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Nanoferrite Composites:
Published in Vineet Kumar, Praveen Guleria, Nandita Dasgupta, Shivendu Ranjan, Functionalized Nanomaterials II, 2021
Jalpa A. Vara, Pragnesh N. Dave
In the laser ablation synthesis method, small-size particles are produced by the irradiation solid surface with a laser beam in liquid. The solvent can be a organic solvent or water. The preparation of an ultra-size particle takes place when diethylene glycol (DEG) is used as a liquid medium because large viscosity of solvent retards the growth of particles (Luo et al. 2013). The three main stages of this technique are: initial stage; absorption of laser energy; generation of heat waves which proliferate inside the target material and liquid. This results in material ejection and plume formation. In limiting the liquid environment, the laser column becomes bigger.
A comprehensive review of sustainable approaches for synthetic lubricant components
Published in Green Chemistry Letters and Reviews, 2023
Jessica Pichler, Rosa Maria Eder, Charlotte Besser, Lucia Pisarova, Nicole Dörr, Martina Marchetti-Deschmann, Marcella Frauscher
About 75% of polyalcohols (polyols) belong to the group of polyether polyols, whereas the remaining 25% belong to the group of polyesters and other polyols (88). The representatives of the polyol group range from the simplest ethylene glycol over diethylene glycol, triethylene glycol, and tetraethylene glycol to polyethylene glycol (89). Renewable polyols can derive from plants-based components such as carbohydrates (monosaccharides, starch), proteins, and essential oil extracts. In addition, polyols can be recollected from agro-residue or waste from households and the food processing industry, to not compete with possible food sources in the first place (90). In the lubricating industry, neopentyl polyol esters composed of a central quaternary carbon atom with attached primary alcohol methylol groups are usually used as base oils for synthetic lubricant production. This relates especially to neopentyl glycol (NPG), pentaerythritol (PE), and trimethylolpropane (TMP) (6).
Rosemary oil low energy nanoemulsion: optimization, µrheology, in silico, in vitro, and ex vivo characterization
Published in Journal of Biomaterials Science, Polymer Edition, 2022
Nupur Vasdev, Mayank Handa, Prashant Kesharwani, Rahul Shukla
Rosemary oil miscibility studies were performed by adding oil and respective solvent [Tween series: (20, 40, 60, 80), diethylene glycol monoethyl ether (DGME), ethanol, polyethylene glycol (PEG) (200, 300, 400, 600), and water] in the ratio of 1:1. In this study, 2 mL of centrifuge tube was taken, and an equivalent volume of oil and solvent was poured and vortexed for complete mixing of the solution. Observation of the resulting solution was done based on visual inspection and UV–visible spectroscopy (Agilent Carry 60) transmission analysis at 600 nm ƛmax. On the basis of visual inspection, resulting mixture was assigned as clear or transparent i.e. miscible, while translucent and biphasic as immiscible. If the UV-transmission of the resulting solution was observed to be less than 90% then the solution is considered immiscible.
Nanoscale zero valent nickel: synthesis and spectral studies of interactions with different surfactants and solvents
Published in Smart Science, 2021
In the present study, nickel nanoparticles were synthesized by modified polyol reduction methods which remain stable for several months. Formation of nickel nanoparticles was shown by UV- Vis spectroscopy. XRD studies confirm that nickel nanoparticles are amorphous in nature which assemble in FCC structure. TEM results reveal that the particles are less dispersed and small in size. The particles using ethylene glycol and diethylene glycol are below 10 nm as compared to methanol as reductant. The effects of PVP, CTAB, and SDS on particle size show that PVP supported particles are quasi-spherical with nearly homogeneous size and less discrete. Zero oxidation state of synthesized nickel nanoparticles was confirmed by XPS. The application of synthesized nickel nanoparticles in the oxidation of azo dye show good catalytic activity as compared to nickel precursor. In view of the relatively outstanding size monodispersity and minimum of agglomeration exhibited by this interesting approach, the present method can be used for the synthesis of other metallic nanoparticles (Ti, Cr, V) & their corresponding nanoscaled oxides (TiO2, Cr2O3, VO2).