Article
Chemistry, Physical
Bo Yan, Yinwu Li, Weiwei Cao, Zhiping Zeng, Pu Liu, Zhuofeng Ke, Guowei Yang
Summary: A highly efficient and selective CO2 reduction method is developed using laser reduction in liquid, achieving high CO yield and energy conversion efficiency.
Article
Chemistry, Multidisciplinary
Rui Yan, Kai Chen, Zhenjiang Li, Yuanyuan Qu, Luoyu Gao, Haoying Tong, Yongqiang Li, Jie Li, Yongzhu Hu, Kai Guo
Summary: Halogen bonding, similar to hydrogen bonding, was introduced into the catalytic cycloaddition of carbon dioxide into epoxide reactions. A series of halogen-bond donor catalysts containing N-iodopyridinium halide were synthesized and evaluated, with 4-(dimethylamino)-N-iodopyridinium bromide identified as the optimal catalyst. The mechanism of halogen-bonding catalysis was proposed and demonstrated through successful CCE reactions.
Article
Polymer Science
Kay Bischoff, Dominik Muecke, Gian-Luca Roth, Cemal Esen, Ralf Hellmann
Summary: In this study, we report on the laser ablation of cyclic olefin copolymer using an amplified ultrashort pulsed laser in the ultraviolet spectral range. The results demonstrate high ablation depth, excellent surface roughness, and increasing ablation efficiencies with increasing fluence. Comparing with an infrared laser wavelength, UV ablation shows significant advantages in terms of ablation efficiency, surface roughness, and quality. This study provides an efficient and qualitative tool for the laser machining of cyclic olefin copolymer using high-power UV ultrashort pulsed lasers.
Article
Materials Science, Composites
Davide Perin, Haroon Mahmood, Daniele Rigotti, Andrea Dorigato, Alessandro Pegoretti
Summary: This study investigates the self-healing behavior of carbon fiber reinforced composites by depositing COC meshes on dry carbon fiber plies. The introduction of COC mesh reduces flexural stress and interlaminar shear strength. The laminates containing 8 wt% COC show a healing efficiency of 9.4% and 33.7% for Mode I interlaminar fracture toughness.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Tomas Herink, Petr Fulin, Jiri Krupka, Josef Pasek
Summary: ORLEN Unipetrol's Steam Cracking unit is capable of processing various hydrocarbons and producing valuable hydrocarbons such as cyclopentadiene and dicyclopentadiene, in addition to ethylene, propylene, and benzene. ORLEN Unipetrol, in collaboration with the University of Chemistry and Technology in Prague, has developed a technology for extracting high purity dicyclopentadiene, which will add value to the raw C5 by-product stream. The capacity of the new dicyclopentadiene unit is expected to be 20-26 thousand metric tons per year.
Article
Chemistry, Physical
Kangqi Chang, Jiancheng Dong, Yanheng Mao, Yidong Peng, Lei Pu, Jian Meng, Minhao Guo, Piming Ma, Yunpeng Huang, Tianxi Liu
Summary: In this work, an ultra-stretchable dual-mode strain/tactile sensor is developed on a permeable olefin block copolymer (OBC) nonwoven substrate, which can monitor human motions and present the shape of various sounds. The sensor exhibits high sensitivity, wide detection range, and fast response/recovery times, making it capable of monitoring a wide range of human activities and differentiating natural sounds through air pressure sensing.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Analytical
Yu Sung Chuo, Sina Rezvani, Xavier Michaud, Simon S. Park
Summary: The discovery of piezoelectricity has led to the development of various sensing applications. Thin and flexible lead zirconate titanate (PZT) ceramic piezoelectric sensors offer advantages over bulk PZT and polymers in terms of minimal impacts on dynamics, high-frequency bandwidth, and constraints of tight spaces. Traditional thermal sintering methods consume time and energy, thus laser sintering of PZT and the incorporation of carbon nanotubes (CNTs) were explored to enhance the piezoelectric and mechanical properties. The optimized laser sintering approach resulted in a 10-fold increase in the piezoelectric coefficient of PZT and improved strength of the CNT/PZT film with reduced energy consumption. This research demonstrates the effective use of laser sintering for improved sensing applications.
