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Ultrathin Polymeric Platform for Drug-Eluting Stent: A proof of concept

Procedia CIRP 2024年 125卷 243-248页

作者： A. Bosch E. Casanova-Batlle S. Ausellé-Bosch E. Polonio-Alcalá T. Puig J. Ciurana A.J. Guerra Eurecat Technology Centre of Catalonia Unit of Advanced Manufacturing Systems 08290 Cerdanyola del Vallès Spain Product Process and Production Engineering Research Group (GREP) Department of Mechanical Engineering and Industrial Construction University of Girona 17003 Girona Spain New Therapeutic Targets Laboratory (TargetsLab) – Oncology Unit Department of Medical Sciences Faculty of Medicine University of Girona 17003 Girona Spain

Recent innovations in Drug-Eluting Stents (DES) technology have led to the development of new stents with further reduction in strut width, the ultrathin DES, with struts thinner than 70 µm. Ultrathin DES may further improve the efficacy and safety profile of Percutaneous Coronary Intervention (PCI) by reducing the risk of target-lesion and target-vessel failures compared to the current-generation DES. However, the ultrathin DES metallic platform still presents some associated problems, such as biofilm formation, infection, and migration, all related to the cellular response. The present work aims to produce an ultrathin permanent polymeric platform for a new generation of polymeric drug-eluting stents (PDES). In this work, the cellular response was compared with the traditional stainless steel (SS316L) and polycaprolactone (PCL) to determine whether these polymers could address this challenge. An innovative method of tubular 3D micro stereolithography tubular (ST3DT) was used. Different PDES platforms were fabricated with different polymeric materials (based on polyurethane and urethane dimethacrylate). Subsequently, HFL1 fibroblasts were seeded on the PDES, PCL and SS316L for 3 days. The findings from the assays of cell biocompatibility and proliferation (75%PCL), coupled with the successful fabrication of stent struts below 70 µm using the Surgical Guide resin and the ST3DT method, suggest that resin is a promising candidate for a PDES.

关键词： stent medical devices additive manufacturing stereolithography

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Performance of Artemisia absinthium as an Ecological Corrosion Inhibitor in the Industrial Pickling process

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Journal of Bio- and Tribo-Corrosion 2024年第1期10卷 1-18页

作者： Lamghafri, Selma Daoudi, Walid El Aatiaoui, Abdelmalik Dagdag, Omar Kim, Hansang Benhiba, Fouad Berisha, Avni Barrahi, Asma Nik, W. B. Wan Zarrouk, Abdelkader Lamhamdi, Abdellatif Laboratory of Applied Sciences National School of Applied Sciences Al-Hoceima Abdelmalek Essaadi University Tetouan Morocco Department of Chemistry Multidisciplinary Faculty of Nador University Mohamed I Nador60700 Morocco Department of Mechanical Engineering Gachon University Seongnam13120 Korea Republic of Laboratory of Advanced Materials and Process Engineering Faculty of Sciences Ibn Tofail University Kenitra14000 Morocco Department of Chemistry Faculty of Natural and Mathematics Science University of Prishtina Prishtina10000 Laboratoire des Matériaux Nanotechnologie et Environnement Faculté des Sciences Université Mohammed V Rabat Morocco Materials Science-Nanochemistry Research Group NanoAlb-Unit of Albanian Nanoscience and Nanotechnology Tirana1000 Albania Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu 21030 Terengganu Kuala Nerus Malaysia

The chemical composition and inhibitory potency of essential oil extracted from the Artemisia absinthium plant cultivated in eastern Morocco have been evaluated. The RAO oil constituents were characterized by (GC-MS) and FTIR techniques, the main components were eucalyptol (34.82%), camphor (17.25%), pulegone (12.99%), β-pinene (8.2%), terpene-4-ol (4.2%). The hydro-distilled oil was evaluated as an ecologically corrosion inhibitor while using mild steel (MS) in molar hydrochloric acid. The comportment of the metal in the acidic electrolyte including various concentration of the oil has been examined by the gravimetric method as well as the electrochemical techniques. The inhibitory performance attained 92% at the concentration 2 g/l. Polarization investigation (PDP) demonstrated that the oil was a mixed-type inhibitor and verified Langmuir isotherm model, while the EIS study showed that the corrosion process is controlled by transferring charge. Additionally, the activation and thermodynamic aspects were examined and confirmed the growth of energy barrier and blockage of active site that led to MS corrosion. The steel morphology surface was analyzed using SEM and UV–Vis techniques. Finally, the computed theoretical parameters have been interpreted. These findings provide important information regarding the anticorrosion ability of this essential oil, implying its potential industrial applications. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s);author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

