Surface Structuring of Kapton Polyimide With Femtosecond and Picosecond Ir Laser Pulses

Hrabovský, Ján; Liberatore, C.; Mirza, Inam; Sládek, Juraj; Beránek, Jaroslav; Bulgakov, Alexander V.; Bulgakova, Nadezhda M.

doi:10.1615/interfacphenomheattransfer.2019031067

Cited by 6 publications

(5 citation statements)

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“…It is important to note, that advanced industrial laser systems provide currently processing rates up to 1 m 2 s −1 , thus enabling mass production of multifunctional metal, semiconductors, glasses, and polymer materials [ 32 ]. Although there is a general consensus that femtosecond lasers outperform other lasers in terms of nanostructuring capability and controllability [ 31 , 39 , 40 , 76 ], less expensive picosecond and nanosecond lasers can be also used for surface nano/microstructuring [ 77 , 78 , 79 ]. Low-cost mass production of nano/microstructured polymer and other soft materials for low-temperature HMXs can be also implemented using nanoimprinting technology, where a femtosecond laser is utilized for producing a mold and then the nano/microstructures fabricated on the mold are replicated on a soft material [ 80 , 81 ].…”

Section: Resultsmentioning

confidence: 99%

Evaporative and Wicking Functionalities at Hot Airflows of Laser Nano-/Microstructured Ti-6Al-4V Material

et al. 2023

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A novel multifunctional material with efficient wicking and evaporative functionalities was fabricated using hierarchical surface nano-/microstructuring by femtosecond laser micromachining. The created material exhibits excellent multifunctional performance. Our experiments in a wind tunnel demonstrate its good wicking and evaporative functionalities under the conditions of high-temperature airflows. An important finding of this work is the significantly enhanced evaporation rate of the created material compared with the free water surface. The obtained results provide a platform for the practical implementation of Maisotsenko-cycle cooling technologies for substantially increasing efficiency in power generation, thermal management, and other evaporation-based technologies. The developed multifunctional material demonstrates long-lasting wicking and evaporative functionalities that are resistant to degradation under high-temperature airflows, indicating its suitability for practical applications.

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Section: Resultsmentioning

confidence: 99%

Evaporative and Wicking Functionalities at Hot Airflows of Laser Nano-/Microstructured Ti-6Al-4V Material

et al. 2023

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“…Among the other fields, surface structuring has benefited greatly from the usage of fs lasers [ 6 ]. Here, it allows one to achieve true hierarchical surface features on a large variety of substrates such as various metals [ 7 ], glasses [ 8 ], or polymers [ 9 ]. Therefore, it comes as no surprise that surfaces made using a fs light source have been tested in a vast array of applications including self-cleaning [ 10 ], anti-icing [ 11 ], anti-fouling [ 12 ], photonics, and bionics [ 13 , 14 ], to name a few.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS2-Based Hydrogen Evolution Reaction Electrocatalyst

Levinas

Grigucevičienė

Kubilius³

et al. 2022

Materials

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One of the methods to improve the performance of a heterogeneous electrocatalyst is the dispersion of a catalytic material on a suitable substrate. In this study, femtosecond laser ablation was used to prepare very rough but also ordered copper surfaces consisting of vertical, parallel ridges. Then, a molybdenum sulfide coating was electrochemically deposited onto these surfaces. It was observed by profilometry that the average roughness of the surface after coating with MoS2 had decreased, but the developed surface area still remained significantly larger than the projected surface area. The electrodes were then used as an electrocatalyst for the hydrogen evolution reaction in acidic media. These were highly efficient, reaching 10 mA cm−2 of HER current at a −181 mV overpotential and a Tafel slope of ~39 mV dec−1. Additionally, scanning electrochemical microscopy was used to observe whether hydrogen evolution would preferentially occur in certain spots, for example, on the peaks, but the obtained results suggest that the entire surface is active. Finally, the electrochemical impedance spectroscopy data showed the difference in the double-layer capacitance between the ablated and non-ablated surfaces (up to five times larger) as well as the parameters that describe the improved catalytic activity of fs-Cu/MoS2 electrodes.

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“…Short and ultra-short pulse laser irradiation of polymers can cause laser ablation resulting from the decomposition of the material due to disintegration of hydrocarbon chains. Laser ablation is a well-established tool for surface patterning, structuring and modification of polymer films and foils [2][3][4][5][6][7][8][9]. The ablation process was already studied for different polymers like polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK), polyethylene terephthalate (PET) and polycarbonate (PC) [2,10].…”

Section: Introductionmentioning

confidence: 99%

“…Polyimide (PI) is a well-qualified polymer for various applications due to its exceptional optical, chemical, thermal and electrical properties [10]. The laser ablation process of PI was studied for very different laser sources with pulse durations from femtosecond (fs) to nanosecond (ns) and with wavelengths ranging from infrared to ultraviolet [4,7,8,[11][12][13][14][15][16]. The ablation of polymers can be of photothermal or photochemical nature [5]; both cause finally the decomposition of the polymer and the formation of gaseous products.…”

Section: Introductionmentioning

confidence: 99%

“…3)) (c) Front side hole diameter df and rear side hole diameter db on the polyimide foil at a laser pulse energy E = 12.3 µJ dependent on the number of laser pulses N (black and red line fit based on Eq. 6-8) (d) Front side hole diameter df and rear side hole diameter db of the polyimide foil at a number of laser pulses of N = 1000 dependent on the laser pulse energy E (black and red line fit based on Eq [6][7][8].…”

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confidence: 99%

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High Pore Density Polyimide Membrane Production by PS Laser Pulses

2022

JLMN

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High pore density membranes exhibit various applications, especially in microfiltration, bioseparation, microbiology and medicine. The laser ablation process allows the fabrication of membranes with high pore density and pore diameter in the µm and sub-µm range. Ultrashort laser pulses allows the efficient and precise fabrication of pores in polymer foils due to the high repetition rate and the low thermal effects. Polyimide (PI) foils with a thickness of 13 µm were irradiated by ultraviolet picosecond laser radiation. The fabricated membranes have a pore diameter from ~0.7 µm to 75 µm in dependence on the laser parameter. Furthermore, high pore density up to ~23500 mm -2 , high-precision pores with standard deviation of pore diameter less than 10 % and high areal pore density up to ~12 % were achieved. The detailed analysis of the pore size at the front and rear side in correlation to the laser parameter enable an empiric description of the pore size -laser parameter dependency which allows the optimisation of the pore density.

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Surface Structuring of Kapton Polyimide With Femtosecond and Picosecond Ir Laser Pulses

Cited by 6 publications

References 0 publications

Evaporative and Wicking Functionalities at Hot Airflows of Laser Nano-/Microstructured Ti-6Al-4V Material

Evaporative and Wicking Functionalities at Hot Airflows of Laser Nano-/Microstructured Ti-6Al-4V Material

Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS2-Based Hydrogen Evolution Reaction Electrocatalyst

High Pore Density Polyimide Membrane Production by PS Laser Pulses

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