creating micro and nano patterns by laser ablation and correlating the contact angle with lotus leaves. They have reported the nano-size roughness made by 10 m spikes on lotus leaves enhances the hydrophilicity.…”

Section: Resultsmentioning

confidence: 99%

“…They have claimed that the roughness made by microspikes formed by laser ablation will enhance hydrophilicity. 16 Since the control Al does not become hydrophilic after laser exposure, unlike the grained and anodised Al, it is apparent that to achieve a hydrophilic change using a picosecond fibre laser, it is necessary that the Al substrate be grained and anodised. Figure 6 is a SEM micrograph showing the sites where the EDX was carried out on laser processed anodised Al while Figure 7 shows the corresponding spectra.…”

Section: Resultsmentioning

confidence: 99%

Modification of Anodised Aluminium Surfaces Using a Picosecond Fibre Laser for Printing Applications

Ansari

Watkins²,

Sharp³

et al. 2012

j. nanosci. nanotech.

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The use of an ultrafast fibre laser at a wavelength of 1064 nm has allowed the surface modification of anodised aluminium plates coated with a 2 micron thick anodised layer for potential industrial applications. The micro- and nano-scale structuring of the anodised aluminium using picosecond pulses of approximately 25 ps duration at 200 kHz repetition rate was investigated. The interaction of the laser with the substrate created a hydrophilic surface, giving a contact angle of less than 10 degrees. On examination under a Scanning Electron Microscope (SEM), a morphology created due to laser induced spallation was observed. It has been found that these laser processed hydrophilic surfaces revert to a hydrophobic state with time. This has potential for application in the printing industry and offers reusability and sustainability of the process materials. This has been confirmed in initial trials.

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“…Laser machining is an advanced manufacturing process using light that has a high energy density. [1][2][3][4][5][6][7][8][9][10][11][12][13] This laser processing is not only easy to use with hard materials but also can cut precise shapes, which is impossible by previous machining techniques, such as plasma cutting. To increase these advantages of laser machining, a tilt mirror using some actuators should allow the laser beam to move more precisely and accurately.…”

Section: Introductionmentioning

confidence: 99%

Design of a Piezoelectric-Driven Tilt Mirror for a Fast Laser Scanner

Park

Lee

et al. 2012

Jpn. J. Appl. Phys.

Self Cite

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Recently, laser scanners have been used for laser processing such as cutting, welding, and grooving, especially in the automotive industry. The laser scanners need a high-speed driving to minimize cracks caused by thermal shock of brittle materials. Therefore, a novel laser processing system that is composed of a laser source and a piezoelectric-driven tilt mirror to control the reflection angle of the laser beam, and a stage equipped with the tilt mirror has been investigated. In this study, a piezoelectric-driven tilt mirror is designed and analyzed for scanning performance to achieve a beam spot of 30 µm, a pattern width of 1 mm, an overlap ratio of 70% of the circle area, and a scanning speed of 1 m/s. Then, structural analysis of the tilt mirror with three piezoelectric actuators is performed to determine the maximum reflection angle and resonance frequency. Finally, a prototype tilt mirror is fabricated and its basic characteristics are experimentally investigated and discussed.

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Fabrication of Random Microspikes on Mold Metal by Ultrashort Laser Ablation for Hydrophilic Surface

Cited by 8 publications

References 21 publications

Micro hot embossing of thermoplastic polymers: a review

Micro hot embossing of thermoplastic polymers: a review

Modification of Anodised Aluminium Surfaces Using a Picosecond Fibre Laser for Printing Applications

Design of a Piezoelectric-Driven Tilt Mirror for a Fast Laser Scanner

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