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Liu, S., Dong, X., Sun, Y., Ye, G., & Yang, X. (2025). Separation and Purification Technology, 134144.
This study addresses the challenge of stabilizing coal froth systems during thickening and filtration, which adversely affects solid-liquid separation efficiency in coal processing. Traditional silicone oil defoamers, while effective in two-phase foam systems, show limited efficacy in the complex three-phase coal froth due to structural intricacies. To overcome this, a synergistic chemical approach combining silicone oil with sodium dodecylbenzenesulfonate (SDBS) surfactant was developed.
At optimized concentrations (3 mM silicone oil and 0.75 mM SDBS), silicone oil's defoaming capabilities were enhanced through SDBS-induced structural modifications. Adsorption of SDBS onto coal particle surfaces reduced hydrophobicity and weakened interparticle forces, decreasing the storage modulus (G') by 67%, and resulting in smaller aggregates with increased interstitial spacing. This restructuring facilitated the penetration of silicone oil droplets into bubble films, promoting efficient film rupture.
Microscopic and rheological analyses demonstrated that the combination disrupted bubble surface integrity by detaching fine particles (<8 µm), thereby enhancing dewatering efficiency. The synergistic effect resulted in complete destabilization of coal froth, significantly improving solid-liquid separation performance without compromising downstream flotation processes.
This work elucidates the dual role of silicone oil in defoaming and SDBS in structural modification, providing a mechanistic foundation for optimizing industrial chemical treatments in coal and mineral processing. The findings highlight silicone oil's critical application in overcoming the limitations of conventional defoamers within complex froth systems, thereby enabling safer, more efficient, and cost-effective dewatering operations.
Liu, Shu-Hui, et al. Journal of Power Sources 632 (2025): 236381.
This study investigates the application of silicone oil as a trace additive to overcome mass transfer limitations of gaseous hydrophobic toluene in a diffusion-packed anode bioelectrochemical system (DPA-BES). By introducing silicone oil into the system, significant improvements were observed in toluene removal efficiency (RE), mineralization efficiency (ME), and voltage output, achieving increases of 1.42, 2.29, and 1.51 times, respectively, compared to controls without silicone oil.
Systematic variation of silicone oil concentrations revealed an optimal dosage of 5%, which balanced enhanced toluene mass transfer with microbial degradation efficiency. At 5% silicone oil, the system exhibited 89% toluene removal and 75.5% mineralization, alongside a voltage output of 136.6 mV. Higher concentrations (10%) resulted in marginal improvements in RE but decreased ME due to toluene absorption and dissolution before microbial breakdown.
The presence of silicone oil notably stimulated microbial community enrichment, favoring electroactive and volatile organic compound (VOC)-degrading bacteria, including Azoarcus, Pseudomonas, Victivallis, and Flavobacterium. Additionally, co-treatment of acetone and toluene at a 1:1 ratio further optimized removal and power generation performance, confirming the synergistic effects of silicone oil in complex VOC remediation.
This work demonstrates that silicone oil effectively enhances mass transfer of hydrophobic VOCs in bioelectrochemical systems, promoting microbial degradation and electrical output, and offers a promising strategy for improving bioelectrochemical wastewater treatment efficiency.
Xu, Jingyu, Yuhong Qi, and Zhanping Zhang. Surfaces and Interfaces 56 (2025): 105725.
This study presents the application of silicone oil (SO) to improve the antifouling properties of poly(dimethyl-methylphenyl-methyltrifluoropropyl)siloxane (PDPFS) coatings, aiming for an eco-friendly marine coating without toxic substance release. Three types of silicone oils with identical viscosities-methyl silicone oil (MSO), fluorosilicone oil (FSO), and phenyl silicone oil (PSO)-were incorporated into PDPFS to form SO/PDPFS composite coatings.
The coatings were prepared by blending Component A (SO and PDPFS, with mass ratio defined as O/P), Component B (tetraethyl orthosilicate, TEOS, as crosslinker), and Component C (dibutyltin dilaurate, DBTDL, as catalyst) in a fixed ratio of 100:7.5:0.4. The SO phase separation and migration behaviors within the cured PDPFS matrix were governed by thermodynamic incompatibility and capillary-driven leaching through interfacial gaps.
Kinetic analysis revealed that MSO and PSO exhibited upward leaching, forming a lubricating oil film on the coating surface that effectively hindered marine organism adhesion and facilitated fouling removal under external forces. Conversely, FSO migrated downward, limiting its surface efficacy. Antifouling tests demonstrated superior performance of PSO/PDPFS coatings, with antifouling efficiency increasing from 23.39% to 84.89% as the O/P ratio increased.
This investigation highlights silicone oil, particularly phenyl silicone oil, as a functional additive that enhances PDPFS coating's antifouling ability by creating a dynamic surface oil film, providing a sustainable and non-toxic solution for marine biofouling control.
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