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Effect of PVP and reaction time to the morphology of synthesized nickel nanowires

AIP Conference Proceedings 2021年第1期2382卷

作者： Luigi A. Dahonog Everjoy S. Mones Evita Linda M. Mogol Mary Donnabelle L. Balela 1Department of Mining Metallurgical and Materials Engineering College of Engineering University of the Philippines Diliman Quezon City Philippines 1101 2Materials Science and Engineering Program College of Science University of the Philippines Diliman Quezon City Philippines 1101

Nanostructured metals have been utilized in numerous applications because of their advantage due to their enhanced properties. In this study, chain-like nickel (Ni) nanowires with diameters 100 to 500 nm and lengths up to 8.5 µm were synthesized using a simple chemical reduction method in the absence and presence of polyvinylpyrrolidone (PVP). X-ray diffraction (XRD) pattern confirmed the successful synthesis of Ni using the chemical reduction method. Scanning electron microscopy (SEM) revealed the formation of bead-like Ni nanowires upon the addition of PVP. On the other hand, smoother Ni nanowires were formed in the absence of PVP. Also, increasing the reaction time resulted in longer nanowires. Addition of PVP and increasing the reaction time affected the morphology of Ni nanowires.

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Corrigendum to "Impact of structural features of Sr/Fe co-doped HAp on the osteoblast proliferation and osteogenic differentiation for its application as a bone substitute" [Mater. Sci. Eng. C 110 (2020) 110633]

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Biomaterials advances 2023年 153卷 213560页

作者： Ismat Ullah Wancheng Zhang Liang Yang Muhammad Wajid Ullah Omar Mohammad Atta Suliman Khan Bin Wu Tianjun Wu Xianglin Zhang State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 PR China Ezhou Industrial Technology Research Institute Huazhong University of Science and Technology Wuhan PR China. State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 PR China. Department of Orthopedics Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 PR China. Department of Biomedical Engineering Huazhong University of Science and Technology Wuhan 430074 PR China. Ezhou Industrial Technology Research Institute Huazhong University of Science and Technology Wuhan PR China University of Chinese Academy of Sciences Beijing PR China. Ezhou Industrial Technology Research Institute Huazhong University of Science and Technology Wuhan PR China. Electronic address: hust_zxl@***.

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No-releasing nanomotor-loaded microneedles induce melanoma cell death via intracellular self-assembly

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International Journal of Pharmaceutics 2025年 681卷 125820页

作者： Ding, Chensheng Liu, Nian Chen, Zhengwei Wu, Zhuolin Mao, Chun Wu, Ziyu Xie, Yuan Wan, Mimi National and Local Joint Engineering Research Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing 210023 China Department of Vascular Surgery Cardiovascular Medical Center Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical School Nanjing 210008 China Key Laboratory of Drug Metabolism and Pharmacokinetics State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China

Due to the particularity of melanoma location, traditional drug delivery methods face difficulties in penetrating skin tissue and specifically clearing melanoma cells. Here, we designed a hyaluronic acid microneedle drug delivery system loaded with nanomotors which can effectively penetrate the skin tissue and deliver the therapeutic components to melanoma and specifically remove melanoma cells. The loaded nanomotors were prepared by radical polymerization of methacryloyl modified L-arginine (MA) and L-tyrosine (MTyr), named as MA/MTyr nanomotor. The microneedle drug delivery system can use the rigid structure of microneedles to break through the skin barrier and deliver nanomotors to deep tissues. The MA endowed them with the ability to sensitively sense the highly expressed inducible nitric oxide synthase in the tumor microenvironment, so as to realize the effective targeting of melanoma in skin tissue and uptake by tumor cells. Subsequently, the MTyr can produce quinone-enriched intermediates that can induce cell death under the catalysis of tyrosinase that was specifically highly expressed in melanoma cells, and self-assembled to form micron scale fibers through intermolecular hydrogen bonding interactions, thereby inducing melanoma cells to swell. This process synergistically promoted melanoma cell death without occurring in normal cells. The experimental results of cell and animal models confirmed the good therapeutic effect of the nanomotor loaded microneedles, which provided a new therapeutic concept and strategy for the development of therapeutic methods specifically for melanoma. © 2025 Elsevier B.V.

