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Proton Transfer Anionic Polymerization of Methyl Methacrylate with Ligands for Dual Control of molecular Weight and Tacticity

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Precision Chemistry 2024年第12期2卷 628-633页

作者： Katsutoshi Sagawa Mineto Uchiyama Hironobu Watanabe Chihiro Homma Masami Kamigaito Department of Molecular and Macromolecular Chemistry Graduate School of EngineeringNagoya UniversityNagoya 464-8603Japan Department of Chemical Science and Engineering School of Materials and Chemical TechnologyInstitute of Science Tokyo2-12-1-S1-13 OokayamaMeguro-kuTokyo 152-8552Japan

Dual control of the molecular weight and tacticity in proton transfer anionic polymerization(PTAP)of methyl methacrylate(MMA)was investigated by using various ligands in the presence of a bulky potassium base catalyst and an organic compound with a weakly acidic C−H bond as dormant species in toluene at 0℃.The tacticity of the resulting poly(MMA)(PMMA)produced without ligands was nearly atactic(rr/mr/mm=22/54/24).However,the use of 18-crown-6 as a ligand afforded predominantly syndiotactic PMMA(rr≈58%),whereas the use of chiral bis(oxazoline)ligands gave slightly isotactic-rich PMMA(mm≈32%).molecular weight control of PMMA was achieved(Đ=1.1−1.2)by adding 1,1-diphenylethanol as a reversible terminator while maintaining control of the tacticity with the above *** PMMA consisting of atactic and syndiotactic segments was successfully synthesized via sequential PTAP using macroinitiator/macro-CTA methods.

关键词： living polymerization anionic polymerization stereospecific polymerization methacrylate stereoblock polymer

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High-speed and large-scale intrinsically stretchable integrated circuits

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Nature 2024年第8003期627卷 313-320页

作者： Zhong, Donglai Wu, Can Jiang, Yuanwen Yuan, Yujia Kim, Min-Gu Nishio, Yuya Shih, Chien-Chung Wang, Weichen Lai, Jian-Cheng Ji, Xiaozhou Gao, Theodore Z. Wang, Yi-Xuan Xu, Chengyi Zheng, Yu Yu, Zhiao Gong, Huaxin Matsuhisa, Naoji Zhao, Chuanzhen Lei, Yusheng Liu, Deyu Zhang, Song Ochiai, Yuto Liu, Shuhan Wei, Shiyuan Tok, Jeffrey B.-H. Bao, Zhenan Department of Chemical Engineering Stanford University Stanford CA United States Department of Electrical Engineering Stanford University Stanford CA United States Department of Medical Engineering Yonsei University College of Medicine Seoul South Korea Department of Chemical Engineering and Materials Engineering National Yunlin University of Science and Technology Yunlin Taiwan Department of Materials Science and Engineering Stanford University Stanford CA United States Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science Tianjin University Tianjin China Department of Chemistry Stanford University Stanford CA United States Institute of Industrial Science The University of Tokyo Tokyo Japan

Intrinsically stretchable electronics with skin-like mechanical properties have been identified as a promising platform for emerging applications ranging from continuous physiological monitoring to real-time analysis of health conditions, to closed-loop delivery of autonomous medical treatment^1–7. However, current technologies could only reach electrical performance at amorphous-silicon level (that is, charge-carrier mobility of about 1 cm² V⁻¹ s⁻¹), low integration scale (for example, 54 transistors per circuit) and limited functionalities^8–11. Here we report high-density, intrinsically stretchable transistors and integrated circuits with high driving ability, high operation speed and large-scale integration. They were enabled by a combination of innovations in materials, fabrication process design, device engineering and circuit design. Our intrinsically stretchable transistors exhibit an average field-effect mobility of more than 20 cm² V⁻¹ s⁻¹ under 100% strain, a device density of 100,000 transistors per cm², including interconnects and a high drive current of around 2 μA μm⁻¹ at a supply voltage of 5 V. Notably, these achieved parameters are on par with state-of-the-art flexible transistors based on metal-oxide, carbon nanotube and polycrystalline silicon materials on plastic substrates^12–14. Furthermore, we realize a large-scale integrated circuit with more than 1,000 transistors and a stage-switching frequency greater than 1 MHz, for the first time, to our knowledge, in intrinsically stretchable electronics. Moreover, we demonstrate a high-throughput braille recognition system that surpasses human skin sensing ability, enabled by an active-matrix tactile sensor array with a record-high density of 2,500 units per cm², and a light-emitting diode display with a high refreshing speed of 60 Hz and excellent mechanical robustness. The

关键词： Carbon nanotubes and fullerenes Electrical and electronic engineering Electronic devices Polymers