关键词： Corrosion inhibitors

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Bioplastic reinforced with parthenocarpic date palm fibers:Characterization and microorganisms involved in degradation

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Food Bioscience 2023年第1期51卷 1202-1211页

作者： Hammadi Hamza Imen Bettaieb Ameni Benltoufa Achraf Ghorbal Hela Ben Ahmed Walid Elfalleh Arid and Oases Cropping Laboratory Arid Area InstituteMedenine4119Tunisia Energy WaterEnvironment and Process Laboratory(LR18ES35)National Engineering School of GabesUniversity of GabesGabes6072Tunisia Research Unit Advanced Materials Applied MechanicsInnovative Processes and EnvironmentUR22ES04Higher Institute of Applied Sciences and Technology of Gabes(ISSATG)University of GabesGabes6072Tunisia Laboratory of Plant Soil and Environment Interactions LR21ES01 Department of BiologyFaculty of Science of Tunis2092 TunisUniversity of Tunis EL ManarTunis1068Tunisia

The environment suffers more and more from the accumulation of plastics made by petrochemical rows,which are *** is why this study aims to develop bio-based films by incorporating fibers concentrate of parthenocarpic date(FCPD)as easily available *** FCPD based film showed enhanced thickness,water solubility,phenol content and antioxidant ***,the transparency was reduced which enhanced the film opacity by the addition of *** electronic microscopy(SEM)showed homogeneity between fibers and the constituents of the *** addition of FCPD did not change the FTIR peaks in comparison with starch-based *** hydroxyl index value and water contact angle showed that the hydrophilicity increases with the film FCPD *** addition,the FCPDs have enhanced the microbial biodegradation of the developed films as showed by *** PCR using specific primers for nine target microbial groups showed that fungi were the predominant agent of the *** bacteria,realtime PCR showed thatβ-Proteobacteria,Acidobacteria,Bacteriodetes andα-Proteobacteria groups were involved in film biodegradation.

关键词： Parthenocarpic date Fibers Bioplastic Biodegradation SEM qPCR

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Mixed Matrix Membranes Composed of Graphene-Based Derivatives as Additives in Pvam for Co2 Capture

SSRN

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SSRN 2024年

作者： Baker, James Perinu, Cristina Psarrou, Maria Mordal Lucasen, Sigmund Kusuma, Victor Muldoon, Patrick Asimakopoulou, Akrivi Hopkinson, David Economopoulos, Solon P. U.S. Department of Energy National Energy Technology Laboratory 626 Cochrans Mill Rd PittsburghPA15236 United States NETL Support Contractor 626 Cochran Mill Rd PittsburghPA15236 United States Advanced Optoelectronic Nanomaterials Research Unit Department of Chemistry Norwegian University of Science and Technology Trondheim7491 Norway Advanced Renewable Technologies & Environmental Materials in Integrated Systems ARTEMIS Chemical Process and Energy Resources Institute CPERI Centre for Research and Technology Hellas CERTH Thermi Thessaloniki57001 Greece

Graphene-based mixed matrix membranes (MMMs) that employ facilitated transport of carbon dioxide were prepared and tested for use in post-combustion carbon capture. Two novel graphene hybrids were synthesized using exfoliated graphene (G) and GO as a basis and were then appended with triethylene glycol (TEG) and N-(2-Hydroxyethyl)ethylenediamine (EDAOH) functional groups, respectively. Unfunctionalized GO nanoparticles were commercially obtained for comparison to the synthesized nanoparticles. The three additives were tested as nanofillers with loadings of 0.5 wt% and, in one case, 1 wt% in polyvinylamine (PVAm) matrices for CO2 and N2 gas permeability using humidified mixed gas. MMMs using G-TEG filler particles resulted in improved CO2/N2 selectivity, while GO-EDAOH fillers improved both CO2 permeability and CO2/N2 selectivity compared to neat PVAm. Unfunctionalized GO fillers resulted in no significant change in gas transport properties. Mechanical properties were also tested. The addition of GO or GO-EDAOH filler particles resulted in improvements in storage modulus as well as higher glass transition temperature, while G-TEG filler particles yielded a less significant change compared to neat PVAm. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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Reducibility of high-grade pellets directly reduced in hydrogen atmosphere: Modeling and experimental procedure

