International Research Journal of Materials Sciences and Applications


Role of Dispersion and Functionalization on Mechanical Properties in Carbon Nanotube-Polymer Composites

Research Article of International Research Journal of Materials Sciences and Applications Role of Dispersion and Functionalization on Mechanical Properties in Carbon Nanotube-Polymer Composites Sai Praveen Kumar Medisetti1 and Dr. Nicholas Roberts1 1 Department of Mechanical and Aerospace Engineering, Utah State University, Logan, Utah 84322, USA Carbon nanotubes (CNTs) exhibit excellent mechanical and thermal properties. Designing composites that employ CNTs as the reinforcing or filler material offer the potential to create bulk materials with greatly enhanced mechanical and thermal properties. Unfortunately, the resulting property enhancement in CNT, and other carbon nanomaterial, enhanced composites vary greatly. In macroscale composites, like carbon fiber/epoxy composites, the large interface area and relatively low surface area to volume ratio of the carbon fiber/epoxy results in excellent transfer of load or thermal energy across the interface, thus allowing the carbon fiber to enhance the mechanical or thermal properties of the composite. In nanocomposites, the high surface area to volume ratio between the reinforcing and matrix materials requires tightly coupled interactions at the interface. Additionally, due to the high surface area to volume ratio of the nanomaterial filler, there is added difficulty in ensuring the reinforcing materials are uniformly dispersed. These two major differences between macroscale and nanoscale composites results in the existing predictive models failing to predict the effective composite properties. To improve the understanding of the roles that interface bonding and the dispersion of the reinforcing material play on the effective properties, we present the results of a detailed experimental study. To study the role of the reinforcing material/matrix interface bonding, we fabricate CNT/polymer composites where the CNTs are functionalized with different functional groups. To study the role of the nanoparticle filler dispersion, we fabricate CNT polymer composites with different dispersing techniques. This work shows that CNT dispersion is critical for fabricating CNT composites with enhanced ...

Eutectic Carbides in Damascus steel Ledeburite Class (Wootz)

Research Article of International Research Journal of Materials Sciences and Applications Eutectic Carbides in Damascus steel Ledeburite Class (Wootz) D.A. Sukhanov1, L.B. Arkhangelsky2 1ASK-MSC Company, Moscow, 117246, Russia 2President Union Smiths, Moscow, 111033, Russia Considered the nature of the change of the morphology of excess carbides in Damascus steel (Wootz), depending on the degree of supercooling of the melt, heat treatment and plastic deformation. Discovered that some of blades Damascus steel has an unusual nature of origin of the excess cementite, which different from the redundant phases of secondary cementite, cementite of ledeburite and primary cementite in iron-carbon alloys. It is revealed that the morphological features of separate particles of cementite in Damascus steels lies in the abnormal size of excess carbides having the shape of irregular prisms. Considered three hypotheses for the formation of excess cementite in the form of faceted prismatic of excess carbides. The first hypothesis is based on thermal fission of cementite of a few isolated grains. The second hypothesis is based on the process of fragmentation cementite during deformation to the separate the pieces. The third hypothesis is based on the transformation of metastable cementite in the stable of angular eutectic carbide. It is shown that the angular carbides are formed within the original metastable colony ledeburite, so they are called "eutectic carbide". It is established that high-purity white cast iron is converted into of Damascus steel during isothermal soaking at the annealing. It was revealed that some of blades Damascus steel ledeburite class do not contain in its microstructure of crushed ledeburite. It is shown that the pattern of carbide heterogeneity of Damascus steel consists entirely of angular eutectic carbides. Believe that Damascus steel refers to non-heat-resistant steel of ledeburite class, which have similar structural characteristics with semi-heat-resistant die steel or heat-resistant high speed ...

Evaluation of commercial and fresh-picked Origanum vulgare after dehydration

Research Article of International Research Journal of Materials Sciences and Applications Evaluation of commercial and fresh-picked Origanum vulgare after dehydration Vanessa Cristina dos Santos Peixoto de Oliveira1, Maria Inês Bruno Tavares1, Eduardo Miguez Bastos da Silva1, Paulo Sérgio Rangel Cruz da Silva1, Tiago Venâncio2 1Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas Professora Eloisa Mano, Av Horácio Macedo 2030, Bloco J, Centro de Tecnologia, Ilha do Fundão, Rio de Janeiro, RJ, Brazil, CEP 21941-598 2Departamento de Química, Universidade Federal de São Carlos, São Carlos, SP, Brazil Origanum vulgare Lamiaceae is one of the most used condiments in many countries, and is used in the perfume industry and also in folk medicine. To evaluate the composition of this plant due to its heterogeneity, the main objective was analyze origanum in commercial form and fresh picked after treated at different temperatures, using mainly solid-state NMR techniques, as well as FTIR, XRD and TGA were applied, showing possible existence of larger molecules and structures with low molar mass due to difference of mobility presented by molecules. We observed the carbon-13 signals’ intensity and the signals detection or not varied according to kind of oregano studied as well as the thermal treatment temperature. The techniques are efficient in determining the compounds present in such heterogeneous material, although they are difficult to apply. The HR-MAS confirmed the existence of major compounds such as water, fixed oils, terpenes and polysaccharides. Keywords: Origanum vulgare L; polysaccharides; NMR; heterogeneity ...

