Article
Engineering, Electrical & Electronic
Felipe Oliveira Barino, Renato Faraco-Filho, Deivid Campos, Vinicius N. H. Silva, Andres P. Lopez-Barbero, Leonardo de Mello Honorio, Alexandre Bessa dos Santos
Summary: The use of a long-period fiber grating (LPG) array to monitor the loading condition of a structure has shown high accuracy in estimating force position and intensity. This method was tested on a simply-supported beam model and provides a new approach for real-time structural health monitoring.
IEEE SENSORS JOURNAL
(2021)
Article
Multidisciplinary Sciences
Jin Hae Kim, Hyokeun Park, Tae-Gon Kim, Hyunmi Lee, Shinae Jun, Eunha Lee, Woo Sung Jeon, Jaegwan Chung, In-Sun Jung
Summary: Colloidal quantum-dots are attractive for optoelectronic applications due to their easy maneuverability, high functionality, wide applicability, and low cost. A new method has been developed to disrupt the interaction between the inorganic particle and organic ligands on the surface of QDs, facilitating accurate analysis of the ligands.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Siriporn Anuthum, Fugo Hasegawa, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Kontad Ounnunkad, Akira Baba
Summary: The study demonstrates the fabrication of plasmonic photothermal silver nanoparticle grating films, which can effectively convert light into heat. Compared with the reference evaporated silver film, the grating film generates significantly higher heat under solar light.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Industrial
Chao Wang, Duc Truong Pham, Chunbiao Wu, Jae-woong Kim, Shizhong Su, Zhenqian Jin
Summary: This study introduces the artificial thermal strain (ATS) method for analyzing the distortion mechanism in laser bending processes. Results show that the reduction in bending angle under low line energy is mainly determined by the size of the inherent strain area. The ATS method proves effective in predicting thermal distortion with a simplified plastic finite element model.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Thorsten Fischer, Jan Tenbusch, Martin Moeller, Smriti Singh
Summary: The use of polymeric materials with controlled surface properties is important in biomedical applications. This study presents a method to graft highly stable, ultra-thin, amine-functional hydrogel layers onto inert surfaces of certain polymers. The covalently bound surface layers resist extraction and exhibit both hydrophobic and hydrophilic wetting behavior.
Article
Engineering, Electrical & Electronic
Yihong Sun, Xiaolin Gong, Jianli Li, Zhuangsheng Zhu, Zhanchao Liu, Chunyu Qu, Xiaoshuang Ding
Summary: The airborne Distributed Position and Orientation System (DPOS) relies on the main node to perform transfer alignment for sub-nodes to obtain high-precision motion data, which requires accurate deformation data and the relative motion relationship between different nodes. By using a high-precision time synchronization method based on waveform matching, high-precision time synchronization can be achieved, providing a prerequisite for transfer alignment.
IEEE SENSORS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Young-Rae Kim, Jineun Lee, Heesang Kim, Young-Jae Jin, Wang-Eun Lee, Giseop Kwak
Summary: Polyamideimides and polyimides are prepared through chemical imidization using aromatic diamine, diacid anhydride, and diacid chloride as monomers. The resulting films exhibit unidirectional fracture behavior and consist of a double layer. The residual polyamic acid undergoes degradation exclusively on the air contact surface. Laminating the polymer film with glass results in a laminated glass that can withstand bending towards the air contact surface but easily breaks in the opposite direction, indicating potential application in emergency safety glasses.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Yiwei Ma, Zizhao Dai, Chunbo Su, Tian Tian, Zhihai Liu, Weimin Sun, Tao Geng
Summary: In this study, a novel fiber grating sensor based on symmetrical polished fiber plane is designed and experimentally tested. By using CO2-laser polishing and oxyhydrogen flame heating, periodic bending cores are achieved on a symmetrical polished plane, which greatly enhances the sensitivity of the structure. The experimental results demonstrate that the proposed sensor has a high strain sensitivity of -0.846 nm/με and a temperature sensitivity of 236 pm/°C.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Chemistry, Physical
Ryo Taguchi, Kohei Kuwahara, Norihisa Akamatsu, Atsushi Shishido
Summary: This study successfully determined the curvatures that cause the bending hysteresis by precisely monitoring bending curvatures, and found that these curvatures depend on film thickness. Furthermore, the occurrence of bending hysteresis can be explained by bending strains with a nonlinear relation with internal stresses.
