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A Surface-Strained and Geometry-Tailored Nanoreactor that Promotes Ammonia Electrosynthesis

Advanced materials 2020年第50期132卷 22799-22805页

作者： Li, Panpan Jin, Zhaoyu Fang, Zhiwei Yu, Guihua Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States Center for Electrochemistry Department of Chemistry The University of Texas at Austin AustinTX78712 United States

A surface-strained and geometry-optimized TiO2 nanoreactor enhances the performance of electrocatalytic nitrogen fixation. The nanotubular confinement allows spatial regulation of the mass transport of nitrogen during the NRR process and offers an enlarged surface area, thus boosting the ammonia production with high selectivity. Both experimental and theoretical evidence support strained Ti3+ sites, demon- strating a more favorable pathway for the N2 activation and selective NH3 production with a faster kinetic rate than the pristine TiO2. The TiO2-based nanoreactor with surface and bulk structure tailoring delivered an NH3 yield rate up to 5.50 μgh-1cm-2 (16.67 μgh-1 mgcat-1) and high faradaic effi- ciency of 26 % under ambient aqueous conditions Our findings highlight the concept of lattice strain and geometry modified nanoreactors, which will have broad implications in the renewable energy catalysis and electrosynthesis of valuable products. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Nitrogen fixation

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Polarization-driven dynamic laser speckle analysis for brain neoplasms differentiation

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Light(Advanced Manufacturing) 2024年第4期5卷 31-44页

作者： Vahid Abbasian Vahideh Farzam Rad Parisa Shamshiripour Davoud Ahmadvand Arash Darafsheh Department of Radiation Oncology Washington University School of Medicine in St.LouisSt.LouisMO 63110USA Imaging Science Program McKelvey School of EngineeringWashington University in St.LouisSt.LouisMO 63130USA Department of Physics Institute for Advanced Studies in Basic Sciences(IASBS)Zanjan 45137-66731Iran Department of Molecular Imaging Faculty of Advanced Technologies in MedicineIran University of Medical SciencesTehranIran Faculty of Medicine Iran University of Medical SciencesTehranIran

Early diagnosis of brain tumors is often hindered by non-specific symptoms,particularly in eloquent brain regions where open surgery for tissue sampling is *** limitation increases the risk of misdiagnosis due to tumor heterogeneity in stereotactic ***-free diagnostic methods,including intraoperative probes and cellular origin analysis techniques,hold promise for improving diagnostic *** offers valuable information on the polarization properties of biomedical samples,yet it may not fully reveal specific structural *** interpretative scope of polarimetric data is sometimes constrained by the limitations of existing decomposition *** the other hand,dynamic laser speckle analysis(DLSA),a burgeoning technique,not only does not account for the polarimetric attributes but also is known for tracking only the temporal activity of the dynamic *** study bridges these gaps by synergizing conventional polarimetric imaging with DLSA for an indepth examination of sample polarization *** effectiveness of our system is shown by analyzing the collection of polarimetric images of various tissue samples,utilizing a variety of adapted numerical and graphical statistical post-processing methods.

关键词： Polarimetric imaging Dynamic laser speckle analysis Cancerous tissue Brain neoplasm Label-free diagnostics

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An ultrahigh fatigue resistant liquid crystal elastomer-based material enabled by liquid metal

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science China materials 2022年第6期65卷 1679-1686页

作者： Hai-Feng Lu Zhen-Zhou Nie Hari Krishna Bisoyi Meng Wang Shuai Huang Xu-Man Chen Zhi-Yang Liu Hong Yang Institute of Advanced Materials School of Chemistry and Chemical EngineeringState Key Laboratory of BioelectronicsSoutheast UniversityNanjing 211189China Institute for Science and Applications of Molecular Ferroelectrics Key Laboratory of the Ministry of Education for Advanced Catalysis MaterialsZhejiang Normal UniversityJinhua 321004China Advanced Materials and Liquid Crystal Institute and Chemical Physics Interdisciplinary Program Kent State UniversityKentOH 44242USA

