Browsing NTNU Open by Author "Grammatikos, Sotirios"
Now showing items 1-20 of 55
-
3D printed thermoelectric polyurethane/multiwalled carbon nanotube nanocomposites: A novel approach towards the fabrication of flexible and stretchable organic thermoelectrics
Tzounis, Lazaros; Petousis, Markos; Grammatikos, Sotirios; Vidakis, Nectarios (Peer reviewed; Journal article, 2020)Three-dimensional (3D) printing of thermoelectric polymer nanocomposites is reported for the first time employing flexible, stretchable and electrically conductive 3D printable thermoplastic polyurethane (TPU)/multiwalled ... -
Additive Manufacturing of multifunctional Polylactic Acid (PLA) – Multiwalled Carbon Nanotubes (MWCNTs) Nanocomposites Nanocomposites
Vidakis, Nectarios; Petousis, Markos; Kourinou, Mirto; Velidakis, Emmanouil; Mountakis, Nikolaos; Fischer-Griffiths, Peder Erik; Grammatikos, Sotirios; Tzounis, Lazaros (Journal article; Peer reviewed, 2021) -
Additive manufacturing of multilayered polymer composites: Durability assessment
Payami Golhin, Ali; Srivastava, Chaman; Tingstad, Jens Fossan; Sole, Aditya Suneel; Strandlie, Are; Grammatikos, Sotirios (Chapter, 2022)This study examines the impact of additive manufacturing (AM) settings on the durability of 3D-printed polymer composite objects in terms of object color appearance and corresponding mechanical properties when subjected ... -
Advanced RF/microwave Systems for Sensing and Communication Applications
Alam, Tanjir (Doctoral theses at NTNU;2023:191, Doctoral thesis, 2023)As the fifth generation (5G) and beyond networks as well as the Internet-of-things (IoT) continue to expand and become more prevalent in various industries, we will encounter connected devices almost everywhere. Consequently, ... -
Assessment of long-term performance of natural fibre reinforced polymer composites with recyclable polymer matrices under different environmental ageing conditions
Das, Subrata Chandra (Doctoral theses at NTNU;2024:167, Doctoral thesis, 2024)The usage of natural fibre composites (NFCs) has been increasing recently to replace traditional composite materials in different sectors due to climate change and sustainability issues. However, natural fibres are ... -
Carbon Nanotube-Based Molecularly Imprinted Polymer Antenna Sensor for Ambient Methanol Vapor Detection
Hossain, Kabir; Cowen, Todd; Grammatikos, Sotirios; Cheffena, Michael (Peer reviewed; Journal article, 2024)This study introduces a novel antenna sensor that incorporates molecularly imprinted polymers (MIPs) to selectively detect methanol vapor under room temperature conditions, thereby eliminating the requirement for preheating ... -
Comparative Life Cycle Assessment of Cotton and Other Natural Fibers for Textile Applications
La Rosa, Angela Daniela; Grammatikos, Sotirios (Journal article; Peer reviewed, 2019)Among natural fibers, such as cotton, silk, wool, flax, hemp, etc., cotton is the one that takes up the highest percentage in the textile market. Nevertheless, there are obstacles associated with its cultivation; it is ... -
A comparative study on the effect of hot/wet and hot/dry aging environments on the degradation of filament winded composites
Srivastava, Chaman; Strandlie, Are; Alcock, Benjamin; Grammatikos, Sotirios (Chapter, 2022)Predicting the long-term response of polymer composite materials is a continuous challenge to the composite industry. The service aging of structural composites has different effects on composites’ physicochemical behavior ... -
Comparison of the effect of thermal and hygrothermal sub-Tg aging on the durability and appearance of multilayered filament wound composite structure
Srivastava, Chaman; Alcock, Benjamin; Strandlie, Are; Grammatikos, Sotirios (Peer reviewed; Journal article, 2024)The study conducts an experimental investigation to compare the effect of accelerated aging on a glass fiber/vinylester matrix filament wound composite. Two static aging conditions, thermal and hygrothermal, were chosen. ... -
Development and Optimization of Medical-Grade MultiFunctional Polyamide 12-Cuprous Oxide Nanocomposites with Superior Mechanical and Antibacterial Properties for Cost-Effective 3D Printing
Vidakis, Nectarios; Petousis, Markos; Michailidis, Nikolaos; Grammatikos, Sotirios; David, Constantine N.; Mountakis, Nikolaos; Argyros, Apostolos; Boura, Orsa (Peer reviewed; Journal article, 2022)In the current study, nanocomposites of medical-grade polyamide 12 (PA12) with incorporated copper (I) oxide (cuprous oxide-Cu2O) were prepared and fully characterized for their mechanical, thermal, and antibacterial ... -