Article
Engineering, Chemical
Ke Yan, Dong Chen, Li Wang, Wantai Yang
Summary: The shelf life of antifog polyethylene (PE) films can be enhanced by delaying the migration of antifogging agents using polymer microspheres.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Ryo Taguchi, Norihisa Akamatsu, Kohei Kuwahara, Kayoko Tokumitsu, Yoshiaki Kobayashi, Masayuki Kishino, Keita Yaegashi, Jun Takeya, Atsushi Shishido
Summary: The study introduces a surface-labeled grating method for measuring surface bending strains in materials accurately and without the need for additional material information. By reducing surface bending strains, the fracture limit of hard coatings on flexible substrates was successfully determined.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Phuong Huyen Nguyen, Duc Hieu Nguyen, Donghyoung Kim, Mun Kyoung Kim, Jiseong Jang, Woo Hyeong Sim, Hyung Mo Jeong, Gon Namkoong, Mun Seok Jeong
Summary: This study investigates the regeneration of oxidized titanium carbide (Ti3C2Tx) through hydrofluoric acid (HF) post-treatment. The research reveals that the post-treatment can restore the structure and surface composition of MXene nanosheets, thereby improving their electrical conductivity and prolonging their conductivity maintenance time. This finding is crucial for the rational design of Ti3C2Tx-based devices and functional coatings.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Geological
Tianmin Wang, Jianhong Ye
Summary: This study investigates the stress and strain distributions of bi-modulus materials in bending tests using a constitutive model and numerical methods. A new method for simultaneously measuring the tensile and compressive elastic moduli of materials is proposed.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Jan-Willem Burssens, Appo van der Wiel, Michael Kraft
Summary: The literature often lacks the measurement of piezoelectric properties in the processing of these materials. Current methods for characterizing piezoelectric constants on unstructured thin films are limited, and do not include the important lateral piezoelectric coefficient e(31,f). This article introduces a new method to measure the lateral piezoelectric coefficient on unstructured wafers, using wafer bending to generate charge and calculate the piezoelectric constant. The method shows good correlation with the four-point bending method and requires less stringent measurement equipment.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Multidisciplinary
Woomin Park, Seungbeom Park, Yeongjun Mun, Dongchan Lee, Kwang-Suk Jang
Summary: A thickness-controlled fabrication method for obtaining flexible, free-standing Ag2Se films with nanostructured raw materials was proposed in this study. By introducing the post-annealing process, flexible, free-standing Ag2Se films can be obtained. The flexibility and thermoelectric performance of the films were systematically investigated, and it was found that films with thicknesses of 110 μm or less exhibited excellent flexible properties.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Kaho Ogata, Kohsuke Matsumoto, Yoshiaki Kobayashi, Shoichi Kubo, Atsushi Shishido
Summary: In this study, we achieved the uniform alignment of zinc oxide nanorods by grafting nematic liquid crystal (LC) polymers onto their surfaces, taking advantage of the cooperative motion of LCs.
Article
Nanoscience & Nanotechnology
Ryo Taguchi, Aki Fujisawa, Masayuki Kishino, Kohei Kuwahara, Norihisa Akamatsu, Motoyuki Fukuhara, Atsushi Shishido
Summary: In this study, the classical beam theory is validated to accurately analyze the surface bending strains of polymer films using a surface-labeled grating method. The experimental analysis reveals the differences in bending strain characteristics between single-layer and double-layer films.
Article
Chemistry, Multidisciplinary
Zixuan Deng, Hang Zhang, Arri Priimagi, Hao Zeng
Summary: This study reports an optically powered soft material strip that can perform nonreciprocal, cilia-like, self-sustained oscillation under water. The actuator is made of planar-aligned liquid crystal elastomer responding to visible light. Two laser beams from orthogonal directions allow for piecewise control over the strip deformation, enabling two self-shadowing effects coupled in one single material to yield nonreciprocal strokes. The results demonstrate autonomous microfluidic pumping, translocation of a micro-object, and coupling between two oscillating strips through liquid medium interaction, offering new concepts for non-equilibrium soft actuators that can perform bio-like functions under water.
