Priyaranjan Mohapatra - Academia.edu (original) (raw)

Papers by Priyaranjan Mohapatra

Journal of applied polymer science, Apr 23, 2024

Journal of molecular and engineering materials, Mar 7, 2024

Journal of Fluorescence, Dec 17, 2023

Polymer-plastics technology and materials, Jul 19, 2022

CRC Press eBooks, Nov 14, 2022

Journal of Applied Polymer Science, Jul 30, 2019

ABSTRACTIn present work, Dextran‐grafted poly(acrylic acid) [D‐g‐PAA] hybrid nanocomposites are p... more ABSTRACTIn present work, Dextran‐grafted poly(acrylic acid) [D‐g‐PAA] hybrid nanocomposites are prepared in aqueous medium with reinforcement of various concentrations of nano‐CaCO3 (CC) through in situ polymerization of acrylic acid. The chemical interactions between filler and polymeric matrix are studied by Fourier transform infrared spectroscopy. The structural properties of the D‐g‐PAA/CC nanocomposite are investigated by X‐ray diffraction, field‐emission scanning electron microscopy, and high‐resolution transmission electron microscopy. The aloe vera plant structured morphology is noticed by interaction of dextran with PAA, where CC nanoparticles are embedded within the D‐g‐PAA matrix. The thermal stability of the D‐g‐PAA/CC hybrid nanocomposites is enhanced by the incorporation of nano‐CC. The tensile properties and antibacterial behavior of D‐g‐PAA/CC hybrid nanocomposites are also increased by incorporation of nano‐CC. The oxygen barrier behavior of hybrid nanocomposites is increased by 11‐folds with a reinforcement of 8 wt % of nano‐CC. Herein, the incorporation of nano‐CC enhances the oxygen barrier, thermal, and antimicrobial properties of the D‐g‐PAA matrix by which the synthesized material is suitable for packaging applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48298.

Materials Today: Proceedings, 2022

Trends in Sciences

In recent years, many more chemists have been focused on fluorescent probe research, and signific... more In recent years, many more chemists have been focused on fluorescent probe research, and significant progresses, which has been made in terms of design and use. This review begins with a brief overview of the most prevalent chemosensor design concepts, followed by a discussion of the photophysical characteristics of the 1,8-naphthalimide structure, such as great photostability, high fluorescence quantum yield and ease of modification which has been used in Zn2+ cation sensing to date. The contributions of the fluorescent probes built on the 1,8-naphthalimide based platform in the field of chemical sensing, biological sensing, pharmaceutical chemistry, environment and food safety in the last 10 years are then systematically introduced by discussing the probe’s fluorescence behavior in the corresponding recognition process. Simultaneously, we intend to build an overall review on fluorescent chemical sensor that will be able to play larger and more interesting role in the future. HIGHL...

Materials Today: Proceedings

Bulletin of The Korean Chemical Society, May 20, 2012

InP quantum dot (QD)-organosilicon nanocomposites were synthesized and their photoluminescence qu... more InP quantum dot (QD)-organosilicon nanocomposites were synthesized and their photoluminescence quenching was mainly investigated because of their applicability to white LEDs (light emitting diodes). The as-synthesized InP QDs are capped with myristic acid (MA), which are incompatible with typical silicone encapsulants. We have introduced a new ligand, 3-aminopropyldimethylsilane (APDMS), which enables embedding the QDs into vinyl-functionalized silicones through direct chemical bonding. The exchange of ligand from MA to APDMS does not significantly affect the UV absorbance of the InP QDs, but quenches the PL to about 10% of its original value with the relative increase in surface related emission intensities, which is explained by stronger coordination of the APDMS ligands to the surface indium atoms. InP QD-organosilicon nanocomposites were synthesized by connecting the QDs using a short cross-linker such as 1,4-divinyltetramethylsilylethane (DVMSE) by the hydrosilylation reaction. The formation and changes in the optical properties of the InP QD-organosilicon nanocomposite were monitored by ultraviolet visible (UV-vis) absorbance and steady state photoluminescence (PL) spectroscopies. As the hydrosilylation reaction proceeds, the QD-organosilicon nanocomposite is formed and grows in size, causing an increase in the UV-vis absorbance due to the scattering effect. At the same time, the PL spectrum is red-shifted and, very interestingly, the PL is quenched gradually. Three PL quenching mechanisms are regarded as strong candidates for the PL quenching of the QD nanocomposites, namely the scattering effect, Förster resonance energy transfer (FRET) and cross-linker tension preventing the QD's surface relaxation.

