EXPLORATION OF CORROSION INHIBITION POTENTIAL OF NOVEL N, N′-BIS(2-HYDROXY-3,5-DINITROBENZYL)-1,4-PHENYLENEDIAMINE FOR MILD STEEL CORROSION IN 3M NACL SOLUTION P Karuppasamy, S Meena, C. Shanmuga Sundari, N Edayadulla, K Gayathri Rasayan Journal of Chemistry, 2026 This study explored the corrosion inhibition potential of a novel reduced Schiff base compound, such as N, N′- bis(2-hydroxy-3,5-dinitrobenzyl)-1,4-phenylenediamine (BNSPDA), on mild steel (MS) in a 3 MNaCl by weight loss, adsorption isotherm, FE-SEM, EDX, AFM, PDP, and EIS studies. Inhibition efficiency increases with risinginhibitor concentrations but decreases with temperature. Maximum inhibition efficacy reached 65.89 %. TheLangmuir adsorption model was found to be the best fit. Polarization data indicated mixed-type inhibition, whileEIS revealed a diffusion-controlled mechanism. The -∆H* and -∆S * values supported the exothermic process andconfirmed active adsorption. Additionally, -∆Gº value reinforced spontaneous adsorption. These findings pave theway for promising mechanisms and future applications in corrosion science.
Advancement of optical fibre in the medical field Chandraraj Shanmuga Sundari, Naushad Edayadulla Glass Based Materials Advances in Energy Environment and Health, 2024 Fibre optics are resistant to electromagnetic interference and can withstand extreme conditions, making them ideal for medical applications. They are safe and non-toxic, making them suitable for use in and around the human body. The flexibility and small size of fibre optics allow access to hard-to-reach areas of the body. Advances in optics are leading to the development of portable optical devices for remote data transfer. Single-use fibre-optic surgical catheters have been found to be more effective than reusable ones, improving medical procedures. Fibre-optic technology has greatly enhanced medical practices, from headlamps to robotic surgery systems.
Characterization of Calotropis gigantiea plant leaves biomass-based bioplasticizers for biofilm applications Shanmuga Sundari Chandraraj, Indran Suyambulingam, Naushad Edayadulla, Divya Divakaran, Manoj Kumar Singh, M.R. Sanjay, Suchart Siengchin Heliyon, 2024 leaf plasticizers (CLP) serve as viable alternatives to chemical plasticizers. First time, the natural plasticizers from the Calotropis leaves were extracted for this study using a suitable chemical approach that was also environmentally friendly. The XRD results showed a reduced crystallinity index of 20.2 % and a crystalline size of 5.3 nm, respectively. TGA study revealed that the CLP has good thermal stability (244 °C). Through FT-IR study, the existence of organic compounds in CLP can be investigated by key functional groups such as alcohol, amine, amide, hydrocarbon, alkene, aromatic, etc. Further the presence of alcoholic, amino, and carboxyl constituents was confirmed by UV investigation. SEM, EDAX analysis, and AFM are used to examine the surface morphology of the isolated plasticizer. SEM pictures reveal rough surfaces on the CLP surface pores, which makes them suitable for plasticizing new bioplastics with improved mechanical properties. Poly (butylene adipate-co-terephthalate) (PBAT), a biodegradable polymer matrix, was used to investigate the plasticization impact after the macromolecules were characterised. The biofilm PBAT/CLP had a thickness of 0.8 mm. In addition, the reinforcement interface was examined using scanning electron microscopy. When CLP is loaded differently in PBAT, the tensile strength and young modulus change from 15.30 to 24.60 MPa and from 137 to 168 MPa, respectively. CLP-reinforced films demonstrated better surface compatibility and enhanced flexibility at a loading of 2 % when compared to pure PBAT films. Considering several documented characteristics, CLP may prove to be an excellent plasticizer for resolving environmental issues in the future.
Role of Stabilizing Agent Role in Nanomaterials (NM) Naushad Edayadulla, Chandraraj Shanmuga Sundari Sustainable Green Synthesised Nano Dimensional Materials for Energy and Environmental Applications, 2024 The incredible applications of nanotechnology in several fields include medicine, cleaning up environmental contamination, information and communication technologies, catalysis, detection, and the production of stronger and lighter materials. Creating and altering materials at the nanoscale requires scaling from a single atom to a collection of them. The necessary nanostructures have been created using a variety of techniques, including physical, chemical, and biological (ecofriendly approaches) (Bayda et al. 2020). Nanomaterials (NMs) have astonishing properties contrary to bulk metals, which frequently exhibit reduced energy state densities, a high surface-to-volume relationship, and sizes in the nanoscale choice; NMs offer an incredible variety of features. Size, shape, and surface morphology have an important impact on these nanoscopic materials’ physical, chemical, optical, and electrical properties. In order to prepare nanoparticles, metal ions are typically reduced in solutions or high-temperature gaseous environments. Because of these particles’ high surface energies and reactivity, most systems develop aggregation without any passivation or surface protection. However, the acquisition of NMs with the necessary properties and chemicals binds to particle surfaces in a way that the predictable features are preserved or enhanced when needed. Furthermore, in order to create innovative, advanced nanostructures, it is necessary to fully comprehend the role played by each chemical during the growth process. For the synthesis of nanomaterials, there are two methodologies: one is a bottom-up approach, and the other is a top-down approach. The synthesis of nanoparticles is done using a top-down technique, where size reduction is employed as an appropriate initiating material (Jeevanandam et al. 2018). The surface structure of the nanoparticles is imperfect due to the top-down technique, which is a serious constraint because the surface structure considerably impacts the chemistry and other physical characteristics of nanoparticles (Ramanathan et al. 2021). Smaller entities are brought together to create the nanoparticles in a process known as bottom-up synthesis. In this approach, first, smaller entities are formed; after that, these entities are assembled to produce the final particles, and particle sizes are in the nanometer range (Barhoum et al. 2022). These synthesis methods start with the nucleation and development of the NMs, then the metal precursor is chemically reduced, usually in solution. To initiate the transition, one must choose a reducing agent.
Synthesis and antibacterial evaluation of tetrahydropyrimidine-5-carboxamide N. Edayadulla, S. Anand, T. Shankar Asian Journal of Chemistry, 2018 A series of new dihydropyrimidine-2 H- ones/thiones were synthesized and evaluated in vitro for their antibacterial activity. Characterization of newly synthesized dihydropyrimidones was done by physical and spectral data. All the synthesized compounds were evaluated for their antibacterial activity. Amongst all, compounds 3e and 4e registered high activity against the bacterial strain when compared to standard drug.