Durability of Lubricated Icephobic Coatings under Various Environmental Stresses

Icephobic coatings interest various industries facing icing problems. However, their durability represents a current limitation in real applications. Therefore, understanding the degradation of coatings under various environmental stresses is necessary for further coating development. Here, lubricated icephobic coatings were fabricated using a flame spray method with hybrid feedstock injection. Low-density polyethylene represented the main coating component. Two additives, namely fully hydrogenated cottonseed oil and paraffinic wax, were added to the coating structure to enhance coating icephobicity. Coating properties were characterised, including topography, surface roughness, thermal properties, wettability, and icephobicity. Moreover, their performance was investigated under various environmental stresses, such as repeated icing/deicing cycles, immersion in corrosive media, and exposure to ultraviolet (UV) irradiation. According to the results, all coatings exhibited medium-low ice adhesion, with slightly more stable icephobic behaviour for cottonseed oil-based coatings over the icing/deicing cycles. Surface roughness slightly increased, and wetting performances decreased after the cyclic tests, but chemical changes were not revealed. Moreover, coatings demonstrated good chemical resistance in selected corrosive media, with better performance for paraffin-based coatings. However, a slight decrease in hydrophobicity was detected due to surface structural changes. Finally, paraffin-based coatings showed better resistance under UV irradiation based on carbonyl index and colour change measurements.

Simulation of Thermoplastic Powder Cold Spraying

The work is devoted to the deposition of composite powder materials by cold spray method. As a spraying material, a thermoplastic compound «WAY» for marking the roadway was used. An asphalt concrete was used as a substrate. As a result of experimental studies, the dependence of the deposition efficiency on the stagnation temperature of the working air in the ejector nozzle was obtained. The ANSYS Fluent package was used for evaluative modeling of the cold spraying process. Gas flow patterns were obtained in the computational domain without particles and taking into account the interaction of the flow with particles. The trajectory of the particles was calculated for various spraying parameters

The Spread of Corrosion of the Deposited Material Using the Cold Spray Method

A layer of copper was applied to the base aluminum material using the cold spray method (cold kinetic deposition). The samples were exposed to corrosion in a salt chamber for 100, 200 and 300 hours. The change in the size of the internal and surface resistance of the samples was monitored. The corrosion results were also examined using an electron microscope.

Nevus Lipomatosus Cutaneous Superficialis with a Histopathological Appearance Resembling Sclerotic Fibroma: A Rare Case Report

Background: Nevus lipomatosus cutaneous superficialis (NLCS) of Hoffmann–Zurhelle is a benign idiopathic hamartoma. There are two types of NLCS, multiple and solitary. They are found in the abdomen, lower back, buttocks, hips, upper posterior thighs, and pelvis. The diagnosis can be evaluated with a typical histopathological of mature fat cells in the dermis, with 10%–50% of the dermis. Case Report: We reported a case of NLCS with clinical papules and multiple nodules on the buttocks since the age of 6 years with a history of lipoma removal. The dermoscopic examination was conducted to confirm the diagnosis. The histopathological examination showed a dominant sclerotic fibroma with two sessions of biopsy and a few mature fats on the dermis after deeper cuts paraffin block. Cryotherapy with an open spray method is treatment of choice in this patient. Discussion: The appearance of the dermis in NLCS can be normal or an increase in collagen. Interestingly, collagen has sclerosis partially and resembles sclerotic fibroma never been reported. NLCS increases the amount of collagen; however, collagen as sclerosis remains obscure. The features of NLCS histopathological with other morphological abnormalities in the dermis have been reported, such as NLCS with perifollicular fibroma (PF) features. The sclerotic fibroma features are other morphological abnormalities in NLCS, as reported in the PF.