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14. Tandem one‐pot synthesis of block copolymers for anion exchange membranes.

Author

Lai, Ao Nan, Wang, Zhen, Lin, Ren Ke, Han, Xin Zhi, and Zhou, Shu Feng

Subjects
ION-permeable membranes, ATOMIC force microscopes, SMALL-angle scattering, IONIC conductivity, FUEL cells
Abstract

The anion exchange membrane (AEM) suffered from poor mechanical properties and low ionic conductivity in fuel cells. Herein, a series of novel block fluorene‐contained poly(arylene ether ketone)s backbones are synthesized by a tandem one‐pot process and then grafted with alkyl chains to form comb‐shaped structure for preparing AEMs. The one‐pot synthesis of block copolymer avoids the multiple purifications of oligomers. The membranes' structure–property relationship is studied by changing the ratios of hydrophilic and hydrophobic segments. The designed comb‐shaped structures grafted on fluorene‐containing block backbones can widen the space between chains and form clear microphase separation patterns, as determined by atomic force microscope (AFM) and small angle x‐ray scattering (SAXS). Hence, resulting AEMs have a high ionic conductivity (117.4 mS cm−1, 80°C). Meanwhile, they also present low swelling rate (SR) from 12.76% to 18.51% at 30°C, 16.84% to 24.36% at 60°C, and 18.33% to 25.81% at 80°C. In addition, excellent mechanical properties, that is, an elongation at break of 29.63% and a tensile strength of 28.72 MPa, are achieved and showed the promise of as‐fabricated AEMs in fuel cell applications. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Differences in the carcinogenic evaluation of glyphosate between the International Agency for Research on Cancer (IARC) and the European Food Safety Authority (EFSA)

Author

Portier, Christopher J, Armstrong, Bruce K, Baguley, Bruce C, Baur, Xaver, Belyaev, Igor, Bellé, Robert, Belpoggi, Fiorella, Biggeri, Annibale, Bosland, Maarten C, Bruzzi, Paolo, Budnik, Lygia Therese, Bugge, Merete D, Burns, Kathleen, Calaf, Gloria M, Carpenter, David O, Carpenter, Hillary M, López-Carrillo, Lizbeth, Clapp, Richard, Cocco, Pierluigi, Consonni, Dario, Comba, Pietro, Craft, Elena, Dalvie, Mohamed Aqiel, Davis, Devra, Demers, Paul A, De Roos, Anneclaire J, DeWitt, Jamie, Forastiere, Francesco, Freedman, Jonathan H, Fritschi, Lin, Gaus, Caroline, Gohlke, Julia M, Goldberg, Marcel, Greiser, Eberhard, Hansen, Johnni, Hardell, Lennart, Hauptmann, Michael, Huang, Wei, Huff, James, James, Margaret O, Jameson, CW, Kortenkamp, Andreas, Kopp-Schneider, Annette, Kromhout, Hans, Larramendy, Marcelo L, Landrigan, Philip J, Lash, Lawrence H, Leszczynski, Dariusz, Lynch, Charles F, Magnani, Corrado, Mandrioli, Daniele, Martin, Francis L, Merler, Enzo, Michelozzi, Paola, Miligi, Lucia, Miller, Anthony B, Mirabelli, Dario, Mirer, Franklin E, Naidoo, Saloshni, Perry, Melissa J, Petronio, Maria Grazia, Pirastu, Roberta, Portier, Ralph J, Ramos, Kenneth S, Robertson, Larry W, Rodriguez, Theresa, Röösli, Martin, Ross, Matt K, Roy, Deodutta, Rusyn, Ivan, Saldiva, Paulo, Sass, Jennifer, Savolainen, Kai, Scheepers, Paul TJ, Sergi, Consolato, Silbergeld, Ellen K, Smith, Martyn T, Stewart, Bernard W, Sutton, Patrice, Tateo, Fabio, Terracini, Benedetto, Thielmann, Heinz W, Thomas, David B, Vainio, Harri, Vena, John E, Vineis, Paolo, Weiderpass, Elisabete, Weisenburger, Dennis D, Woodruff, Tracey J, Yorifuji, Takashi, Yu, Il Je, Zambon, Paola, Zeeb, Hajo, and Zhou, Shu-Feng

Subjects
Carcinogens, Consumer Product Safety, European Union, Food Safety, Glycine, Herbicides, Humans, International Agencies, Neoplasms, CANCER, ENVIRONMENTAL HEALTH, Environmental epidemiology, PUBLIC HEALTH POLICY, TOXICOLOGY
Published
2016

36. Design of Near Infrared Light‐Powered Copper Phyllosilicate Nanomotors for Cuproptosis‐Based Synergistic Cancer Therapy.