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International Journal of Hydrogen Energy 2025年 144卷 69-84页

作者： Sadeghi, B. Cavaliere, P. Ramos Goncalves, N. Bayat, M. Aminaei, M. Laska, A. Drewniak, A. Erich Schmid Institute of Materials Science Austrian Academy of Sciences Jahnstraße 12 LeobenA-8700 Austria Department of Innovation Engineering University of Salento Via per Arnesano Lecce73100 Italy Process Metallurgy Research Unit Faculty of Technology University of Oulu Oulu90570 Finland Faculty of Mechanical Engineering and Ship Technology Gdańsk University of Technology G. Narutowicza 11/12 Gdansk80-233 Poland Advanced Materials Center Faculty of Electronics Telecommunications and Informatics Gdansk University of Technology G. Narutowicza 11/12 Gdansk80-233 Poland

The paper analyzes the behavior of high-grade pellets specially developed for hydrogen direct reduction (HDRI). The reducibility of these pellets depends largely on their composition, porosity, pore structure and distribution. X-ray tomographic analyzes of the unreduced pellets showed different degrees of porosity as well as different pore sizes and distributions in each observed pellet. This prompted us to investigate the reduction behavior of each individual pellet at 1000 °C and 1 bar. The effect of composition on the reduction kinetics was analyzed using HSC software to isolate the effect of composition from the porosity structure of the pellets. After reduction, X-ray tomographic observations enabled the measurement of porosity variation in each pellet studied. The porosity variation data was used to validate a finite element model developed to analyze porosity evolution using COMSOL Multiphysics. The study found that larger pores have higher activity and a tendency to coalesce, forming interconnected networks that allow for better gas and heat diffusion. The results showed that porosity increased from approximately 30 % to approximately 65 % after reduction, and the close agreement between the experimental data and the FEM simulations confirmed the accuracy of the model. It was found that the presence of CaO and MgO increased the porosity and thus improved the reducibility, while the inhibitory effects of SiO2 and Al2O3 were minimized. These results contribute significantly to the optimization of pellet composition and structure for efficient and uniform reduction of iron oxides in hydrogen atmospheres. © 2025 The Authors

关键词： Activated alumina

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Physics-informed radial basis network (PIRBN): A local approximating neural network for solving nonlinear PDEs

arXiv

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arXiv 2023年

作者： Bai, Jinshuai Liu, Gui-Rong Gupta, Ashish Alzubaidi, Laith Feng, Xi-Qiao Gu, YuanTong School of Mechanical Medical and Process Engineering Queensland University of Technology BrisbaneQLD4000 Australia ARC Industrial Transformation Training Centre-Joint Biomechanics Queensland University of Technology BrisbaneQLD4000 Australia Department of Aerospace Engineering and Engineering Mechanics University of Cincinnati OH45221 United States Queensland Unit for Advanced Shoulder Research BrisbaneQLD4000 Australia Greenslopes Private Hospital BrisbaneQLD4120 Australia Institute of Biomechanics and Medical Engineering AML Department of Engineering Mechanics Tsinghua University Beijing100084 China

Our recent intensive study has found that physics-informed neural networks (PINN) tend to be local approximators after training. This observation led to the development of a novel physics-informed radial basis network (PIRBN), which is capable of maintaining the local approximating property throughout the entire training process. Unlike deep neural networks, a PIRBN comprises only one hidden layer and a radial basis "activation" function. Under appropriate conditions, we demonstrated that the training of PIRBNs using gradient descendent methods can converge to Gaussian processes. Besides, we studied the training dynamics of PIRBN via the neural tangent kernel (NTK) theory. In addition, comprehensive investigations regarding the initialisation strategies of PIRBN were conducted. Based on numerical examples, PIRBN has been demonstrated to be more effective than PINN in solving nonlinear partial differential equations with high-frequency features and ill-posed computational domains. Moreover, the existing PINN numerical techniques, such as adaptive learning, decomposition and different types of loss functions, are applicable to PIRBN. The programs that can regenerate all numerical results are available at https://***/JinshuaiBai/PIRBN. Copyright © 2023, The Authors. All rights reserved.

