Adsorptive properties and on-demand magnetic response of lignin@Fe₃O₄ nanoparticles at castor oil–water interfaces

Abstract

Lignin@Fe3O4 nanoparticles adsorb at oil–water interfaces, form Pickering emulsions, induce on-demand magnetic responses to break emulsions, and can sequester oil from water.

Experimental Thermal Conductivity Studies of Agar-Based Aqueous Suspensions with Lignin Magnetic Nanocomposites

“…The Fe 3 O 4 nanoparticles were encapsulated with Kraft lignin solubilized in 1 wt% ammonium hydroxide to produce a 3:1 w:w ratio of lignin@Fe 3 O 4 nanoparticles. The detailed procedure to synthesize lignin@Fe 3 O 4 nanoparticles has been reported in our previous publications [33][34][35], and a summary of the procedure can be found in the supplementary materials.…”

“…This is because of the dispersant nature of lignin in many industrial and laboratory-scale applications [31,36]. Recently, we demonstrated the adsorptive and magnetic response of lignin:Fe 3 O 4 at a mass ratio of 3:1 [33]. Hence, we used the same ratio for analyzing the thermal conductivity enhancement caused by introducing lignin@Fe 3 O 4 into agar-based suspensions in this study.…”

Controllable Regulation of Diesel Oil-in-Water Pickering Emulsion Stability by Multiresponsive Recyclable Magnetic Polymer Brush Microvessels

“…The organic polymer chain segments were combined with inorganic material substrates to prepare composite microspheres with specialized amphiphilic structures, which could be used as environmentally responsive particle emulsifiers. Currently, stimulus-responsive nanoparticle emulsifiers have been reported as pH, thermal, photographic, CO 2 /N 2 , magnetism, thermal/pH, thermal/CO 2 , pH/photographic, etc. Xi et al reported that a layer of pure sodium caseinate (NaCas) coated on the surface of bare SiO 2 particles was used to prepare hybrid nanoparticles with pH-responsive properties as Pickering emulsifiers, and the emulsion steady state changes were investigated under different pH environments .…”

Multi-responsive Pickering emulsifiers: a comprehensive study on the emulsification–demulsification behavior of modified chitosan-coated Fe3O4 nanocomposites

“…5 Fortunately, modifying stimulus-responsive groups on NPs enables emulsification and demulsification processes upon stimulation, which effectively addresses the aforementioned issues. 6,7 Currently, several types of stimulus-responsive emulsifiers have been reported, including pH-responsive, [8][9][10] temperature-responsive, [11][12][13] CO 2 -responsive, [14][15][16] light-responsive, 17,18 mechanical-responsive, 19 magnetic-responsive, [20][21][22] REDOX-responsive 23,24 and multi-responsive. Among them, magnetic responsive emulsions have garnered widespread attention due to their advantages of low toxicity, simple operation, fast response speed, high reusability, and excellent controllability.…”