Article
Materials Science, Multidisciplinary
Chohei Pang, Kinwing Mak, Yu Alexander Tse, Hongyu Yu, Michael Yu Wang
Summary: This study develops a scalable roll-to-roll technique for fabricating controllable dry adhesives with wedge-shaped structures and designs parallel grippers for grasping everyday objects. The method is low-cost, simple, and effective, making it widely applicable in robotic manipulation tasks.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Engineering, Environmental
Yeon Soo Lee, Gyun Ro Kang, Min-Seok Kim, Da Wan Kim, Changhyun Pang
Summary: In this study, a double-layered adhesive patch with an octopus inspired architecture (d-OIA) coated with a soft elastomer was proposed, showing enhanced adhesive performance. The patch demonstrated improved adhesion against dry and rough underwater surfaces in the pulling direction. The soft elastomer coated on the elastic octopus-inspired patterns enabled high adaptability to rough surfaces. The patch maintained a vacuum state on rough skin even during frequent bending and stretching, and it successfully detected electrocardiograms (ECG) and electromyograms (EMG) signals in dry and sweaty conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Sangyul Baik, Gui Won Hwang, Siyeon Jang, Suyeon Jeong, Ki Hyun Kim, Tae-Heon Yang, Changhyun Pang
Summary: This study presents a simple electrothermally actuating transport device based on an octopus-inspired microsphere-embedded sucker, which offers enhanced adhesion on dry/wet surfaces and enables switchable attachments and detachments.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Nan Hong, Dmitry Kireev, Qishen Zhao, Dongmei Chen, Deji Akinwande, Wei Li
Summary: A roll-to-roll (R2R) dry transfer process is developed for large-scale graphene grown by chemical vapor deposition, achieving the lowest electrical sheet resistance ever reported among R2R dry transferred graphene samples. The scalability and uniformity of the R2R dry transferred graphene is demonstrated by successfully fabricating graphene-based field-effect transistors (GFETs) with near-zero doping level and improved gate leakage current. Field-effect mobility of the R2R dry transferred graphene is determined to be 205 +/- 36 cm(2) V-1.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Thanh Huy Phung, Anton Nailevich Gafurov, Inyoung Kim, Sung Yong Kim, Kyoung Min Kim, Taik-Min Lee
Summary: The development of technology has led to the increasing use of wireless and IoT devices, which demand rapid and efficient manufacturing processes. This study demonstrates the fabrication of an IoT device using roll-to-roll printing, reducing production time and costs. The successful deployment of IoT devices opens up the opportunity to expand roll-to-roll fabrication to other flexible and multilayer electronic applications.
SCIENTIFIC REPORTS
(2021)
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
Polymer Science
Thanh Huy Phung, Anton Nailevich Gafurov, Inyoung Kim, Sung Yong Kim, Kyoung Min Kim, Taik-Min Lee
Summary: This study proposes a fabrication process using R2R printing to create a hybrid device, solving challenges related to material processing efficiency, alignment, and vulnerability of the polymeric substrate. The device consists of insulating and conductive layers printed onto a PET film to produce the circuit. Additionally, a monitoring system was developed to collect and process data, advancing towards tools for big data analysis and forecasting.
Article
Chemistry, Physical
Arnoux Rossouw, Andrzej Olejniczak, Katarzyna Olejniczak, Boris Gorberg, Iliya Vinogradov, Olga Kristavchuk, Alexander Nechaev, Leslie Petrik, Willem Perold, Sergey Dmitriev
Summary: The feasibility of large-scale surface modification of polyethylene terephthalate track-etched membranes (TM) using industrial roll-to-roll planar magnetron sputtering of Ti and TiO2 was investigated in this study. The results showed that the sputtered coatings did not significantly change water permeability or reduce pore diameter, indicating that magnetron sputtering is a viable method for the large-scale fabrication of hybrid membranes based on TM.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Hao Zhang, Yongsheng Ji, Yonggang Yao, Long Qie, Zhiheng Cheng, Zhihao Ma, Xin Qian, Ronggui Yang, Chenghang Li, Yaqing Guo, Yifei Yuan, Haoyu Xiao, Haiping Yang, Jing Ma, Jun Lu, Yunhui Huang
Summary: Battery recycling is becoming increasingly important due to the widespread use of Li-ion batteries. Direct recycling methods have advantages of high-purity material recovery and lower environmental impact, but most methods are complex and have low yield. This study presents a transient recycling approach with high efficiency for battery materials, achieving a recovery ratio of over 97% and intact metal foil of nearly 100% through shock-type or rolled-over heating.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Review
Energy & Fuels
Juan F. Benitez-Rodriguez, Dehong Chen, Mei Gao, Rachel A. Caruso
Summary: Recent progress in engineering and fabrication optimization of hybrid perovskite solar cells has led to high power conversion efficiencies, but challenges remain in achieving high efficiency in large-area devices. Stability protocols and process optimization are crucial for commercialization.
