Study on Anti-Freezing Performance of Organic Fluorine Siloxane Nano Coating

Traditional superhydrophobic material use depends on two processes: creating a rough structure on a material surface and modifying the rough surface with low surface energy materials.

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Towards a Long-Chain Perfluoroalkyl Replacement: Water and Oil Repellent Perfluoropolyether-Based Polyurethane Oligomers

Polymers ◽

10.3390/polym13071128 ◽

2021 ◽

Vol 13 (7) ◽

pp. 1128

Author(s):

Liying Wei ◽

Tugba D. Caliskan ◽

Philip J. Brown ◽

Igor Luzinov

Keyword(s):

Surface Energy ◽

Film Surface ◽

Energy Materials ◽

Low Surface Energy ◽

One Step ◽

Pet Film ◽

Oil Repellent ◽

Macromolecular Architecture ◽

End Group ◽

Long Chain

Original perfluoropolyether (PFPE)-based oligomeric polyurethanes (FOPUs) with different macromolecular architecture were synthesized (in one step) as low-surface-energy materials. It is demonstrated that the oligomers, especially the ones terminated with CF3 moieties, can be employed as safer replacements to long-chain perfluoroalkyl substances/additives. The FOPU macromolecules, when added to an engineering thermoplastic (polyethylene terephthalate, PET) film, readily migrate to the film surface and bring significant water and oil repellency to the thermoplastic boundary. The best performing FOPU/PET films have reached the level of oil wettability and surface energy significantly lower than that of polytetrafluoroethylene, a fully perfluorinated polymer. Specifically, the highest level of the repellency is observed with an oligomeric additive, which was made using aromatic diisocyanate as a comonomer and has CF3 end-group. This semicrystalline oligomer has a glass transition temperature (Tg) well above room temperature, and we associate the superiority of the material in achieving low water and oil wettability with its ability to effectively retain CF3 and CF2 moieties in contact with the test wetting liquids.

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Improving the Mechanical Durability of Superhydrophobic Coating by Deposition on to a Mesh Structure

10.26434/chemrxiv.5356327.v1 ◽

2017 ◽

Author(s):

Weihua Hu ◽

De-Quan Yang ◽

Edward Sacher

Keyword(s):

Surface Energy ◽

Superhydrophobic Surface ◽

Impact Resistance ◽

Superhydrophobic Surfaces ◽

Superhydrophobic Coating ◽

Mesh Structure ◽

Mechanical Abrasion ◽

Low Surface Energy ◽

Jet Impact ◽

Mechanical Durability

<p>Superhydrophobic surfaces (SHSs) require a combination of a rough nano- or microscale structured surface topography and a low surface energy. However, its superydrophobicity is easily lost, even under relatively mild mechanical abrasion, when the surface is mechanically weak. Here, we develop a method that significantly increases the mechanical durability of a superhydrophobic surface, by introducing a mesh layer beneath the superhydrophobic layer. The hardness, abrasion distance, flexibility and water-jet impact resistance all increase for the commercially available Ultra-ever Dry superhydrophobic coating. This is attributed to the increased mechanical durability offered by the mesh, whose construction not only increases the porosity of the SHS coating but acts as a third, larger structure, so that the superhydrophobic layer is now composed of a three-level hierarchical structure: the mesh, micropillars and nanoparticles.</p>

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Improving the Mechanical Durability of Superhydrophobic Coating by Deposition on to a Mesh Structure

10.26434/chemrxiv.5356327 ◽

2017 ◽

Author(s):

Weihua Hu ◽

De-Quan Yang ◽

Edward Sacher

Keyword(s):

Surface Energy ◽

Superhydrophobic Surface ◽

Impact Resistance ◽

Superhydrophobic Surfaces ◽

Superhydrophobic Coating ◽

Mesh Structure ◽

Mechanical Abrasion ◽

Low Surface Energy ◽

Jet Impact ◽

Mechanical Durability

<p>Superhydrophobic surfaces (SHSs) require a combination of a rough nano- or microscale structured surface topography and a low surface energy. However, its superydrophobicity is easily lost, even under relatively mild mechanical abrasion, when the surface is mechanically weak. Here, we develop a method that significantly increases the mechanical durability of a superhydrophobic surface, by introducing a mesh layer beneath the superhydrophobic layer. The hardness, abrasion distance, flexibility and water-jet impact resistance all increase for the commercially available Ultra-ever Dry superhydrophobic coating. This is attributed to the increased mechanical durability offered by the mesh, whose construction not only increases the porosity of the SHS coating but acts as a third, larger structure, so that the superhydrophobic layer is now composed of a three-level hierarchical structure: the mesh, micropillars and nanoparticles.</p>

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Cytocompatibility of Carbon Nanofiber Materials for Neural Applications

MRS Proceedings ◽

10.1557/proc-774-o7.35 ◽

2003 ◽

Vol 774 ◽

Author(s):

Janice L. McKenzie ◽

Michael C. Waid ◽

Riyi Shi ◽

Thomas J. Webster

Keyword(s):