The low crosslink density characteristic of liquid crystal elastomer(LCE)materials causes poor fatigue resistance performance,which has seriously plagued their prospects in industrial *** we report that the introduction of 5 wt%liquid metal nanodroplets(average diameter:ca.195 nm)into the LCE network can dramatically reinforce the corresponding composite’s mechanical properties,in particular ultrahigh fatigue resistance,capable of bearing unprecedented 10,000 tensile cycles within a large range of strain amplitude up to 70%and 2000 times of continuous actuating ***,this liquid metal-incorporated LCE composite material exhibits large actuation stroke(maximum actuation strain:55%),high actuation stress(blocking stress:1.13 MPa),fully reversible thermal/photo-actuation functions,and self-healing ability at moderate temperatures,which qualifies the composite material for high-load actuators.

关键词： liquid crystal elastomer liquid metal fatigue resistance actuation

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Nanoscale Viscoelasticity Characterization of Engineered Organometallic Regenerative Tissue Scaffold Nanocomposites for Biomedical Applications

SSRN

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SSRN 2022年

作者： Yuya, Philip A. Patel, Nimitt G. Department of Mechanical and Aerospace Engineering Clarkson University PotsdamNY13699 United States Materials Science and Engineering Ph.D. Program Clarkson University PotsdamNY13699 United States

This work is focused on nanoscale viscoelastic properties characterization of gold nanoparticles (AuNPs) reinforced chitosan nanocomposites using nanoindentation. Chitosan nanocomposite films reinforced with gold nanoparticles concentration (w/v) up to 0.25 mg/ml in chitosan were prepared via a solution evaporation technique. Creep and stress relaxation responses were modeled using the generalized Voigt model and the generalized Maxwell model, respectively. Nanoindentation experimental data were analyzed using these models to obtain model constants. Both displacement- and load-controlled ramp functions were used to indent the samples with a 100 µm conospherical indenter tip. The moduli increased with an increase in AuNPs concentration in chitosan. The plasticity index increased with an increase in AuNPs concentration indicating that the deformation became more plastic with an increase in the filler. The results also show the time-dependent viscous response of the nanocomposite is mainly governed by the response of the matrix because the characteristic time scales of the nanocomposite films are independent of the AuNPs concentration. © 2022, The Authors. All rights reserved.

关键词： Creep

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In-situ synthesis and characterization of lightweight steel matrix composites reinforced by TiB2

Journal of Alloys and Metallurgical Systems

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Journal of Alloys and Metallurgical Systems 2024年 7卷

作者： Vidilli, André L. Otani, Lucas B. Koga, Guilherme Y. Amigó, Vicente Bolfarini, Claudemiro Federal University of São Carlos Graduate Program in Materials Science and Engineering Rodovia Washington Luís km 235 SP São Carlos13565-905 Brazil Valencia Spain Rodovia Washington Luís km 235 SP São Carlos13565-905 Brazil

This study aimed to synthesize lightweight steels in situ reinforced with 5 % and 10 vol% of TiB2 and evaluate the microstructural, physical, and mechanical properties. The Fe-(15;20 wt%)Mn-3 wt%Al-0.1 wt%C with 5 and 10 vol% of TiB2 were produced by spray forming followed by hot rolling and annealing. The concept of varying the manganese content was to assess the influence of the matrix constitution on the composite properties. The findings pointed to a direct correlation between the manganese content and the size and morphology of the TiB2 particles. The presence of the ceramic particles re-established the modulus of elasticity above 200 GPa only for composites with a predominantly ferritic matrix. The composites with a matrix composed mostly of austenite showed no gains in ductility during the tensile tests despite the activation of the TWIP effect. However, their wear behavior stands out positively. © 2024 The Authors

关键词： Tensile testing

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An Efficient Three-Factor Authenticated Key Agreement Technique Using FCM Under HC-IoT Architectures

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Computers, materials & Continua 2022年第7期72卷 1373-1389页