Article
Biochemical Research Methods
Rachel M. Roller, Angela Rea, Marya Lieberman
Summary: Paper-based analytical devices (PADs) offer a low-cost, user-friendly platform for rapid point-of-use testing. The air-gap PAD, a wax printer alternative, consists of hydrophilic paper test zones affixed to a hydrophobic backing with double-sided adhesive. Roll-to-roll manufacturing enables large-scale production of air-gap PADs. In this study, we compare the performance of air-gap PADs with wax-printed ones, and report on a successful pilot-scale roll-to-roll production of air-gap PADs.
Article
Metallurgy & Metallurgical Engineering
Qing-lin Du, Chang Li, Xiao-hui Cui, Charlie Kong, Hai-liang Yu
Summary: Ultrafine-grained AA1060 sheets were fabricated via five-cycle accumulative roll bonding (ARB) and subsequent three-pass cold rolling or cryorolling, leading to further grain refinement. Lower rolling temperatures resulted in finer grain sizes, with cryorolled sheets exhibiting higher strength and ductility compared to cold-rolled sheets.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Nanoscience & Nanotechnology
Chen Zhang, Rui Chen, Wenliya Luo, Jincheng Wang, Dongyang Chen, Pengfeng Chen, Sirui Liu, Yu Xie, Wei Zhou, Tao Luo
Summary: In this study, a batch fabrication strategy is proposed for paper-based waterproof flexible pressure sensors using single-walled carbon nanotube coated tissue paper pieces. The pieces are bonded using roll-to-roll lamination, resulting in sensors with high stability, rapid response time, and a wide measurement range. These sensors can be used for human physiological signal detection, motion tracking, and drowning detection.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Nan Hong, Qishen Zhao, Dongmei Chen, Kenneth M. Liechti, Wei Li
Summary: A novel method to estimate the adhesion energy of as-grown graphene during the roll-to-roll dry transfer process is developed, and an energy balance model is established to derive the adhesion energy based on web tension and bending curvature measurements. Experimental results show that the adhesion energy of as-grown graphene on copper foil depends on the peeling front geometry and ranges from 1.22 J/m2 to 2.58 J/m2. This method is compatible with large-scale graphene transfer processes and can be used for monitoring and controlling.
Article
Nanoscience & Nanotechnology
Chen Zhang, Rui Chen, Wenliya Luo, Jincheng Wang, Dongyang Chen, Pengfeng Chen, Sirui Liu, Yu Xie, Wei Zhou, Tao Luo
Summary: We have developed a roll-to-roll lamination strategy for batch fabrication of paper-based waterproof flexible pressure sensors, which exhibit good consistency and reliability. This method allows for the rapid fabrication of waterproof sensors with high stability, fast response time, and wide measurement range, enabling applications in human physiological signal detection, motion tracking, and drowning detection.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Lenke Kocs, Mohammad H. Jilavi, Dirk Beckelmann, Bruno Schaefer, Alexander May, Marcus Koch, Peter W. de Oliveira
Summary: A new water-based silica sol was developed for single-layer anti-reflective coatings, reducing solvent waste. The coating exhibited excellent performance on glass substrates, with homogenous layer thickness distribution and good surface wetting.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Angelika Gedsun, Riad Sahli, Xing Meng, Rene Hensel, Roland Bennewitz
Summary: The study found that tactile perception of fibrillar surfaces is influenced by the bending of fibrils, rather than the independent perceived variations of material stiffness and surface structure. Visual observation during tactile exploration can enhance the perception of fibril bendability.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Yue Wang, Xuan Zhang, Rene Hensel, Eduard Arzt
Summary: Robotic handling and transfer printing of micrometer-sized superlight objects is a crucial technology in industrial fabrication. The experiments demonstrated the reliable release of superlight objects using slanted deformable polymer microstructures. The analysis of forces and moments at the tip of the microstructure led to an expression for the pull-off force and provided guidance for optimized design.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Multidisciplinary Sciences
Yue Wang, Zhengwei Li, Mohamed Elhebeary, Rene Hensel, Eduard Arzt, M. Taher A. Saif
Summary: This study uses a novel microcup to reveal the mechanisms of its attachment and detachment underwater. The cup utilizes elasticity-enhanced hydrodynamics to generate self-sealing and high suction, effectively turning water into glue. The study also identifies three mechanisms of cup breaking and develops a mathematical model to describe the interplay between attachment and detachment.
