Capillary Nylon 6 polymer material produced by femtosecond laser processing

Fang, Ranran; Zhu, Heyuan; Li, Zekai; Yan, Wensheng; Zhang, Xianhang; Zhu, Xiaohui; Maisotsenko, Valeriy; Vorobyev, A. S.

doi:10.1364/oe.27.036066

Cited by 9 publications

(9 citation statements)

References 55 publications

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“…However, all the studied samples exhibit some loss of their blackness after contact with hot water, indicating a degradation of light absorption properties caused by AlO(OH) surface layer formation. This value of the maximum spreading velocity exceeds those that have been previously observed in 1D microgroove structures (370 mm/s in [85] and 120 mm/s in [100]). Using the same approach for identifying the inertial regime as in [64,85], we find in our study that the inertial regime, where the spreading distance is a quasilinear function of time, lasts until about 70 ms. Snapshots a1, b1, b2, b3, b4, c1, c2, and c3 illustrate the water spreading in the time domain 0 < t < 90 ms.…”

Section: Resultscontrasting

confidence: 42%

Superwicking Functionality of Femtosecond Laser Textured Aluminum at High Temperatures

et al. 2021

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An advanced superwicking aluminum material based on a microgroove surface structure textured with both laser-induced periodic surface structures and fine microholes was produced by direct femtosecond laser nano/microstructuring technology. The created material demonstrates excellent wicking performance in a temperature range of 23 to 120 °C. The experiments on wicking dynamics show a record-high velocity of water spreading that achieves about 450 mm/s at 23 °C and 320 mm/s at 120 °C when the spreading water undergoes intensive boiling. The lifetime of classic Washburn capillary flow dynamics shortens as the temperature increases up to 80 °C. The effects of evaporation and boiling on water spreading become significant above 80 °C, resulting in vanishing of Washburn’s dynamics. Both the inertial and visco-inertial flow regimes are insignificantly affected by evaporation at temperatures below the boiling point of water. The boiling effect on the inertial regime is small at 120 °C; however, its effect on the visco-inertial regime is essential. The created material with effective wicking performance under water boiling conditions can find applications in Maisotsenko cycle (M-cycle) high-temperature heat/mass exchangers for enhancing power generation efficiency that is an important factor in reducing CO2 emissions and mitigation of the global climate change.

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Section: Resultscontrasting

confidence: 42%

Superwicking Functionality of Femtosecond Laser Textured Aluminum at High Temperatures

et al. 2021

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“…Recently, novel wicking materials have been created using femtosecond laser nano/ microstructuring technology [12][13][14][15] based on the direct laser ablation [16][17][18][19][20]. It has been demonstrated that 1D array of open nanotextured microchannels produced on a silicon surface provides fast capillary flow of water over a long distance even against gravity [21].…”

Section: Introductionmentioning

confidence: 99%

Temperature Effect on Capillary Flow Dynamics in 1D Array of Open Nanotextured Microchannels Produced by Femtosecond Laser on Silicon

Fang

Zhu

et al. 2020

Nanomaterials

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Capillary flow of water in an array of open nanotextured microgrooves fabricated by femtosecond laser processing of silicon is studied as a function of temperature using high-speed video recording. In a temperature range of 23–80 °C, the produced wicking material provides extremely fast liquid flow with a maximum velocity of 37 cm/s in the initial spreading stage prior to visco-inertial regime. The capillary performance of the material enhances with increasing temperature in the inertial, visco-inertial, and partially in Washburn flow regimes. The classic universal Washburn’s regime is observed at all studied temperatures, giving the evidence of its universality at high temperatures as well. The obtained results are of great significance for creating capillary materials for applications in cooling of electronics, energy harvesting, enhancing the critical heat flux of industrial boilers, and Maisotsenko cycle technologies.

