NOPR Collection:http://nopr.niscpr.res.in/handle/123456789/671602026-10-10T01:12:55Z2026-10-10T01:12:55ZDeep eutectic solvent-mediated synthesis of W-Mo oxide nanocomposites for enhanced and tunable photochromic responseAjayi, A. A.Oderinde, O.Ogunbayo, S. OAyoni, O.OOlawuyi, R. AAgbeja, A. O.http://nopr.niscpr.res.in/handle/123456789/671722026-01-22T09:23:50Z2026-01-01T00:00:00ZTitle: Deep eutectic solvent-mediated synthesis of W-Mo oxide nanocomposites for enhanced and tunable photochromic response
Authors: Ajayi, A. A.; Oderinde, O.; Ogunbayo, S. O; Ayoni, O.O; Olawuyi, R. A; Agbeja, A. O.
Abstract: This study details the synthesis and characterization of photochromic tungsten-molybdenum oxide (W-Mo)
nanocomposites using a deep eutectic solvent (Ethaline) composed of choline chloride and ethylene glycol in a 1:2 molar
ratio, providing a green and efficient fabrication route. FTIR analysis confirmed the successful incorporation of metal oxides
into the DES matrix, evidenced by characteristic metal-oxygen (W-O and Mo-O) stretching vibrations observed within the
947-767 cm-1 and functional group interactions. Scanning electron microscopy imaging revealed agglomerated, irregularly
shaped particles with porous morphologies, while energy dispersive X-ray spectroscopy confirmed the homogeneous
distribution of W and Mo within the composite. X-Ray diffraction patterns indicated a predominantly amorphous structure
with broad peaks corresponding to semicrystalline tungsten and molybdenum oxide phases. Ultraviolet-visible spectroscopy
showed strong absorption in the 259-476 nm range, confirming efficient light-induced activation. The nanocomposites
exhibited excellent photochromic performance, transitioning rapidly from cream-yellow to blue within three seconds under
UV exposure, and reversibly fading in an oxygen-rich environment within 50 min. Electrochemical impedance spectroscopy
(EIS) further revealed that the W-Mo (0.8:0.2) composite had the lowest charge transfer resistance, enhancing electron
transport and accelerating photo-switching behaviour. The combined structural, optical, and electrochemical properties of
these materials underscore their promise for use in smart windows, UV sensors, and dynamic display technologies.
Page(s): 11-192026-01-01T00:00:00ZPreparation and performance of waterborne intumescent coatings with mechanical, thermal properties and optimization of flame retardant paintsLakhawat, Gajanan P.Suke, Sanvidhan G.Fulkar, Arti B.Satpute, Ganesh D.Pawade, Vijay B.Modak, Jayant B.Deshmukh, Waheed A SalimBhuyar, Kiran D.http://nopr.niscpr.res.in/handle/123456789/671712026-01-22T09:21:03Z2026-01-01T00:00:00ZTitle: Preparation and performance of waterborne intumescent coatings with mechanical, thermal properties and optimization of flame retardant paints
Authors: Lakhawat, Gajanan P.; Suke, Sanvidhan G.; Fulkar, Arti B.; Satpute, Ganesh D.; Pawade, Vijay B.; Modak, Jayant B.; Deshmukh, Waheed A Salim; Bhuyar, Kiran D.
Abstract: Many industries typically like chemical industry, petrochemical and oil refineries etc. are prone to fire. In such a case
intumescent (IMT) paint will provide extra protection to substrate wherever it is applied. The aim of present work was to
optimize the fire protection performance and thermal properties of water-based IMT fire protective coatings on steel
structures through the use of flame-retardant paints. The IMT coating paint was prepared using water-based styrene acrylic
emulsion (SAE), flame-retardant additives (Ammonium phosphate, Pentaerythritol, Melamine and Dicyanadamide and
flame-retardant fillers (TiO2 and CaCO3). All these ingredients are mixed using mortal pestle. The coating paints with and
without fire retardant have been characterized by studying chemical properties by using FTIR, mechanical properties
(Flexibility test, Impact resistance test and Pull off test) and thermal properties (Bunsen burner test, furnace test, and
Thermogravimetric analysis test). The results demonstrated that mild steel specimens coated with IMT paint exhibited
effective fire protection performance; excellent adhesion strength, improved uniform char layer formation, and enhanced
thermal stability. It revealed that fire retardant coating had better or same properties than without fire retardant coating.
