Enhanced oil-water separation by affordable and eco-friendly candle soot-wax coated sponges Mehejbin R Mujawar, Dhanaji B Malavekar, Prashant D Sanadi, Deepak A Kumbhar, Rajesh B Sawant, Jin Hyeok Kim, Ankush M Sargar, Shivaji R Kulal Engineering Research Express, 2025 Economic and eco-friendly superhydrophobic sponges were readily fabricated by coating a Candle Soot-Wax composite for efficient oil–water separation. For this, the candle soot was extracted from the combustion of a paraffin candle and deposited onto sponges using wax through a dip-coating process. This leads to the adhesion of candle soot and produces competent superhydrophobic sponges. It exhibits a water contact angle of >150° that informs remarkable surface superhydrophobicity. Also, its superiority was tested with several parameters, including thermal stability, pH tolerance, compression tolerance, chemical durability, reusability, etc, that offer satisfactory results besides validating its superhydrophobic nature. Furthermore, its superhydrophobic tolerance was tested for anti-wetting properties, cross-sectional cutting, pressing, paper peel test, and abrasion resistance. Therefore, it proved that this simple candle soot-wax coating technology has practical capabilities for coating large surfaces. This promising material can work as a distinct and economical oil–water separator, which will help to prevent massive environmental pollution caused by oil spills in water.
Development of a cost-effective candle soot-polymer composite mesh for efficient oil-water separation Mehejbin R Mujawar, Dhanaji B Malavekar, Prashant D Sanadi, Deepak A Kumbhar, Jin Hyeok Kim, Ankush M Sargar, Shivaji R Kulal Physica Scripta, 2025 Due to the increasing demand for separating oil and water from contaminated water, developing novel superhydrophobic surfaces for these separations is essential. Therefore, it is essential to create excellent wetting substances for oil–water separation due to the distinct interphase attractions of water and oil in wetting materials. Considering this, here we report a strategy of deposition of candle soot and polystyrene layers using dip-coating to develop a superhydrophobic surface on stainless steel mesh. The modified superhydrophobic stainless-steel mesh can be seen with a contact angle of water at 165° and a contact angle of oil is 0°. This mesh shows micro- and nanoscale folds, improving superhydrophobicity. It successfully separates different oils such as coconut oil, rapeseed oil, kerosene, diesel and petrol. This indicates effective oil–water separation. For low viscous oils, it seems to be more than 99% and for high viscous oils, it seems just 89% efficient. The mechanical strength of stainless-steel mesh was tested using sandpaper rubbing tests, twisting, adhesive tape testing, bending, etc It also demonstrated excellent self-cleaning properties and thermal stability. This mesh has shown different applications. Hence, these advantageous meshes are capable of large-scale industrial use, particularly in the crucial oil and water separation area.
Study of Acoustical Properties of Lead Oxide Nanoparticle in Different Solvent Mixtures at 305 K by Using Nanofluid Interferometer Avinash A. Ramteke, Pradnya K. Chougule, Neeraj Prasad, Yogesh K. Vyawahare, Shivaji R. Kulal, Amit R. Yaul Macromolecular Symposia, 2021 Abstract In the present paper, study the acoustical properties of lead oxide nanoparticles through the measurement of ultrasonic velocity and density of lead oxide nanoparticles as a ligand in 70% dioxane + water, 70% methanol + water, and 70% ethanol + water mixtures‐based solutions has been carried out, this measurement is important for understanding the particle–particle, particle–solvent, and molecular interaction. The reported nanoparticles of lead oxide by using biological method such as using plant extract, but their acoustical properties of lead oxide nanoparticles are attracted the attentions of many researchers. Hence, the present investigation is focused on the study of acoustical parameters of lead oxide nanoparticles like adiabatic compressibility (β), acoustic impedance (Z), free length, and relative association by using the nanofluid interferometer. These measurements are carried out at frequency 2 MHz and temperature 305 K (at room temperature). The obtained results are helped to observe the behavior of ultrasonic velocity and acoustic properties at different concentrations range of ligand (i.e., lead oxide nanoparticle) such as 0.01, 0.05, 0.10, and 0.15 mol dm −3 reveal the presence of interaction between particle–particle, particle and solvent.