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Anti-Markovnikov ring-opening of sulfonium salts with alkynes by visible light/copper catalysis

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science China Chemistry 2023年第3期66卷 791-798页

作者： Xuan Li Min Jiang Junze Zuo Xiuyan Song Jian Lv Daoshan Yang Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science Ministry Of EducationCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Materials Chemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 310036China Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China

Internal alkynes are widespread skeletons in bioactive molecules and materials which are also used as important building blocks in chemical synthesis. Herein, we report a novel and efficient copper-catalyzed Sonogashira reaction between sulfonium salts and alkynes through an anti-Markovnikov ring-opening pathway promoted by visible light. The coexistence of the nitrogen and phosphorus ligands in the system is the key to the success of this reaction. This radical type ring-opening reaction affords a new strategy for the synthesis of internal alkynes. Furthermore, this study is also an effective complement to the diverse reaction patterns of sulfonium salts.

关键词： radical reaction visible-light photocatalysis sulfonium salts copper catalysis alkynes

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Ethanol steam reforming over Ni/ZSM-5 nanosheet for hydrogen production

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Chinese Journal of chemical engineering 2024年第3期67卷 247-256页

作者： Porapak Suriya Shanshan Xu Shengzhe Ding Sarayute Chansai Yilai Jiao Joseph Hurd Daniel Lee Yuxin Zhang Christopher Hardacre Prasert Reubroycharoen Xiaolei Fan Department of Chemical Engineering School of EngineeringThe University of ManchesterManchester M139PLUnited Kingdom Program of Petrochemistry and Polymer Science Faculty of ScienceChulalongkorn UniversityBangkok10330Thailand Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Liaoning Academy of Materials Shenyang 110167China Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals(CBRC) andDepartment of Chemical TechnologyFaculty of ScienceChulalongkorn UniversityBangkok 10330Thailand Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo ChinaNingbo315100China

Compared to reforming reactions using hydrocarbons,ethanol steam reforming(ESR)is a sustainable alternative for hydrogen(H_(2))production since ethanol can be produced sustainably using *** work explores the catalyst design strategies for preparing the Ni supported on ZSM-5 zeolite catalysts to promote ***,two-dimensional ZSM-5 nanosheet and conventional ZSM-5 crystal were used as the catalyst carriers and two synthesis strategies,i.e.,in situ encapsulation and wet impregnation method,were employed to prepare the *** on the comparative characterization of the catalysts and comparative catalytic assessments,it was found that the combination of the in situ encapsulation synthesis and the ZSM-5 nanosheet carrier was the effective strategy to develop catalysts for promoting H_(2) production via ESR due to the improved mass transfer(through the 2-D structure of ZSM-5 nanosheet)and formation of confined small Ni nanoparticles(resulted via the in situ encapsulation synthesis).In addition,the resulting ZSM-5 nanosheet supported Ni catalyst also showed high Ni dispersion and high accessibility to Ni sites by the reactants,being able to improve the activity and stability of catalysts and suppress metal sintering and coking during ESR at high reaction ***,the Ni supported on ZSM-5 nanosheet catalyst prepared by encapsulation showed the stable performance with~88% ethanol conversion and~65% H_(2) yield achieved during a 48-h longevity test at 550-C.

关键词： ZSM-5 nanosheet In situ encapsulation Ni catalyst Ethanol steam reforming Hydrogen production

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Trace Determination of Cardiac Troponin I Using a Label-Free Fiber Optical Localized Surface Plasmon Resonance Biosensors

Trace Determination of Cardiac Troponin I Using a Label-Free...

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2024 Laser Applications to chemical, Security and Environmental Analysis, LACSEA 2024 - Part of Optica Sensing Congress

作者： Chiang, Chang-Yue Chen, Chien-Hsing Wang, Chien-Tsung Wu, Chin-Wei Chiang, Hsing-Yu Graduate School of Engineering Science and Technology Interdisciplinary Program of Engineering National Yunlin University of Science and Technology Yunlin64002 Taiwan Department of Biomechatronics Engineering National Pingtung University of Science and Technology Pingtung91201 Taiwan Department of Chemical & Materials Engineering National Yunlin University of Science and Technology Yunlin64002 Taiwan

ISBN: (纸本)9781957171371

This work proposes a carboxyl-graphene-oxide-based fiber optic localized surface plasmon resonance biosensor which employed anti-Cardiac Troponin I (anti-cTnI) as the recognition element to detect the cTnI-protein in 10 min with a limit of detection (LOD) of 5.8 pM, which meets the acceptable LOD for clinical testing of 0.04 ng/mL. © Optica Publishing Group 2024, © 2024 The Author(s)

