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Influence of surface modified mixed metal oxide nanoparticles on the electrochemical and mechanical properties of polyurethane matrix

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Frontiers of Chemical Science and Engineering 2023年第1期17卷 1-14页

作者： joseph raj xavier Department of Chemistry Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesChennai-602105India

Newly synthesized functional nanoparticles,3-amino-1,2,4-triazole(ATA)/SiO_(2)—TiO_(2)were introduced to the polyurethane(PU)*** techniques were used to investigate the barrier properties of the synthesized PU—ATA/SiO_(2)—TiO_(2)nanocomposite coated steel *** natural seawater,electrochemical impedance spectroscopy experiments indicated outstanding protective behaviour for the PU—ATA/SiO_(2)—TiO_(2)coated *** coating resistance(Rcoat)of PU—ATA/SiO_(2)—TiO_(2)was determined to be 2956.90 kΩ·cm^(−2).The Rcoat of the PU—ATA/SiO_(2)—TiO_(2)nanocomposite coating was found to be over 50%higher than the PU *** current measured along the scratched surface of the PU—ATA/SiO_(2)—TiO_(2)coating was found to be very low(1.65 nA).The enhanced ATA/SiO_(2)—TiO_(2)nanoparticles inhibited the entry of electrolytes into the coating interface,as revealed by scanning electron microscopy/energy dispersive X-ray spectroscopy and X-ray diffraction analysis of the degradation *** contact angle testing validated the hydrophobic nature of the PU—ATA/SiO_(2)—TiO_(2)coating(θ=115.4°).When the concentration of ATA/SiO_(2)—TiO_(2)nanoparticles was 2 wt%,dynamic mechanical analysis revealed better mechanical ***,the newly synthesised PU—ATA/SiO_(2)—TiO_(2)nanocomposite provided excellent barrier and mechanical properties due to the addition of ATA/SiO_(2)—TiO_(2)nanoparticles to the polyurethane,which inhibited material degradation and aided in the prolongation of the coated steel’s life.

关键词： SiO_(2)/TiO_(2)nanoparticle nanocomposite coatings dynamic mechanical analysis electrochemical techniques corrosion colloids and interfaces

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耐化学腐蚀和疏水性的食品包装用含SnO_(2)生物纳米复合材料

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Transactions of Nonferrous Metals Society of China 2023年第7期33卷 2136-2154页

作者： joseph raj xavier CDHANALAKSHMI Shanmuga Sundari CHANDRAraj SPVINODHINI Department of Chemistry Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesChennai-602105Tamil NaduIndia Department of Chemistry Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and TechnologyChennai-600062Tamil NaduIndia

研究了聚(天冬酰胺-共苯丙氨酸)(P(Asn-co-Phe)/SnO_(2))对环氧树脂(EP)涂层防护性能的影响。电化学阻抗谱分析表明,与纯环氧树脂涂层相比,马口铁表面EP-P(Asn-co-Phe)/SnO_(2)纳米复合材料涂层具有更好的防护作用。EP-P(Asn-co-Phe)/Sn... 详细信息

研究了聚(天冬酰胺-共苯丙氨酸)(P(Asn-co-Phe)/SnO_(2))对环氧树脂(EP)涂层防护性能的影响。电化学阻抗谱分析表明,与纯环氧树脂涂层相比,马口铁表面EP-P(Asn-co-Phe)/SnO_(2)纳米复合材料涂层具有更好的防护作用。EP-P(Asn-co-Phe)/SnO_(2)纳米复合材料涂层的电阻(Rcoat)为3854.70 kΩ·cm^(2),比环氧树脂涂层的大38倍。扫描电化学显微镜分析表明,EP-P(Asn-co-Phe)/SnO_(2)的电流分布更小。通过XRD和SEM/EDX对降解产物进行分析,证实了功能化SnO_(2)颗粒对环氧树脂涂层防护能力的影响。EP-P(Asn-co-Phe)/SnO_(2)纳米复合材料涂层的水接触角为133°,证实了其疏水性。此外,与纯环氧树脂涂层相比,EP-P(Asn-co-Phe)/SnO_(2)纳米材料复合涂层具有更高的力学性能和抗菌活性。综上,由于在环氧树脂基体中添加了P(Asn-co-Phe)/SnO_(2)纳米颗粒,EP-P(Asn-co-Phe)/SnO_(2)纳米复合材料提供了出色的屏障和力学性能,从而阻碍了材料的降解,有助于延长涂层钢的寿命。

