Tumkur University was established in 2004 in Tumkuru, Karnataka, India. It was carved out of Bangalore University to accommodate the needs of the students from Tumkuru district. Established under the Karnataka State Universities Act, 2000, as a multi-faculty university, it has 12 postgraduate departments, 2 constituent colleges and 94 affiliated colleges. It established 29 research centres to promote advanced multi-disciplinary research and academic collaborations. In 2012, the university was recognized under section 12(b) of the UGC Act, 1956. In the same year, the National Assessment and Accreditation Council (NAAC), an inter-university council of the UGC, accredited the University with "B" Grade in the three-grade rating scale.
A novel Schiff base derivative, (E)-N′-(2,6-dimethoxybenzylidene)-3-hydroxy-2-naphthohydrazide (F5), was synthesized and systematically investigated for its structural, electronic, and nonlinear optical (NLO) properties. The compound was characterized by FTIR and NMR spectroscopy, while single-crystal X-ray diffraction confirmed its orthorhombic Pbca crystal system stabilized by C–H···O and C–H···π interactions. Hirshfeld surface analysis revealed dominant H···H (44.5
In the growing landscape of intelligent diagnostic tools, the creation of multifunctional nanomaterials that serve both biomedical and forensic needs is redefining the capabilities of modern sensing systems. In this study, undoped and 1 mol% Sm3+ doped ZnAl2O4 (SZAO) nanoparticles (NPs) were prepared using a combustion synthesis strategy and incorporated into a carbon-paste electrode to fabricate a highly responsive electrochemical platform for dopamine (DA) detection. The resulting SZAO-modified electrode (SZAO-ME) produced a pronounced anodic peak current of 8.426 & micro;A far exceeding that of the unmodified electrode with optimal activity observed at physiological pH (7.0). Scan-rate analyses indicated that the electro-oxidation process follows diffusion-controlled kinetics, while differential pulse voltammetry (DPV) measurements demonstrated a clear linear dependence on dopamine concentrations in the 1-5 & micro;M range (R2 = 0.99). The system achieved a detection limit (LOD) of 0.238 & micro;M and a quantification limit (LOQ) of 0.797 & micro;M. The electrode further allowed dual detection of dopamine and uric acid (UA) with strong selectivity, yielding excellent linearity (R2 = 0.993 for DA and 0.996 for UA). Operationally, the SZAO-ME maintained more than 91% of its initial response after repeated testing cycles, evidencing notable stability. Its performance consistency was reinforced by low relative standard deviation (RSD) values 1.58% for repeatability and 1.55% for reproducibility. In addition to its electrochemical capabilities, the SZAO nanomaterial was applied for forensic studies, enabling clear visualization of latent fingerprints (LFPs). High ridge clarity, low background interference, and well-resolved minutiae across multiple surface types underscore its strong potential for advanced forensic fingerprint development.
The present study details the synthesis, structural characterization, and key physicochemical properties of 4-nitrobenzyl 4-(p-tolyl)thiazole-2-carboxylate (7). The thiazoles compound was synthesized via a Hantzsch-type cyclocondensation reaction and characterized using spectroscopic techniques, including 1H NMR and 13C NMR spectroscopy, along with single-crystal X-ray diffraction analysis. Single crystal X-ray diffraction study revealed that the compound 7 crystallizes in the triclinic crystal system with space group P '1 . The crystal structure reveals important insights into intermolecular interactions, like S···O, C–H···π and C = O···C = O interactions including hydrogen bonding, Van der Waals forces, and other intra and intermolecular forces that contribute to the overall molecular assembly. The solid-state structure analysis reveals a remarkable pattern of antiparallel C = O···C = O interactions. The influence of these non-covalent interactions was further validated using Hirshfeld surface analysis, providing a quantitative understanding of molecular packing contributions. The Density functional theory (DFT) simulations at the ωB97XD/6–311 + + G(d, p) level accurately predicted molecular geometry and matched experimental results. The NBO analysis further demonstrated that intramolecular charge transfer contributes to molecular stabilization, especially via hyperconjugative interactions.
A series of undoped and 1-9 mol% Eu3+ doped Ba2La4Zn2O10 phosphor are synthesized via solution combustion route utilizing Gaseteria brachyphylla (G. brachyphylla) gel as fuel. The optimized phosphor is explored for its potential in optical thermometry and latent fingerprints (LFPs) visualization applications. Under 394 nm excitation, Eu3+ doped Ba2La4Zn2O10 phosphors exhibited strong red emission associated with D-5(0)-> F-J transitions. The calculated Commission Internationale de l'& Eacute;clairage (CIE) coordinates (x = 0.6335, y = 0.3656) confirmed that the emitted light lies in the red spectral region, with an exceptional color purity (CP) of similar to 87.05 % with correlated color temperature (CCT) of 1876 K. Judd-Ofelt (J-O) parameters (Omega(2), Omega(4)) and other radiative properties are analyzed through photoluminescence (PL) emission spectra to gain insights into the luminescent behavior of Ba2La4Zn2O10:Eu3+ phosphors. The temperature-dependent emission study demonstrated that the luminescence intensity retained 88.57 % of its initial value at 420 K, with a high activation energy (E-a) of about 0.24 eV, highlighting the material's excellent thermal stability. The maximum relative sensitivity (S-r ) of the Ba2La4Zn2O10:5Eu(3+) phosphor is determined to be 2.46 % K-1 at 300 K. Furthermore, bright, clear red-emitting fingerprint images are developed using the powder-dusting method on multiple surfaces, including magazine paper, painted wood, and glass. These images exhibited excellent clarity, revealing well-defined Level I-III ridge features under 365 nm UV light. These results suggest that Ba2La4Zn2O10:5Eu(3+) phosphors hold strong potential for display technologies and LFPs visualization applications.
Background: The development of eco-friendly and efficient nanomaterials for environmental remediation and energy storage is crucial for sustainable technology. Vanadium pentoxide (V2O5) is a promising material due to its excellent optical, photocatalytic, and electrochemical properties. However, its performance can be further enhanced through strategic doping and green synthesis approaches. Methods: A bio-fueled solution combustion method was used to synthesize undoped and samarium-doped V2O5 (V2O5:Sm-3(+)) nanoparticles (NPs) utilizing Ocimum tenuiflorum leaf extract as a sustainable fuel. Structural, morphological, and optical properties were analyzed using XRD, FE-SEM, TEM, EDAX, XPS, and UV-Vis spectroscopy. Significant findings: XRD confirmed orthorhombic V2O5 with Sm-3(+) substitution. FE-SEM and TEM showed a transition from nanosheets to hierarchical flower-like structures at higher doping levels. The bandgap narrowed from 2.72 eV to 2.16 eV, enhancing visible-light absorption. V2O5:9Sm(3)(+) NPs exhibited 96.51 % photocatalytic degradation of Malachite Green within 100 min under sunlight and excellent recyclability. Phytotoxicity tests confirmed environmental safety, while electrochemical studies revealed superior supercapacitor performance with a high specific capacitance of 332.28 F/g and 93 % retention after 5000 cycles. The enhanced properties are attributed to Sm-3(+) induced structural and electronic modifications, demonstrating the potential of bio-synthesized V2O5:Sm-3(+) for sustainable applications.
