Ganesan Suganya Priyadharshini

This study investigated the development and characterization of 3D‐printed poly (lactic acid) (PLA)/ethylene‐vinyl acetate (EVA) biocomposites reinforced with Blepharis maderaspatensis nanocellulose. Nanocellulose was extracted from B. maderaspatensis leaves and incorporated into PLA/EVA blends at 1, 3, and 5 wt% loadings. The biocomposites were extruded into filaments and 3D‐printed using fused deposition modeling (FDM). FTIR analysis confirmed the successful incorporation of nanocellulose and the presence of hydrogen bonding interactions between the filler and matrix. Mechanical testing revealed that the 1 and 5 wt% filler loadings enhanced the tensile strength (28.5 and 27.9 MPa, respectively) and impact resistance (12.1 and 14.3 kJ/mm ² , respectively), while 3 wt.% loading maximized the flexural strength (74.2 MPa) and compressive strength (31.6 MPa). The Shore D hardness remained stable (72–74) across all formulations. TGA indicated high thermal stability with onset degradation temperatures of approximately 305°C–310°C and maximum degradation rates of 392°C–395°C. SEM and EDS confirmed uniform filler dispersion at 1 wt% and largely uniform dispersion at 5 wt%, though localized agglomerated regions were also present, explaining the balance of improved mechanical toughness but hindered crystallization. These findings demonstrate that B. maderaspatensis nanocellulose is a sustainable reinforcement for PLA/EVA composites, enabling tunable mechanical and thermal properties for biomedical three‐dimensional (3D) printing applications.

In the current investigation, Mo₂C nanoparticles which have been subjected to modification with stearic acid were successfully produced through utilization of a magnetic stirrer, followed by a subsequent phase of vacuum drying lasting for 12 h. The incorporation of three distinct weight percentage concentrations (0.1%, 0.3%, and 0.5%) of nanoparticles into base lubricating oil SAE15W40 was carried out to synthesize nano lubricants. A comprehensive analysis of the physical and chemical attributes of the newly synthesized nano-lubricants was conducted, encompassing examinations of parameters such as acidity levels, calorific content, flash and fire points, viscosity characteristics, and thermal stability properties. Furthermore, an assessment of the tribological behavior of the synthesized nano lubricants was performed under varying loads utilizing a pin on disk tribometer apparatus. The nano lubricant containing 0.3 weight percent of Mo₂C exhibited notably enhanced performance in comparison to the base lubricating oil.

The enhancement of the properties of fiber-based polymer composites is generally possible by the hybridization of fibers. Using synthetic and natural fibers in the composites will enhance the applications, and the problem of voids is solved by using fillers. Mixing banana fiber with glass fibers creates a lightweight yet robust material for architectural elements such as panels and insulation. The current investigation encompassed the production of a glass/banana hybrid composite by integrating a Zirconium carbide (ZrC) filler via compression molding methodologies. The filler proportion varied at five levels: 0 wt%, 0.5 wt%, 1 wt%, 1.5 wt% and 2 wt%, within an epoxy resin matrix. The composite materials underwent mechanical, water absorption, and vibration analysis. Furthermore, the fractured surface was examined using a field emission scanning electron microscope (FESEM) better to understand the interactions between the fibers and the matrix. The initial findings indicated that the incorporation of Banana and glass fibers in composite materials has the potential to achieve an optimal balance between strength and versatility. The key findings include a considerable increase in tensile, flexural, and impact strengths with 1.5 wt% ZrC filler, with improvements of up to 34.5% in impact strength and 44.7% in compressive strength over the unfilled composite.

The requirement for lightweight materials that can survive increasingly severe conditions for aerospace components has fueled the research on magnesium alloys. The current work investigates the influence of hot rolling on the creep characteristics of the Mg-5Ag alloy that is fabricated through a selective laser melting process. The creep properties of parent material (PM) and hot-rolled specimens (HRA) are determined by indentation creep tests at 250 °C, 275 °C, and 300 °C. The microstructural evolution, phase transformation kinetics, and texture evolution were deduced using instrumental analysis, including SEM, EBSD, TEM, and XRD. The specimen PM features α-Mg grains with intermetallic Mg-Ag particles along grain boundaries and random grain orientations with low-angle boundaries. However, specimen HRA has a more fraction of Mg-Ag precipitates, a dominant (0001) grain orientation, and higher peak intensity from the (002) plane. The HRA specimen also demonstrates higher apparent activation energies, attributed to microstructural changes from hot rolling. The results show that the creep resistance of the hot rolled Mg-5Ag alloy is superior to as-fabricated Mg-5Ag alloy based on the creep velocity, stress exponent, and apparent activation energy.

The growing demand for sustainable materials is driving the adoption of microcrystalline cellulose (MCC) from renewable plant sources. This study investigated the isolation of MCC from Rosa indica petal (RIP) waste via acid hydrolysis. RIP was pretreated with alkali extraction and bleaching prior to acid hydrolysis. Chemical analysis revealed the composition of pretreated RIP was 79.56 wt.% cellulose, 9.87 wt.% hemicelluloses, and 5.69 wt.% lignin. Fourier‐transform infrared spectroscopy (FTIR) showed reduced peaks at 3332.88, 2851.95, and 1577.75 cm⁻¹ after alkali treatment, indicating removal of hemicelluloses and lignin. X‐ray diffraction (XRD) found the crystallinity index of the isolated Rose indica petals cellulose (RIPC) MCC was 72.31%, suggesting effective purification. Thermogravimetric analysis (TGA) revealed RIPC MCC had a decomposition temperature of 296.65°C, superior to raw RIP at 211.25°C. In addition, atomic force microscopy (AFM) and scanning electron microscopy (SEM) showed RIPC MCC had fibrous morphology with fiber diameters ranging from 16.2–22.4 nm. In summary, RIPC MCC with high purity, crystallinity and thermal stability was successfully isolated from RIP waste via acid hydrolysis. The high performance of RIPC MCC demonstrates the potential of RIP leftovers as a renewable source for MCC production. RIPC MCC could serve as a promising reinforcement filler in nanocomposites due to its advantageous properties.