关键词：马口铁环氧树脂 SnO_(2) 纳米材料复合涂层共聚物热稳定性硬度

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Novel multifunctional epoxy based graphitic carbon nitride/silanized TiO_(2)nanocomposite as protective coatings for steel surface against corrosion and flame in the shipping industry

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Journal of Central South University 2024年第10期31卷 3394-3422页

作者： xavier joseph raj Department of Chemistry Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesChennai-602105Tamil NaduIndia

The chemical compound 3-(N-ethylamino)isobutyl)trimethoxysilane(EAMS)modified titanium dioxide(TiO_(2)),producing EAMS-TiO_(2),which was encased in graphitic carbon nitride(GCN)and integrated into epoxy resin(EP).The protective properties of mild steel coated with this nanocomposite in a marine environment were assessedusing electrochemical *** analysis(TGA)and Cone calorimetry tests demonstrated thatGCN/EAMS-TiO_(2)significantly enhanced the flame retardancy of the epoxy coating,reducing peak heat release rate(PHRR)and total heat release(THR)values by 88%and 70%,respectively,compared to pure *** spray testsindicated reduced water absorption and improved corrosion *** optimal concentration of 0.6 wt%GCNEAMS/TiO_(2)yielded the highest resistance,with the nanocomposite achieving a coating resistance of 7.50×10^(10)Ω·cm^(2)after 28 d in *** surface resistance of EP-GCN/EAMS-TiO_(2)was over 99.9 times higher than pure EP after onehour in *** analysis showed the lowest ferrous ion dissipation(1.0 nA)for EP-GCN/EAMS-TiO_(2)***-SEM and EDX analyses revealed improved breakdown products and a durable inert nanolayered *** exhibited excellent water resistance(water contact angle of 167°)and strong mechanical properties,withadhesive strength increasing to 18.3 MPa after 28 d in ***-GCN/EAMS-TiO_(2)shows potential as a coatingmaterial for the shipping industry.

关键词： graphitic carbon nitride nanocomposites flame retardant coating corrosion functional materials

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Impact of time between meniscal injury and isolated meniscus repair on post-operative outcomes:A systematic review

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World Journal of Clinical Cases 2025年第7期13卷 39-45页

作者： Kashif Javid xavier Akins Nicole G Lemaster Amer Ahmad Austin V Stone Department of Orthopaedic Surgery and Sports Medicine University of KentuckyLexingtonKY 40504United States

BACKGROUND Meniscal tears are one of the most common knee *** the diagnosis of a meniscal tear has been made,there are several factors physicians use to guide clinical *** influence of time between injury and isolated meniscus repair on patient outcomes is not well *** this relationship is important as it may influence clinical decision-making and can add to the preoperative patient education *** hypothesized that increasing the time from injury to meniscus surgery would worsen postoperative *** To investigate the current literature for data on the relationship between time between meniscus injury and repair on patient *** PubMed,Academic Search Complete,MEDLINE,CINAHL,and SPORTDiscus were searched for studies published between January 1,1995 and July 13,2023 on isolated meniscus *** criteria included concomitant ligament surgery,incomplete outcomes or time to surgery data,and *** demographics,time to injury,and postoperative outcomes from each study were abstracted and *** Five studies met all inclusion and exclusion *** were 204(121 male,83 female)patients *** of five(60%)studies determined that time between injury and surgery was not statistically significant for postoperative Lysholm scores(P=0.62),Tegner scores(P=0.46),failure rate(P=0.45,P=0.86),and International Knee Documentation Committee scores(P=0.65).Two of five(40%)studies found a statistically significant increase in Lysholm scores with shorter time to surgery(P=0.03)and a statistically significant association between progression of medial meniscus extrusion ratio(P=0.01)and increasing time to *** Our results do not support the hypothesis that increased time from injury to isolated meniscus surgery worsens postoperative ***-making primarily based on injury interval is thus not recommended.