关键词： Partial differential equations

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Multi-trench-gate Cell Concept for Low Voltage Superjunction Power MOSFETs

Multi-trench-gate Cell Concept for Low Voltage Superjunction...

引用

International Symposium on Power Semiconductor Devices and Ics (ISPSD)

作者： K. Eikyu A. Sakai T. Yamashita A. Shimomura H. Yanagigawa K. Mori Advanced Device Technology Department Renesas Electronics Corporation Hitachinaka Ibaraki Japan Power Device Technology Department Process Technology Unit Renesas Electronics Corporation Hitachinaka Ibaraki Japan

ISBN: (数字)9781728148366

ISBN: (纸本)9781728148373

Multi-trench-gate (multi-TG) cell concept is proposed for below 60V class superjunction (SJ) power MOSFETs. The proposed SJ cell improves manufacturability by relaxing too aggressive column pitch narrowing while keeping specific on-state resistance R sp reduction. Two-TG SJ cell is designed by fully utilizing TCAD and over 20% Rsp reduction with good charge imbalance margin against our 4th generation single gate SJ cell is obtained. The 1st experimental demonstration results in 13% R sp reduction and slightly lower BV dss than target because of the insufficient tuning of column implantation mask patterning and insufficient optimization of design parameters of termination region.

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Electrodeposited Polyaniline on Graphite Felt (Pani/Gf) Improves Start-Up Time and Acetate Productivity of Microbial Electrosynthesis Cell

SSRN

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SSRN 2024年

作者： Kim, Eunseo Kim, Minsoo Li, Shuwei Song, Young Eun Maile, Nagesh C. Jang, Min Son, Sang Hwan Jae, Jungho Kim, Hyoung-Il Kim, Jung Rae School of Chemical Engineering Pusan National University Busan46241 Korea Republic of School of Chemical Engineering and Technology Xi’an Jiaotong University Xi’an China Department of Gastroenterology First Affiliated Hospital of Xi’an Jiaotong University 277 West Yanta Road Shanxi Xi’an710061 China Advanced Biofuel and Bioproducts Process Development Unit Lawrence Berkeley National Laboratory EmeryvilleCA94608 United States School of Civil & Environmental Engineering Yonsei University Seoul03722 Korea Republic of Institute for Environmental Energy Pusan National University Busan46241 Korea Republic of Kwangwoon University Korea Republic of

Microbial electrosynthesis (MES) for CO2 capture and utilization has been highlighted for carbon-negative intermediate chemical production. Interface engineering of the electrode surface promotes electron uptake by electroactive bacteria through extracellular electron transport systems and is essential for enhancing acetate production from CO2. This study developed a polyaniline (PANI) electrodeposited graphite felt (GF) electrode to enhance acetate production in MES. The high biocompatibility and electrical conductivity of PANI promoted biofilm formation by increasing the interfacial interaction of electroactive bacteria. The physicochemical properties of PANI/GF were analyzed by Eenergy dispersive X-ray spectroscopy, Fourier transform infrared spectrometry, Raman spectroscopy, and X-ray diffraction. PANI/GF produced higher acetate levels (61.8 g/m2cat/day) from CO2 than the unmodified GF (41.6 g/m2cat/day). The specific capacitance (Cp) of PANI/GF (0.018 Fg-1) was 8.7 times higher than that of the unmodified GF (0.002 Fg-1). The PANI/GF electrodes promoted biofilm formation on the surface and improved the enrichment time of MES. In conclusion, the PANI/GF-modified electrodes facilitate electroactive bacteria–electrode interactions and extracellular electron transfer to improve the performance of MES. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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Recent advancements in the targeted delivery of Gemcitabine: Harnessing nanomedicine for enhanced cancer therapy