关键词： Surface plasmon resonance

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Construction and nanotribological study of a glassy covalent organic network on surface

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Nano Research 2022年第5期15卷 4682-4686页

作者： Guangyuan Feng Qingqing Luo Mengqi Li Yaru Song Yongtao Shen Shengbin Lei Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China

Unraveling the nature of complex condensed matter systems is of paramount importance in a variety of fields such as pharmacology and materials *** we report the synthesis,by the dynamic covalent chemistry(DCC),of a robust,continuous,and low-defect glassy covalent organic network(GCON).The direct imaging of the molecular structure clearly shows the amorphous nature of GCONs,which consists with the competing(nano)crystallite model,not Zachariasen continuous random networks(Z-CRN).Remarkably,the microscopic friction properties were measured on GCONs by atomic force microscopy(AFM),and the GCONs showed lower friction force in comparison with crystalline covalent organic frameworks(COFs).

关键词： atomic force microscopy glassy covalent organic networks(GcoN) nanotribological competing(nano)crystallite model scanningtunnelingmicroscopy

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Rare earth lanthanum pinning effect for corrosion resistance ultraefficient microwave absorption FeCo@rGO composites

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Journal of materials science & Technology 2024年第10期177卷 181-190页

作者： Junru Yao Jintang Zhou Lu Lu Feng Yang Zhengjun Yao Bo Ouyang Erjun Kan Yuxin Zuo Renchao Che Fan Wu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Ministry of Industry and Information Technology Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics)Nanjing 211100China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing School of ScienceNanjing University of Science and TechnologyNanjing 210094China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

Magnetic metal absorbers exhibit remarkable microwave absorption ***,their practical application is severely limited due to their susceptibility to corrosion,particularly in marine *** address this challenge,we propose a novel approach involving the modification and control of FeCo/rGO microwave absorbers using rare earth lanthanum(La).This strategy aims to achieve both high-performance microwave absorption and enhanced resistance to marine *** this study,we employ a La_(2)O_(3) modifying control strategy to refine the FeCo magnetic particles and coat them with CoFe_(2)O_(4) on the surface,leveraging the pinning effect of in situ generated La_(2)O_(3) .This process enhances the interface polarization of the absorbers,thereby improving their electromagnetic performance and ma-rine corrosion ***,the La_(2)O_(3) modified FeCo@rGO composites exhibit broadband ab-sorption,covering a wide frequency range of 6.11 GHz at 1.55 ***,the electromagnetic proper-ties of the La_(2)O_(3) modified FeCo@rGO absorbers remain stable even after prolonged exposure to a 3.5 wt% NaCI solution,simulating marine conditions,for at least 15 ***,we perform first-principle calculations on FeCo and FeCo-O to validate the corrosion resistance of the La_(2)O_(3) modified FeCo@rGO composites at the atomic *** comprehensive investigation explores the control of rare earth lan-thanum modification on the size of magnetic metal particles,enabling efficient electromagnetic wave absorption and marine corrosion *** results of this study provide a novel and facile strategy for the control of microwave absorbers,offering promising prospects for future research and development in this field.

关键词： Rare earth lanthanum FeCo@rGO Microwave absorption Marine corrosion resistance

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The fermented milk can be a natural ally against obesity? Investigation of bovine milk fermentation by Lacticaseibacillus casei LBC 237, screening, and In silico predictions of bioactive peptides for obesity control

Intelligent Pharmacy

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Intelligent Pharmacy 2024年第4期2卷 467-484页

作者： Bellaver, Emyr Hiago Militão da Costa, Ingrid Redin, Eduarda Eliza Moroni, Liziane Schittler Kempka, Aniela Pinto Santa Catarina State University Department of Animal Production and Food Science Multicentric Graduate Program in Biochemistry and Molecular Biology SC Lages Brazil Santa Catarina State University Department of Food Engineering and Chemical Engineering SC Pinhalzinho Brazil

The increasing quest for therapeutic alternatives in treating non-communicable chronic diseases like obesity has propelled research into bioactive peptides, with a particular focus on milk due to its rich protein composition and associated health benefits. Milk fermentation, a traditional process in dairy production, enhances the bioactivity of peptides, broadening their potential therapeutic uses. This study investigated the anti-obesity potential of peptides from bovine milk fermented by Lacticaseibacillus casei LBC 237, identifying 143 peptides, notably LGPV and EVPMP. In silico analyses revealed that LGPV and EVPMP biopeptides exhibited significant interactions with target proteins, employing various molecular interactions such as Van der Waals forces, hydrogen bonds, and electrostatic interactions. These peptides shared common binding sites in some enzymes, suggesting a similar mode of interaction between molecule and target protein, akin to key pharmaceuticals recommended for treating these pathologies. Furthermore, amino acid characteristics present in the peptides, including hydrophobic residues like Leucine, Glutamate, Valine, and Proline, proved essential for their bioactive and inhibitory activities. These findings highlight the potential of LGPV and EVPMP biopeptides as therapeutic agents in managing obesity and metabolic disorders. They provide important insights into their mechanisms of action, paving the way for future research to apply them practically in preventing and treating metabolic conditions. © 2024 The Authors