作者： Chandrashekhar Meshram Agbotiname Lucky Imoize Sajjad Shaukat Jamal Parkash Tambare Adel R.Alharbi Iqtadar Hussain Department of Post Graduate Studies and Research in Mathematics Jayawanti Haksar Government Post-Graduation CollegeCollege of Chhindwara UniversityBetul460001M.P.India Department of Electrical and Electronics Engineering Faculty of EngineeringUniversity of LagosAkokaLagos100213Nigeria Department of Electrical Engineering and Information Technology Institute of Digital CommunicationRuhr University44801BochumGermany Department of Mathematics College of ScienceKing Khalid UniversityAbhaSaudi Arabia Water Resources&Applied Mathematics Research Lab Nagpur440027India College of Computing and Information Technology University of TabukTabuk71491Saudi Arabia Mathematics Program Department of MathematicsStatistics and PhysicsCollege of Arts and SciencesQatar University2713DohaQatar

The Human-Centered Internet of Things(HC-IoT)is fast becoming a hotbed of security and privacy *** users can establish a common session key through a trusted server over an open communication channel using a three-party authenticated key *** of the early authenticated key agreement systems relied on pairing,hashing,or modular exponentiation processes that are computationally intensive and *** order to address this problem,this paper offers a new three-party authenticated key agreement technique based on fractional chaotic *** new scheme uses fractional chaotic maps and supports the dynamic sensing of HC-IoT devices in the network architecture without a password *** projected security scheme utilized a hash function,which works well for the resource-limited HC-IoT *** results show that our new technique is resistant to password guessing attacks since it does not use a ***,our approach provides users with comprehensive privacy protection,ensuring that a user forgery attack causes no ***,our new technique offers better security features than the techniques currently available in the literature.

关键词： Three-party authenticated key agreement anonymity fractional chaotic maps Chebyshev polynomial password table human-centered internet of things(HC-IoT)

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Alert and Response of Earthquake and Tsunami for Community Based Disaster Risk Reduction 2

Alert and Response of Earthquake and Tsunami for Community B...

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2nd International Conference on sciences and Technology Applications, ICOSTA 2020

作者： Retno Susilorini, Rr M. I. Pamudji, Andre Kurniawan Sanjaya, Ridwan Ismail, Amrizarois Amasto, Ardhito Hayyu Department of Infrastructure and Environmental Engineering Faculty of Environmental Science and Technology Soegijapranata Catholic University Semarang Indonesia Master Program of Environmental and Urban Studies Faculty of Environmental Science and Technology Soegijapranata Catholic University Semarang Indonesia Department of Information System Faculty of Computer Science Soegijapranata Catholic University Semarang Indonesia

Indonesia had been suffered by earthquake and tsunami for many centuries. Since many lives have taken by tsunami strikes, alert and response system are very important as important part of Disaster Risk Reduction, especially in area with high population density. This research conducted in Kangkung fishing village in Bandar Lampung coastal area which is an earthquake and tsunami prone area. The aim of the research is to study alert and response of Community Based Disaster Risk Reduction. The research conducted by qualitative method and purposive-descriptive approach. There were 53 respondents which participated in the survey and interview. It is reported that "Smart Resilient City"model suitable for community needs of alert and response of earthquake and tsunami disaster. This research meets conclusion that "Smart Resilient City"model may become a great solution in Community Based Disaster Risk Reduction to cope with the hazard of earthquake and tsunami comprehensively and sustainably. © Published under licence by IOP Publishing Ltd.

关键词： Surveys

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Natural Alkaloids (Caffeine, Theobromine and Theophylline) as Dielectric Capping Layers for Gold and Aluminum Gate Electrodes in Low Operating Voltage Organic Field-Effect Transistors

IEEE Journal on Flexible Electronics

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IEEE Journal on Flexible Electronics 2025年

作者： Irimia, Cristian Vlad Yumusak, Cigdem Ban, Boyuan Leeb, Elisabeth Mayr, Felix Schimanofsky, Corina Mardare, Andrei Ionut Molnar, Maximilian Alexander Teichert, Christian Sariciftci, Niyazi Serdar Irimia-Vladu, Mihai Institute of Physical Chemistry Altenberger Str. 69 Linz4040 Austria Graz University of Technology in Graz Master of Science student in Advanced Materials Science program Austria Montanuniversität Leoben Chair of Physics Department of Physics Mechanics and Electrical Engineering Franz Josef Str. 18 Leoben8700 Austria Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid-State Physics Hefei Institute of Physical Science Hefei230031 China Altenberger Str. 69 Linz4040 Austria National Institute for Lasers Plasma and Radiation Physics Magurele077125 Romania