Materials Today: Proceedings, 2021

Abstract Worries have arisen in the area of chemical processing due to huge quantities of inflamm... more Abstract Worries have arisen in the area of chemical processing due to huge quantities of inflammable and toxic solvents are used every day. Continuous use of solvents has a harmful effect on all living plants and animals, destroying most organs. In spite of the fact that organic solvents, like acetone, DMSO, DMF as well as aromatic compounds e.g. benzene, toluene and chlorinated solvents contribute to the environmental pollution, they are still used in large amounts. The most important intention of green chemistry is to decrease the use of solvents or substituting them with less toxic ones. Ionic liquids, water, supercritical fluids, non-toxic liquid polymers like PEG are part of the class of green solvents. They are classified by convenient accessibility, low toxicity and option of reuse. Among all, ionic liquids (ILs) are most popular among all scientists because of their versatile behavior like: high stability, biodegradability, low vapor pressure and low toxicity etc. Due to these properties ILs are the best replacement of traditional chemicals and reflected as green solvents. The present review article mainly emphasizes on different types of ILs and their role in environmental pollution control and also in medical applications.

Advanced structured materials, 2017

Starch is a popular natural biodegradable polymer which has created a special feature for rubber ... more Starch is a popular natural biodegradable polymer which has created a special feature for rubber nanocomposite due to their biodegradable, renewable and biocompatible nature. In this chapter, we focus the various techniques for preparation of rubber nanocomposite are compared. The characterization techniques of starch based rubber are discussed. He thermal, biodegradation rheology and mechanical properties of starch based rubber are explained from existing literature. This chapter may open a window to explore the idea of starch based bio-rubbers in various industrial applications.

The graphene is the two dimensional carbon sheets made from the ghiphite. The π-conjugation in gr... more The graphene is the two dimensional carbon sheets made from the ghiphite. The π-conjugation in graphene shows extraordinary thermal, mechanical and electrical properties. It is the materials of new generation in the scope of scientific, industrial interest. In present review, the basics of graphene are highlighted with reference to its advantages with respect to other carbon based materials. The preparation of graphene at different methods is summarized with their comparative advantages. The emerging properties of the graphene are narrated with other materials of comparative behavior. The possible applications of graphene and related materials are established with reference to their structural properties.

Asian Journal of Chemistry, Nov 16, 2019

The intermolecular free-length of 1-butyl-2,3-dimethylimidazolium chloride [bdmim]Cl in pure wate... more The intermolecular free-length of 1-butyl-2,3-dimethylimidazolium chloride [bdmim]Cl in pure water as well as in tetra-n-butyl ammonium bromide (TBAB) + water at different concentrations of solute and at T = (298.15 to 313.15) K have been evaluated by making use of ultrasonic and thermoacoustical parameters followed by a comparative study. To accomplish this objective, thermoacoustical parameters for the above said solutions have been calculated. These parameters have been used to determine intermolecular free-length (Lf) for the solutions under study. The values of Lf obtained by thermoacoustical approach were tallied with the values obtained by well-known ultrasonic method (Schaaffs method). To the best of our understanding, this study is an innovative attempt in the determination of intermolecular free-length present in the investigated solutions by making use of ultrasonic approach.

Polymer-plastics technology and materials, Feb 28, 2022

Journal of Physical Organic Chemistry, May 16, 2019

Herein, a low-cost and eco-friendly approach is adopted for the synthesis of L-cysteine-assisted ... more Herein, a low-cost and eco-friendly approach is adopted for the synthesis of L-cysteine-assisted silver/reduced graphene oxide (L-cys-rGO/Ag) nanocomposites using sodium citrate as reducing agent. The morphology of graphene oxide (GO) and L-cys-rGO/Ag nanocomposites are studied by scanning electron microscope (SEM). The strong interactions of rGO/Ag with L-cysteine are established by Fourier transferred infrared (FTIR) study. The average diameter of dispersed Ag NPs is 40 to 70 nm, which is evidenced by transmission electron microscope (TEM). In the preparation of L-cys-rGO/Ag nanocomposites, both GO and L-cysteine are used as supporting and stabilising media to avoid the unexpected agglomeration in the in situ formed Ag NPs and to get high surface area in the nanocomposites. The excellent behaviour of L-cys-rGO/Ag nanocomposites acting as a heterogeneous catalyst for the conversion of 4-nitrophenol to 4-aminophenol with NaBH 4 is achieved that is due to the high adsorption of reactant on the surface rGO and more transfers of electron from rGO to Ag NPs. Beside this, Lcys-rGO/Ag nanocatalyst can be reused several times with negligible loss of catalytic efficiency. Further, the as-synthesised nanocomposites show good antioxidant behaviour.

Inorganic Chemistry Communications, Aug 1, 2023