Dynamic changes in PDMS surface morphology in femtosecond laser treatment

Moon, Han Seb; Sidhu, Mehra S.; Lee, Heung Soon; Jeoung, Sae Chae

doi:10.1364/oe.23.019854

Cited by 10 publications

(7 citation statements)

References 18 publications

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“…They reported a pulse overlap rate range of 1–2 pulses per micrometer and 1–1.5 μJ to achieve quality separation and fabrication without any visible thermal damages. Moon et al studied the effect of crater size on the surface morphology of PDMS . They studied the PDMS surface with varying both the inter‐pulse interval and the inter‐spot distance between successive pulses.…”

Section: Polymer Materialsmentioning

confidence: 99%

Laser ablation of polymers: a review

Ravi‐Kumar

Lies

Zhang

et al. 2019

Polymer International

152

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Laser ablation (LA), which employs a pulsed laser to remove materials from a substrate for generating micro-/nanostructures, has tremendous applications in the fabrication of metals, ceramics, glasses and polymers. It has become a noteworthy approach for achieving various functional structures in engineering, chemistry, biology, medicine and other fields. Polymers are one such class of materials; they can be melted and vaporized at high temperature during the ablation process. A number of polymers have been researched as candidate substrates in LA, and many different structures and patterns have been realized by this method. The current states of research and progress are reviewed from basic concepts to optimal parameters, polymer types and applications. The significance of this paper is to provide a basis for follow-up research that leads to the development of superior materials and high-quality production through LA. In this review, we first introduce the basic concept of LA, including mechanism, laser types (millisecond, microsecond, nanosecond, picosecond and femtosecond) and influential parameters (wavelength, repetition rate, fluence and pulse duration). Then, we focus on several commonly used polymer materials and compare them in detail, including the effects of polymer properties, laser parameters and feature designs. Finally, we summarize the applications of various structures fabricated by LA in a variety of areas along with a perspective of the challenges in this research area. Overall, a thorough review of LA of several polymers is presented, which could pave the way for characterization of future novel materials.

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Section: Polymer Materialsmentioning

confidence: 99%

Laser ablation of polymers: a review

Ravi‐Kumar

Lies

Zhang

et al. 2019

Polymer International

152

View full text Add to dashboard Cite

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“…Ultrafast laser μprocessing was applied to pattern a grid inside PDMS because the damage due to the micro-processing could be minimized. 30,31) We have further confirmed that there are no observable changes in material properties of PDMS due to ultrafast laser engraving by measuring the Poisson's ratio of the grid, which is patterned with varying the laser energy as well as the number of grid patterns on the specimen.…”

Section: Introductionmentioning

confidence: 55%

Poisson’s ratio measurement through engraving the grid pattern inside poly(dimethylsiloxane) by ultrafast laser

Cho

Kim

Seo

et al. 2021

Jpn. J. Appl. Phys.

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This work demonstrates an application of ultrafast laser processing to engrave a grid pattern for evaluating mechanical properties. No observable changes in the material properties caused by laser engraving were confirmed if the grid pattern is engraved with laser energy of 0.21 μJ/pulse and pulse repetition rate of 1 kHz. The shape changes of grid pattern directly reveal whether the deformation accompanied with stretching is uniaxial or not. By analyzing the optical images of the grid pattern, Poisson ratio, Young’s modulus, and shear modulus of poly(dimethylsiloxane) (PDMS) with a weight percent of curing agent of 9% were estimated to be 0.49989 ± 0.00111, 1.45 ± 0.01 MPa, and 0.725 MPa, respectively. The comparison of the current results with the literature values suggests that the proposed method is appropriate to provide quantitative mechanical properties of soft materials with high accuracy.

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“…The another possible explanation is a dynamical changes in the portion of vascular endothelium close to the laser irradiated position caused by the mechanical forces accompanied by the shockwaves. We have recently reported that the effect of the dynamics of crater size on the elastomer of poly(dimethylsiloxane) (PDMS) morphology in fs-laser micro-processing [24]. The crater formed on vascular endothelium should deform out of focal position for the confocal microscopic measurement after laser irradiation and be eventually restored to the steady state.…”

Section: Resultsmentioning

confidence: 99%

Selective disruption of vascular endothelium of zebrafish embryos by ultrafast laser microsurgical treatment

Woo

Moon

Kim

et al. 2015

Biomed. Opt. Express

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Abstract:In this work, we demonstrate that ultrafast laser irradiation could selectively disrupt vascular endothelium of zebrafish embryos in vivo. Ultrafast lasers minimize the collateral damage in the vicinity of the laser focus and eventually reduce coagulation in the tissues. We have also found that the threshold fluence for lesion formation of the vascular endothelium strongly depends on the developmental stage of the embryos. The threshold laser fluence required to induce apparent lesions in the vascular structure for Somite 14, 20 and 25 stages is about 5 J/cm 2 ~7 J/cm 2 , which is much lower than that for the later development stages of Prim 16 and Prim 20 of 30 J/cm 2 ~50 J/cm 2 . The proposed method for treating the vascular cord of zebrafish embryos in the early stage of development has potential as a selective and effective method to induce a fatal lesion in the vascular endothelium without damaging the developed blood vessels. Optimal parameters for exogenous material delivery, and the laser's effect on short-and long-term development," BMC Biotechnol. 8(1), 7 (2008). 18. M.

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Dynamic changes in PDMS surface morphology in femtosecond laser treatment

Cited by 10 publications

References 18 publications

Laser ablation of polymers: a review

Laser ablation of polymers: a review

Poisson’s ratio measurement through engraving the grid pattern inside poly(dimethylsiloxane) by ultrafast laser

Selective disruption of vascular endothelium of zebrafish embryos by ultrafast laser microsurgical treatment

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