关键词： Intracellular self-assembly induces death Melanoma Microneedles Nanomotors

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[email protected] as high-performance and durable electrocatalyst for oxygen reduction reaction in alkaline membrane fuel cells

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Journal of Alloys and Compounds 2023年 938卷

作者： Shaik Gouse Peera Chao Liu Arunchander Asokan Matthew E. Suss Department of Environmental Science Keimyung University 1095 Dalseo-gu Daegu 42601 Republic of Korea Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and Technology Ganzhou 341000 China Faculty of Mechanical Engineering Technion – Israel Institute of Technology Haifa 320003 Israel Grand Technion Energy Program Technion – Israel Institute of Technology Haifa 3200003 Israel Wolfson Department of Chemical Engineering Technion – Israel Institute of Technology Haifa 3200003 Israel

Discovery of electrocatalysts composed of cheap transition metals are urgent to replace the traditional Pt/C catalyst used for oxygen reduction reaction (ORR). Herein, we synthesized Cu nanoparticles encapsulated with nitrogen-doped carbon ( [email protected] ) as an excellent and durable catalyst for ORR. A systematic evaluation of the effect of Cu content, acid leaching and secondary heat treatment have been established with the help of half-cell studies. The morphological analysis revealed that Cu nanoparticles surrounded by thick nitrogen doped carbon layers and further, the acid leaching and subsequent pyrolysis, boosted the electrocatalytic performance. The optimized [email protected] catalyst showed onset potential (potential corresponding to a current density of 0.10 mA cm −2 ) and half-wave potential of 0.97 V vs. RHE and 0.85 V vs. RHE, surpassing the state-of-the-art Pt/C catalyst. In addition, the [email protected] catalyst exhibited outstanding durability, tolerance to carbon monoxide and methanol molecules. In the alkaline fuel cell, [email protected] catalyst delivered 118 mW cm −2 peak power density in alkaline fuel cell operated with H 2 -O 2 , whereas Pt/C only delivered a peak power density of 97 mW cm −2 under ambient operating conditions. High ORR activity and better stability of [email protected] catalyst could be a potential alternative to Pt/C catalyst in alkaline fuel cells and metal-air cell cathodes.

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A new capnellene skeleton from the octocoral Capnella imbricata (Quoy & Gaimard, 1833)

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Journal of Molecular Structure 2023年 1271卷

作者： Wu, I-Ting Fan, Yu-Chen Lin, Guan-Zhou Wang, Yi-Lin Hwang, Tsong-Long Lai, Kuei-Hung Chung, Hsu-Ming Department of Applied Chemistry National Pingtung University Pingtung900391 Taiwan Graduate Institute of Biomedical Sciences Graduate Institute of Natural Products College of Medicine Chang Gung University Taoyuan33305 Taiwan Research Center for Chinese Herbal Medicine Graduate Institute of Healthy Industry Technology College of Human Ecology Chang Gung University of Science and Technology Taoyuan33305 Taiwan Department of Chemical Engineering Ming Chi University of Technology New Taipei City243303 Taiwan Department of Anesthesiology Chang Gung Memorial Hospital Taoyuan333 Taiwan PhD Program in Clinical Drug Development of Herbal Medicine College of Pharmacy Taipei Medical University Taipei11031 Taiwan Graduate Institute of Pharmacognosy College of Pharmacy Taipei Medical University Taipei11031 Taiwan Traditional Herbal Medicine Research Center Taipei Medical University Hospital Taipei11031 Taiwan

Chemical investigations on the ethyl acetate extract of the octocoral Capnella imbricata collected from the waters of Taiwan, which led to the isolation of three capnellenes (1–3), including one new metabolite, 9(12)-capnellene-8β,10α,15-triol (1), along with two known metabolites, 9(12)-capnellene-5α,8β,10α-triol (2), and 9(12)-capnellene-8β,10α-diol (3). The structures of the isolated metabolites were elucidated through extensive spectroscopic analyses, while the relative stereochemistry of 3 was confirmed by a single-crystal X-ray diffraction analysis for the first time in this study. Compounds 1–3 were evaluated in terms of their anti-inflammatory activity by examining their inhibitory effects on the generation of superoxide anions and the release of elastase by human neutrophils. © 2022 Elsevier B.V.