ADVANCED MATERIALS
(2023)
Article
Engineering, Mechanical
Masayuki Kishino, Kohsuke Matsumoto, Yoshiaki Kobayashi, Ryo Taguchi, Norihisa Akamatsu, Atsushi Shishido
Summary: In this study, the fatigue life of bending polymer films was predicted using machine learning. The random forest model showed accurate and efficient predictions of fatigue life, with a mean absolute percentage error of 22.3% within 1 minute. This contributes to the development of flexible devices.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
Sayuri Hashimoto, Norihisa Akamatsu, Yoshiaki Kobayashi, Kyohei Hisano, Miho Aizawa, Shoichi Kubo, Atsushi Shishido
Summary: Precise control of polymer surface topographies is crucial for developing high-performance materials and devices. A novel method using structured light to trigger mass transport in liquid crystal photopolymerization demonstrates the direct formation of microscale well and canal structures on polymer film surfaces. Real-time observations show that anisotropic molecular diffusion during photopolymerization leads to directed molecular alignment and surface structure formation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Qing Liu, Yu Zhou, Ahmed Shaukat, Zhuojun Meng, Daniella Kyllonen, Iris Seitz, Daniel Langerreiter, Kim Kuntze, Arri Priimagi, Lifei Zheng, Mauri A. Kostiainen
Summary: In this article, a light-controlled protein crystal is introduced, which is obtained by complexing the model proteins with cationic azobenzene dyes. The crystalline state can be switched to a dispersed phase under ultraviolet light and restored by visible-light illumination, and this switching can be repeated without structure deterioration. This approach significantly increases the crystallinity and enables the formation of protein single crystals. It offers a method for fabricating optically controlled crystallization and studying metamaterials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Multidisciplinary Sciences
Klaudia Dradrach, Michal Zmyslony, Zixuan Deng, Arri Priimagi, John Biggins, Piotr Wasylczyk
Summary: Researchers demonstrate the use of light-driven pumping for small-scale manipulation of microlitre volumes of liquid using a liquid crystal elastomer strip. Optofluidics, which utilizes light for power and control, offers the potential for small, self-contained microfluidic devices that are more efficient and simpler to operate.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Matias Paatelainen, Markus Lahikainen, Alex Berdin, Kim Kuntze, Werner M. Nau, Nonappa, Arri Priimagi
Summary: Supramolecular host-guest complexes are dynamic systems consisting of macrocyclic host molecules encapsulating smaller guest molecules, and can be used to tackle fluorescence quenching and photobleaching. This study demonstrates the application of supramolecular host-guest complexation in a hydrogel network to create tunable hydrogel-based lasers. By doping hydrogel with cucurbit[7]uril as a host molecule, the fluorescent quantum yield and photostability of Rhodamine B molecules in the hydrogel are significantly improved. A thin-film distributed feedback hydrogel laser with wavelength tunability is fabricated to showcase the concept. These findings, combined with the stimuli-response of hydrogels, open up possibilities for affordable and small-scale photonic devices for sensing applications.
ADVANCED OPTICAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Natalie P. Pinchin, Hongshuang Guo, Henning Meteling, Zixuan Deng, Arri Priimagi, Hamed Shahsavan
Summary: Soft robots, composed of compliant materials like liquid crystal networks (LCNs), offer high adaptability and safer interaction with humans. However, the relationship between LCNs and water poses limitations in aquatic environments. This review examines this relationship, surveys existing literature on LCNs as aquatic soft robots, and discusses potential paths forward.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Masayuki Kishino, Kyohei Hisano, Yusho Kishimoto, Ryo Taguchi, Atsushi Shishido
Summary: In this study, the bending fatigue behavior of various polymer films was quantitatively investigated using a newly developed multifunctional bending fatigue tester. It was found that the polymer structures affected the surface bending strain and fracture modes, while heat accumulation under high-rate cyclic bending led to thermal degradation and shortening of the fatigue life. These findings provide valuable insights into the fatigue behavior and life of polymer films, facilitating the development of flexible electronic devices and soft robots.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Kim Kuntze, Daisy R. S. Pooler, Mariangela Di Donato, Michiel F. Hilbers, Pieter van der Meulen, Wybren Jan Buma, Arri Priimagi, Ben L. Feringa, Stefano Crespi
Summary: We introduce a new class of visible-light-driven molecular motors based on barbituric acid, which possess a tertiary stereogenic center with a hydroxy group due to an unexpected reactivity during synthesis. Experimental and computational studies reveal that these motors operate similarly to existing overcrowded alkene-based molecular motors, with a sub-picosecond excited-state isomerization facilitated by a hydrogen bond between the hydroxy group and the carbonyl groups. Computational simulations predict a high quantum yield of isomerization (68%) through an excited state lasso mechanism.
Article
Chemistry, Multidisciplinary
Kim Kuntze, Jani Viljakka, Matti Virkki, Chung-Yang (Dennis) Huang, Stefan Hecht, Arri Priimagi
Summary: By simple synthetic derivatisation, indigo dye can be converted into a red-light E-Z photoswitch, which exhibits negative photochromism and tuneable thermal isomerisation kinetics. This makes indigo derivatives highly attractive for materials and living systems applications. However, the translation of indigo photoswitching dynamics from solution to solid state, which is crucial for most applications, is not well understood. In this study, the photoswitching performance of six structurally distinct indigo derivatives in five polymers of varying rigidity is investigated. Three key strategies are identified to enable efficient photoswitching under red light: choosing a soft polymer matrix, creating free volume around the indigo molecules, and applying low dye loading to inhibit aggregation. Implementation of these strategies leads to isomerisation performance nearly identical to that in solution, paving the way for designing new red-light photochromic materials based on indigos.
Article
Chemistry, Multidisciplinary
Heidi Peussa, Chiara Fedele, Huy Tran, Mikael Marttinen, Julia Fadjukov, Elina Maentylae, Arri Priimaegi, Soile Nymark, Teemu O. Ihalainen
Summary: Epithelial cells interact with their extracellular environment through continuous biochemical and physical interactions, which guide physiological processes. This study demonstrates that light-responsive materials can modify the physical niche of cells and trigger rapid intracellular calcium transients. Moreover, the research reveals that the mechanosensitive cation channel Piezo1 plays a major role in generating these transients after nanoscale mechanical deformation. The findings also show that Piezo1 preferentially responds to shear deformation at the cell-material interphase rather than absolute topographical changes of the substrate.
