Dr. Stefanos Nitodas
Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794, USA
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Academic Career Length
29Years (1998-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
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Journal Article
This review summarizes the recent advancements in the mechanical properties of nanocomposites reinforced with surface-modified carbon nanotubes (CNTs). A range of matrices, namely, polymers, metals, and cement, is investigated, which have demonstrated increasing importance in a broad range of industrial sectors, such as 3D printing, automotive, construction, and coatings. The strengthening mechanisms that CNTs impart in composites are reviewed, and synergistic effects with their surface groups or co-additives are analyzed, including wettability, mechanical interlocking, and chemical bonding. Different mechanical and functional properties of the CNT-reinforced nanocomposites are analyzed, such as tensile strength, flexural strength, impact resistance, thermal conductivity, and electrical conductivity. The improvements in these properties for a variety of CNT-based composites are presented, and details on how these improvements were attained are discussed. The review concludes that surface modification of CNTs has proven to be of high importance, enhancing compatibility with various matrices and facilitating improvements in the nanocomposite properties. Suggestions for viable CNT-based composites for use in the studied applications are also provided.
Journal Article
Nanomaterials have been commonly employed to enhance the performance of polymeric membrane materials that are used in several industrial applications. Carbon nanotubes (CNTs) have gained notable attention over the years for use in membrane technology due to their anti-biofouling properties, salt rejection capability, exceptional electrical conductivity, and mechanical properties. This paper aims to discuss some of the recent applications of CNTs in membrane technology and their effect on a larger scale. The paper reviews successful case studies of incorporation of CNTs in membranes and their impact on water purification, desalination, gas separations, and energy storage, in an effort to provide a better understanding of their capabilities. Regarding the future trends of this technology, this review emphasizes improving the large-scale production processes and addressing environmental and health-related hazards of CNTs during production and usage.
Journal Article
Stefanos NitodasMSMeredith Skehan
Meredith SkehanHLHenry Liu
Henry Liu
Raj ShahLarge-scale applications of nanotechnology have been extensively studied within the last decade. By exploiting certain advantageous properties of nanomaterials, multifunctional products can be manufactured that can contribute to the improvement of everyday life. In recent years, one such material has been nanocellulose. Nanocellulose (NC) is a naturally occurring nanomaterial and a high-performance additive extracted from plant fibers. This sustainable material is characterized by a unique combination of exceptional properties, including high tensile strength, biocompatibility, and electrical conductivity. In recent studies, these unique properties of nanocellulose have been analyzed and applied to processes related to membrane technology. This article provides a review of recent synthesis methods and characterization of nanocellulose-based membranes, followed by a study of their applications on a larger scale. The article reviews successful case studies of the incorporation of nanocellulose in different types of membrane materials, as well as their utilization in water purification, desalination, gas separations/gas barriers, and antimicrobial applications, in an effort to provide an enhanced comprehension of their capabilities in commercial products.
Journal Article
Andreas SapalidisPKPanagiotis I. Karantzis
Panagiotis I. KarantzisAVAchilles Vairis
Achilles VairisStefanos Nitodas
Stéphan Barbe
Evangelos FavvasPolyimides rank among the most heat-resistant polymers and find application in a variety of fields, including transportation, electronics, and membrane technology. The aim of this work is to study the structural, thermal, mechanical, and gas permeation properties of polyimide based nanocomposite membranes in flat sheet configuration. For this purpose, numerous advanced techniques such as atomic force microscopy (AFM), SEM, TEM, TGA, FT-IR, tensile strength, elongation test, and gas permeability measurements were carried out. In particular, BTDA–TDI/MDI (Ρ84) co-polyimide was used as the matrix of the studied membranes, whereas multi-wall carbon nanotubes were employed as filler material at concentrations of up to 5 wt.% All studied films were prepared by the dry-cast process resulting in non-porous films of about 30–50 μm of thickness. An optimum filler concentration of 2 wt.% was estimated. At this concentration, both thermal and mechanical properties of the prepared membranes were improved, and the highest gas permeability values were also obtained. Finally, gas permeability experiments were carried out at 25, 50, and 100 °C with seven different pure gases. The results revealed that the uniform carbon nanotubes dispersion lead to enhanced gas permeation properties.
29 October 2022 in Journal of Materials Research and Technology
Journal Article
YLYu-Chung Lin
Yu-Chung LinARAniket Raut
Aniket RautYFYiwei Fang
Yiwei Fang
YYYifan Yin
Yifan Yin
DSDavid Sprouster
David SprousterMRMiriam Rafailovich
Miriam Rafailovich
+6
12 October 2022 in Royal Society Open Science
Journal Article
QYQingcheng Yu
Qingcheng Yu
MFMaya Florentino
Maya Florentino
EAEmily Abplanalp
Emily Abplanalp
YLYingyi Liang
Yingyi Liang
SKSally Kremer
Sally Kremer
TAEJIN KIM +6
To investigate reaction order and kinetic parameters of the reaction between crystal violet (CV) and sodium hydroxide (NaOH), various concentrations of the reactants were applied. The present work also verifies the unknown solid product produced under highly concentrated conditions. The reaction orders of CV and NaOH were determined to be 1 and 1.08 by pseudo rate method, respectively, with a rate constant, k , of 0.054 [(M −1.08 ) s −1 ]. In addition to pseudo rate method, the half-life approach was used to calculate the overall reaction order to verify the accuracy of pseudo rate method. The overall reaction order was determined to be 1.9 by the half-life method. The overall reaction order based on the two methods studied was approximately 2. The precipitate formation was observed when high concentrations of CV (0.01–0.1 M) and NaOH (1.0 M) were applied. Fourier transform infrared (FTIR) spectroscopy was used to compare the spectra of the precipitate generated and a commercial solvent violet 9 (SV9). Based on the FTIR spectra, it was confirmed that the molecular structure of the precipitate matched that of solvent violet 9.
About Me
Dr. Stefanos (Steve) Nitodas is a chemical engineer by training and the holder of a Ph.D. degree in Materials Science and Chemical Engineering from the University of Rochester, New York. He has been a member of the Faculty of the Department of Materials Science and Chemical Engineering at Stony Brook University, NY, since 2018. He teaches core chemical engineering courses, including process control, reaction engineering and separation processes (e.g., membrane cascades). Prior to that, he worked for several years in the industry as R&D Director and also as Industrial Business Development Manager, starting in the microelectronics sector and then continuing in the nanotechnology industry for 12 years. His expertise lies in reaction engineering and advanced nanomaterial development through catalytic processes such as chemical vapor deposition and fluidized bed technology, as well as in the synthesis and applications of nanostructured carbon and polymer nanocomposites. Dr. Nitodas possesses significant know-how related to the transfer of knowledge from academia to industry and the setting up of start-up high-tech companies. He has served as Coordinator/Principal Investigator in EU-funded research projects with a total budget of USD 4.7 million, and he has been involved as Co-Principal Scientist in thirteen other funded research projects.