In this research, an experiment was conducted by introducing superhydrophobic surface into rolling spheronization granulation. The employed superhydrophobic surface was prepared with modification of an anodized Cu mesh with silane FAS-17 and exhibited excellent uniformity, adequate stability, and broad adaptability in the granulation scenario. Completely spherical molecular sieve granules with 99.85% sphericity and 2.53 mm diameter were obtained. The compressive strength of a single granule reached 7.402 N/ea. Only negligible residual mass and slight surface abrasion were observed in the granulation process. Force analysis confirmed that the staged motion behavior of droplets caused by the interaction between the slurry and the superhydrophobic surface benefited to the formation of spherical granules. Successful application of this process for granulation of other substances confirmed its wide suitability. With the advantages of easy fabrication, high-quality granules, and low cost, rolling-spheronization granulation on superhydrophobic surfaces has great potential for scale-up applications.
Lotus
leaves and rose petals are both typical natural superhydrophobic
surfaces, with low and high adhesion, respectively. This fact inspires
us to prepare superhydrophobic surfaces with different levels of adhesion
on iron by mimicking their hierarchical structures through three simple
steps: abrasion, calcination, and modification. A uniform and stable
superhydrophobic iron surface with excellent adaptability and wearability
can be obtained, and its adhesion is tunable. The results confirmed
that superhydrophobicity and adhesion are both dependent on the synergy
of the microscale and nanoscale patterns of the hierarchical structure
generated by the designed abrasion and thermal treating. The adhesion
level can be controlled by simply adjusting the abrasion program to
obtain the desired microscale pattern with a proper ratio of height-to-width
of the microstructure. This easy, inexpensive, and clean three-step
method is widely applicable for different engineering metals and alloys
and suitable for large-scale production.
LiBr refrigerating systems are frequently used in industry, but the pipelines are easily corroded or blocked by the LiBr solution with high flow resistance. Here, a superhydrophobic Fe surface was proposed and tested for applicability. After constructing a rough Fe 2 O 3 nanotube array on a Fe surface by the anodization process, a superhydrophobic Fe surface was obtained by silane modification. The as-prepared superhydrophobic surface exhibited excellent repulsion to LiBr solutions. The modified Fe foil showed a 3.35% decrease in thermal conductivity but a 99.2% improvement of anticorrosion protection efficiency. LiBr crystals deposited on this surface were easily detached. The flow resistance along the superhydrophobic surface was reduced to 50% of that along a pure Fe surface. The operation temperature of the system was broadened due to low blockage risk. The excellent thermal conductivity, anticorrosivity, drag reduction, and antifouling performance of the superhydrophobic Fe surface exhibits promise for industrial application.
The complex composition in industrial pollutants includes immiscible liquid and miscible solution that present a great challenge to deal with the effluent. In this research, the interaction between super hydrophobic surface and the miscible solution is studied based on surface tension (ST) and contact angle. A superhydrophobic surface is fabricated by simple anodisation and self-assemble method. Then two different types of miscible solution are adopted to evaluate the property of the superhydrophobic surfaces. The obtained result shows that the wettability is closely related to ST of mixtures, which is controlled by the interface component. When the ST is less than 31.55 mN m −1 , the critical pressure reduced from maximum value (6442.8 Pa) to negative number. In turn, the superhydrophobic film loses its repellency and shows affinity to the mixtures. This can provide an important supplement for utilising superhydrophobic materials, especially for the oil-water separation.
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