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Kim J.I.,Chonbuk National University | Pant H.R.,Chonbuk National University | Pant H.R.,Tribhuvan University | Pant H.R.,Research Institute for Next Generation | And 3 more authors.
Materials Science and Engineering C | Year: 2014

Tissue engineering requires functional polymeric membrane for adequate space for cell migration and attachment within the nanostructure. Therefore, biocompatible propolis loaded polyurethane (propolis/PU) nanofibers were successfully prepared using electrospinning of propolis/PU blend solution. Here, composite nanofibers were subjected to detailed analysis using electron microscopy, FT-IR spectroscopy, thermal gravimetric analysis (TGA), and mechanical properties and water contact angle measurement. FE-SEM images revealed that the composite nanofibers became point-bonded with increasing amounts of propolis in the blend due to its adhesive properties. Incorporation of small amount of propolis through PU matrix could improve the hydrophilicity and mechanical strength of the fibrous membrane. In order to assay the cytocompatibility and cell behavior on the composite scaffolds, fibroblast cells were seeded on the matrix. Results suggest that the incorporation of propolis into PU fibers could increase its cell compatibility. Moreover, composite nanofibers have effective antibacterial activity. Therefore, as-synthesized nanocomposite fibrous mat has great potentiality in wound dressing and skin tissue engineering. © 2014 Elsevier B.V. All rights reserved. Source


Pant H.R.,Chonbuk National University | Pant H.R.,Tribhuvan University | Pant H.R.,Research Institute for Next Generation | Pokharel P.,Hannam University | And 5 more authors.
Chemical Engineering Journal | Year: 2015

Cracking or delaminating with insufficient mechanical strength of biocompatible polymer layer applied for stent coating is a major limiting factor in stent coating technology. Novel strategies and smart materials are therefore required to develop stable polymeric layer on the surface of stent. In this study, an in situ polymerization technique is applied to fabricate graphene oxide (GO) loaded electrospun PU fibers. Viscous solution of in situ polymerized GO/PU composite in mixed solvent system of DMF/MEK (1:1 by wt) was applied to fabricate GO/PU composite fibers and its application on nonvascular stent coating was performed. Microscopic analysis shows that GO sheets are evenly distributed throughout the composite nanofibers. Spectroscopic analysis indicated the formation of chemically bonded GO-PU composite fibers. Mechanical performance evaluation and water contact angle measurement of pristine and composite PU electrospun membranes (obtained from the same method) showed that a 1. wt% GO containing PU fibrous mat is far better in mechanical properties and hydrophilicity compared to the pristine PU mat. The improved properties of composite PU fibers on the surface of nonvascular stent were evaluated using durability test. Results showed that as-synthesized composite PU fibrous membrane coated on the surface of stent has no crack or delaminate upon repeated cyclic stress during standard stent durability test. Therefore, the proposed coating material and processing technology will be a promising approach for the development of hybrid stent. © 2015 Elsevier B.V. Source


Kim H.J.,Chonbuk National University | Pant H.R.,Chonbuk National University | Pant H.R.,Tribhuvan University | Pant H.R.,Research Institute for Next Generation | Kim C.S.,Chonbuk National University
Digest Journal of Nanomaterials and Biostructures | Year: 2014

In this current study we have fabricated nonwoven filter membrane of polyacrylonitrile (PAN) that consists of antifouling and antibacterial capacity. Bleaching powder (BP) was incorporated through PAN fiber during electrospinning using blend solution of BP nanoparticles (NPs) and PAN. The morphology and composition of the composite BP/PAN fibers were observed by field scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and energy dispersive spectroscopy (EDS). The obtained results revealed that sufficient amount of BP NPs were effectively loaded on/into PAN fibers. The presence of BP on/into PAN fibers could significantly increase the hydrophilicity of PAN membrane which indicated that as-fabricated membrane can be used not only for bacterial destruction but also for introducing antifouling activity on the membrane. Significant increase in hydrophilicity of composite membrane compared to the pristine PAN membrane and excellent antibacterial activity of BP loaded PAN fibers indicated that this composite membrane will be a potential water filter media to provide pure drinking water. Source


Prasad Adhikari S.,Tribhuvan University | Prasad Adhikari S.,Chonbuk National University | Raj Pant H.,Tribhuvan University | Raj Pant H.,Research Institute for Next Generation | And 3 more authors.
Ceramics International | Year: 2015

A one pot hydrothermal process was used to grow zinc oxide (ZnO) flowers on the surface of graphitic carbon nitride (g-C3N4) for use as an efficient photocatalyst. ZnO flowers on g-C3N4 were grown by heat treating a solution of ZnO precursors with g-C3N4 particles at 140°C for 2h. The resulting composite photocatalyst was characterized by using field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and photoluminescence (PL) spectroscopy. The resulting composites exhibited sheet like g-C3N4 decorated with flower-like ZnO microparticles. The composite particle showed much better activity for the photocatalytic degredation of methylene blue than those of g-C3N4 or ZnO alone. This enhanced photocatalytic activity of the g-C3N4/ZnO composite is attributed to the synergistic effects between g-C3N4 and ZnO, which enhance the efficiency of charge separation and reduce the recombination probability of photogenerated electron-hole pairs. The photocatalytic activity of as-synthesized particles did not change after multiple cycles, indicating that the composite was stable and could be reused. © 2015 Elsevier Ltd and Techna Group S.r.l. Source


Prasad Adhikari S.,Chonbuk National University | Prasad Adhikari S.,Tribhuvan University | Raj Pant H.,Tribhuvan University | Raj Pant H.,Research Institute for Next Generation | And 3 more authors.
Ceramics International | Year: 2015

A one pot hydrothermal process was used to grow zinc oxide (ZnO) flowers on the surface of graphitic carbon nitride (g-C3N4) for use as an efficient photocatalyst. ZnO flowers on g-C3N4 were grown by heat treating a solution of ZnO precursors with g-C3N4 particles at 140 °C for 2 h. The resulting composite photocatalyst was characterized by using field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and photoluminescence (PL) spectroscopy. The resulting composites exhibited sheet like g-C3N4 decorated with flower-like ZnO microparticles. The composite particle showed much better activity for the photocatalytic degredation of methylene blue than those of g-C3N4 or ZnO alone. This enhanced photocatalytic activity of the g-C3N4/ZnO composite is attributed to the synergistic effects between g-C3N4 and ZnO, which enhance the efficiency of charge separation and reduce the recombination probability of photogenerated electron-hole pairs. The photocatalytic activity of as-synthesized particles did not change after multiple cycles, indicating that the composite was stable and could be reused. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Source

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