Development of injection molding tooling
Mariendal, Anders Brunsberg; Elnæs, Ole Kristian (Bachelor thesis, 2021)Denne bacheloroppgaven omhandler utviklingen av en sprøytestøpingsform til et gjenbrukbart munnbind i medisinsk silikon som skal produseres ved hjelp av 3D-printing. I fokus av utviklingsprosessen står modularitet, dette ... -
Development of sustainable jute geotextiles by bitumen emulsion and polyester resin: Effect of gamma radiation
Akhtar, Nasrin; Das, Subrata Chandra; Grammatikos, Sotirios; Saha, Joykrisna; Khan, Mubarak Ahmad (Peer reviewed; Journal article, 2020)Jute fibers can be an alternative solution to replace synthetic fibers for temporary sustainable geotextiles applications. To produce sustainable geotextiles, jute fabrics were treated first by bitumen emulsion (BE) and ... -
Effect of accelerated weathering on the performance of natural fibre reinforced recyclable polymer composites and comparison with conventional composites
Das, Subrata C.; La Rosa, Angela Daniela; Stergios, Goutianos; Grammatikos, Sotirios (Peer reviewed; Journal article, 2023)This work investigated the long-term performance of unidirectional (UD) flax fibre reinforced recyclable polymer composites (FFRPs), after accelerated weathering for a total of 56 days, in laboratory environment. The ... -
Effects of accelerated aging on the appearance and mechanical performance of materials jetting products
Payami Golhin, Ali; Srivastava, Chaman; Strandlie, Are; Sole, Aditya Suneel; Grammatikos, Sotirios (Peer reviewed; Journal article, 2023)As a result of the associated costs and environmental impacts, Material Jetting (MJT) plays a limited role in Additive Manufacturing (AM). Research on the durability and long-term performance of MJT objects by evaluating ... -
Electromagnetic shielding for buildings using hybrid polymer composites: a life cycle assessment study.
La Rosa, Angela Daniela; Grammatikos, Sotirios; Ciobanu, Romeo C.; Schreiner, Cristina M. (Peer reviewed; Journal article, 2020)In the present paper, we investigated a sandwich composite as a potential electromagnetic interference shielding wall panel for buildings. The panel was built using a ferrite-particle modified high density polyethylene in ... -
Enhanced mechanical, thermal and antimicrobial properties of additively manufactured polylactic acid with optimized nano silica content
Vidakis, Nectarios; Petousis, Markos; Velidakis, Emmanouil; Mountakis, Nikolaos; Tzounis, Lazaros; Libscher, Marco; Grammatikos, Sotirios (Journal article; Peer reviewed, 2021) -
Fordeler ved additiv produksjon av kontinuerlig fiberforsterkede polymerkompositter i forsvar- og luftfartssektoren
Christensen, Bendik; Strengen, Karl Ole Baastad (Bachelor thesis, 2022)Oppgaven handler om bruk av sammenhengende fiber i additivproduksjon. Undersøkelsene skal se på hvilke styrker og svakheter additiv produksjon med kontinuerlig fiber har. Oppgaven ser spesifikt på en drone. -
Functional and Optical Properties of Structured Surfaces in Additive Manufacturing: Technologies for appearance evaluation in the quality assurance of 3D-printed polymers
Golhin, Ali Payami (Doctoral theses at NTNU;2023:178, Doctoral thesis, 2023)Quality assurance of additively manufactured parts requires assessment of appearance and surface finish quality. Appearance investigation is a primary step to ensure that the manufactured parts meet the required structural, ... -
Fused deposition modeling-based additive manufacturing (3D printing): techniques for polymer material systems
Daminabo, Samuel C.; Goel, Saurav; Grammatikos, Sotirios; Nezhad, Hamed Yazdani; Thakur, Vijay Kumar (Peer reviewed; Journal article, 2020)While the developments of additive manufacturing (AM) techniques have been remarkable thus far, they are still significantly limited by the range of printable, functional material systems that meet the requirements of a ... -
Fused Filament Fabrication 3D printed polypropylene/ alumina nanocomposites: Effect of filler loading on the mechanical reinforcement
Vidakis, Nectarios; Petousis, Markos; Velidakis, Emanuel; Mountakis, Nikolaos; Fischer-Griffiths, Peder Erik; Grammatikos, Sotirios; Tzounis, Lazaros (Peer reviewed; Journal article, 2022)Three-dimensional (3D) printed Polypropylene (PP) reinforced with aluminum oxide (Al2O3) nanoparticles (NPs) were developed and fully characterized in this study. Nanocomposite filaments were produced initially following ...