Article
Polymer Science
Christopher Musgrave, Lorcan O'Toole, Tianyu Mao, Qing Li, Min Lai, Fengzhou Fang
Summary: This study provides experimental evidence of the reliability and reusability of cyclic olefin copolymer (COC) moulds in the manufacturing of soft contact lenses. These moulds maintained high performance surface roughness characteristics even after repeated use and exposure to high intensity ultraviolet (UV) light. Comparison with commercial lenses showed that the surface roughness of lenses made using COC moulds remained almost unchanged.
Article
Chemistry, Physical
Shohei Tada, Hiroka Kinoshita, Nagomu Ochiai, Anand Chokkalingam, Peidong Hu, Noriko Yamauchi, Yoshio Kobayashi, Kenta Iyoki
Summary: The development of methodologies for CO2 utilization is in high demand globally. Tandem catalysts of ZnZrOx and solid acid catalysts were proposed for one-pass synthesis of lower olefins. The pore sizes and channel dimensionality of zeolites influenced the selectivity of products, with zeolites with small pores showing potential for producing light olefins.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Alexey Rybaltovsky, Evgeniy Epifanov, Dmitriy Khmelenin, Andrey Shubny, Yuriy Zavorotny, Vladimir Yusupov, Nikita Minaev
Summary: Two methods are proposed for synthesizing bimetallic Au/Ag nanoparticles, utilizing different geometric configurations and laser sources. The first configuration demonstrates the possibility of obtaining Ag/Au alloy nanoparticles, while the second configuration shows the possibility of obtaining core-shell bimetallic Au/Ag nanoparticles.
Article
Chemistry, Applied
Shohei Tada, Duanxing Li, Mina Okazaki, Hiroka Kinoshita, Masahiko Nishijima, Noriko Yamauchi, Yoshio Kobayashi, Kenta Iyoki
Summary: Highly efficient CO2 utilization methodologies combining methanol synthesis catalysts and methanol conversion catalysts have been developed. The use of ZnO/ZrO2 as the catalyst for methanol synthesis and MOR zeolites as the catalyst for methanol conversion enables one-pass hydrocarbon production via CO2 hydrogenation. By physically mixing these catalysts, bifunctional catalysts are formed, which operate at low pressure and have shown promising results in terms of olefin selectivity.
Article
Polymer Science
Xiaoshan Pei, Yanxiao Li, Shicheng Zhao, Xuelian He
Summary: The new ethylene/cyclic olefin copolymers (COCs), although a major breakthrough in traditional polyolefins, have limited applications due to their high brittleness. This study explores the blending of COCs with ethylene/1-octene copolymer (POE) to compensate for the rigidity. The research demonstrates the formation, expansion, and coalescence of droplets at the melting state, resulting in phase changes from spherical droplets to cocontinuity with rising POE components. The synchronous reinforcement and toughness are achieved at a medium ratio of POEs.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Daniel C. Rabe, Uyen K. Ho, Adarsh Choudhury, Jessica C. Wallace, Evelyn G. Luciani, Dasol Lee, Elizabeth A. Flynn, Shannon L. Stott
Summary: This work demonstrates a method of depositing biotin onto the surface of a plastic microfluidic chip using aryl-diazonium, which chemically bonds biotin to the surface and allows for the addition of streptavidin nanoparticles. The nanoparticles increase the chip's surface area and improve the orientation of capture moieties. This method offers faster, cost-effective, and scalable production of devices, including those used for diagnostic testing.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Stefan Kefer, Kay Bischoff, Gian-Luca Roth, Julian Haubner, Bernhard Schmauss, Ralf Hellmann
Summary: This contribution presents electrically tunable polymer planar Bragg gratings based on bulk cyclic olefin copolymers. By simplifying the fabrication process, the device's tuning response can effectively be controlled via temperature changes induced by the copper conducting paths, resulting in a significant residual wavelength shift.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Physical
Samira Zafarnak, Ali Bakhtyari, Hamed Taghvaei, Mohammad Reza Rahimpour, Adolfo Iulianelli
Summary: This study evaluates the carbon-dioxide-assisted dehydrogenation over alumina-supported catalysts, with particular focus on the performance of cobalt and molybdenum oxide catalysts in ethylene production. Time on steam effect on catalyst performance was also investigated.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
