Article
Engineering, Electrical & Electronic
Ryotaro Konoike, Keijiro Suzuki, Hitoshi Kawashima, Kazuhiro Ikeda
Summary: The proposed port-alternated switch-and-select architecture for planar waveguide-based optical switches reduces the number of intersections on a path, leading to small insertion loss and path dependence. An 8 x 8 optical switch based on this architecture demonstrated on a silicon photonic platform exhibited a fiber-to-fiber insertion loss of 5.7 dB with crosstalk below -30 dB. The scalability of the switch, including propagation and bend losses of the waveguides, was also discussed.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
Ke Xiao, Chen-Xu Wu
Summary: In this study, an effective theoretical model was proposed and successfully derived the dynamic shape equations for electrowetting droplets. The spreading and retraction dynamics of electrowetting droplets were well explained, and it was confirmed that the transient dynamics of electrowetting can be characterized by a timescale independent of liquid viscosity, droplet size, and applied voltage.
Article
Optics
Pengpeng Zhao, Yang Li, Hans Zappe
Summary: This study proposes methods to enhance the response speed of electrowetting-based tunable fluidic lenses by optimizing fluid properties and modifying actuation voltages. Through simulations and careful design of actuation pulses, the response time can be significantly reduced, improving the performance of the systems.
Article
Chemistry, Multidisciplinary
Qi Wang, Shijie Zhang, Chen Wang, Rui Li, Tianhan Cai, Dawei Zhang
Summary: The proposed infrared optical switch based on a vanadium dioxide thin film can achieve wavelength-selective optical switching and has two-way switching capability, with simulation results showing excellent performance.
Article
Engineering, Electrical & Electronic
Ryosuke Matsumoto, Ryotaro Konoike, Hiroyuki Matsuura, Keijiro Suzuki, Takashi Inoue, Kazuhiro Ikeda, Shu Namiki, Ken-ichi Sato
Summary: This paper briefly reviews electrical switching technologies in current intra-data centers and discusses requirements for optical circuit switches in future data centers. It highlights an optical switch architecture that combines space and wavelength dimensions for large port counts and fast switching. The paper also presents an effective cooperative filtering scheme for C-band WDM coherent signals to alleviate receiver power limitation.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yu Wang, Huang Wu, Leighton O. Jones, Martin A. Mosquera, Charlotte L. Stern, George C. Schatz, J. Fraser Stoddart
Summary: Cocrystal engineering is a popular strategy for tuning the photophysical properties of crystalline materials. This research presents a color-tunable upconversion-emission switch based on the interconversion between two cocrystals, demonstrating the reversible transformation and color change mechanism between cocrystals.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Yu Wang, Huang Wu, Leighton O. Jones, Martin A. Mosquera, Charlotte L. Stern, George C. Schatz, J. Fraser Stoddart
Summary: Cocrystal engineering is a popular strategy for tuning the photophysical properties of crystalline materials. This study reports a color-tunable upconversion-emission switch based on the interconversion between two cocrystals. The research provides a critical example of precise control of cocrystal-to-cocrystal transformation and offers a reference for fabricating color tunable nonlinear optical materials in the solid state.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Hui Gong, Jingru Ai, Wanzhong Li, Jiahao Zhu, Qianqian Zhang, Jingbing Liu, Yuhong Jin, Hao Wang
Summary: A flexible self-driven IR-ECD was developed, enabling variable optical and thermal management in a low-energy mode with high coloration efficiency and maximum temperature modulation effect. Additionally, the device exhibited good reversibility and stability, showing potential applications in military camouflage and commercial thermal control.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Physics, Multidisciplinary
Zichuan Yi, Hu Zhang, Wenjun Zeng, Haoqiang Feng, Zhengxing Long, Liming Liu, Yunfeng Hu, Xichen Zhou, Chongfu Zhang
Summary: Electrowetting display (EWD) is a promising technology in new electronic paper technologies, combining the advantages of electrophoretic display (EPD) technology with color video playback capabilities. The driving waveform, as a key technology, plays a crucial role in determining the display effect of pixels.
FRONTIERS IN PHYSICS
(2021)
Article
Optics
Liang Dan, Zhao Rui, Liang Zhongcheng, Kong Meimei, Chen Tao
Summary: This study investigates the electrowetting properties of a non-conductive droplet driven by a planar electrode. The experimental results show that the droplet contracts inward and the contact angle and height increase with increasing voltage. The silicon oil and propylene glycol system acts as a positive lens.
