Tribological and Lubrication Properties of Sandblast-Textured Surfaces with Varied Roughness

Wang, Yan Qing; Yang, Hai; Han, Qiang; Fang, Liang; Ge, Shi Rong

doi:10.4028/www.scientific.net/amr.154-155.1019

Cited by 17 publications

(13 citation statements)

References 14 publications

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“…Wettability plays a key role in various industrial applications (e.g., material dispersion and interfacial chemistry). In particular, it significantly affects the coating industry, which includes nano engineering, ink, paint, paste, and adhesives; as well as the compound industry, which includes extrusion, injection molding, and casting [8][9][10][11][12][13]. Surface energy is the energy created by surface atoms, and is the result of the force of attraction they exert on external materials.…”

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confidence: 99%

A simple method to determine the surface energy of graphite

Lee¹,

Lee²

2017

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Graphite is a material condensed from aromatic hydrocarbon that forms an infinite plane that exhibits an amphoteric feature. Structurally, a number of benzene rings form a solid planar sheet. A number of layers are formed from numerous unit cells, a so-called grapheme. A graphene sheet has an electron structure, which expands π-electrons into a two dimensional space. Graphite has AB-stacked bilayers of graphene. Because the interaction between two sheets is weak, their electronic structure may vary significantly. In addition, because graphite has either zero-semiconductor electronic structures, or a semi-metal electronic structure, its ionization energy is 4 eV [1] and it has dual electronic characteristics. Thus, it may work as either an oxidizer or reducer. In particular, the shape of the graphite plays an important role in its mechanical characterization [2]. Graphene, in its role as a unit cell of graphite, is known to have great potential for applications in many fields [3]. It is critical to understand graphite's interfacial interaction with a matrix, or its wettability, when applying its electrically and thermally conductive properties to characteristic composites.In this study, we proposed a simple method by which to determine the surface energy of graphene to expand graphite applications and to understand better the interfacial interaction of various matrices. This will explain why strong acids (e.g., sulfuric acid and nitric acid [4][5][6][7]) are employed for graphene or graphene oxide synthesis. In order to implement these kinds of experiments, repetitive work and trial-and-error are unavoidable. However, if we are able to understand the surface energy of graphite, we can save time and effort as well as facilitate systematic approaches by which we can choose appropriate solvents and chemicals.The surface energy could be represented in terms of wettability and contact angles. Wettability plays a key role in various industrial applications (e.g., material dispersion and interfacial chemistry). In particular, it significantly affects the coating industry, which includes nano engineering, ink, paint, paste, and adhesives; as well as the compound industry, which includes extrusion, injection molding, and casting [8][9][10][11][12][13]. Surface energy is the energy created by surface atoms, and is the result of the force of attraction they exert on external materials. Higher surface energy promotes greater liquid wettability. Therefore, the higher the surface energy is, the more enhanced the wettability, and the smaller the contact angle, becomes. As a result, knowing the droplet contact angle will determine the corresponding surface energy. The density of surface energy for water is 72 mJ/m 2 and its surface tension is 72 mN/m. Their values are the same. In order to measure the droplet contact angle, a planar surface and knowledge of the compact density of the given materials are required. In the case of graphite, it is difficult to acquire a planar surface. However, in this study, we report a simple meth...

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confidence: 99%

A simple method to determine the surface energy of graphite

Lee¹,

Lee²

2017

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“…As well, it used in medical applications [43][44][45][46]. The contact angle could be measured as a primary data, which gives the degree of wetting when the liquid interacts with the solid surface.…”

Section: Surface Wettabilitymentioning

confidence: 99%

Photoluminescence, optical band gap and surface wettability of some polymeric track detectors modified by electron beam

Zaki

Ghaly

El-Bahkiry

2015

Surface and Coatings Technology

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“…Wetting information is essential to many applications and processes such as petroleum oil recovery, coating and printing, lubrication, development of biocompatible surfaces, membranes, and many others (Prabhu et al 2009;Zhao et al 2010;Wang et al 2011;Sakai et al 2008;Son et al 2008;Perelaer et al 2009). In a wetting system, the contact angle is commonly used to quantify the degree of wettability of a solid surface by a liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Determination of contact angle and surface tension of nanomaterial solutions by optical contact angle system

Kennedy¹,

Wu²,

Kremer³

et al. 2019

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Contact angle and surface tension measurements reveal wetting characteristics of materials, which are very essential for both fundamental research and manufacturing processes. Among many types of techniques, optical contact angle measurement is considered to be the most convenient method and has been widely used. This scientific operating procedure (SOP) provides general guidance for using an optical contact angle measurement system (e.g., an AST VCA Optima system), for determining contact angle and surface tension of nanomaterials in solution. Procedures and recommendations for sample preparation, instrument preparation, sample analysis, and results analysis are included. This procedure was tested on a variety of nanomaterial dispersions. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.

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Tribological and Lubrication Properties of Sandblast-Textured Surfaces with Varied Roughness

Cited by 17 publications

References 14 publications

A simple method to determine the surface energy of graphite

A simple method to determine the surface energy of graphite

Photoluminescence, optical band gap and surface wettability of some polymeric track detectors modified by electron beam

Determination of contact angle and surface tension of nanomaterial solutions by optical contact angle system

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