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Multifunctional HDPE/Cu biocidal nanocomposites for MEX additive manufactured parts: Perspectives for the defense industry

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Defence Technology（防务技术） 2024年第8期38卷 16-32页

作者： nectarios vidakis Nikolaos Michailidis Markos Petousis Nektarios K.Nasikas Vassilios Saltas Vassilis Papadakis Nikolaos Mountakis Apostolos Argyros Mariza Spiridaki Ioannis Valsamos Department of Mechanical Engineering Hellenic Mediterranean UniversityHeraklion 71410Greece Physical Metallurgy Laboratory Mechanical Engineering DepartmentSchool of EngineeringAristotle University of ThessalonikiThessaloniki 54124Greece Centre for Research&Development of Advanced Materials(CERDAM) Center for Interdisciplinary Research and InnovationBalkan CentreThessaloniki 57001Greece Division of Mathematics and Engineering Sciences Department of Military SciencesHellenic Army AcademyVari GR16673AtticaGreece Department of Electronic Engineering Hellenic Mediterranean UniversityChania 73133Greece Department of Industrial Design and Production Engineering University of West AtticaAthens 12244Greece Institute of Electronic Structure and Laser Foundation for Research and Technology-HellasHeraklion 70013Greece

In this study, we investigated the performance improvement caused by the addition of copper(Cu)nanoparticles to high-density polyethylene(HDPE) matrix material. Composite materials, with filler percentages of 0.0, 2.0, 4.0, 6.0, 8.0, and 10.0 wt% were synthesized through the material extrusion(MEX)3D printing technique. The synthesized nanocomposite filaments were utilized for the manufacturing of specimens suitable for the experimental procedure that followed. Hence, we were able to systematically investigate their tensile, flexural, impact, and microhardness properties through various mechanical tests that were conducted according to the corresponding standards. Broadband Dielectric Spectroscopy was used to investigate the electrical/dielectric properties of the composites. Moreover, by employing means of Raman spectroscopy and thermogravimetric analysis(TGA) we were also able to further investigate their vibrational, structural, and thermal properties. Concomitantly, means of scanning electron microscopy(SEM), as well as atomic force microscopy(AFM), were used for the examination of the morphological and structural characteristics of the synthesized specimens, while energy-dispersive Xray spectroscopy(EDS) was also performed in order to receive a more detailed picture on the structural characteristics of the various synthesized composites. The corresponding nanomaterials were also assessed for their antibacterial properties regarding Staphylococcus aureus(S. aureus) and Escherichia coli(E. coli) with the assistance of a method named screening agar well diffusion. The results showed that the mechanical properties of HDPE benefited from the utilization of Cu as a filler, as they showed a notable improvement. The specimen of HDPE/Cu 4.0 wt% was the one that presented the highest levels of reinforcement in four out of the seven tested mechanical properties(for example, it exhibited a 36.7%improvement in the flexural strength, compared to the pure matrix). At the same

关键词： High-density polyethylene(HDPE) Copper(Cu) Material extrusion(MEX) Mechanical performance Electrical properties Antibacterial Defense and security

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Biochar filler in MEX and VPP additive manufacturing:characterization and reinforcement effects in polylactic acid and standard grade resin matrices

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Biochar 2023年第1期5卷 674-694页

作者： nectarios vidakis Dimitrios Kalderis Markos Petousis Emmanuel Maravelakis Nikolaos Mountakis Nikolaos Bolanakis Vassilis Papadakis Department of Mechanical Engineering Hellenic Mediterranean University71410 HeraklionGreece Department of Electronic Engineering Hellenic Mediterranean University73133 ChaniaGreece Institute of Electronic Structure and Laser of the Foundation for Research and Technology-Hellas 71110 HeraklionGreece

The development of sustainable and functional biocomposites remains a robust research and industrial ***,the efficiency of using eco-friendly biochar as reinforcement in Additive Manufacturing(AM)was *** AM technologies were applied,i.e.,vat photopolymerization(VPP)and material extrusion(MEX).A standard-grade resin in VPP and the also eco-friendly biodegradable Polylactic Acid(PLA)in the MEX process were selected as polymeric *** was prepared in the study from olive *** were developed for both 3D printing processes at different biochar *** were 3D-printed and mechanically tested after international test *** Analysis and Raman revealed the thermal and structural characteristics of the *** and fractographic features were derived,among others,with Scanning Electron Microscopy(SEM)and Atomic Force Microscopy(AFM).Biochar was proven to be sufficient reinforcement agent,especially in the filament MEX process,reaching more than 20%improvement at 4 wt.%loading in tensile strength compared to the pure PLA control *** the VPP process,results were not as satisfactory,still,a 5%improvement was achieved in the flexural strength with 0.5 wt.%biochar *** findings prove the strong potential of biochar-based composites in AM applications,too.

关键词： Biochar Resin Polylactic acid(PLA) Vat photopolymerization(VPP) Material extrusion(MEX) Mechanical characterization

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Clinical results of linezolid in arthroplasty and trauma related infections

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World Journal of Orthopedics 2014年第2期5卷 151-157页

作者： James Joel Simon Matthew Graham Adam Peckham-Cooper nectarios Korres Helen Tsouchnica Eleftherios Tsiridis Academic Orthopaedic and Trauma Unit Leeds Teaching Hospitals Leeds School of Medicine Leeds LS1 3EX United Kingdom Royal Liverpool University Hospital Liverpool L7 8XP United Kingdom Academic Orthopaedics and Trauma Unit Division of Surgery Aristotle University Medical School University Campus 54 124 Thessaloniki Greece

AIM: To analyse the management of patients treated with linezolid for orthopaedic ***: Twenty-two patients with orthopaedic related infections receiving a course of linezolid were reviewed retrospectively. Patients were classified into either post trauma, post arthroplasty and non trauma related infections. A diagnosis of infection was based on clinical findings, positive microbiological specimens, and positive signs of infection on radiological imaging and raised inflammatory markers. Pathogens isolated, inflammatory markers both at presentation and at final follow up, length of linezolid treatment, adverse drug reactions, concomitant anti-microbial therapy, length of hospital stay and any surgical interventions were ***: Infections were classified as post arthroplasty(n = 10), post trauma surgery(n = 8) or nontrauma related infections(n = 4). Twenty patients(91%) underwent surgical intervention as part of their treatment. The number of required surgical procedures ranged from 1 to 6(mean = 2.56). Mean total length of stay per admission was 28.5 d(range 1-160 d). Furthermore, the mean duration of treatment with linezolid of patients who had resolution of symptoms was 31 d(range 10-84 d). All patients within this group were discharged on oral linezolid. Pathogens isolated included methicillin resistant Staphylococcus aureus, coagulase negative staphylococci, coliforms, enterococcus, Staphylococcus epidermidis, streptococcus viridans, Escherichia coli, group B streptococcus and pseudomonas. An overall 77% of patients demonstrated resolution of infections at follow-up, with mean C-reactive protein reducing from 123 mg/L to 13.2 mg/***: This study demonstrates that the use of linezolid offers excellent efficacy in orthopaedic related infections when used alongside appropriate surgical management.

关键词： Antibiotic resistance Linezolid Orthopaedic infections Osteomyelitis Periprosthetic joint infection

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