Design, manufacturing and experimental validation of a bonded dual-component microstructured system for vertical light emission

Jakubowsky, Michael; Werder, Jerome; Rytka, Christian; Kristiansen, Per Magnus; Neyer, A.

doi:10.1007/s00542-020-04767-z

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…This material-dependent shift in trapping position can be explained by the bonding procedure. More specifically, we use UV/O 3 at 172 nm to induce the formation of polar functional groups and reduce the polymer molecular weight at the surface (for PMMA). − Due to the short wavelength, the penetration depth into the material is only a few hundred nanometers depending on processing conditions . This leaves the bulk of the material unaffected and enables thermal bonding below the glass transition temperature of the material without significant channel deformation or height loss.…”

Section: Resultsmentioning

confidence: 99%

Injection Molding of Thermoplastics for Low-Cost Nanofluidic Devices

Mortelmans

Kazazis

Werder

et al. 2022

ACS Appl. Nano Mater.

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Thermoplastic micro- and nanofluidics are increasing in popularity due to their favorable chemical and physical properties as an alternative to poly(dimethyl siloxane) (PDMS)-based devices, which are more widely used in academia. Additionally, their fabrication is compatible with industrial processes, such as hot embossing and injection molding. Nevertheless, producing devices with sub-micrometer channel heights and low roughness while retaining high-throughput molding remains challenging. This article details the combination of grayscale e-beam lithography (g-EBL) and injection molding as a fabrication route for capillary 3D thermoplastic nanofluidic devices with unprecedented accuracy in the sub-micrometer range. We employed g-EBL to pattern the device profile in a poly(methyl methacrylate) (PMMA)-based resist, which served as a substrate for the subsequent fabrication of a negative nickel mold by using electroforming. These molds are used to fabricate devices in PMMA and cyclic olefin polymers (COP) using injection molding. We show that the 3D height profile of the nanofluidic devices is maintained throughout the entire replication cycle within very tight tolerances, retaining its nanoscale topography on a millimeter-length scale. Moreover, somewhat surprisingly, the roughness in the inflow section of the devices was significantly reduced, which we attribute to the nickel mold fabrication. Last, we show that the capillary-driven devices can be used to size-dependently trap nanoparticles of various sizes in a reliable and facile manner while only requiring a 4 μL sample volume. The presented device and fabrication procedure paves the way for applications in various scientific fields, ranging from immunology to neurology and material science, in a cost-effective manner.

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Section: Resultsmentioning

confidence: 99%

Injection Molding of Thermoplastics for Low-Cost Nanofluidic Devices

Mortelmans

Kazazis

Werder

et al. 2022

ACS Appl. Nano Mater.

Self Cite

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“…Yu et al [ 21 ] analyzed the cylindrical micro-feature design of a front light LGP and concluded that the cylindrical convex micro-features arranged at the bottom surface of the LGP would provide an optimum effective contrast ratio. Jakubowsky et al [ 22 ] designed, simulated, and manufactured LGPs with undercut microstructures for vertical light emission on PMMA material using a variothermal injection molding process. The experimentally determined illumination performance characteristics (LID) and predictions based on optical simulations revealed good agreement for the LGPs they produced.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Melt Front Behavior of a Light Guiding Plate during the Filling Phase of Micro-Injection Molding

et al. 2022

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When the size of a liquid crystal display (LCD) increases, the light guiding plate (LGP) as the main part of the LCD must adopt a wedge-shaped plate to reduce its weight (the thickness of the LGP decreases because of this) and guide the light to the LCD screen. Micro-injection molding (MIM) is commonly used to manufacture LGPs. During the filling phase of MIM, the entire entering polymer melt front of the LGP should reach the end of the mold cavity at the same time. In this way, there will be no shrinkage or warpage of the LGP in its subsequent application, but it is difficult for the wedge-shaped LGP to meet these requirements. Therefore, the authors hoped to investigate MIM process parameters to change this situation. Otherwise, the LGP is easily deformed during the manufacturing process. Flow characteristics of LGPs were investigated during the filling phase of MIM in this study. Experimental and 3D numerical simulations were used to analyze the hysteresis, i.e., the advance of the polymer melt front of the LGP in MIM. Study results showed that a low injection speed caused a hysteresis effect of the plastic melt front, the solution was to increase the injection speed to improve the situation and an injection speed of 10 cm/s could achieve uniformity of the melt front in MIM. The research results showed that the filling situation of the LGP of MIM in the experiment was very close to that of the 3D numerical simulation.

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Façade elements for room illumination with integrated microstructures for daylight redirection and LED lighting

Jakubowsky

Boer

2022

Energy and Buildings

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Design, manufacturing and experimental validation of a bonded dual-component microstructured system for vertical light emission

Cited by 7 publications

References 18 publications

Injection Molding of Thermoplastics for Low-Cost Nanofluidic Devices

Injection Molding of Thermoplastics for Low-Cost Nanofluidic Devices

Analysis of Melt Front Behavior of a Light Guiding Plate during the Filling Phase of Micro-Injection Molding

Façade elements for room illumination with integrated microstructures for daylight redirection and LED lighting

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