Three natural alkaloids: caffeine, theobromine and theophylline are reported for their application as dielectric layers in organic field effect transistors (OFETs) utilizing both gold and aluminum gate electrodes. After careful purification of the materials, a detailed analysis using x-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), contact angle (CA), impedance spectroscopy, amplitude modulated kelvin probe force microscope (AM-KPFM) and cyclic voltammetry (CV) is performed. OFET devices operating at typical voltages between 2 and 4 V have been fabricated with the investigated alkaloid films processed via blade coating (caffeine) or vacuum processing (theobromine and theophylline). The dielectric properties of these three alkaloids are measured in impedance spectroscopy and negligible leakage currents are observed when deposited in thin films as dielectric layers in OFETs on aluminum electrodes. There is a high tendency of these molecules to crystallize and form uneven surfaces. When the thin film forming properties are carefully controlled, organic alkaloids can be employed in applications involving implantable, transient or even edible electronics. © 2022 IEEE.

关键词： Fourier transform infrared spectroscopy

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TREATMENT OF DIRECT BLUE 15 (DB15) BY FERED-FENTON

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Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University 2022年第3期57卷 363-372页

作者： Marlina, Elin Purwanto, Purwanto Sudarno, Sudarno Sari, Ajeng Arum Doctoral Program of Environmental Science School of Postgraduate Studies Universitas Diponegoro Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia Department of Environmental Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia Research Unit for Clean Technology Indonesian Institute of Sciences Bandung Indonesia

The Fered-Fenton process is one of the proposed options across the set of electrochemical oxidation processes. The primacy of this process is in-situ production of oxidation factors such as the hydroxyl radical (OH•). In this study, the Fered-Fenton process was adopted for the degradation of Direct Blue 15 (DB15) in wastewater by variating operational factors such as initial pH, applied current, and H2O2 and Fe2+ concentrations. The efficiency of color removal, chemical oxygen demand (COD) removal, functional group removal, and energy consumption of the Fered-Fenton process was evaluated. According to the results of this research, color and COD was degraded up to 90% and 86%, respectively, using graphite and Ti/Pt as electrodes. The presence of C-O absorption at wave number 1129.17 cm-1 also strengthens the presence of OH groups attached to the carbon chain. The energy consumption of this treatment was 20.4 kWh/L after 120 min. Therefore, the Fered-Fenton method is environmentally friendly for dye wastewater treatment. © 2022 science Press. All rights reserved.

关键词： Wastewater treatment

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Recent advances in Fenton and Fenton-like reaction mediated nanoparticle in cancer therapy

Biomedical Technology

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Biomedical Technology 2023年 3卷 40-51页

作者： Huijie Han Jiachen Li Hélder A. Santos Department of Biomedical Engineering University Medical Center Groningen University of Groningen Groningen 9713 AV the Netherlands W.J. Korf Institute for Biomedical Engineering and Materials Science University Medical Center Groningen University of Groningen Groningen 9713 AV the Netherlands Drug Research Program Division of Pharmaceutical Chemistry and Technology Faculty of Pharmacy FI-00014 Helsinki Finland

Fenton and Fenton like reaction have been well clarified as efficient reactive oxygen species (ROS) sources in tumor, and have been widely developed into a cancer treatment method. Meanwhile, transition metal-based nanomaterials with Fenton or Fenton like reaction characteristics also have been well explored as therapeutic agents for the cancer therapy, mainly in chemo-dynamic and ferroptosis induced cancer therapy. Herein,to summarize recent advances in Fenton and Fenton like reaction mediated nanoparticles for cancer therapy, in this minireview, we first introduced the mechanisms of Fenton and Fenton like reaction and two therapeutic methods based on Fenton and Fenton like reaction, and then we introduced the well-designed nanoparticles with Fenton reaction or Fenton-like reaction characteristics for the cancer therapies. Finally its challenges and perspectives are discussed.

关键词： Fenton reaction Fenton like reaction Cancer therapy Chemodynamic therapy Ferroptosis

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