Vinyl Ester/Glass Microballoon Syntactic Foams with Low Density

Research Article of International Research Journal of Materials Sciences and Applications Vinyl Ester/Glass Microballoon Syntactic Foams with Low Density Salleh1, 2, M.M. Islam*1, J.A. Epaarachchi1, Haibin Su3 1Centre for Future Materials, Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Queensland 4350, Australia 2Universiti Kuala Lumpur, Malaysian Institute of Marine Engineering Technology, 32200, Lumut, Perak, Malaysia 3Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798. In this study, the synthesis and characterization of vinyl ester/glass microballoon syntactic foams with different weight percentages are investigated. Both the tensile and compressive properties of the syntactic foams are characterized. Generally, the results show that the compressive strength and moduli of several syntactic foam compositions are comparable to those of pure vinyl ester as a matrix resin. Due to the lower density of syntactic foams, the specific compressive properties of SCFT-01 (2wt.%) are higher than all other specimens and closer to neat resin. Similar trends are also observed in the tensile properties. The results show that syntactic foams with vinyl ester matrix possess strength behaviour that varies with different content of glass microballoons. This difference is related to the possibility of particle fracture in the stress range where modulus is calculated from the compressive stress–strain curves. In addition, tensile modulus is found to be 70–80% higher than the compressive modulus for all syntactic foam compositions, but both of them are still lower than neat resin. The results also show that the content of glass microballoons in the syntactic foams should be controlled to obtain a good combination of compressive strength and tensile strength. The reasons are discussed in detail. Keywords: Syntactic foam, composite, glass microballoon, resin, wall thickness ...

Prof.dr.ir. Gustaaf Schoukens
Professor, Ghent University (Belgium), faculty of Engineering

Dr. Azeez Abdullah Barzinjy
PhD (Materials Science), Department of Physics, College of Education, Salahaddin University –Erbil

Dr. Sujith Kalluri
Research Scientist, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, South Korea.

Dr. Nupur Saxena
CSIR-Senior Research Associate, Department of Physics and Astronomical Sciences, Central University of Jammu

Dr. Harish Mudila
Asst. Professor, Dept. of Chemistry, Faculty of Technology and Sciences, Lovely Professional University

Dr. Anil Kumar
Assistant Professor, Department of Chemistry, Lovely Professional University

Dr. Praveen Kumar Sharma
Associate Professor, Department of Chemistry, Lovely Professional University

Dr. HASAN DİLBAS
Yildiz Technical University Civil Engineering Faculty Civil Engineering

Dr. Rasha Samir Mohamed Kamal
Professor researcher associated, Egyptian Petroleum Research Institute

Dr. Mohammad Hadi Dehghani
Professor, Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

Dr. Jesús Ma. Rincón
Professor, “Colaborador Honorífico”- UMH (Dept. Agroquímicaía y Medio Ambiente)

Dr. Walid Mohamed Rashad Daoush
Professor, Material Science and Technology , Production Technology Department Head, Faculty of Industrial Education, Helwan University

Dr. Soumya Mukherjee
Assistant Professor, Amity School of Engineering and Technology, Amity University

Dr. Klodian Dhoska
Lecturer at Engineering School, Canadian Institute of Technology, Zayed Center, Rr. Andon Zako Çajupi,Tirana, Albania

Dr. Himanshu Kapoor
Assistant Professor, Department of Chemistry, Lovely Professional University

Dr. Keyur D. Bhatt
Head, Department of Chemistry, Mehsana Urban Institute of Science, Ganpat University

Dr. PREETA DATTA
Senior Engineer, Core Innovation, Sealed Air Corporation, USA.

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1. Avinaba Mukherjee, Sourav Sikdar, Anisur Rahman Khuda-Bukhsh. Evaluation of ameliorative potential of isolated flavonol fractions from Thuja occidentalis in lung cancer cells and in Benzo(a) pyrene induced lung toxicity in mice. International Journal of Traditional and Complementary Medicine, 2016; 1(1): 0001-0013. 
2. Vikas Gupta, Parveen Bansal, Junaid Niazi, Kamlesh Kohli, Pankaj Ghaiye. Anti-anxiety Activity of Citrus paradisi var. duncan Extracts in Swiss Albino Mice-A Preclinical Study. Journal of Herbal Medicine Research, 2016; 1(1): 0001-0006.

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International Research Journal of Materials Sciences and Applications (ISSN:2575-1034;doi:10.28933/irjmsa) is a peer reviewed open access journal publishing research manuscripts, review articles, editorials, letters to the editor in Materials Sciences and Applications.

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