关键词： Metabolites

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Development of Flame Retardant Property on Sodium Silicate Treated Paper Based materials

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Journal of Physics: Conference Series 2022年第1期2175卷

作者： Thitiporn Suttipintu Siraprapa Lhosupasirirat Tanakorn Osotchan Toemsak Srikhirin Materials Science and Engineering Program School of Materials Science and Innovation Faculty of Science Mahidol University Bangkok10400 Thailand Research Network of NANOTEC at Mahidol University National Nanotechnology Center Thailand Department of Physics Faculty of Science Mahidol University 272 Rama VI Road Ratchathewi District Bangkok 10400 Thailand

The preparation of cellulose-based flame retardant paper treated with sodium silicate and silicon dioxide (SiO2) colloidal particle by simple immersion process is reported. Cellulose-based paper was preheated at 90°C for surface preparation. The heat treated paper was immersed in solution of sodium silicate-SiO2 at different immersion time ranging from 15 min to 24 hrs. Treated solution diffused into paper coated on the paper fiber and filled the void in the paper microstructure. Treated paper was heated at 90°C to convert an impregnated sodium silicate-SiO2 precursor into silicate framework. The treated paper showed Vsym Si-O-Si from siloxane bond at 792 cm-1 which confirmed a presence of SiO2 in paper. Treated paper at 1 hr immersion showed the highest weight percent gain (WPG) of 40% and total combustion time was improved to 14 sec.

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Nonreciprocal transport in a bilayer of MnBi2Te4 and Pt

arXiv

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arXiv 2022年

作者： Ye, Chen Xie, Xiangnan Lv, Wenxing Huang, Ke Yang, Allen Jian Jiang, Sicong Liu, Xue Zhu, Dapeng Qiu, Xuepeng Tong, Mingyu Zhou, Tong Hsu, Chuang-Han Chang, Guoqing Lin, Hsin Li, Peisen Yang, Kesong Wang, Zhenyu Jiang, Tian Wang, Xiao Renshaw Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Changsha410073 China Physics Laboratory Industrial Training Center Shenzhen Polytechnic Guangdong Shenzhen518055 China Department of NanoEngineering Program of Chemical Engineering University of California La Jolla San DiegoCA92093-0448 United States Program of Materials Science and Engineering University of California La Jolla San DiegoCA92093-0418 United States Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Fert Beijing Institute MIIT Key Laboratory of Spintronics School of Integrated Circuit Science and Engineering Beihang University Beijing100191 China Beihang-Goertek Joint Microelectronics Institute Qingdao Research Institute Beihang University Qingdao266000 China Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University Shanghai200092 China College of Advanced Interdisciplinary Studies National University of Defense Technology Changsha410073 China Insitute of Physics Academia Sinica Taipei115229 Taiwan College of Intelligence Science and Technology National University of Defense Technology Changsha410073 China National Innovation Institute of Defense Technology Academy of Military Sciences PLA China Beijing100010 China Beijing Academy of Quantum Information Sciences Beijing100084 China Beijing Institute for Advanced Study National University of Defense Technology Changsha410073 China School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Ave 639798 Singapore

MnBi2Te4 (MBT) is the first intrinsic magnetic topological insulator with the interaction of spin-momentum locked surface electrons and intrinsic magnetism, and it exhibits novel magnetic and topological phenomena. Recent studies suggested that the interaction of electrons and magnetism can be affected by the Mn-doped Bi2Te3 phase at the surface due to inevitable structural defects. Here we report an observation of nonreciprocal transport, i.e. current-direction-dependent resistance, in a bilayer composed of antiferromagnetic MBT and nonmagnetic Pt. The emergence of the nonreciprocal response below the Néel temperature confirms a correlation between nonreciprocity and intrinsic magnetism in the surface state of MBT. The angular dependence of the nonreciprocal transport indicates that nonreciprocal response originates from the asymmetry scattering of electrons at the surface of MBT mediated by magnon. Our work provides an insight into nonreciprocity arising from the correlation between magnetism and Dirac surface electrons in intrinsic magnetic topological insulators. © 2022, CC BY.

关键词： Magnetism

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Advancements in 3D skin bioprinting: processes, bioinks, applications and sensor integration

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International Journal of Extreme Manufacturing 2024年第1期7卷 012009-012009页

作者： I Deniz Derman Taino Rivera Laura Garriga Cerda Yogendra Pratap Singh Shweta Saini Hasan Erbil Abaci Ibrahim T Ozbolat Engineering Science and Mechanics Department Penn State University University Park PA United States of America The Huck Institutes of the Life Sciences Penn State University University Park PA United States of America Biomedical Engineering Department Penn State University University Park PA United States of America Department of Dermatology Columbia University Irving Medical Center New York NY United States of America Department of Biomedical Engineering Columbia University New York NY United States of America Materials Research Institute Penn State University University Park PA United States of America Cancer Institute Penn State University University Park PA United States of America Neurosurgery Department Penn State University University Park PA United States of America Department of Medical Oncology Cukurova University Adana Turkey