Hence, formulated IMT coating paint proved effective in protecting steel structures against fire.
Page(s): 20-282026-01-01T00:00:00ZInvestigation of feldspar flocculation characteristics using anionic, cationic and non-ionic flocculants in single and two-step flocculation systemsKaya, ÖzlemÖzkan, Ahmethttp://nopr.niscpr.res.in/handle/123456789/671702026-01-22T09:16:25Z2026-01-01T00:00:00ZTitle: Investigation of feldspar flocculation characteristics using anionic, cationic and non-ionic flocculants in single and two-step flocculation systems
Authors: Kaya, Özlem; Özkan, Ahmet
Abstract: This study investigates the flocculation behaviour of feldspar suspension using a variety of anionic, cationic, and non
ionic flocculants (A.336, A.338, A.1011, A.5250, A.110, A.120, A.1858, C.573, N.333 and N.351) in single and two-step
flocculation systems. Experiments have been performed at various dosages ranging from 0.2 to 12.5 mg/L. Flocculation
performance is evaluated based on turbidity, settling rate, and efficiency. Of the flocculants tested, non-ionic flocculant
N.351 demonstrated the most effective flocculation performance in terms of both turbidity reduction and flocculation
efficiency. N.351 achieved a flocculation efficiency of 98.5% at a dosage of 0.8 mg/L, achieving the lowest turbidity value
of 6.4 NTU (Nephelometric Turbidity Unit). Although N.351 demonstrated turbidity reduction and flocculation efficiency,
the highest settling rates are observed in the two-step system employing the cationic-anionic flocculation combinations of
C.573-A.338 and C.573-A.1011. These combinations achieved the highest settling rate of 2700 mm/min at dosages of
8.5 mg/L and 12.5 mg/L, respectively. This experimental study demonstrates that optimum flocculant dosages can vary
significantly depending on the type of flocculant, the combination used, and the performance parameters. These results
provide valuable information to optimize feldspar flocculation in industrial applications, which could improve process
efficiency and product quality in feldspar using industries.
Page(s): 29-362026-01-01T00:00:00ZPrediction of copper corrosion by machine learning and conventional methods in neem biodiesel with ecofriendly black pepper extractS, IyyappanP, Vinod Kumar KB, KarthikA, Nagarajan Vhttp://nopr.niscpr.res.in/handle/123456789/671692026-01-22T09:14:06Z2026-01-01T00:00:00ZTitle: Prediction of copper corrosion by machine learning and conventional methods in neem biodiesel with ecofriendly black pepper extract
Authors: S, Iyyappan; P, Vinod Kumar K; B, Karthik; A, Nagarajan V
Abstract: Copper is extensively utilized across many industries due to its outstanding attributes, nonetheless, undergoes corrosion
in biodiesel. In view of this menace, eco-friendly black pepper extract was investigated as a corrosion inhibitor for copper in
neem biodiesel. Weight loss measurement of copper in neem biodiesel was performed and the resulting values were utilized
to calculate inhibition efficiency, corrosion rate, and thermodynamic parameters. A quadratic regression machine learning
algorithm was employed to analyze copper corrosion at the operational temperature of the engine. Additionally, FTIR and
SEM analyses were performed to identify the functional groups of the inhibitor responsible for corrosion inhibition through
adsorption and to examine the surface morphology of the metal respectively. A corrosion inhibition efficiency of 98.0% for
copper in neem biodiesel was achieved at room temperature, and the inhibitor demonstrated significant effectiveness at the
operating temperature of engine nozzles. Carbonyl and amine groups of the inhibitor adsorbed on the metal formed a barrier
against biodiesel enabling corrosion protection. This value-added biodiesel presents a viable alternative fuel option that
protects engine components and storage tanks from corrosion.
Page(s): 37-472026-01-01T00:00:00Z