ZINC STEARATE 166 & 167

Banski, Mateusz, et al. Chemistry of Materials 27.11 (2015): 3797-3800.

There are three solution-based methods for preparing semiconductor nanocrystals (NC): thermal injection, chemical reduction, and heating methods. It has been reported that the activation of zinc stearate (ZnSt₂) by alkylamines is crucial for the synthesis of NCs.
The typical synthetic procedure for ZnSe NCs is as follows: Load ZnSt₂ (0.4 mmol), Se (0.4 mmol), and 26 ml of 1-octadecene (ODE) into a 100 mL three-neck flask and degas at room temperature. Under N₂, raise the solution temperature to 295 °C. After 1 hour, cool the reaction rapidly by blowing air into the flask and add an excess of acetone to precipitate the NCs. For purification, disperse the NCs in toluene and then centrifuge to remove any insoluble residues. To clean the NC surfaces, wash the residues three times with methanol and then re-disperse them in toluene for further characterization.

Lanzón, Marcos, et al. Construction and Building Materials 139 (2017): 114-122.

Erosion data (0.01-0.05%) confirmed the exceptional efficacy of zinc stearate. There is a linear correlation between the amount of zinc stearate and erosion. The slope (dashed line) indicates that acid rain erosion is approximately 4.5 times that of regular rainwater. In summary, the tests affirmed that zinc stearate effectively reduces the degradation of earthen materials exposed to rainwater or acid rain. The waterproof properties of zinc stearate can be attributed to the hydrophobicity of its long hydrocarbon chain -C₁₈H₃₅O₂. These chains are composed entirely of repeating non-polar C-C and C-H bonds, forming a highly hydrophobic structure. In water tests, droplets falling on the sample surface rolled off, demonstrating high hydrophobic behavior similar to that observed in superhydrophobic coatings.

Parsaie, Aliasghar, et al. Colloids and Surfaces A: Physicochemical and Engineering Aspects 618 (2021): 126395.

In the context of risk management for hazardous accidental spills during oil production and transportation, sponge absorbents have recently garnered widespread attention. They are one of the most effective techniques for oil spill cleanup, capable of aggregating oil in the bulk medium and effectively removing petroleum pollutants. A novel superhydrophobic/superoleophilic sponge absorbent has been developed. It consists of a polyurethane sponge coated with zinc stearate and phenolic resin via a dip-coating method, providing the necessary surface roughness and chemical hydrophobicity.
Preparation of Superhydrophobic/Superoleophilic Coated Sponges
First, dissolve 10 grams of phenolic resin (PFR) in 100 milliliters of acetone and stir for 30 minutes to obtain a stable adhesive solution. Clean the original polyurethane sponge sequentially in ethanol, acetone, and water, each for 5 minutes, under ultrasonic conditions. Immerse the cleaned polyurethane sponge sheets in the phenolic resin adhesive solution for 15 minutes to make the sponge surface tacky. Subsequently, immerse the tacky sponge in a zinc stearate suspension (5 wt%) for 20 minutes to obtain the coated superhydrophobic polyurethane sponge. Finally, place the coated sponge sheets in a vacuum drying oven and dry at 110 °C for 80 minutes.