关键词： Biopeptides FAS HMG-CoAR molecular docking PL

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Effect of Mixing Strategy on the Structure-Properties of the PLA/PBAT Blends Incorporated with CNC

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Journal of Renewable materials 2022年第1期10卷 149-164页

作者： Deniz Sema Sarul Dogan Arslan Emre Vatansever Yusuf Kahraman Ali Durmus Reza Salehiyan Mohammadreza Nofar Polymer Science and Technology Program Institute of Science and TechnologyIstanbul Technical UniversityIstanbul34469Turkey Metallurgical&Materials Engineering Department Faculty of Chemical and Metallurgical EngineeringIstanbul Technical UniversityIstanbul34469Turkey Department of Chemical Engineering Faculty of EngineeringIstanbul University-CerrahpasaIstanbul34320Turkey Department of Materials Research and Technology Luxembourg Institute of Science and TechnologyEsch-sur-Alzette4362Luxembourg

Polylactide(PLA)/poly(butylene adipate-co-terephthalate)(PBAT)blend nanocomposites including 3 wt%of cel-lulose nanocrystals(CNCs)were prepared by melt compounding method in a twin-screw extruder and an inter-nal *** nanocomposites were formulated by diluting three different masterbatches prepared by solution casting method that contained 7 wt%of *** masterbatches were:(m1)PLA/PBAT/CNC masterbatch;(m2)PLA/CNC masterbatch;and(m3)PBAT/CNC *** were to explore how different prepara-tion methods affect the dispersion and localization of CNC and hence the properties of PLA/PBAT/CNC blend *** electron microscopy(SEM)was used to study the structural changes of the *** properties of PLA/PBAT blends and PLA/PBAT/CNC blend nanocomposites were also *** the samples prepared by internal mixer,the rheological behavior of blend nanocomposite prepared through premixing of CNC particles with PLA showed a transition from liquid-like to a gel-like *** to the rheological results and differential scanning calorimetry(DSC)analysis,it was found that the CNC overall enhanced the viscoelastic properties of blends and improved the PLA crystallization,*** mechanical analysis(DMA)illustrated that the incorporation of CNC also enhanced the elastic modulus of PLA/PBAT blends specifically above the glass transition temperature of *** expected improvements in mechanical properties did not occur due to the possible existence of residual solvent in the blends.

关键词： Polylactide poly(butylene adipate-co-terephthalate) cellulose nanocrystals blend nanocomposite morphology rheology

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Upcycling municipal solid waste to sustainable hydrogen via two-stage gasification-reforming

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Journal of Energy Chemistry 2024年第9期96卷 611-624页

作者： Hui Zhou Shuzhuang Sun Yikai Xu Yeshui Zhang Shouliang Yi Chunfei Wu Department of Energy and Power Engineering Tsinghua UniversityBeijing 100084China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001HenanChina Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China School of Engineering University of AberdeenAberdeen AB243UEUK U.S.Department of Energy National Energy Technology LaboratoryPittsburghPA 15236USA School of Chemistry and Chemical Engineering Queen’s University BelfastBelfast BT71NNUK

As global municipal solid waste(MSW)quantities continue to escalate,serious socio-environmental challenges arise,necessitating innovative ***-to-hydrogen(WTH)via two-stage gasification-reforming(TSGR)presents an emergent technology for MSW upcycling,offering to ease waste management burdens and bolster the burgeoning hydrogen *** early initiatives to advance TSGR technology,a cohesive and critical analysis of cutting-edge knowledge and strategies to enhance hydrogen production remains *** review aggregates literature on MSW upcycling to hydrogen via TSGR,with a focus on optimizing process control and catalytic *** underscores technological avenues to augment hydrogen output,curtail catalyst costs,and refine system ***,the review illuminates the potential for integrating chemical and calcium looping into TSGR processes,identifying opportunities,and pinpointing *** review concludes with a summary of the current state of techno-economic analysis for this technology,presenting outstanding challenges and future research directions,with the ultimate goal of transitioning WTH from theoretical to practical application.

关键词： Municipal solidwaste Upcycling Gasification Reforming Hydrogen

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