Article
Polymer Science
Chih-Yuan Chang
Summary: A novel nonuniform heating method for hot embossing of polymers with multiscale microstructures was proposed in this study, allowing for the fabrication of high-quality polymer microstructure patterns through a single-step process. This technique has great potential for rapid and flexible fabrication of multiscale microstructure patterns on polymer substrates.
Article
Materials Science, Ceramics
Kangsen Li, Guihao Lian, Daohang Yan, Zhenlong Wang, Feng Gong
Summary: Glass hot embossing is a cost-effective method for manufacturing glass microstructures, but the spatial volume of the mold cavity affects the deformation behavior and final shape of the embossed glass. By using FIB, blind micro-hole array structures with different depths were fabricated as embossing templates to investigate the impact of spatial gas on the glass deformation mechanism. The experimental results showed that the spatial volume of the mold cavity greatly influenced the gas expansion energy and deformation height of glass microstructures during hot embossing.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Multidisciplinary
Jin Xie, Risen Wang, Lei Li
Summary: This study proposes an optical sensing method for real-time recognition of the size of two-level microstructures during hot embossing. Experimental comparison shows that green light provides the best response to micro-forming heights, and the Naive Bayes method can accurately identify microstructure sizes.
Article
Automation & Control Systems
Meng-Ting Wu, Ming-You Wu, Cheng-Hsien Wu
Summary: Optoelectronic components are becoming more complex and functional, and deep learning-based optimization (DLBO) system is used to improve replicability. The DLBO system, including data generator, model generator, and optimal factor generator, successfully predicts and determines the optimal process conditions to produce roll-to-roll UV embossed film with the best light guiding properties. The results show that the DLBO system produces light guide films with better optical qualities than the traditional Taguchi method.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Jae-Kang Kim, Nagaraj Krishna-Subbaiah, Yingdan Wu, Jongkuk Ko, Anitha Shiva, Metin Sitti
Summary: This article presents a two-step curing process to significantly improve the repeatability of the micropatterned flexible silicone molds in UV light curing based R2R systems. The mold repeatability is increased from tens of cycles to over 1000 cycles through this strategy, even for complicated 3D undercut geometries and highly adhesive microstructures.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Olli-Heikki Huttunen, Johanna Hiitola-Keinanen, Jarno Petaja, Eero Hietala, Hannu Lindstrom, Jussi Hiltunen
Summary: High-volume manufacturing of microstructures is crucial for commercial utilization and large-scale experimental research. Polydimethyl siloxane (PDMS) is widely used in academia for microfluidic test devices. This study demonstrates a reduced ambient pressure roll-to-roll imprinting process using PDMS, significantly reducing the number of bubble-induced defects in microstructures.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2023)
Article
Engineering, Aerospace
Pengju Wang, Zejun Chen, Hongtao Huang, Jianshu Lin, Boxin Li, Qing Liu
Summary: Ti/Al/Mg laminated composites were successfully fabricated by hot roll bonding, with the effects of rolling reduction on microstructural evolution and mechanical properties explored. The results demonstrated good interfacial bonding in the laminated sheets, with significant impact of rolling reduction on deformation inhomogeneity through the Al layer thickness.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Engineering, Electrical & Electronic
Cheng-Je Lee, Yu-Hsiang Hsu
Summary: This study demonstrates the feasibility of using a soft master to create deep or tall micropatterns in a COP film, verifying the possibility of using a soft hot embossing process to create micropatterns for thin-film microfluidic devices.
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Jaishree, A. Bhandari, N. Khatri, Y. K. Mishra, M. S. Goyat
Summary: Over the past few decades, superhydrophobic coatings (SHCs) have attracted scientists and researchers due to their wide range of applications in various fields. Different techniques have been attempted to fabricate SHCs, but most of them have limitations. The hot embossing (HE) technique, however, shows great potential in replicating micro-nanofeatures on polymeric surfaces. This review article focuses on the recent advancements in HE-operated polymeric SHCs and their applications.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Analytical
Justas Ciganas, Algimantas Bubulis, Vytautas Jurenas, Paulius Griskevicius, Arvydas Palevicius, Sigita Urbaite, Giedrius Janusas
Summary: Molding in thermoplastic polymers using ultrasonic hot embossing technology shows promise due to its high precision reproducibility. To analyze and apply the formation of polymer microstructures by this method, understanding the dynamic loading conditions is necessary. The Standard Linear Solid model (SLS) is commonly used to analyze viscoelastic properties, but has limitations in representing materials with multiple relaxations. Therefore, this study aims to extrapolate dynamic mechanical analysis data for a wide range of deformations and use the obtained data in microstructure formation simulations.
Article
Polymer Science
Dongwon Yun, Jong-Bong Kim
Summary: This study analyzes the hot embossing process of PMMA film using computational analysis method to quickly find the optimal process conditions. The developed constitutive model considers strain, strain rate, temperature-dependent stress and softening of the flexible film, accurately describing the behavior of PMMA materials. The proposed method allows for a precise analysis of the film change phenomenon during the hot embossing process.
Article
Materials Science, Ceramics
Shraddha Supreeti, Michael Fischer, Mathias Fritz, Jens Mueller
Summary: This paper presents a technique for transferring high-resolution microstructures from silicon substrates to LTCC. The method involves the formation of gold and copper patterns on silicon substrate through photolithography and electrodeposition, followed by hot embossing onto the top layer of LTCC tape. This distinctive method can be useful for several applications requiring high-resolution and superior electrical properties.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Cheng-Hsien Wu, Yu-Cheng Liou
Summary: Roll-to-roll technology is widely used for the production of optoelectronic products, and this study designed a composite light guide plate to replace traditional ones, significantly improving brightness and uniformity.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2021)
Article
Nanoscience & Nanotechnology
Patrick Weiser, Robin Kietz, Marc Schneider, Matthias Worgull, Hendrik Holscher
Summary: Superhydrophobic surfaces with the lotus effect can be achieved through structuring of polymer surfaces. This paper presents a continuous roll-to-roll process for the fabrication of thin polymeric films covered with nanofur from polypropylene, and demonstrates their application in oil spill cleanup.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Lihua Li, Jian Zhou
Summary: The newly developed hot embossing technique using CBG heating has been successfully applied in the fabrication of microlens arrays, showing high replication fidelity with some geometric warpage. By conducting thermo-mechanical coupled finite element modeling and trial simulations, an appropriate compensation curvature was determined to significantly decrease the warpage in re-embossed microlens arrays. This demonstrates the feasibility of a simulation-oriented compensation scheme to improve the quality of optics embossed by this innovative technique.