Article
Nanoscience & Nanotechnology
Gabriela Moreira Lana, Xuan Zhang, Christian Mueller, Rene Hensel, Eduard Arzt
Summary: The study investigated the superior adhesion of film-terminated fibrillar microstructures in contact with surfaces of skin-like roughness, showing potential applications in wearable electronics and wound dressing.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Engineering, Aerospace
Mohamed Khalil Ben-Larbi, Rene Hensel, Gianfranco Atzeni, Eduard Arzt, Enrico Stoll
Summary: Spaceflight is facing a sustainability problem due to the large number of non-functional man-made objects in Earth orbit. Active debris removal technologies have been proposed, but their complexity and cost have hindered their implementation. Micropatterned dry adhesives inspired by climbing animals offer a new approach for docking and capturing non-cooperative targets, which can potentially reduce complexity and mission cost. This article reviews recent developments in the use of micropatterned dry adhesives for space applications, specifically in active debris removal, and discusses open issues for future work.
PROGRESS IN AEROSPACE SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Lena Barnefske, Fabian Rundel, Karsten Moh, Rene Hensel, Xuan Zhang, Eduard Arzt
Summary: Switchable micropatterned adhesives have great potential as resource-efficient grippers in future pick-and-place systems. The release phase during placing has received little research attention. New microfibrillar designs with high switching ratios in directional buckling are reported in this work. In situ optical observation shows that these micropatterns can successfully release small objects with high placement accuracy.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Multidisciplinary Sciences
Xuan Zhang, Yue Wang, Zhihao Tian, Manar Samri, Karsten Moh, Robert M. McMeeking, Rene Hensel, Eduard Arzt
Summary: Inspired by the trigger plant, this study explores a mechanical metastructure for overcoming adhesion using a spring lock mechanism. Reversible miniaturized snap-through devices are successfully realized by micron-scale direct printing, allowing for successful pick-and-place handling of micro-objects. This technique is applicable in various scenarios and surface conditions.
Article
Materials Science, Multidisciplinary
Christian Mueller, Manar Samri, Rene Hensel, Eduard Arzt, Martin H. Mueser
Summary: Viscoelasticity and small-scale, elastic multistability are two mechanisms that contribute to adhesion hysteresis. This study compares the simulated and experimental results of the interfacial force and contact area evolution between a soft elastomer and a rigid punch with roughness. The findings reveal that hysteresis is enhanced when the topography's saddle points come into contact, but is impeded by viscoelastic forces and may require large preloads. This coaction of viscous and multistability effects is relevant to macroscopic polymer contacts and adhesive gripping devices.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Manar Samri, Jonathan Thiemecke, Rene Hensel, Eduard Arzt
Summary: This article proposes an in-situ optical monitoring system coupled with image processing and machine learning for evaluating the application of bioinspired fibrillar adhesives in gripping systems. The experimental results show that the system can accurately predict the success rate of attachment for objects of different masses, thus improving the reliability of object handling.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Proceedings Paper
Computer Science, Cybernetics
Maja Fehlberg, Kwang-Seop Kim, Knut Drewing, Rene Hensel, Roland Bennewitz
Summary: This study explores the perception of friction in tactile perception and finds that people can perceive subtle differences in friction. In addition, the study also finds that there is a negative correlation between perception of friction and tactile pleasantness.
HAPTICS: SCIENCE, TECHNOLOGY, APPLICATIONS, EUROHAPTICS 2022
(2022)
