Browsing by Author "Mohapatra, A."

Now showing 1 - 5 of 5

Compressive Characterization of Date Palm Leaf Fiber
(Taylor and Francis Ltd., 2022) Nanda, J.; Das, S.N.; Mohapatra, A.
In this present work, the surface of date palm leaf fiber has been modified by means of different chemical treatments. The thermal, morphological, mechanical, and water absorption characteristics of DPL fibers were investigated. The effect of the surface modifications of the DPL fibers was envisioned through the SEM micrographs, which shows the existence of voids and rough surfaces because of the elimination of lignin, wax, and pectin from the fiber. FTIR spectroscopy of DPL fibers was done, to check the effects of surface modifications on the fiber composition. XRD analysis confirms the improvement in crystallinity index of the surface-modified DPL fibers. The thermogravimetric analysis confirms augmentation in the thermal stability and tensile strength of the surface-modified fibers. The water absorptivity test conforms the reduction in the water absorption of the DPL fiber after surface modification. Furthermore, the DSC curve shows the temperature range for the moisture vaporization from fibers, fiber degradation, and the formation of char.key words-Natural fiber,Composite,Date palm leaf fiber,XRD,SEM,FTIR. © 2021 Taylor & Francis.
Development of electrospun scaffolds for bone regeneration from strontium-doped hydroxyapatite nanorods and thermoplastic polyurethane elastomer
(Elsevier Ltd, 2025) Murugesan, S.; Patil, H.G.; Deshmukh, B.K.; N, S.; Asokan, A.; Mohapatra, A.; Lenka, N.; Anandhan, S.
Strontium based biomaterials have gained importance in bone tissue regeneration due to their incredible osteoinductivity and differentiation ability. In this study, strontium-doped hydroxyapatite nanorods [SrHAp, Ca9Sr(PO4)6(OH)2] were synthesized by the coprecipitation method. Subsequently, electrospun fibrous scaffolds were fabricated from thermoplastic polyurethane elastomer (TPU) dispersed with SrHAp nanorods. The loading of SrHAp nanorods in TPU was varied from 1 wt% to 7 wt% in steps of 2. Morphology of electrospun fibrous scaffolds and the dispersion of nanorods in the TPU matrix were characterised by field emission scanning electron microscopy, and elemental mapping by energy-dispersive x-ray spectroscopy, respectively. The scaffolds exhibited 3D interconnected network structure with well-distributed pores. The SrHAp nanorods were observed to be smoothly dispersed in the polymer matrix in the scaffolds using elemental mapping and transmission electron microscopy. The newly developed scaffolds exhibited adequate mechanical strength combined with good biocompatibility and excellent biomineralization characteristics. Further, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay of the electrospun scaffolds against gingiva-derived mesenchymal stem cells (gMSCs) revealed excellent survival and growth rate of the cells. In addition, the osteoinductivity study using gMSCs confirms the better osteodifferentiation in the scaffold containing 5 wt% SrHAp compared with its counterparts by showing the expressions of alkaline phosphatase (ALP), osteocalcin (OCN) and RUNX2. Among all the compositions, the one with 3 wt% SrHAp loading demonstrated promising results in terms of fiber uniformity, improved mechanical properties, and enhanced cell viability. Thus, the SrHAp/TPU scaffolds developed in this study have the potential for use in bone tissue regeneration. © 2025 Elsevier Ltd
Intrusion Detection System in Networks Employing a Double-Layer Architecture Using Machine Learning Algorithms
(Institute of Electrical and Electronics Engineers Inc., 2023) Mohapatra, A.; Jain, N.; Rudra, B.
Monitoring both the activities of the system itself and the traffic on the network is the job of an intrusion detection system, which is more commonly referred to by its acronym, IDS. The IDS works by analyzing the network traffic or system logs, looking for patterns and signatures of known threats, or deviations from normal behavior that may indicate an attack. This may be done in response to the activity or traffic being deemed suspicious or destructive. IDS can take many different shapes, but regardless of its appearance, their primary purpose is to identify potentially harmful traffic in a number of different ways. There are primarily two types of intrusion detection systems: those that monitor networks and those that monitor individual computers. The anti - virus program and the firewall are two examples of defensive mechanisms used by the systems that detects intrusion. IDS plays a major role in providing protection to systems and computer networks out of various types of attacks, such as malware infections, hacking attempts, and unauthorized access. It alerts security administrators to potential threats, provide detailed information about the attack, and help to prevent or mitigate the damage caused by the attack. Â© 2023 IEEE.
Solvothermally synthesized dopant-free anatase-titania nanostructures for efficient photocatalytic degradation of crystal violet under violet irradiation
(Elsevier Ltd, 2025) Mohapatra, A.; Murugesan, S.; Anandhan, S.
The anatase polymorph of titania is known for its photocatalytic behavior. In this study, titania nanoparticles synthesized through sol-assisted solvothermal process carried out in an autoclave were utilized as photocatalyst under violet radiation for the degradation of a model pollutant, namely crystal violet. The presence of titania in the anatase form was confirmed by x-ray diffraction. Electron microscopy revealed the coexistence of rod-like and spherical-shaped structures in the nano-titania. The average diameters were 9.8 nm and 12 nm for the spherical nanoparticles and the cylindrical ones, respectively. The band gap energy of titania as calculated from the uv–vis spectroscopy was 3.22 eV, which is in line with its theoretical value. The specific surface area of the nano-titania was 39.179 m2/g, and the total pore volume was 0.05 cc/g, which indicates the presence of large number of active sites on the surface of the photocatalyst for the adsorption of pollutant molecules. Excitation and emission spectra of titania were acquired using photoluminescence spectroscopy to ascertain the presence of surface defects. Subsequently the photocatalytic degradation of crystal violet using the anatase titania nanoparticles under violet light irradiation was studied. Under violet irradiation, the dopant-free anatase titania was able to efficiently photodegrade (at loading of 200 mg/L) 1L crystal violet solution of 20 ppm concentration within 90 minutes. The results indicate that this nano-titania could be used an alternate in the place of the systems reported hitherto in literature, which were either doped with heavy metal-based systems or blended with graphene. The result is a leap forward in sustainable water treatment. © 2025 Elsevier Ltd and Techna Group S.r.l. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Study on Physical and Mechanical Behavior of Bauhinia Vahlii Fiber Filled Glassâ€“Epoxy Hybrid Composites
(Springer Science and Business Media Deutschland GmbH, 2023) Ray, R.; Das, S.N.; Mohapatra, A.
Epoxy is well-suited for a number of industrial applications because of its versatility and its diversity. In many high-performance fields however, the overall use of epoxy limited its employment due to delamination, intrinsic fragility, low impact resistance and hardness to fractures. Epoxy's limitations can be overcome through inclusion and modification prior to industrial use. The present research describes the development of hybrid composites made of epoxy reinforced with glass fiber and filled with Bauhinia Vahlii fiber. Bauhinia Vahlii (BV) found to be most promising natural fiber for manufacturing composites for its superior mechanical as well as thermal properties. In this study, the incorporation of BV fiber on physical and mechanical behavior of glassâ€“epoxy composites was investigated. Various composite compositions with three distinct natural BV fiber percentages (4, 8, 12%) were fabricated using a hand layup technique. The results showed that increasing the percentage of natural fiber concentration improves mechanical qualities, however at larger BV fiber loading, the strength reduces due to presence of more voids which signifies poor bonding. Â© 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.