关键词： Meniscus Meniscal Meniscus repair Meniscectomy Patient reported outcomes Postoperative outcomes Time to surgery Injury interval

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Comprehensive Characterization of Natural Cissus quadrangularis Stem Fiber Composites as an Alternate for Conventional FRP Composites

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Journal of Bionic Engineering 2018年第5期15卷 914-923页

作者： Suyambulingam Indran Robinson Dhas Edwin raj Brainerd Samuel Sundar Daniel joseph Selvi Binoj Department of Mechanical Engineering Rohini College of Engineering and Technology Anjugramam - 629401 Tamil Nadu India Department of Mechanical Engineering St. Xavier's Catholic College of Engineering Nagercoil - 629003 Tamil Nadu India Department of Metallurgical and Materials Engineering Indian Institute of Technology Roorkee - 247667 Uttarakhand India Department of Mechanical Engineering Sree Vidyanikethan Engineering College (Autonomous) Tirupati - 517102 Andhra Pradesh India

Health and sustainability are the major concerns that drive researchers to find novel materials to replace artificial hazardous materials. In this investigation, the mechanical properties of Cissus quadrangularis Stem Fiber （CQSF） reinforced with unsaturated polyester composite were optimized by varying the fiber length and content. To substantiate the findings, chemical property, thermal property, microstructure, and water absorption property were analyzed. Progressive enhancement of mechanical properties was observed with increasing the fiber content and fiber length up to 30 wt.% and 40 ram. However, beyond that limit, there was a decline in the strength due to improper bonding of fiber with matrix. Optimal values of mechanical property for CQSF composite were obtained at 30 wt.% fiber content and 40 mm fiber length, which are comparable with that of common artificial fiber-reinforced polymer composites.

关键词： CQSF mechanical properties thermogravimetric anlaysis microstructure water absorption

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Silk-based nerve guidance conduits with macroscopic holes modulate the vascularization of regenerating rat sciatic nerve

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Neural Regeneration Research 2025年第6期20卷 1789-1800页

作者： Carina Hromada Patrick Heimel Markus Kerbl LászlóGál Sylvia Nürnberger Barbara Schaedl James Ferguson Nicole Swiadek xavier Monforte Johannes C.Heinzel Antal Nógrádi Andreas H.Teuschl-Woller David Hercher Department Life Science Engineering University of Applied Sciences Technikum WienViennaAustria Austrian Cluster for Tissue Regeneration ViennaAustria Ludwig Boltzmann Institute for Traumatology The Research Center in Cooperation with AUVAViennaAustria University Clinic of Dentistry Medical University of ViennaViennaAustria Department of Plastic Reconstructive and Aesthetic SurgeryLandesklinikum Wiener Neustadt2700 Wiener NeustadtAustria Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary Medical University of Vienna Department of Orthopedics and Trauma SurgeryDevision of Trauma SurgeryViennaAustria Department of Hand- PlasticReconstructive and Burn SurgeryBG Unfallklinik TuebingenUniversity of TuebingenTuebingenGermany

Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the use of tubular nerve guidance conduits(tNGCs). However, the use of tNGCs results in poor functional recovery and central necrosis of the regenerating tissue, which limits their application to short nerve lesion defects(typically shorter than 3 cm). Given the importance of vascularization in nerve regeneration, we hypothesized that enabling the growth of blood vessels from the surrounding tissue into the regenerating nerve within the tNGC would help eliminate necrotic processes and lead to improved regeneration. In this study, we reported the application of macroscopic holes into the tubular walls of silk-based tNGCs and compared the various features of these improved silk^(+) tNGCs with the tubes without holes(silk^(–) tNGCs) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomography and histological analyses, we were able to prove that the use of silk^(+) tNGCs induced the growth of blood vessels from the adjacent tissue to the intraluminal neovascular formation. A significantly higher number of blood vessels in the silk^(+) group was found compared with autologous nerve transplants and silk^(–), accompanied by improved axon regeneration at the distal coaptation point compared with the silk^(–) tNGCs at 7 weeks postoperatively. In the 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth of blood vessels through the tubular walls of silk^(+) tNGCs, but without improved functional recovery at 12 weeks postoperatively. Our data proves that macroporous tNGCs increase the vascular supply of regenerating nerves and facilitate improved axonal regeneration in a short-defect model but not in a critical-size defect model. This study suggests that further optimizatio

关键词： axon regeneration blood vessel functional recovery macroporous nerve lesion peripheral nerve repair sciatic nerve silk-based nerve guidance conduit vascularization

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Hybrid Bacterial Foraging Optimization with Sparse Autoencoder for Energy Systems

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Computer Systems Science & Engineering 2023年第4期45卷 701-714页

作者： Helen josephine V L Ramchand Vedaiyan V.M.Arul xavier Joy Winston J A.Jegatheesan D.Lakshmi Joshua Samuel raj Business Analytics School of Business and ManagementChrist UniversityBangalore560029India Department of Computer Science and IT School of SciencesJain Deemed to be UniversityBangalore560027India Department of Computer Science and Engineering Karunya Institute of Technology and SciencesCoimbatore641114India College of Computer Studies University of Technology Bahrain18041Bahrain Institute of Computer Science and Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesChennai602105India Department of Computer Science and Engineering Panimalar Institute of TechnologyChennai600123India Department of Information Science&Engineering CMR Institute of TechnologyBengaluru560037India

The Internet of Things(IoT)technologies has gained significant interest in the design of smart grids(SGs).The increasing amount of distributed generations,maturity of existing grid infrastructures,and demand network transformation have received maximum *** essential energy storing model mostly the electrical energy stored methods are developing as the diagnoses for its procedure was becoming further *** dynamic electrical energy stored model using Electric Vehicles(EVs)is comparatively standard because of its excellent electrical property and flexibility however the chance of damage to its battery was there in event of overcharging or deep discharging and its mass penetration deeply influences the *** paper offers a new Hybridization of Bacterial foraging optimization with Sparse Autoencoder(HBFOA-SAE)model for IoT Enabled energy *** proposed HBFOA-SAE model majorly intends to effectually estimate the state of charge(SOC)values in the IoT based energy *** accomplish this,the SAE technique was executed to proper determination of the SOC values in the energy ***,for improving the performance of the SOC estimation process,the HBFOA is *** addition,the HBFOA technique is derived by the integration of the hill climbing(HC)concepts with the BFOA to improve the overall *** ensuring better outcomes for the HBFOA-SAE model,a comprehensive set of simulations were performed and the outcomes are inspected under several *** experimental results reported the supremacy of the HBFOA-SAE model over the recent state of art approaches.

关键词： Internet of things energy systems state of charge estimation machine learning deep learning metaheuristics

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Determining indoor air quality and identifying the origin of odour episodes in indoor environments

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Journal of Environmental Sciences 2009年第3期21卷 333-339页

作者： Eva Gallego xavier Roca Jose Francisco Perales xavier Guardino Environmental Centre Laboratory Polytechnic University of Catalonia (LCMA-UPC) Avda Diagonal 647 E 08028 Barcelona Spain National Centre of Work Conditions (INSHT) Dulcet 2-10 E 08034 Barcelona Spain