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OpenNano 2023年 13卷

作者： Pourmadadi, Mehrab Aslani, Ali Hassan, Dilawar Sani, Ayesha Rahdar, Abbas I． Medina, Dora Abdouss, Majid Romanholo Ferreira, Luiz Fernando Department of Biotechnology School of Chemical Engineering College of Engineering University of Tehran Tehran Iran Department of Chemistry Amirkabir University of Technology Tehran Iran Tecnologico de Monterrey School of Engineering and Sciences Atizapan de Zaragoza Estado de Mexico 52926 Mexico Department of Physics Faculty of Sciences University of Zabol Zabol 538-98615 Iran Tecnologico de Monterrey Institute of Advanced Materials for Sustainable Manufacturing Nuevo Leon Monterrey 64849 Mexico Graduate Program in Process Engineering Tiradentes University (UNIT) Av. Murilo Dantas 300 Farolândia Aracaju-Sergipe 49032-490 Brazil Institute of Technology and Research (ITP) Tiradentes University (UNIT) Av. Murilo Dantas 300 Farolândia Aracaju-Sergipe 49032-490 Brazil

Gemcitabine (GEM) is a chemotherapeutic drug widely used for treating pancreatic cancer and other cancers. Despite its efficacy, GEM is associated with adverse side effects and tumor resistance, hampering its therapeutic outcomes. To address these challenges, innovative strategies have emerged to enhance GEM delivery. This comprehensive review explores various distribution systems, including polymer-based platforms, liposomes, and inorganic nanoparticles, highlighting their unique characteristics for improving GEM efficacy in cancer treatment. Additionally, we discuss the promising approach of codelivery with genes and present several methods for augmenting GEM's chemotherapeutic properties. Our findings shed light on novel insights and provide recommendations for overcoming the limitations associated with GEM, guiding researchers and clinicians toward more effective cancer therapies. © 2023 The Authors

关键词： Co-delivery Inorganic nanoparticles Lipid-based nanoparticles Polymeric nanoparticles

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A review on the potential of filamentous fungi for microbial self-healing of concrete

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Fungal Biology and Biotechnology 2021年第1期8卷 1页

作者： Van Wylick, Aurélie Monclaro, Antonielle Vieira Elsacker, Elise Vandelook, Simon Rahier, Hubert De Laet, Lars Cannella, David Peeters, Eveline Research Group of Architectural Engineering Department of Architectural Engineering Vrije Universiteit Brussel Pleinlaan 2 Brussels B-1050 Belgium Research Group of Microbiology Department of Bioengineering Sciences Vrije Universiteit Brussel Pleinlaan 2 Brussels B-1050 Belgium PhotoBioCatalysis Unit–BTL–Ecole interfacultaire de Bioingénieurs (EIB) Université Libre de Bruxelles Avenue F.D. Roosevelt 50 Brussels B-1050 Belgium Research Group of Physical Chemistry and Polymer Science Department of Materials and Chemistry Vrije Universiteit Brussel Pleinlaan 2 Brussels B-1050 Belgium Newcastle University Hub for Biotechnology in the Built Environment Devonshire Building Newcastle upon Tyne NE1 7RU United Kingdom Center for Microbial Ecology and Technology (CMET) Department of Biotechnology Faculty of Bioscience Engineering Ghent University Coupure Links 653 Ghent B-9000 Belgium Center for Advanced Process Technology and Urban Resource Efficiency (CAPTURE) Frieda Saeysstraat Ghent B-9052 Belgium

Concrete is the most used construction material worldwide due to its abundant availability and inherent ease of manufacturing and application. However, the material bears several drawbacks such as the high susceptibility for crack formation, leading to reinforcement corrosion and structural degradation. Extensive research has therefore been performed on the use of microorganisms for biologically mediated self-healing of concrete by means of CaCO₃ precipitation. Recently, filamentous fungi have been recognized as high-potential microorganisms for this application as their hyphae grow in an interwoven three-dimensional network which serves as nucleation site for CaCO₃ precipitation to heal the crack. This potential is corroborated by the current state of the art on fungi-mediated self-healing concrete, which is not yet extensive but valuable to direct further research. In this review, we aim to broaden the perspectives on the use of fungi for concrete self-healing applications by first summarizing the major progress made in the field of microbial self-healing of concrete and then discussing pioneering work that has been done with fungi. Starting from insights and hypotheses on the types and principles of biomineralization that occur during microbial self-healing, novel potentially promising candidate species are proposed based on their abilities to promote CaCO₃ formation or to survive in extreme conditions that are relevant for concrete. Additionally, an overview will be provided on the challenges, knowledge gaps and future perspectives in the field of fungi-mediated self-healing concrete. © 2021, The Author(s).

关键词： Biomineralization Calcium carbonate Fungi Self-healing concrete

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