Replication of Micro Laser Textures by Injection Molding

Hernández, P.; Murawko, A.; Martínez, J.; Peláez, G.; Ares, E.

doi:10.1016/j.proeng.2013.08.201

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…Considering the ease of creating patterns through mechanical machining, chemical etching and electroforming on metals, they represent materials that offer a high potential as templates. Moreover, there are numerous ways to create an aluminum surface having micro and/or nanostructures including chemical etching [16,17], anodization [18][19][20][21], boiling water [22,23], plasma treatment [22,24,25], laser ablation [26][27][28] and lithography [29][30][31]. Various solutions have been used for chemically etching aluminum surfaces.…”

Section: Introductionmentioning

confidence: 99%

Direct replication of micro-nanostructures in the fabrication of superhydrophobic silicone rubber surfaces by compression molding

Maghsoudi

Momen

Jafari

et al. 2018

Applied Surface Science

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We describe a simple method for fabricating superhydrophobic high temperature vulcanized (HTV) silicone rubber surfaces by direct replication using a compression molding system. The resulting rubber samples possessed micro-nanostructures on the surface. This micro-and nanoscale roughness produced a water contact angle of >160º and a contact angle hysteresis of <3º. The roughness patterns on chemically etched aluminum surfaces, which served as templates, were successfully replicated on the rubber surfaces. An antistiction coating applied to the template surface ensured that the rubber was completely removed during demolding and that the replicated micro-nanostructures on the silicone surface were preserved. Surface roughness of the aluminum templates was optimized at HCl concentrations of 15 wt.%, with a lower roughness value observed at acid concentrations above and below this value. The developed HTV silicone rubber surfaces also demonstrated a freezing delay and a self-cleaning capacity.

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Section: Introductionmentioning

confidence: 99%

Direct replication of micro-nanostructures in the fabrication of superhydrophobic silicone rubber surfaces by compression molding

Maghsoudi

Momen

Jafari

et al. 2018

Applied Surface Science

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“…Since the formation of a viscous or solidified layer hinders replication, it is widely recognized that replication is improved by raising melt injection temperature or cavity (insert) surface temperature . Raising these temperatures while keeping other parameters fixed will, however, reduce filling pressure.…”

Section: Replication Of Micro‐features In Injection Moldingmentioning

confidence: 99%

“…Raising injection speed increases pressures within the cavity during filling, and raises melt temperature due to viscous heating. Higher injection speed has generally been found to improve replication .…”

Section: Replication Of Micro‐features In Injection Moldingmentioning

confidence: 99%

“…A factor may be that air is trapped in or against transverse features, whereas it is more easily displaced ahead of the melt in parallel‐to‐flow features. In addition, the deformation required for the plastic to replicate transverse features may be larger, for example on the downstream side of raised ridges on the master .…”

Section: Replication Of Micro‐features In Injection Moldingmentioning

confidence: 99%

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Replication of surface micro‐features using variothermal injection molding: Application to micro‐fluidics

Pittman¹,

Wlodarski²

2017

Polymer Engineering & Sci

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We study injection molding of mesoscale items with µm‐scale surface features, namely micro‐fluidic channels, relating replication quality to process conditions. Using variothermal molding, the variables are the pre‐heat temperature of the cavity insert surface before melt injection and the mold cooling start time. Surface temperatures and in‐cavity melt pressures are continuously measured. Rounded upper corners of the micro‐channels are used as an index of replication quality. For polymethylmethacrylate the thickness of a layer with solid‐like properties (below 124°C) is calculated and used with pressures to interpret results. It is shown how improved replication correlates with low layer thickness at the end of the compression phase when pressures are at a maximum, and the necessity of properly timed cooling to lock in replication before melt pressures fall. Results show how the inter‐relationship of layer thickness and melt pressure is controlled by pre‐heat temperature and cooling switch‐on time. Delayed cooling can result in poorer replication, due to a retraction effect of the plastic. Too early cooling also reduces replication of parallel‐to‐flow features downstream of transverse features, and of the replication of transverse features on their downstream side. Good replication of 100 and 70 µm channels requires lower pre‐heat than 400 µm ones. POLYM. ENG. SCI., 58:1726–1738, 2018. © 2017 Society of Plastics Engineers

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“…Replication process is an indispensable step in various scientific and industrial processes such as CDs [28], texture or morphology replication [29], Substrate Conformal Imprint Lithography (SCIL) technology and in microelectronics [30]. Laser based microtexturing of surfaces also heavily relies on the replication process for large scale production of the textured surfaces.…”

Section: Polycarbonate As a Master: Replication Of Microtexture On Pdmsmentioning

confidence: 99%

Superhydrophobic microtextured polycarbonate surfaces

Bhagat

Gupta

2015

Surface and Coatings Technology

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Replication of Micro Laser Textures by Injection Molding

Cited by 8 publications

References 3 publications

Direct replication of micro-nanostructures in the fabrication of superhydrophobic silicone rubber surfaces by compression molding

Direct replication of micro-nanostructures in the fabrication of superhydrophobic silicone rubber surfaces by compression molding

Replication of surface micro‐features using variothermal injection molding: Application to micro‐fluidics

Superhydrophobic microtextured polycarbonate surfaces

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