OPTOELECTRONICS LETTERS
(2022)
Article
Optics
Chun Li, Ling Jiang, Qingxiao Ma, Yan Teng, Borui Bian, Mei Yu, Min Hua, Xiaoming Liu, Jingjing He, Runfeng Su, Chengtao Jiang
Summary: The study introduces an electrically tunable superconducting device capable of switching THz wave transmission with high efficiency and good narrow-bandpass characteristics.
Article
Automation & Control Systems
Qiu Xu, Raed Alahmdi, Lvjun Wang, Rodrigo T. Rocha, Mohammad I. Younis
Summary: In this article, a multithreshold microelectromechanical tunable inertial switch is introduced, aiming to provide quantitative information on acceleration while being energy-saving. The device is composed of serpentine springs, a suspended proof mass, and stationary electrodes, allowing for measurement of acceleration in different ranges. Experimental and simulation results validate the reliability and effectiveness of the device concept.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Chemistry, Multidisciplinary
Yi-Chang Yang, Xin Liu, Chu-Feng Zhu, Lin Zhu, Li-Ming Wu, Ling Chen
Summary: A material with nonlinear optical switch properties that can switch second-harmonic generation at a phase transition temperature has been reported, showing potential for applications in photoswitching and optical computing. The study achieved precise control of the phase transition temperature by forming a series of solid-solution crystals, which exhibited excellent nonlinear optical switching performance and a linear tunable temperature range.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Ta-Jen Yang, Zong-Hong Lin, Yen-Wen Lu
Summary: Digital microfluidic (DMF) is a popular microfluidic platform for sample-preparation, but its reliance on an external power source limits its portability. This study presents a self-powered DMF device using a triboelectric nanogenerator (TENG), which provides high voltage and low current output characteristics consistent with DMF's requirements. Basic droplet manipulations and chemical reactions were successfully demonstrated on the TENG-powered DMF device, showing its potential in point-of-care testing applications.
Article
Optics
Danyang Wang, Degang Hu, Yanwu Zhou, Licun Sun
Summary: In this study, a focus-tunable liquid cylindrical lens based on electrowetting was designed and fabricated. By changing the supplied voltage, the proposed liquid cylindrical lens can serve as both a converging and diverging lens with a fast response time. By combining it with a fixed cylindrical lens, a cylindrical lens system with an arbitrary focal length can be realized.
Article
Chemistry, Multidisciplinary
Hao Wu, Ranabir Dey, Igor Siretanu, Dirk van den Ende, Lingling Shui, Guofu Zhou, Frieder Mugele
Article
Physics, Multidisciplinary
Hao Wu, Niels Mendel, Dirk van den Ende, Guofu Zhou, Frieder Mugele
PHYSICAL REVIEW LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Niels Mendel, Hao Wu, Frieder Mugele
Summary: A novel electric nanogenerator has been developed that converts the energy of moving drops into electrical signals through charge trapping technology, using a unique combination of stacked materials and charging methods to maintain stability in high temperatures, with potential for applications in energy harvesting and other fields.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Harmen Hoek, Ranabir Dey, Frieder Mugele
Summary: The study shows that despite contact angle hysteresis and random drop coalescence events, the preferential drop positions closely follow numerically calculated local minima of electrostatic energy for variable drop size. This quantitative understanding provides important insights for improving heat transfer performance in various applications.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Chemistry, Physical
Sachin Nair, Jun Gao, Cees Otto, Michael H. G. Duits, Frieder Mugele
Summary: By using 3D Confocal Raman Microscopy, it was found that the surfactant layer is stable at high salinities, leading to preferential oil wetting. Upon reducing the ambient brine salinity, this layer decomposes and the surfaces become more water wet. The surfactant is found to partly dissolve in the oil and partly precipitate at the oil-water interface.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Mechanical
Qierui Zhang, Frieder Mugele, Dirk van den Ende, Piet M. Lugt
Summary: The study found that the Washburn-like model based on the affinity of the oil for the grease matrix is applicable for greases made of various thickeners and base oils. This model can potentially be used for modeling the bleeding of stationary grease and monitoring the change in bleeding properties of greases in a bearing.