Carbon Fiber ◽

Surface Energy ◽

Carbon Nanofibers ◽

Carbon Fibers ◽

Carbon Nanofiber ◽

Fiber Composite ◽

Scar Tissue ◽

Pc 12 Cells ◽

Low Surface Energy ◽

Poly Carbonate

AbstractSince the cytocompatibility of carbon nanofibers with respect to neural applications remains largely uninvestigated, the objective of the present in vitro study was to determine cytocompatibility properties of formulations containing carbon nanofibers. Carbon fiber substrates were prepared from four different types of carbon fibers, two with nanoscale diameters (nanophase, or less than or equal to 100 nm) and two with conventional diameters (or greater than 200 nm). Within these two categories, both a high and a low surface energy fiber were investigated and tested. Astrocytes (glial scar tissue-forming cells) and pheochromocytoma cells (PC-12; neuronal-like cells) were seeded separately onto the substrates. Results provided the first evidence that astrocytes preferentially adhered on the carbon fiber that had the largest diameter and the lowest surface energy. PC-12 cells exhibited the most neurites on the carbon fiber with nanodimensions and low surface energy. These results may indicate that PC-12 cells prefer nanoscale carbon fibers while astrocytes prefer conventional scale fibers. A composite was formed from poly-carbonate urethane and the 60 nm carbon fiber. Composite substrates were thus formed using different weight percentages of this fiber in the polymer matrix. Increased astrocyte adherence and PC-12 neurite density corresponded to decreasing amounts of the carbon nanofibers in the poly-carbonate urethane matrices. Controlling carbon fiber diameter may be an approach for increasing implant contact with neurons and decreasing scar tissue formation.

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Selection of Wear Resistive Nano coating in En8 Steel

Bulletin of Scientific Research ◽

10.34256/bsr1929 ◽

2019 ◽

Vol 1 (2) ◽

pp. 73-80

Author(s):

Ilangkumaran M ◽

Tiruvenkadam N ◽

Saranya M ◽

Thulsidharan R

Keyword(s):

Mild Steel ◽

Mechanical Action ◽

Medium Carbon Steel ◽

Solid Surfaces ◽

Material Surface ◽

Multi Criteria Decision Making ◽

Sliding Surface ◽

Medium Carbon ◽

Nano Coating ◽

Selection Of

Where is the abrasive or gradual removal of materials at solid surfaces? It is caused due to the interaction between the sliding surface by mechanical action. The abrasive wears can be recognised as scratches or grooves. To enhance the wear resistance suitable nanocoating is applied on the material surface for better tribological properties such as hardness and toughness. Wear resistant nanocoating is used to reduce or eradicate wear to extend the lifetime of the EN8 steel. EN8 is unalloyed medium carbon steel with better mechanical properties than mild steel and also readily machinable in any condition. The nanocoating materials such as Al2O3, TiO2, SiC, ZrO2, WS2, Si3N4 etc., are used to reduce wear and to enhance hardness and toughness on mild steel through various nanocoating techniques. This paper deals with selection of suitable nanocoating material through AHP (Analytical hierarchal process) - a multi-criteria decision-making method.

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Corrigendum to “Fabrication superhydrophobic composite membranes with hierarchical geometries and low-surface-energy modifications” [Polymer 211 (2020) 123097]

Polymer ◽

10.1016/j.polymer.2021.123481 ◽

2021 ◽

Vol 217 ◽

pp. 123481

Author(s):

Zhanhui Gan ◽

Deyu Kong ◽

Qianqian Yu ◽

Yifan Jia ◽

Xue-Hui Dong ◽

...

Keyword(s):

Surface Energy ◽

Composite Membranes ◽

Low Surface Energy

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Automated pick-and-place of single nanoparticle using electrically controlled low-surface energy nanotweezer

AIP Advances ◽

10.1063/5.0041145 ◽

2021 ◽

Vol 11 (3) ◽

pp. 035219

Author(s):

Ya-Kun Lyu ◽

Zuo-Tao Ji ◽

Tao He ◽

Zhenda Lu ◽

Weihua Zhang

Keyword(s):

Surface Energy ◽

Low Surface Energy ◽

Single Nanoparticle ◽

Pick And Place

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Fabrication and Evaluation of Nano-TiO2 Superhydrophobic Coating on Asphalt Pavement

Materials ◽

10.3390/ma14010211 ◽

2021 ◽

Vol 14 (1) ◽

pp. 211

Author(s):

Hongfeng Li ◽

Xiangwen Lin ◽

Hongguang Wang

Keyword(s):

Contact Angle ◽

Stearic Acid ◽

Asphalt Pavement ◽

Asphalt Mixture ◽

Waterborne Polyurethane ◽

Superhydrophobic Coating ◽

Nano Tio2 ◽

Sem Image ◽

Low Surface Energy ◽

Water Damage

In order to address water damage of asphalt pavement, reduce the occurrence of water-related potholes, deformation, and other diseases, and improve the performance and service life of the pavement, a nano-TiO2 superhydrophobic coating (PSC) on asphalt pavement was prepared from waterborne polyurethane and nano-TiO2 modified by stearic acid. FT-IR measured stearic acid successfully modified low surface energy substance on the surface of nano-TiO2. The SEM image shows that the PSC has a rough surface structure. The contact angle and rolling angle of the PSC in the contact angle test are 153.5° and 4.7°, respectively. PSC has a super-hydrophobic ability, which can improve the water stability of the asphalt mixture. Although the texture depth and pendulum value have been reduced by 2.5% and 4.4%, respectively, they all comply with the standard requirements. After the abrasion resistance test, the PSC coating still has a certain hydrophobic ability. These results surface PSC coating can effectively reduce water damage on asphalt pavement, and has considerable application value.

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