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“…These time domains correlate with water drop spreading and its shape changes affecting the water driving forces, as seen in Snapshots b1-b4 and in Figure 3e, with its associated Snapshots e1-e3 that demonstrate dynamics of the water drop profile on the sample. The plot of the spreading velocity as a function of time presented in Figure 3c shows significant velocity fluctuations that are explained by an uncertainty in velocity derivation and pinning/depinning effects [36,38,105]. The average velocity in the quasilinear regime (4 < t < 62 ms) is found to be 142 mm/s.…”

Section: Resultsmentioning

confidence: 95%

“…A typical wicking medium currently used in heat pipes for cooling electronics is a porous material (mesh or sintered powder), performance of which degrades at high heat fluxes because of insufficient liquid transport and large thickness of the wicking medium (>0.5 mm) that limit the heat transfer [30][31][32]. Hierarchical wicking materials based on the surface capillary effect offer significantly enhanced cooling performance due to a high velocity of liquid transport, small thickness (<100 µm), and efficient evaporative functionality [33][34][35][36][37][38]. Prior studies also show that as compared with wire meshes, sintered powders, and microgroove structures, the micropillar arrays [39,40], especially hierarchical ones [41,42], provide superior heat transfer performance due to their good wicking, large surface area enhancement, and high evaporation rate owing to a large thin-film evaporation area [41,43,44].…”

Section: Introductionmentioning

confidence: 99%

“…Prior studies also show that as compared with wire meshes, sintered powders, and microgroove structures, the micropillar arrays [39,40], especially hierarchical ones [41,42], provide superior heat transfer performance due to their good wicking, large surface area enhancement, and high evaporation rate owing to a large thin-film evaporation area [41,43,44]. Previously, surface nano/microstructuring of materials [34,45] using direct laser ablation [46][47][48][49][50] has been successfully applied to fabrication of superwicking silicon [36,51], metals [10,14,33,37,52], glasses [53,54], and polymers [38] by producing an array of parallel microgrooves on a surface of a material. It has been demonstrated that this open capillary surface structure provides a strong capillary force capable of unidirectional transporting of water for a long distance, even against the force of gravity.…”

Section: Introductionmentioning

confidence: 99%

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Spreading and Drying Dynamics of Water Drop on Hot Surface of Superwicking Ti-6Al-4V Alloy Material Fabricated by Femtosecond Laser

Fang

Zhang

et al. 2021

Nanomaterials

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A superwicking Ti-6Al-4V alloy material with a hierarchical capillary surface structure was fabricated using femtosecond laser. The basic capillary surface structure is an array of micropillars/microholes. For enhancing its capillary action, the surface of the micropillars/microholes is additionally structured by regular fine microgrooves using a technique of laser-induced periodic surface structures (LIPSS), providing an extremely strong capillary action in a temperature range between 23 °C and 80 °C. Due to strong capillary action, a water drop quickly spreads in the wicking surface structure and forms a thin film over a large surface area, resulting in fast evaporation. The maximum water flow velocity after the acceleration stage is found to be 225–250 mm/s. In contrast to other metallic materials with surface capillarity produced by laser processing, the wicking performance of which quickly degrades with time, the wicking functionality of the material created here is long-lasting. Strong and long-lasting wicking properties make the created material suitable for a large variety of practical applications based on liquid-vapor phase change. Potential significant energy savings in air-conditioning and cooling data centers due to application of the material created here can contribute to mitigation of global warming.

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Capillary Nylon 6 polymer material produced by femtosecond laser processing

Cited by 9 publications

References 55 publications

Superwicking Functionality of Femtosecond Laser Textured Aluminum at High Temperatures

Superwicking Functionality of Femtosecond Laser Textured Aluminum at High Temperatures

Temperature Effect on Capillary Flow Dynamics in 1D Array of Open Nanotextured Microchannels Produced by Femtosecond Laser on Silicon

Spreading and Drying Dynamics of Water Drop on Hot Surface of Superwicking Ti-6Al-4V Alloy Material Fabricated by Femtosecond Laser

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