A methodology for identifying volatile organic compounds （VOCs） and determining air quality of indoor air has been developed. The air samples are collected using pump samplers by the inhabitants when they perceive odorous and/or discomfort episodes. Glass multi-sorbent tubes are connected to the pump samplers for the retention of VOC. The analysis is performed by automatic thermal desorption （ATD） coupled with gas chromatography-mass spectrometry （GC/MS）. This methodology can be applied in cases of sick building syndrome （SBS） evaluation, in which building occupants experience a series of varied symptoms that appear to be linked to time spent in the building. Chemical pollutants concentrations （e.g., VOC） have been described to contribute to SBS. To exemplify the methodology, a qualitative determination and an evaluation of existing VOC were performed in a dwelling where the occupants experienced the SBS symptoms. Higher total VOC （TVOC） levels were detected during episodes in indoor air （1.33 ±1.53 mg/m^3） compared to outdoor air （0.71± 0.46 mg/m^3）. The concentrations of individual VOCs, such as ethanol, acetone, isopropanol, 1-butanol, acetic acid, acetonitrile and 1-methoxy-2-propanol, were also higher than the expected for a standard dwelling. The external source of VOC was found to be an undeclared activity of storage and manipulation of solvents located at the bottom of a contiguous building.

关键词： indoor air thermal desorption TVOC VOC sick building syndrome

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Isoperimetric,Sobolev,and Eigenvalue Inequalities via the Alexandroff-Bakelman-Pucci Method:A Survey

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Chinese Annals of Mathematics,Series B 2017年第1期38卷 201-214页

作者： xavier CABRe Universitat Politecnica de Catalunya Departament de MatemktiquesDiagonal 64708028 BarcelonaSpain ICREA Pg.Lluis Companys 2308010 BarcelonaSpain.

This paper presents the proof of several inequalities by using the technique introduced by Alexandroff, Bakelman, and Pucci to establish their ABP estimate. First,the author gives a new and simple proof of a lower bound of Berestycki, Nirenberg, and Varadhan concerning the principal eigenvalue of an elliptic operator with bounded measurable coefficients. The rest of the paper is a survey on the proofs of several isoperimetric and Sobolev inequalities using the ABP technique. This includes new proofs of the classical isoperimetric inequality, the Wulff isoperimetric inequality, and the Lions-Pacella isoperimetric inequality in convex cones. For this last inequality, the new proof was recently found by the author, xavier Ros-Oton, and Joaquim Serra in a work where new Sobolev inequalities with weights came up by studying an open question raised by Haim Brezis.

关键词： Isoperimetric inequalities Principal eigenvalue Wulff shapes ABP estimate

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Performance Back-deduction from a Loading to Flow Coefficient Map:Application to Radial Turbine

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Journal of Thermal Science 2012年第6期21卷 509-517页

作者： xavier CARBONNEAU Nicolas BINDER Université de Toulouse Institut Supérieur de l'Aéronautique et de l'Espace(ISAE)10avenue Edouard Belin BP 54032 31400 ToulouseFrance

Radial turbine stages are often used for applications requiring off-design operation,as turbocharging for *** off-design ability of such stages is commonly analyzed through the traditional turbine map,plotting the reduced mass-flow against the pressure-ratio,for reduced-speed ***,some alternatives are possible,such as the flow-coefficient(Ψ)to loading-coefficient(φ)diagram where the pressure-ratio lines are actually straight lines,very convenient property to perform prediction.A robust method re-creating this map from a predicted Ψ-φ diagram is *** work has shown that this back-deduction quality,without the use of any loss models,depends on the knowledge of an intermediate pressure-ratio.A modelization of this parameter is then *** comparison with both experimental and CFD results is presented,with quite good agreement for mass flow rate and rotational speed,and for the intermediate pressure *** last part of the paper is dedicated to the application of the intermediate pressure-ratio knowledge to the improvement of the deduction of the pressure ratio lines in the Ψ-φ *** this improvement,the back-deduction method of the classical map is structured,applied and evaluated.

关键词： Radial turbine off-design flow coefficient load coefficient performance

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