TRIBOLOGY TRANSACTIONS
(2021)
Article
Chemistry, Analytical
Sachin Nair, Jun Gao, Cees Otto, Michael H. G. Duits, Frieder Mugele
Summary: This study demonstrates the ultrasensitive detection of R6G molecules adsorbed from aqueous solutions using algorithm-improved confocal Raman microscopy and chemical enhancement by two-dimensional substrates. By developing a protocol for laser-induced reduction of graphene oxide and noninvasive Raman imaging, subnanomolar limits of detection were achieved on various substrates, allowing for the study of adsorption kinetics and imaging of spatial distribution. The findings suggest a strong potential for algorithm-improved graphene-enhanced Raman spectroscopy as a convenient method for detecting, imaging, and quantifying trace amounts of adsorbing molecules on different 2D substrates.
ANALYTICAL CHEMISTRY
(2021)
Article
Energy & Fuels
Duy Le-Anh, Ashit Rao, Stefan Schlautmann, Amy Z. Stetten, Subhash C. Ayirala, Mohammed B. Alotaibi, Michel H. G. Duits, Han Gardeniers, A. A. Yousef, Frieder Mugele
Summary: This study investigates the impact of fluid aging and temperature on the design of a successful microfluidic improved oil recovery (IOR) strategy. Laboratory experiments were performed using a glass 2.5D micromodel to simulate waterflooding processes at the pore scale. The results demonstrate the significance of fluid aging and temperature in achieving effective oil recovery.
Article
Chemistry, Physical
Niels Mendel, Diana Siretanu, Igor Siretanu, Derk W. F. Brilman, Frieder Mugele
Summary: The study found that appropriately sized interlayer cations can open up the interlayer space, making carbon dioxide easily accessible and achieving efficient adsorption under suitable conditions, confirming the potential of natural layered expandable clay minerals for gas separation or carbon sequestration.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Aram Klaassen, Fei Liu, Frieder Mugele, Igor Siretanu
Summary: The balance between hydration and DLVO forces at solid-liquid interfaces controls many processes, with molecular scale hydration forces and surface charge density having largely independent origins. Oscillatory hydration forces were found to be largely independent of pH and salt concentration, and more pronounced on gibbsite surfaces due to the distribution of hydroxyl groups available for H bonding.
Article
Chemistry, Physical
Oezlem Kap, Simon Hartmann, Harmen Hoek, Sissi de Beer, Igor Siretanu, Uwe Thiele, Frieder Mugele
Summary: Polymer brush layers are responsive materials that swell in contact with solvents and their vapors. Experiments and calculations show that the dynamics of swelling in the brush layer are controlled by a combination of direct imbibition and vapor phase transport. A gradient dynamics model is developed to describe the observations and provide insights into the stabilization of non-equilibrium swelling profiles. The results emphasize the importance of vapor phase transport in wetting phenomena involving volatile liquids on functional surfaces.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Chemical
Niels Mendel, Igor Siretanu, Frieder Mugele, Derk W. F. Wim Brilman
Summary: The study evaluated the separation efficiency of three montmorillonite-rich bentonite clay sorbents in biogas upgrading. The cation-exchanged clays showed good selectivity and fast regeneration, making them a promising alternative to traditional sorbents.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Igor Siretanu, Simone R. van Lin, Frieder Mugele
Summary: Researchers conducted a systematic study on hydration forces on mica surfaces and amorphous silica surfaces in aqueous electrolytes containing chloride salts. They found oscillatory and monotonically decaying hydration forces of similar strength on both surfaces, with a characteristic range of approximately 1 nm. The presence and disruption of force oscillations provide opportunities to probe water polarization.
FARADAY DISCUSSIONS
(2023)
Article
Multidisciplinary Sciences
Jianqiang Zhang, Xuejiao Wang, Zhaoyue Wang, Shangfa Pan, Bo Yi, Liqing Ai, Jun Gao, Frieder Mugele, Xi Yao
Summary: The study presents a programmable magnetic actuation method to manipulate droplets of various kinds using ferrofluid wetting ridges, which is crucial for biomedical and industrial applications such as processing and analyzing biological samples and collectively actuating micrometer-sized droplets.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Qierui Zhang, Frieder Mugele, Piet M. Lugt, Dirk van den Ende