This comprehensive review explores the multifaceted landscape of skin bioprinting, revolutionizing dermatological research. The applications of skin bioprinting utilizing techniques like extrusion-, droplet-, laser- and light-based methods, with specialized bioinks for skin biofabrication have been critically reviewed along with the intricate aspects of bioprinting hair follicles, sweat glands, and achieving skin pigmentation. Challenges remain with the need for vascularization, safety concerns, and the integration of automated processes for effective clinical translation. The review further investigates the incorporation of biosensor technologies, emphasizing their role in monitoring and enhancing the wound healing process. While highlighting the remarkable progress in the field, critical limitations and concerns are critically examined to provide a balanced perspective. This synthesis aims to guide scientists, engineers, and healthcare providers, fostering a deeper understanding of the current state, challenges, and future directions in skin bioprinting for transformative applications in tissue engineering and regenerative medicine.

关键词： 3D bioprinting skin models skin tissue engineering biofabrication biosensors

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Time-Varying ℓ₀ Optimization for Spike Inference from Multi-Trial Calcium Recordings

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Data science in science 2024年第1期3卷

作者： Shen, Tong Du, Mingyu Johnston, Kevin Grieco, Steven F. Crary, Rachel Guzowski, John F. Lur, Gyorgy Xu, Xiangmin Ombao, Hernando Guindani, Michele Yu, Zhaoxia Department of Statistics University of California Irvine 92697 CA United States Center for Complex Biological Systems University of California Irvine 92697 CA United States Department of Mathematics and The NSF-Simons Center for Multiscale Cell Fate Research University of California Irvine 92697 CA United States Department of Anatomy and Neurobiology School of Medicine University of California Irvine 92697 CA United States Department of Neurobiology and Behavior University of California Irvine 92697 CA United States The Center for the Neurobiology of Learning and Memory University of California Irvine 92697 CA United States Department of Biomedical Engineering University of California Irvine 92697 CA United States Department of Computer Science University of California Irvine 92697 CA United States The Center for Neural Circuit Mapping University of California Irvine 92697 CA United States Statistics Program KAUST Thuwal Saudi Arabia Department of Biostatistics University of California Los Angeles CA United States

Optical imaging of genetically encoded calcium indicators is a powerful tool to record the activity of a large number of neurons simultaneously over a long period of time from freely behaving animals. However, determining the exact time at which a neuron spikes and estimating the underlying firing rate from calcium fluorescence data remains challenging, especially for calcium imaging data obtained from a longitudinal study. We propose a multi-trial time-varying ℓ₀ penalized method to jointly detect spikes and estimate firing rates by robustly integrating evolving neural dynamics across trials. Our simulation study shows that the proposed method performs well in both spike detection and firing rate estimation. We demonstrate the usefulness of our method on calcium fluorescence trace data from two studies, with the first study showing differential firing rate functions between two behaviors and the second study showing evolving firing rate functions across trials due to learning. © 2024 The Author(s). Published with license by Taylor & Francis Group, LLC.

关键词： calcium imaging firing rate spike detection Time-varying penalty ℓ0 regularization

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Self-Immolative Polymers Derived from Renewable Resources via Thiol–Ene Chemistry**

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Angewandte Chemie 2024年第5期137卷

作者： Dr. Zhengyu Deng Prof. Dr. Elizabeth R. Gillies Department of Chemistry The University of Western Ontario 1151 Richmond St. London Ontario N6 A 5B7 Canada Present address: School of Chemistry and Materials Science School of Biomedical Engineering Division of Life Sciences and Medicine University of Science and Technology of China Hefei 230026 Anhui Province China Suzhou Institute for Advanced Research University of Science and Technology of China Suzhou 215123 Jiangsu Province China Department of Chemical and Biochemical Engineering The University of Western Ontario 1151 Richmond St. London Ontario N6 A 5B9 Canada

The development of polymers from renewable resources is a promising approach to reduce reliance on petrochemicals. In addition, depolymerization is attracting significant attention for the breakdown of polymers at their end-of-life or to achieve specific stimuli-responsive functions. However, the design of polymers incorporating both of these features remains a challenge. Herein, we report a new class of self-immolative polymers based on lignin-derived aldehydes via a simple thiol-ene polymerization. These self-immolative polymers undergo cascade degradation in response to specific stimuli through alternating 1,6-elimination and cyclization reactions. The two methoxy substituents on the syringaldehyde monomer accelerated the desired depolymerization reaction, while enhancing stability against undesired backbone hydrolysis. Moreover, diverse responsive end-caps could be introduced through post-polymerization functionalization from a single polymer precursor.

关键词： self-immolative depolymerization thiol-ene click chemistry biobased

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