Author

Song, Yibo, Zhan, Guowu, and Zhou, Shu‐Feng

Subjects
PHOTOTHERMAL effect, NANOMOTORS, CANCER treatment, HYDROXYL group, COPPER, ANTINEOPLASTIC agents
Abstract

Cuproptosis, a newly discovered cell death pathway, has shown great potential in cancer treatment. Herein, near‐infrared (NIR) light‐driven nanomotors (CuSiO3@Au‐Pd NMs) are designed for cuproptosis‐assisted synergistic therapy with autonomous mobility and improved cellular uptake and tumor penetration. Specifically, the released Cu2+ ions from CuSiO3@Au‐Pd NMs can induce the Fenton‐like reaction, leading to the generation of hydroxyl radicals (·OH), accompanied by the depletion of glutathione within the MCF‐7 cells. Additionally, the designed CuSiO3@Au‐Pd NMs also exhibit excellent photothermal effects, which can further promote the production of ·OH, resulting in intensified oxidative stress and cellular apoptosis. Moreover, the enhanced tumor permeation efficiency and cellular uptake of CuSiO3@Au‐Pd NMs via autonomous movement under self‐thermophoretic forces are proved using 2D cellular experiments and 3D multicellular tumor spheroids. The resultant intracellular accumulation of Cu2+ can induce the oligomerization of lipoylated proteins, leading to cuproptosis, along with the mitochondrial dysfunction pathway. More importantly, both in vitro and in vivo experiments show that CuSiO3@Au‐Pd NMs could penetrate deeply into tumors and exhibit great anticancer efficacy through multimodal therapeutic methods. These findings manifest promising potentials of NIR‐powered Cu‐based NMs with high maneuverability for future smart and synergistic cancer therapy. [ABSTRACT FROM AUTHOR]

Published
2024
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37. Comb‐shaped block poly(arylene ether sulfone ketone)s for anion exchange membranes.

Author

Lai, Ao Nan, Li, Shu Chun, Zheng, Pei Zhi, Zhou, Shu Feng, and Wu, Shi Jie

Abstract

A well‐designed architecture is presented here to construct high‐performance anion exchange membranes (AEMs). A series of quaternized fluorene‐containing block poly(arylene ether sulfone ketone)s (QFPESK‐m‐n) is synthesized as the main chains, and grafted with comb‐shaped C8 long alkyl chains for the AEMs. By varying the hydrophilic segment' length, there has been a significant change in the microstructure as well as phase separation morphology of the membranes, as confirmed by atomic force microscopy. Hence the as‐prepared AEMs with moderate ion exchange capacities (IECs) show enhanced hydroxide conductivities in the range of 28.8―94.7 mS⋅cm−1 from 30 to 80°C. Furthermore, based on the block backbones and hydrophobic comb‐shaped alkyl chains, the AEMs show low‐level swelling ratios of 4.3% to 9.2% at 30°C and from 6.2% to 13.2% at 80°C, and superior ratios of conductivity to swelling. In addition, the QFPESK‐m‐n AEMs also depict acceptable mechanical properties, good thermal stability and an optimizable alkaline stability. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Modulation of afterglow electrochemiluminescence from nitrogen-deficient graphitic carbon nitride by pH.

Author

Chen, Lichan, Jia, Xuetao, Zhao, Weiye, Cheng, Sixuan, and Zhou, Shu-Feng

Subjects
NITRIDES, CARBON, ELECTROCHEMILUMINESCENCE, NANOSTRUCTURED materials
Abstract

Enhancing afterglow electrochemiluminescence (ECL) is significant to promote its further application. Here we find that the afterglow ECL of nitrogen-deficient graphitic carbon nitride (g-C3N4−x) nanosheets is modulable by environmental pH, and reaches the maximum at pH 9.0. The modulation mechanism is investigated by coupling the electrochemical and optical methods. [ABSTRACT FROM AUTHOR]

Published
2023
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49. CoZnO/C@BCN nanocomposites derived from bimetallic hybrid ZIFs for enhanced electromagnetic wave absorption.

Author

Lin, Xuexia, Hong, Jiafu, Wang, Chong-Chen, Su, Mengxing, and Zhou, Shu-Feng

Abstract

Rational design of dielectric–magnetic integrated nanomaterials for meeting impedance matching has been a significant challenge in the field of electromagnetic wave (EMW) absorption. Here, novel zeolitic imidazolate framework (ZIF) derivative-based carbon materials with a rational structure derived from ZIF-L(Zn)/ZIF-L(Co) are prepared to enhance the EMW absorption performance by simple mixing and pyrolysis. Tuning the molar ratio of ZIF-L(Zn) and ZIF-L(Co) can effectively alter the magnetic loss of the CoZnO/C@BCN composite. The metal particles embedded in the boron nitride nanotubes (BCNs) after ZIF-L(Zn) and ZIF-L(Co) pyrolysis reduce the dielectric coefficient, promote effective dispersion of metal particles, and regulate impedance matching. As a result, the CoZnO/C@BCN composite displays excellent EMW absorption with a minimum reflection loss (RL) of −54.9 dB at 6.5 GHz, as well as an effective absorption bandwidth (EAB) of 5.2 GHz (from 12.72 GHz to 17.92 GHz) with an equal absorber thickness of 1.9 mm. The CoZnO/C@BCNs achieve an excellent EMW absorption capacity, which is attributed to the multiple loss mechanisms and outstanding impedance matching. The results provide new insight into MOF-based carbon absorbers with light weight and high performance, which demonstrate significant potential in the treatment of EMW absorption. [ABSTRACT FROM AUTHOR]

Published
2023
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