Superhydrophobic Nanocomposite Coatings of Hydrophobic Silica NPs and Poly(methyl methacrylate) with Notable Self-Cleaning Ability Rajaram S. Sutar, Sima S. Gaikwad, Sanjay S. Latthe, Vishnu S. Kodag, S. B. Deshmukh, L. P. Saptal, S. R. Kulal, Appasaheb K. Bhosale Macromolecular Symposia, 2020 Abstract The present paper describes a facile and inexpensive dip coating method for preparation of hierarchical superhydrophobic nanocomposite coating. The hydrophobic silica nanoparticles (NPs) are synthesized via sol–gel technique. The superhydrophobicity of the coating is controlled by adjusting the concentration of silica NPs in poly (methyl methacrylate) (PMMA). After optimization, the coating exhibited water contact angle of 165° and sliding angle of 4°. The surface morphology of the superhydrophobic coatings revealed hierarchical rough structure formed on the glass substrate, which enable air trapping. The prepared superhydrophobic coating showed wetting stability under water jet impact with notable self‐cleaning performance. The mechanical stability of the superhydrophobic coating is studied using sandpaper abrasion and adhesive tape peeling test. Such highly non‐wettable and self‐cleaning coatings have potential in various practical applications.
Superhydrophobic Coating Using TiO2 NPs/PMHS Composite for Self-Cleaning Application Rajaram S. Sutar, Shriram D. Manadeshi, Sanjay S. Latthe, S. R. Kulal, G. D. Salunkhe, K. K. Rangar, R. A. Lavate, S. B. Raut, A.C. Sapkal, Appasaheb K. Bhosale, Kishor Kumar Sadasivuni, Shanhu Liu, Ruimin Xing Macromolecular Symposia, 2020 Abstract In the present research work, spray deposition technique is adopted for the fabrication of superhydrophobic coating on glass slide using TiO 2 nanoparticles and polymethylhydrosyloxane (PMHS) composite. The prepared superhydrophobic coating revealed hierarchical surface morphology due to different micro and nanoscaled grains of TiO 2 NPs/PMHS composite. The water drops hardly stay on the superhydrophobic coating and roll off the surface at sliding angle of 6° due to high water contact angle of 163 ± 2°. As a result, the prepared superhydrophobic coating revealed excellent self‐cleaning performance. To evaluate the mechanical durability the prepared superhydrophobic coating, the coating surface is exposed to water jet, water drop impact, adhesive tape peeling, and sandpaper abrasion tests. This coating approach can be applied to the substrates of any size and shape.
Synthesis and Characterization of (BaSr)PbTiO3 Material Compositions Sukhadeo N. Tambe, Shivaji R. Kulal, Shrikant R. Kokare, Dadasaheb J. Salunkhe Macromolecular Symposia, 2019 Abstract The ferroelectric composition Ba 0.8− x Sr x Pb 0.2 TiO 3 (BSPT x ) with x = 0.2–0.4 are synthesized using ceramic route of synthesis. From XRD, it is observed that with an increase in x , the c / a ratio decreases. From the observations of variation of dielectric constant ɛ with temperature, it is revealed that for x = 0.3 and 0.2, the BSPT x shows a relaxor behavior. On the other hand, for all other compositions, the phase transition is a diffused phase transition (DPT). For x = 0.3 and 0.2, the variation of Curie temperature ( Tc ) with frequency obeys the Vogel–Fulchar relation. The present observations suggest that the BSPT x could be a useful ferroelectric system.
Auto-combustion synthesis of nanocrystalline FeCrO3 S. M. Khetre, A. U. Chopade, H. V. Jadhav, S. R. Kulal, P. N. Jagadale, S. V. Bangale, S. R. Bamane 2011 International Conference on Nanoscience Technology and Societal Implications Nstsi11, 2011
