Soumen Jana
North Dakota State University
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Featured researches published by Soumen Jana.
Composite Interfaces | 2007
A. Zhamu; Soumen Jana; Amin Salehi-Khojin; E. Kolodka; Y. X. Gan; Wei Hong Zhong
Based on the development of a series of nanofiber/epoxy matrices with reactive graphitic nanofibers (r-GNFs) in our previous work, the flow behavior and cure process of the nanofiber/epoxy materials with 0.1, 0.3 and 1.3 wt% of r-GNFs were investigated by rheological method and differential scanning caloremetry (DSC) tests. Non-isothermal and isothermal viscosity curves (at 110, 115 and 120°C, respectively) were obtained. The gel time was obtained from the isothermal tests for the neat epoxy resin and the nanofiber/epoxy systems. Nanofiber/epoxy matrix has longer gel time. Arrhenius activation energies obtained from both DSC and rheological tests showed close values for the nanofiber/epoxy matrices with different contents of r-GNFs. These results on the flow and curing characteristics of the nanofiber/epoxy matrices indicated that the nanofiber/epoxy matrices have good processability for manufacturing fiber composites and are expected to improve the properties of the fiber composites. Both isothermal and non-isothermal viscosity models were applied to describe the rheological behaviors of the nanofiber/epoxy matrices. On the one hand, a four-parameter isothermal model was found to be valid in simulating the isothermal process; on the other hand, a five-parameter non-isothermal model was constructed and found suitable for describing the non-isothermal behavior of the nanofiber/epoxy matrices. The theoretical results from the chemorheological models were found to be in good agreement with the experimental data.
Journal of Adhesion | 2006
Soumen Jana; A. Zhamu; Wei-Hong Zhong; Yong Xue Gan
Ultrahigh-molecular-weight polyethylene (UHMWPE) fibers have poor wetting and adhesion properties to polymer resins because of the inert surface of the fibers. In our previous study, a reactive nano-epoxy matrix, developed by making a modification on the matrix with reactive graphitic nanofibers (r-GNFs), showed improved wettability to UHMWPE fibers. In this work, fiber bundle pullout tests were conducted to evaluate the adhesion property between the UHMWPE fibers and the nano-epoxy matrices. Analysis of load–displacement curves from pullout tests shows that debonding initiation load and ultimate debonding load increased considerably, because of effective improvement of adhesion between the UHMWPE fibers and nano-epoxy matrix. Stress-controlled and energy-controlled models of interfacial debonding were applied for theoretical analyses. Results from ultimate IFSS, frictional shear stress, and critical energy-release rate are in good agreement with experimental results. Nano-epoxy matrix with 0.3 wt% r-GNFs shows effective improvement in terms of adhesion property between UHMWPE fiber and epoxy.
ASME International Mechanical Engineering Congress and Exposition, IMECE 2007 | 2007
Xiaoxi Wang; Wei Li; Vipin Kumar; Soumen Jana; Katie W. H. Zhong
Polymer nanocomposites with carbon nano tubes (CNTs) added in the polymer matrices have been shown to have improved material properties comparing to their neat forms. Foaming of polymer nanocomposites is even more interesting because these foams promise higher strength-to-weigh ratio and multifunctionality. However, many foaming results on polymer nanocomposites are inconclusive, for example, the effect of nano-additives on the bubble nucleation. In this study, solid-state foaming of pure PMMA and PMMA/CNT composite were performed. CNTs were dispersed in PMMA solution with ultrasonication. Microcellular foams were achieved in both cases. The resulted relative density and microstructures were investigated. It was found that nano carbon tubes aggregated on the cell walls of the microcellular foams. In terms of the cell size and relative density, there is no significant difference between pure PMMA and PMMA/CNT foams. Better dispersion of CNTs is needed in order to further study the CNT effect on the solid-state foaming process.Copyright
Thermochimica Acta | 2007
Soumen Jana; Amin Salehi-Khojin; Wei Hong Zhong
Journal of Colloid and Interface Science | 2006
S. Neema; Amin Salehi-Khojin; A. Zhamu; Wei Hong Zhong; Soumen Jana; Y.X. Gan
Journal of Applied Polymer Science | 2007
Soumen Jana; Wei-Hong Zhong
Composites Part A-applied Science and Manufacturing | 2007
A. Zhamu; Michael Wingert; Soumen Jana; Wei-Hong Zhong; James J. Stone
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2007
Soumen Jana; Wei-Hong Zhong; Yong X. Gan
Journal of Nanoscience and Nanotechnology | 2007
Amin Salehi-Khojin; Soumen Jana; Wei Hong Zhong
Journal of Materials Science | 2007
Amin Salehi-Khojin; Soumen Jana; Wei Hong Katie Zhong